SMT40C Series | 40 A DC-DC Converter
C Class Non-Isolated
SMT40C SERIES
Single output
Wide trim range (0.9 Vdc to 5.0 Vdc)
High power density design means reduced board space requirement
Remote sense
Power good output signal (open collector)
Operating ambient temperature to 80
ºC
with suitable de-rating and forced air
cooling
Remote ON/OFF (positive logic)
Overtemperature protection
0 A minimum load
Input undervoltage lockout
Overcurrent and short-circuit protection
Current Sharing
Available RoHS compliant
The SMT40C is a new high density open-
frame non-isolated converter series for
space sensitive applications. The
converter has a wide input range
(10.2 Vdc to 13.8 Vdc) and offers a wide
0.9 Vdc to 5 Vdc output voltage range
with a 40 A load. An external resistor
adjusts the output voltage from its preset
value of 0.9 V to any value up to the 5 V
maximum. The SMT40C has a typical
efficiency of 92%. The series offers
remote ON/OFF, overtemperature
protection and overcurrent protection as
standard.
Its current share facility supports parallel
operation of multiple SMT40C units and
the remote sense feature enables the
SMT40C compensate for voltage drops
between the converters output and the
load. With full international safety
approvals including EN60950 and
UL/cUL60950 the SMT40C reduces
compliance costs and time to market.
[ 2 YEAR WARRANTY ]
File Name: lf_smt40c.pdf Rev (02): 01 Oct 2005
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SMT40C Series | 40 A DC-DC Converter
C Class Non-Isolated
Absolute Maximum Ratings
Characteristic
Input voltage - continuous
Operating temperature
Symbol
Vin (cont)
Top
Min
-0.3
0
Typ
Max
13.8
80
Units
V DC
ºC
Notes and Conditions
Vin(+) - Vin(-)
Measured at thermal reference
points, see Note 1. Higher
ambient operation possible with
forced air cooling. See de-rating
curves
Power good pull-up voltage
Storage temperature
Output current
Tstorage
Iout
-40
0
11
125
40
V
ºC
A
All specifications are typical at nominal input Vin =
12V,
full load under any resistive load combination at 25˚C unless otherwise stated.
Input Characteristics
Characteristic
Input voltage - operating
Input current - no load
Input current - Quiescent
Input voltage variation
Symbol
Vin (oper)
lin
lin (off)
dv/dt
Min
10.2
Typ
12.0
290
30
1.0
Max
13.8
Units
V DC
mADC
mADC
V/ms
Vin (min) - Vin (max), enabled
Converter disabled
Product was tested at 1.2V/ms.
Much higher dv/dt is possible
(>10V/ms). Consult factory for
details
Notes and Conditions
Turn On/Off
Characteristic
Input voltage - turn on
Input voltage - turn off
Turn on delay - enabled,
then power applied
Symbol
Vin (on)
Vin (off)
Tdelay
(power)
Min
8.5
7.1
Typ
9.0
7.6
Max
9.5
8.1
30
Units
V DC
V DC
msec
With the Remote ON/OFF signal
asserted, this is the time from
when the input voltage reaches
the minimum specified operating
voltage until the POWER GOOD
is asserted high
Vin = Vin (nom), then Remote
ON/OFF asserted. This is the
time taken until the POWER
GOOD is asserted high
8
3
msec
msec
Output voltage in full regulation
to POWER GOOD asserted high
From 10% to 90%; full resistive
load, 3 x 680µF external
capacitance
Notes and Conditions
Turn on delay - power
applied, then Remote ON/OFF
asserted
Output to Power Good
delay
Rise time
Tdelay
(Remote ON/OFF)
30
msec
Tdelay
Trise
File Name: lf_smt40c.pdf Rev (02): 01 Oct 2005
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SMT40C Series | 40 A DC-DC Converter
C Class Non-Isolated
Signal Electrical Interface
