i6A4W Series Datasheet

TDK-Lambda Americas Inc.

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Datasheet

Advance Data Sheet: i6A Series – 1/16
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I6A Series DC/DC Power Modules
9-53V Input, 20A Output
250W 1/16
th
Brick Power Module
I6A4W power modules perform local voltage conversion
from a 12V, 24V, or well regulated 48V bus. The
i6A4W series utilizes a low component count that results
in both a low cost structure and a high level of
performance. The open-frame, compact, design
features a low profile and weight that allow for extremely
flexible and robust manufacturing processes. The ultra-
high efficiency allows for a high amount of usable power
even in demanding thermal environments.
Features
Size – 33mm x 22.9 mm x 12.7 mm
(1.3 in. x 0.9 in. x 0.5 in.)
Maximum weight 15g (0.53 oz)
Thru-hole pins 3.68mm (0.145”)
Industry standard 1/16
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factor
Up to 250W of output power in high
ambient temperature, low airflow
environments with minimal power
derating
Wide output voltage adjustment
range (3.3V – 40V)
Negative logic on/off
Optimized dynamic voltage
response with minimal external
capacitors
Low noise
Constant switching frequency
Remote Sense
Full, auto-recovery protection:
o Input under voltage
o Short circuit
o Thermal limit
ISO Certified manufacturing facilities
Optional Features
Positive logic on/off
Power Good
Frequency Synchronization
Output voltage sequencing
Short 2.79mm (0.110”) pin length
Long 4.57mm (0.180”) pin length
Applications
Contact technical support for
applications requiring constant
current operation
Advance Data Sheet: i6A Series – 1/16
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Ordering Information:
Product
Identifier
Package Size
Platform
Input
Voltage
Output
Current
Units
Main
Output
Voltage
# of
Outputs
Safety
Class
Feature Set
RoHS
Indicator
i 6 A 4W 020 A 033 V -
0 01 -
R
TDK
Lambda
33mm x
22.9mm I6A
9V to
53V
010 - 10
020 - 20
Amps 3.3V
Single
See option
table
R=RoHS 6
Compliant
Option Table:
Feature Set Positive
Logic On/Off
Negative
Logic On/Off
Full Feature
(PGood, Sync, Seq)
Enhanced
Feature
(Pgood, Sync)
0.145”
Pin
Length
0.1
80
Pin
Length
-000 X X
-001 X X
-002 X X X
-003 X X X
-005 X X X
-007 X X
-009 X X X
Product Offering:
Code Input Voltage Output Voltage Output Current Maximum
Output Power Efficiency
I6A4W020A033V 9V-53V 3.3V-15V 20A 250W 97%
I6A4W010A033V 9V-53V 3.3V-40V 10A 250W 97%
3320 Matrix Drive, Suite 100
Richardson, TX 75082
Phone (800)526-2324 Toll Free
(214)347-5869
Lambda.TechSupport@us.tdk-lambda.com
http://www.TDK-Lambda.com/
Advance Data Sheet: i6A Series – 1/16
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Mechanical Specification:
Dimensions are in mm [in]. Unless otherwise specified tolerances are: x.x ± 0.5 [0.02], x.xx ± 0.25 [0.010
]
33.0 [1.30]
22.9 [0.90]
12.1 [0.474]
3.7 [0.14]
1.3 [0.05]
1.3 [0.05]
Pin 1
Chamfer
1.57 [0.062] DIA Pins
2.59 [0.102] DIA Stand-offs
2 Places
MAX
1.02 [0.040] DIA Pins
1.78 [0.070] DIA Stand-offs
up to 9 Places 4.6 [0.18] Optional Pin Length
Advance Data Sheet: i6A Series – 1/16
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Recommended Hole Pattern Standard (top view):
Recommended Hole Pattern - Full Feature (top view):
Pin base material is brass or copper with gold over nickel plating; the maximum module weight is 15g (0.53 oz).
