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參數(shù)資料
| 型號： | GS-R51515S |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 31W Triple Output Step-Down Switching Regulator(31W三輸出降壓開關(guān)穩(wěn)壓器) |
| 中文描述： | 僅有31W三輸出降壓開關(guān)穩(wěn)壓器（僅有31W三輸出降壓開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 87K |
| 代理商： | GS-R51515S |
5/8
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; suggestedvalue is 100
μ
F/50V.
Soft-start
To avoid heavy inrush current the output voltage
rise time is typically 10ms in any conditionof 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 microprocessorsystem.
The circuit sense the input supply voltageand the
output generatedvoltage Vo1(+5V) and willgener-
ate the required reset signal only when both the
sensed voltages have reached the required value
for correct systemoperation.
When both the supply voltage and the regulated
voltage are in the correct range the output Reset
signal is generatedaftera delaytime t
DR
of 100ms
typical.
A latch assures that if a spike is present on the
sensed voltage the delay time circuit discharges
completelybeforeinitializationof anewresetcycle.
Reset output has internal pull-up resistor of
10kOhmconnected to Vo +5V pin.
Maximum sink output current is 20mA at
V
RESET(sat)
= 200mV.
Fig. 1 and fig.2 showreset waveforms.
Power Fail ProgrammableInput
This pin is internally connected via a dividerto the
+Vin pin for Power Fail function.
The factory setting is for a value of 11V with 1V
hysteresis.
It is possible to programa 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 Rpfmust be calculatedaccord-
ing to the following formula:
R
pf
=
5.1
= (
k
)
V
pf
5.1
34
0.191
whereVpf isthe desiredvalueof Power Failthresh-
old voltage.
Exampe:Vpf = 24V (must not belower than 12V):
R
pf
=
5.1
=
14k
24
5.1
34
0.191
Figure 1 - Reset and Power Fail waveforms.
GS-R51212S/GS-R51515S
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