SGS Thomson Microelectronics GS-R51212 Datasheet
20W TRIPLE OUTPUT STEP-DOWN
FEATURES
MTBF in excess of 200,000 hours
4V max drop-out voltage
Soft start
Reset output
Non-latching short circuit protection
Crow-bar outpu t overvolta ge prote ct ion
DESCRIPTION
The GS-R51212 is a versatile triple output, high
current, high voltage step-down switching regulator
modu le that provi des a +5V and two isolate d 12V
outputs. It is ideal for microprocessor based boards
because it powers the logic and the communication
ports and it has a Reset output for the correct
system start-up.
The integral heatsink allows a large power handling
capability and it provides also an effective shielding
to minimize EMI.
GS-R51212
SWITCHING REGULATOR
MAIN CHARACTERISTICS
V
i
V
o1
I
o1
V
o2
I
o2
V
o3
I
o3
Input Voltage
Output Voltage
Output Current
Output Voltage
Output Current
Output Voltage
Output Current
9 to 40V
5.1V
3.5A
12V
0.1A
12V
0.1A
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
DC Input Voltage
V
i
Reset Output Sink Current
I
rt
T
T
June 1994 1/5
Storage Temperature Range
stg
Operating Case Temperature Range
cop
42 V
20 mA
– 40 to +105 °C
– 20 to +85 °C
GS-R51212
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)
Symbol Parameter Test Conditions Min Typ Max Unit
Vo1
Vo2
Vo3
∆Vo/∆T
I
Io2
Io3
I
I
V
∆V
∆V
SVR
V
V
I
V
t
t
t
t
t
V
R
Output Voltage Vi = 24V Io1 = 2.5A
Output Voltage Vi=24V Io2 = 0.1A
Output Voltage Vi = 24V Io3 = 0.1A
Temperature Stability All Outputs
Input Voltage
V
i
Output Current Vi = 24V
1
o
Output Current Vi = 24V
Output Current Vi = 24V
Average Input Current Vi = 40V Vo1 = 0V
isc
Average Input Current Vi = 40V Vo1/2/3 = 0V
isc
Reflected Input Current Vi = 24V Io1 = 2.5A Io2,3 = 0.1A
I
ir
5V to 12V Isolation Voltage
is
Switching Frequency
f
s
Efficiency Vi = 24V Io1 = 2.5A Io2,3 = 0.1A
η
Line Regulation Io1 = 2.5A Vi = 15 to 25V Io2,3 = 0.1A
o
Load Regulation Vi = 24V Io1 = 0.5 to 2.5A
o
Supply Voltage Rejection 50/60Hz
Output Ripple Voltage Vi = 24V Io1 = 2.5A
or
Output Noise Voltage Vi = 24V Io1 = 2.5A
on
Reset Leakage Current
rh
Reset Low Level I
rl
Reset Delay Time
rd
Line Transient Recovery Time Io1 = 2.5A Vi = 15 to 35V
r1
Load Transient Recovery T ime Vi = 24V Io = 0.5 to 2.5A
r2
Soft Start Time
ss
Crowbar Delay Time
cd
Crowbar Intervention Threshold
cth
Thermal Resistance Case to ambient
th
Vi = 24V Io2,Io3 = 0.05 to 0.1A
= 5mA
reset
4.95 5.1 5.2 V
11.5 12.5 V
11.5 12.5 V
0.2 mV/°C
940V
0.5 3.5 A
0.1 A
0.1 A
0.1 0.2 A
0.1 0.2 A
200 mApp
200 V
100 kHz
70 %
2 mV/V
35
600
4 mV/V
30 mVpp
40 mVpp
100 µA
0.2 V
100 ms
500 µs
200 µs
10 ms
5 µs
6.37 V
5 °C/W
DC
mV/A
2/5
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