Pin1
Pin3
Pin2
Pin4
Pin7
Pin8
Pin6
2.5 [0.10]
27.9 [1.100]
2.5 [0.10]
15.2 [0.600]
33.0 [1.30]
22.9 [0.90]
3.8 [0.15]
3.8 [0.150]
7.6 [0.300] 15.2 [0.600]
7.6 [0.300]
3.8 [0.15]
Pin1
Pin34
Pin3
Pin2
Pin5
Pin4
Pin7
Pin8
Pin6
Pin33
Pin32
2.5 [0.10]
27.9 [1.100]
2.5 [0.10]
15.2 [0.600]
33.0 [1.30]
22.9 [0.90]
20.3 [0.800]
24.1 [0.950]
2.5 [0.10]
3.8 [0.15]
3.8 [0.150]
7.6 [0.300]
11.4 [0.450]
15.2 [0.600]
3.8 [0.150]
7.6 [0.300]
3.8 [0.15]
PIN
FUNCTION
PIN
FUNCTION
1
Vin (+)
7
SENSE +
2
On/Off
8
Vout (+)
3
Vin (
-
)
/
GND
32
Sync
(option)
4
Vout (
-
)
/
GND
33
MS
(option)
5
Power
Good
(option)
34
Sequence
(option)
6
TRIM
Pin Assignment:
Advance Data Sheet: i6A Series – 1/16
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Absolute Maximum Ratings:
Stress in excess of Absolute Maximum Ratings may cause permanent damage to the device.
* Engineering estimate
Input Characteristics:
Unless otherwise specified, specifications apply over all rated Input Voltage, Resistive Load, and Temperature conditions.
Characteristic
Min
Typ
Max
Unit
Notes & Conditions
Operating Input Voltage 10 --- 53 Vdc Vin > Vo
Maximum Input Current --- --- 20 A Vin= Vin,min to Vin,max; Io=Io,max
Startup Delay Time from application of input voltage --- 4 --- mS Vo=0 to 0.1*Vo,set; on/off=on,
Io=Io,max, Tc=25˚C
Startup Delay Time from on/off --- 3 --- mS Vo=0 to 0.1*Vo,set; Vin=Vi,nom,
Io=Io,max,Tc=25˚C
Output Voltage Rise Time --- 10 --- mS Io=Io,max,Tc=25˚C, Vo=0.1 to
0.9*Vo,set
Input Ripple Rejection --- 50* --- dB @ 120 Hz
Turn on input voltage --- 8 --- V
Turn off input voltage --- 7 9 V
*Engineering Estimate
Caution: The power modules are not internally fused. An external input line normal blow fuse with a
maximum value of 30A is required, see the Safety Considerations section of the data sheet.
Characteristic
Min
Max
Unit
Notes & Conditions
Continuous Input Voltage -0.25 55 Vdc
Isolation Voltage --- --- Vdc None
Storage Temperature -55 125 ˚C
Operating Temperature Range (Tc) -40 125* ˚C Measured at the location specified in the thermal
measurement figure; maximum temperature varies
with output current – see curve in the thermal
performance section of the data sheet.
Advance Data Sheet: i6A Series – 1/16
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Electrical Data: I6A4W020A033V
Characteristic
Min
Typ
Max
Unit
Notes & Conditions
Output Voltage Initial Setpoint
-2 - +2 %
Vo=3.3Vsetting, Vin=Vin,nom; Io=Io,min; Tc
= 25˚C
Output Voltage Tolerance
-4 - +4 %
Over all rated input voltage, load, and
temperature conditions to end of life
Efficiency Vo = 5V
Vo = 9V
---
---
95
97
---
---
%
%
Vin=12V; Io=Io,max; Tc=25˚C
Efficiency Vo = 5V
Vo = 12V
---
---
93
97
---
---
%
%
Vin=24V; Io=Io,max; Tc=25˚C
Efficiency Vo = 5V
Vo = 12V
---
---
90
95
---
---
%
%
Vin=48V; Io=Io,max; Tc=25˚C
Line Regulation --- 0.4 --- % Vin=Vin,min to Vin,max
Load Regulation --- 1.2 --- % Io=Io,min to Io,max
Output Current 0 --- 20 A Observe maximum power limit
Output Current Limiting Threshold
--- 27 --- A Vo = 0.9*Vo,nom, Tc<Tc,max
Short Circuit Current
--- 0.5 --- A Vo = 0.25V, Tc = 25˚C
Output Ripple and Noise Voltage
--- 20 --- mVpp
Measured across one 0.1 uF ceramic
capacitor and one 22uF ceramic capacitor –
see input/output ripple measurement figure;
BW = 20MHz.
