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PDF GS-R51515S Data sheet ( Hoja de datos )
| Número de pieza | GS-R51515S | |
| Descripción | 31WTRIPLE OUTPUT STEP-DOWN SWITCHING REGULATORS | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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GS-R51212S
GS-R51515S
31W TRIPLE OUTPUT STEP-DOWN SWITCHING REGULATORS
Type
GS-R51212S
GS-R51515S
Vi
15 to 40 V
15 to 40 V
Vo
+ 5,1 V
± 12 V
+ 5,1 V
± 15 V
Io
4,5 A
0,35 A
4,5 A
0,3 A
FEATURES
5.1V/4.5A and ±12V/0.35A or ±15V/0.3A output
voltages
±12 or ±15V externally adjustable
High efficiency (81% typ.)
Short-circuit protection
Reset output
Power Fail programmable input
Inhibit/Enable control input
Soft-start
PCB or chassis mounting
DESCRIPTION
The GS-R51212S and GS-R51515S are versatile
triple output, high current step-down switching
regulators that provide +5.1V/4.5A output voltage
and an isolated ±12V/0.35A or ±15V/0.3A dual
output voltage.
They are ideal for microprocessor based boards
because power the logic and the communication
ports and have Reset output and Power Fail pro-
grammable input for the correct system start-up.
The Inhibit/Enable pin allows the ON/OFF logic
function with TTL/CMOS compatible input signal.
The auxiliary outputs (±12V or ±15V) are externally
adjustable in a very wide range, i.e. from ±4.25V to
±12.45V on GS-R51212S and from ±4.50V to
±15.25V (typical values) on GS-R51515S.
ABSOLUTE MAXIMUM RATINGS
Symbol
Vi
Irs
Parameter
DC Input Voltage
Reset Output Sink Current
Value
44
20
Unit
V
mA
June 1994
1/8
1 page  
GS-R51212S/GS-R51515S
USER NOTES
Input Voltage
The recommended operating maximum DC input
voltage is 40V inclusive of the ripple voltage. The
use of an external low ESR, high ripple current
capacitor located as close the module as possible
is recommended; suggested value is 100µF/50V.
Soft-start
To avoid heavy inrush current the output voltage
rise time is typically 10ms in any condition of load.
Power Fail-Reset Circuit
The module include a voltage sensing circuit that
may be used to generate a power-on/power-off
reset signal for a microprocessor system.
The circuit sense the input supply voltage and the
output generated voltage Vo1 (+5V) and will gener-
ate the required reset signal only when both the
sensed voltages have reached the required value
for correct system operation.
When both the supply voltage and the regulated
voltage are in the correct range the output Reset
signal is generated after a delay time tDR of 100ms
typical.
A latch assures that if a spike is present on the
sensed voltage the delay time circuit discharges
completely before initialization of a new reset cycle.
Reset output has internal pull-up resistor of
10kOhm connected to Vo +5V pin.
Maximum sink output current is 20mA at
VRESET(sat) = 200mV.
Fig. 1 and fig. 2 show reset waveforms.
Power Fail Programmable Input
This pin is internally connected via a divider to the
+Vin pin for Power Fail function.
The factory setting is for a value of 11V with 1V
hysteresis.
It is possible to program a different value of Power
Fail threshold by connecting a resistor (Rpf) be-
tween pin 3 (Power Fail Input) and pin 1 (GND
Input). The value of Rpf must be calculated accord-
ing to the following formula:
Rpf =
5.1 = (kΩ)
Vpf − 5.1 − 0.191
34
where Vpf is the desired value of Power Fail thresh-
old voltage.
Exampe: Vpf = 24V (must not be lower than 12V):
Rpf =
5.1 = 14kΩ
24 − 5.1 − 0.191
34
Figure 1 - Reset and Power Fail waveforms.
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet GS-R51515S.PDF ] | |
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