Characteristic - Signal Name Symbol
At remote/control ON/OFF pin
Open collector or equivalent
compatible
Control pin open circuit voltage
High level input current
Min
Typ
Max
Units
Notes and Conditions
See Notes 2 and 3
See Application Note 170 for
Remote ON/OFF details
Iih = 0µA; open circuit voltage
Current flowing into control pin
when pin is pulled high
(max. at Vih = 13.8V)
Converter guaranteed on when
control pin is greater than Vih
(max)
Converter guaranteed off
when control pin is
less than Vil (max)
ViI = 0.0 V
Vih
Iih
2.27
2.50
1
V
µA
High level input voltage
Vih
2.40
Vin
Low level input voltage
ViI
0.80
V
Low level input current
Iil (max)
1.3
mA
Reliability and Service Life
Characteristic
Mean time between failure
Symbol
MTBF
Min
95,418
Typ
Max
Units
Hours
Notes and Conditions
MIL-HDBK-217F,
Vin = Vin (nom); Iout = Iout
(max); ambient 25ºC;
ground benign environment
Telcordia SR-332
Issue 3, ground benign,
temp. = 40ºC, Vin = Vin (nom),
Iout = Iout (max)
Mean time between failure
MTBF
4,585,991
Hours
File Name: lf_smt40c.pdf Rev (02): 01 Oct 2005
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SMT40C Series | 40 A DC-DC Converter
C Class Non-Isolated
Other Specifications
Characteristic
Switching frequency
Weight
Symbol
Fsw
Min
Typ
300
28.3
Max
Units
kHz
g
Notes and Conditions
Fixed frequency
Safety Agency Approvals
Characteristic
UL/cUL 60950 File No.
E139421
TÜV Product Service IEC 60950 Certificate No. B 04 08 19870 228
Material Ratings
Characteristic - Signal Name Notes and Conditions
Flammability rating
Material type
UL94V-0
FR4 PCB
Model Numbers
Model
Number (See Notes below)
SMT40C-12SADJJ
Input
Voltage
10.2V - 13.8V
Output
Voltage
0.9 - 5.0V
Output Current
(Max.)
40A
Typical
Efficiency
92%
Max. Load
Regulation
±1.5%
RoHS Compliance Ordering Information
The ‘J’ at the end of the part number
indicates that the part is Pb-free
(RoHS 6/6 compliant). TSE RoHS 5/6
(non Pb-free) compliant versions may
be available on special request, please
contact your local sales representative
for details.
File Name: lf_smt40c.pdf Rev (02): 01 Oct 2005
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SMT40C Series | 40 A DC-DC Converter
C Class Non-Isolated
0.9V Setpoint
Input Characteristics
Characteristic
Input current - operating
Symbol
Iin
Iin (ripple)
Min
Typ
4.40
Max
Units
A DC
Notes and Conditions
Vin = Vin (nom); Iout = Iout
(max.)
Reflected ripple current
27
150
mA RMS Iout = Iout (max.), measured
mA pk-pk with external filter. See
Application Note 170 for details
µF
Input capacitance - internal
filter
Input capacitance - external
external input
Cinput
Cbypass
18.8
270
µF
Recommended customer
added capacitance.
Maximum ESR = 20mΩ
See Application Note 170 for
ripple current requirements
0.9V Setpoint
Electrical Characteristics - O/P
Characteristic
Nominal set-point voltage
Line regulation
Load regulation
Symbol
Vo (nom)
Min
0.873
Typ
0.900
±0.2
±1.5
Max
0.927
Units
V DC
%
%
Notes and Conditions
Vin = Vin (nom); Iout = Iout (NL)
Vin (min) to Vin (max)
Vin = Vin (nom); Iout (min) to
Iout (max)
Output current continuous
Output current - short circuit
Iout
Isc
Vp-p
Vrms
0
22.5
40
A DC
A rms
Continuous, unit auto recovers
from short, Vo < 100mV
Output voltage - noise
40
15
mV pk-pk Measurement bandwidth 20MHz
See Application Note 170 for
mV rms
measurement set-up details
%
Iout = Iout (max)
Current sharing
±10
File Name: lf_smt40c.pdf Rev (02): 01 Oct 2005
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