Output Voltage Adjustment Range 3.3 --- 15 V
Output Voltage Sense Range --- --- 5 %
Dynamic Response:
Recovery Time
Transient Voltage
---
---
80
500
---
---
uS
mV
di/dt =1A/uS, Vin=Vin,nom; Vo=12V, load
step from 25% to 75% of Io,max
Switching Frequency --- 400 --- kHz Fixed
External Load Capacitance 0 --- 1500* uF 200uF minimum recommended when output
voltage is 8V or higher
Vref --- 0.6 --- V Required for trim calculation
Vonom --- 2.59 --- V Required for trim calculation
F --- 36500 --- Required for trim calculation
G --- 511 --- Required for trim calculation
*Please contact TDK Lambda for technical support for very low esr capacitor banks or if higher capacitance is required
Advance Data Sheet: i6A Series – 1/16
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Electrical Characteristics: I6A4W020A033V
Typical Efficiency vs. Input Voltage
70
75
80
85
90
95
100
0 1.7 3.4 5.1 6.8 8.5 10.2 11.9 13.6 15.3 17
Efficiency, h(%)
Output Current (A)
Vin = 18V Vin = 24V Vin = 48V
70
75
80
85
90
95
100
0 2 4 6 8 10 12 14 16 18 20
Efficiency, h(%)
Output Current (A)
Vin = 15V Vin = 24V Vin = 48V
Vo = 15V Vo = 12V
70
75
80
85
90
95
100
0 2 4 6 8 10 12 14 16 18 20
Efficiency, h(%)
Output Current (A)
Vin = 12V Vin = 24V Vin = 48V
70
75
80
85
90
95
100
0 2 4 6 8 10 12 14 16 18 20
Efficiency, h(%)
Output Current (A)
Vin = 12V Vin = 24V Vin = 48V
Vo = 9V Vo = 5V
70
75
80
85
90
95
100
0 2 4 6 8 10 12 14 16 18 20
Efficiency, h(%)
Output Current (A)
Vin = 12V Vin = 24V Vin = 48V
Intentionally blank
Vo=3.3V
Advance Data Sheet: i6A Series – 1/16
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Electrical Characteristics: I6A4W020A033V
Typical Power Dissipation vs. Input Voltage
0
2
4
6
8
10
12
0 1.7 3.4 5.1 6.8 8.5 10.2 11.9 13.6 15.3 17
Power Dissipation (W)
Output Current (A)
Vin = 18V Vin = 24V Vin = 48V
0
5
10
15
0 2 4 6 8 10 12 14 16 18 20
Power Dissipation (W)
Output Current (A)
Vin = 15V Vin = 24V Vin = 48V
Vo=15V Vo=12V
0
5
10
15
0 2 4 6 8 10 12 14 16 18 20
Power Dissipation (W)
Output Current (A)
Vin = 12V Vin = 24V Vin = 48V
0
2
4
6
8
10
12
0 2 4 6 8 10 12 14 16 18 20
Power Dissipation (W)
Output Current (A)
Vin = 12V Vin = 24V Vin = 48V
Vo = 9V Vo = 5V
0
2
4
6
8
10
12
0 2 4 6 8 10 12 14 16 18 20
Power Dissipation (W)
Output Current (A)
Vin = 12V Vin = 24V Vin = 48V
Intentionally blank
Vo = 3.3V
Advance Data Sheet: i6A Series – 1/16
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Electrical Characteristics: I6A4W020A033V
Vo=12V Typical Output Ripple at nominal Input voltage and full
load at Ta=25 degrees
Typical Output Short Circuit Current – CH1, orange
Vo=12V Typical startup characteristic from on/off at full load.
Ch1 - output voltage, Ch2 – on/off signal
Vo=12V Typical Current Limit Characteristics
Vo=12V Typical output voltage transient response to load step
from 50% to 75% of full load with output current slew rate of
1A/uS. (Cext = 200uF)
Vo=12V Typical output voltage transient response to load step
from 75% to 25% of full load with output current slew rate of
1A/uS. (Cext = 200uF capacitor)
10
10.5
11
11.5
12
12.5
0 10 20 30 40
Output Voltage (V)
Output Current (A)
Vin = 15V Vin = 24V Vin = 48V
Vert = 10A/div
Horz =100ms/div
Vert = 10mV/div
Horz = 2us/div
CH1 = 5V/div
CH2 = 2V/div
Horz = 5ms/div
CH1 = 200mV/div
CH2 = 5A/div
Horz = 100us/div
CH1 = 500mV/div
CH2 = 5A/div
Horz = 100us/div
Advance Data Sheet: i6A Series – 1/16
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Electrical Characteristics: I6A4W020A033V
0
5
10
15
6 10.2 14.4 18.6 22.8 27 31.2 35.4 39.6 43.8 48
Output Voltage (V)
Input Voltage (V)
Io_min = 0A Io_mid = 10A Io_max = 19.9A
0
5
10
15
20
6 10.2 14.4 18.6 22.8 27 31.2 35.4 39.6 43.8 48
Input Current (A)
Input Voltage (V)
Io_min = 0A Io_mid = 10A Io_max = 19.9A
Vo=12V Typical Output Voltage vs. Input Voltage
Characteristics
Vo=12V Typical Input Current vs. Input Voltage Characteristics
Output Voltage versus Input Voltage Operating Range Vo=12V Typical load regulation
Intentionally blank
Intentionally blank
0
2
4
6
8
10
12
14
16
0 20 40 60
Output Voltage (V)
Input Voltage (V)
Upper Limit Lower Limit
11.8
11.85
11.9
11.95
12
12.05
12.1
12.15
12.2
0 2 4 6 8 10 12 14 16 18 20
Output Voltage (V)
Output Current (A)
Vin = 15V Vin = 24V Vin = 48V
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Thermal Performance: I6A4W020A033V
0
5
10
15
20
25
25 45 65 85 105 125
Output Current (A)
Temperature C)
NC 0.3 m/s (60 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
2.0 m/s (400 LFM)
TC Limits
0
5
10
15
20
25
25 45 65 85 105 125
Output Current (A)
Temperature C)
NC 0.3 m/s (60 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
2.0 m/s (400 LFM)
TC Limits
Vo=5V, Vin=36V preliminary maximum output current vs.
ambient temperature at nominal input voltage for natural
convection (60lfm) with airflow from pin 8 to pin 4.
Vo=12V, Vin=24V preliminary maximum output current vs.
ambient temperature at nominal input voltage for natural
convection (60lfm) with airflow from pin 8 to pin 4.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 20 40 60
Derating Factor
Input Voltage
Typical ambient temperature derating versus line voltage with
airflow 1m/s (200 lfm)
i6A4W020A033V thermal measurement location – top view
The thermal curves provided are based upon measurements made in TDK Lambda’s experimental test setup that is
described in the Thermal Management section. Due to the large number of variables in system design, TDK Lambda
recommends that the user verify the module’s thermal performance in the end application. The critical component should
be thermo coupled and monitored, and should not exceed the temperature limit specified in the derating curve above.
Due to the extremely wide range of operating points, it is important to verify thermal performance in the end application.
The temperature can change significantly with operating input voltage. It is critical that the thermocouple be mounted in a
manner that gives direct thermal contact or significant measurement errors may result. TDK Lambda can provide
modules with a thermocouple pre-mounted to the critical component for system verification tests.
11.5 [0.45]
7.0 [0.27]
Thermal
Measurement
Location
Best
Airflow
Orientation
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Electrical Data: I6A4W010A033V
Characteristic
Min
Typ
Max
Unit
Notes & Conditions
Output Voltage Initial Setpoint
-2 - +2 %
Vo=3.3Vsetting, Vin=Vin,nom; Io=Io,min; Tc
= 25˚C
Output Voltage Tolerance
-4 - +4 %
Over all rated input voltage, load, and
temperature conditions to end of life
Efficiency Vo = 12V --- 96.5 --- % Vin=24V; Io=Io,max; Tc=25˚C
Efficiency Vo = 12V
Vo = 24V
Vo = 40V
---
---
---
94
96.5
97.5
---
---
---
%
%
%
Vin=48V; Io=Io,max; Tc=25˚C
Line Regulation --- 0.3 --- % Vin=Vin,min to Vin,max
Load Regulation --- 0.9 --- % Io=Io,min to Io,max
Output Current 0 --- 10 A Observe maximum power limit
Output Current Limiting Threshold
--- 15 --- A Vo = 0.9*Vo,nom, Tc<Tc,max
Short Circuit Current
--- 0.5 --- A Vo = 0.25V, Tc = 25˚C
Output Ripple and Noise Voltage
--- 50 --- mVpp
Measured across one 0.1 uF ceramic
capacitor and one 22uF ceramic capacitor –
see input/output ripple measurement figure;
BW = 20MHz.
Output Voltage Adjustment Range 3.3 --- 40 V
Output Voltage Sense Range --- --- 5 %
Dynamic Response:
Recovery Time
Transient Voltage
---
---
80
500
---
---
uS
mV
di/dt =1A/uS, Vin=Vin,nom; Vo=24V, load
step from 25% to 75% of Io,max
Switching Frequency --- 400 --- kHz Fixed
External Load Capacitance 0 --- 1500* uF 100uF minimum recommended when output
voltage is 12V or higher
Vref --- 0.6 --- V Required for trim calculation
Vonom --- 2.9 --- V Required for trim calculation
F --- 42200 --- Required for trim calculation
G --- 511 --- Required for trim calculation
*Please contact TDK Lambda for technical support for very low esr capacitor banks or if higher capacitance is required
Advance Data Sheet: i6A Series – 1/16
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Electrical Characteristics: I6A4W010A033V
Typical Efficiency and Power Loss vs. Input Voltage
70
75
80
85
90
95
100
0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6
Efficiency, η
η
η
η(%)
Output Current (A)
Vin = 48V Vin = 53V
0
1
2
3
4
5
6
7
0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6
Power Dissipation (W)
Output Current (A)
Vin = 48V Vin = 53V
Vo = 40V Vo = 40V
70
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8 9 10
Efficiency, η
η
η
η(%)
Output Current (A)
Vin = 30V Vin = 40V Vin = 53V
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8 9 10
Power Dissipation (W)
Output Current (A)
Vin = 30V Vin = 40V Vin = 53V
Vo = 24V Vo = 24V
70
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8 9 10
Efficiency, η
η
η
η(%)
Output Current (A)
Vin = 16V Vin = 30V Vin = 53V
0
1
2
3
4
5
6
7
8
9
0 1 2 3 4 5 6 7 8 9 10
Power Dissipation (W)
Output Current (A)
Vin = 16V Vin = 30V Vin = 53V
Vo=12V Vo=12V
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Electrical Characteristics: I6A4W010A033V
Vo=24V Typical Output Ripple at nominal Input voltage and full
load at Ta=25 degrees
Typical Output Short Circuit Current – CH1, orange
23
23.2
23.4
23.6
23.8
24
24.2
0 2 4 6 8 10 12 14 16 18 20
Output Voltage (V)
Output Current (A)
Vin = 30V Vin = 40V Vin = 53V
Vo=24V Typical startup characteristic from on/off at full load.
Ch1 - output voltage, Ch2 – on/off signal
Vo=24V Typical Current Limit Characteristics
Vo=24V Typical output voltage transient response to load step
from 50% to 75% of full load with output current slew rate of
1A/uS. (Cext = 22uF)
Vo=24V Typical output voltage transient response to load step
from 75% to 25% of full load with output current slew rate of
1A/uS. (Cext = 22uF capacitor)
Vert = 10A/div
Horz =100ms/div
Vert = 50mV/div
Horz = 2us/div
CH1 = 5V/div
CH2 = 5V/div
Horz = 5ms/div
CH1 = 200mV/div
CH2 = 2A/div
Horz = 100us/div
CH1 = 500mV/div
CH2 =2A/div
Horz = 100us/div
Advance Data Sheet: i6A Series – 1/16
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Electrical Characteristics: I6A4W010A033V
0
1
2
3
4
5
6
6 6.5 7 7.5 8 8.5 9 9.5 10
Output Voltage (V)
Input Voltage (V)
Io_min = 0A Io_mid = 5A Io_max = 10A
0
1
2
3
4
5
6
7
8
9
10
1 5.7 10.4 15.1 19.8 24.5 29.2 33.9 38.6 43.3 48
Input Current (A)
Input Voltage (V)
Io_min = 0A Io_mid = 5A Io_max = 10A
Vo=5V Typical Output Voltage vs. Input Voltage Characteristics Vo=24V Typical Input Current vs. Input Voltage Characteristics
23.5
23.6
23.7
23.8
23.9
24
24.1
24.2
24.3
24.4
24.5
0 1 2 3 4 5 6 7 8 9 10
Output Voltage (V)
Output Current (A)
Vin = 30V Vin = 40V Vin = 53V
Output Voltage versus Input Voltage Operating Range Vo=24V Typical load regulation
Intentionally blank
Intentionally blank
0
5
10
15
20
25
30
35
40
45
0 20 40 60
Output Voltage (V)
Input Voltage (V)
Upper Limit Lower Limit
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Thermal Performance: I6A4W010A033V
0
2
4
6
8
10
12
25 35 45 55 65 75 85 95 105 115 125
Output Current (A)
Temperature (°C)
NC 0.5 m/s (100 LFM)
1.0 m/s (200 LFM) 2.0 m/s (400 LFM)
3.0 m/s (600 LFM) TC Limits
0
2
4
6
8
10
12
25 35 45 55 65 75 85 95 105 115 125
Output Current (A)
Temperature (°C)
NC 0.5 m/s (100 LFM)
1.0 m/s (200 LFM) 2.0 m/s (400 LFM)
3.0 m/s (600 LFM) TC Limits
Vo=24V, Vin=36V preliminary maximum output current vs.
ambient temperature at nominal input voltage for natural
convection (60lfm) with airflow from pin 4 to pin 3.
Vo=12V, Vin=24V preliminary maximum output current vs.
ambient temperature at nominal input voltage for natural
convection (60lfm) with airflow from pin 8 to pin 4.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 20 40 60
Derating Factor
Input Voltage
Typical ambient temperature derating versus line voltage with
airflow 1m/s (200 lfm)
i6A4W010A033V thermal measurement location – top view
The thermal curves provided are based upon measurements made in TDK Lambda’s experimental test setup that is
described in the Thermal Management section. Due to the large number of variables in system design, TDK Lambda
recommends that the user verify the module’s thermal performance in the end application. The critical component should
be thermo coupled and monitored, and should not exceed the temperature limit specified in the derating curve above.
Due to the extremely wide range of operating points, it is important to verify thermal performance in the end application.
The temperature can change significantly with operating input voltage. It is critical that the thermocouple be mounted in a
manner that gives direct thermal contact or significant measurement errors may result. TDK Lambda can provide
modules with a thermocouple pre-mounted to the critical component for system verification tests.
11.5 [0.45]
7.0 [0.27]
Thermal
Measurement
Location
Best
Airflow
Orientation
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Thermal Management:
An important part of the overall system design process
is thermal management; thermal design must be
considered at all levels to ensure good reliability and
lifetime of the final system. Superior thermal design
and the ability to operate in severe application
environments are key elements of a robust, reliable
power module.
A finite amount of heat must be dissipated from the
power module to the surrounding environment. This
heat is transferred by the three modes of heat
transfer: convection, conduction and radiation. While
all three modes of heat transfer are present in every
application, convection is the dominant mode of heat
transfer in most applications. However, to ensure
adequate cooling and proper operation, all three
modes should be considered in a final system
configuration.
The open frame design of the power module provides
an air path to individual components. This air path
improves convection cooling to the surrounding
environment, which reduces areas of heat
concentration and resulting hot spots.
Test Setup:
The thermal performance data of the
power module is based upon measurements obtained
from a wind tunnel test with the setup shown in the
wind tunnel figure. This thermal test setup replicates
the typical thermal environments encountered in most
modern electronic systems with distributed power
architectures. The electronic equipment in
networking, telecom, wireless, and advanced
computer systems operates in similar environments
and utilizes vertically mounted PCBs or circuit cards in
cabinet racks.
The power module, as shown in the figure, is mounted
on a printed circuit board (PCB) and is vertically
oriented within the wind tunnel. The cross section of
the airflow passage is rectangular. The spacing
between the top of the module and a parallel facing
PCB is kept at a constant (0.5 in). The power
module’s orientation with respect to the airflow
direction can have a significant impact on the
module’s thermal performance.
Thermal Derating
:
For proper application of the
power module in a given thermal environment, output
current derating curves are provided as a design
guideline on the Thermal Performance section for the
power module of interest. The module temperature
should be measured in the final system configuration
to ensure proper thermal management of the power
module. For thermal performance verification, the
module temperature should be measured at the
component indicated in the thermal measurement
location figure on the thermal performance page for
the power module of interest. In all conditions, the
power module should be operated below the
maximum operating temperature shown on the
derating curve. For improved design margins and
enhanced system reliability, the power module may be
operated at temperatures below the maximum rated
operating temperature
.
Heat transfer by convection can be enhanced by
increasing the airflow rate that the power module
experiences. The maximum output current of the
power module is a function of ambient temperature
(T
AMB
) and airflow rate as shown in the thermal
performance figures on the thermal performance page
for the power module of interest. The curves in the
figures are shown for natural convection through 2 m/s
(400 ft/min). The data for the natural convection
condition has been collected at 0.3 m/s (60 ft/min) of
airflow, which is the typical airflow generated by other
heat dissipating components in many of the systems
that these types of modules are used in. In the final
system configurations, the airflow rate for the natural
convection condition can vary due to temperature
gradients from other heat dissipating components.
AIRFLOW
Air Velocity and Ambient Temperature
Measurement Location
A
I
R
F
L
O
W
12.7
(0.50)
Module
Centerline
Air Passage
Centerline
Adjacent PCB
76 (3.0)
Wind Tunnel Test Setup Figure
Dimensions are in
millimeters and (inches).
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Operating Information:
Over-Current Protection: The power modules have
short circuit protection to protect the module during
severe overload conditions. During overload
conditions, the power modules may protect
themselves by entering a hiccup current limit mode.
The modules will operate normally once the output
current returns to the specified operating range. Long
term operation outside the rated conditions and prior
to the hiccup protection engaging is not recommended
unless measures are taken to ensure the module’s
thermal limits are being observed.
Remote On/Off: - The power modules have an
internal remote on/off circuit. The user must supply
compatible switch between the GND pin and the on/off
pin. The maximum voltage generated by the power
module at the on/off terminal is Vin,max. The
maximum allowable leakage current of the switch is
10 uA. The switch must be capable of maintaining a
low signal Von/off < 0.25V while sinking 1mA.
The standard on/off logic is positive logic. In the
circuit configuration shown the power module will turn
off if the external switch is on and it will be on if the
switch is off and the on/off pin is open. If the positive
logic feature is not being used, terminal 2 should be
left open. A voltage source should not be applied to
the on/off terminal.
On/Off Circuit for positive or negative logic
An optional negative logic is available. In the circuit
configuration shown the power module will turn on if
the external switch is on and it will be off if the external
switch is off. If the negative logic feature is not being
used, terminal 2 should be connected to ground.
Remote Sense: The power modules feature remote
sense to compensate for the effect of output
distribution drops. The output voltage sense range
defines the maximum voltage allowed between the
output power and sense terminals, and it is found on
the electrical data page for the power module of
interest. If the remote sense feature is not being
used, the Sense terminal should be connected to the
Vo terminal.
The output voltage at the Vo terminal can be
increased by either the remote sense or the output
voltage adjustment feature. The maximum voltage
increase allowed is the larger of the remote sense
range or the output voltage adjustment range; it is not
the sum of both. As the output voltage increases due
to the use of the remote sense, the maximum output
current may need to be decreased for the power
module to remain below its maximum power rating.
Power Good: The power module features an open-
drain power good signal which indicates if the output
voltage is being regulated. When power is applied to
the module, but the output voltage is typically more
than +/- 12% from the nominal voltage set point due to
input under voltage, over temperature, over load, or
loss of control the power good will be pulled to ground
through a 75 ohm maximum impedance. A 10kohm
resistor is recommended if pulling up to 3.3V source.
The voltage on the power good pin should be limited
to less than 6V in all cases. If the power good feature
is not used, the pin should be left open.
GND
On/ Off
Vin (+)
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Output Voltage Adjustment: The output voltage
of
the power module may be adjusted by using an
external resistor connected between the Vout trim
terminal and GND terminal. If the output voltage
adjustment feature is not used, trim terminal should be
left open. Care should be taken to avoid injecting
noise into the power module’s trim pin.
Trim
Vout(+)
Rup
GND
Circuit to increase output voltage
With a resistor between the trim and GND terminals,
the output voltage is adjusted up. To adjust the output
voltage from Vo,nom to Vo,up the trim resistor should
be chosen according to the following equation:
Ru Vref F
Voup Vonom
G:=
The values of Vref, G and F are found in the electrical
data section for the power module of interest. The
maximum power available from the power module is
fixed. As the output voltage is trimmed up, the
maximum output current must be decreased to
maintain the maximum rated power of the module.
e.g. Vo = 5V
Ru 0.6 36500
5
2.59
511:=
20A
Vout (V) Ru (Kohm)
3.3 30.3
5 8.57
9.6 2.61
12 1.82
15 1.25
10A
Vout (V) Ru (Kohm)
5 11.5
12 2.27
18 1.17
24 0.69
28 0.5
40 0.17
Synchronization: The i6A modules can be
synchronized to one another or to an external clock
within +/- 20% of nominal value shown on electrical
characteristics page by using pin 32(SYNC) and pin
33 (MS). Interleaving of switching can also be
achieved to achieve input noise cancellation.
If MS pin is tied to Vin pin it will become a clock
master. In this mode pin 32 (Sync) will become a
clock output that can be used to synchronize other i6A
power modules.
If MS pin is left open then pin 32 (sync) will become a
clock input and the module will synchronize to the
clock signal with no phase shift.
If MS pin is tied to GND then pin 32 (sync) will
become a clock input and the module will synchronize
to the clock signal with 180 degree phase shift.
If an external clock signal is being used, it is
recommended to use a 5k resistor from sync pin to
clock and limit clock signal slew rate to 10V/us. The
sync signal should be 50% duty cycle square wave
with 2V minimum logic high and 0.8V maximum for
logic low.
Sequencing: The sequence pin 34, is used for output
voltage tracking. The voltage sequencing feature
enables the user to implement various types of power
up and power down sequencing schemes including
sequential startup, ratiometric startup, and
simultaneous startup. If the sequencing feature is not
being used, the Seq pin should be connected by a
10K resistor to a 1.8V - 3.3V source. The voltage on
the sequence pin should be limited to less than 3.6V
in all cases.
To use the voltage sequencing feature, the module
should be set to an On state using the on/off feature.
The input voltage should be applied and in the
specified operating range for 15mS. After the 15mS
interval, an analog voltage can be applied to the Seq
pin and the output of the module will track the applied
voltage until the output reaches its set point voltage.
The final sequencing voltage must be higher than the
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reference voltage shown in the electrical
characteristics table. For sequential shut down, the
Seq pin voltage should be lowered. The module
output voltage will decrease as the sequence pin
voltage is lowered.
For assistance using the voltage sequencing function,
please contact TDK Lambda technical support.
EMC Considerations:
TDK Lambda power modules
are designed for use in a wide variety of systems and
applications. For assistance with designing for EMC
compliance, please contact TDK Lambda technical
support.
Input Impedance:
The source impedance of the power feeding the
DC/DC converter module will interact with the DC/DC
converter. To minimize the interaction, low-esr
capacitors should be located at the input to the
module. It is recommended that a 33uF-100uF input
capacitor be placed near the module.
Reliability:
The power modules are designed using TDK
Lambda’s stringent design guidelines for component
derating, product qualification, and design reviews.
The MTBF is calculated to be greater than 12 million
hours at full output power and Ta = 40˚C using the
Telcordia SR-332 calculation method.
Quality:
TDK Lambda’s product development process
incorporates advanced quality planning tools such as
FMEA and Cpk analysis to ensure designs are robust
and reliable. All products are assembled at ISO
certified assembly plant
Input/Output Ripple and Noise Measurements:
100KHz
Voutput
Cext
1
2
+
1uH
1
2
esr<0.1
Battery
100KHz
+
RLoad
1
2
esr<0.1
-
Vinput
1000uF
1
2
Ground
Plane
300uF
1
2
-
The input reflected ripple is measured with a current probe and oscilloscope. The ripple current is the current through the 1uH inductor.
The output ripple measurement is made approximately 9 cm (3.5 in.) from the power module using an oscilloscope and BNC socket. The
capacitor Cext is located about 5 cm (2 in.) from the power module; its value varies from code to code and is found on the electrical data page
for the power module of interest under the ripple & noise voltage specification in the Notes & Conditions column.
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Safety Considerations:
As of the publishing date, certain safety agency
approvals may have been received on the i6A series
and others may still be pending. Check with TDK
Lambda for the latest status of safety approvals on the
i6A product line.
For safety agency approval of the system in which the
DC-DC power module is installed, the power module
must be installed in compliance with the creepage and
clearance requirements of the safety agency.
To preserve maximum flexibility, the power modules
are not internally fused. An external input line normal
blow fuse with a maximum value of 30A is required by
safety agencies. A lower value fuse can be selected
based upon the maximum dc input current and
maximum inrush energy of the power module.
Warranty:
TDK Lambda’s comprehensive line of power solutions
includes efficient, high-density DC-DC converters.
TDK Lambda offers a three-year limited warranty.
Complete warranty information is listed on our web
site or is available upon request from TDK Lambda.
Information furnished by TDK Lambda is believed to be accurate and reliable. However, TDK Lambda assumes no responsibility
for its use, nor for any infringement of patents or other rights of third parties, which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of TDK Lambda. TDK components are not designed to be used in
applications, such as life support systems, wherein failure or malfunction could result in injury or death. All sales are subject to
TDK Lambda’s Terms and Conditions of Sale, which are available upon request. Specifications are subject to change without
3320 Matrix Drive, Suite 100
Richardson, TX 75082
Phone (800)526-2324 Toll Free
(214)347-5869
Lambda.TechSupport@us.tdk-lambda.com
http://www.TDK-Lambda.com/

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