參數(shù)資料
型號(hào): SG6108
廠商: Fairchild Semiconductor Corporation
英文描述: Power Supply Supervisor + PWM
中文描述: 電源監(jiān)控器的PWM
文件頁(yè)數(shù): 13/16頁(yè)
文件大?。?/td> 656K
代理商: SG6108
Product Specification
Power Supply Supervisor + PWM
SG6108
System General Corp.
Version 1.0.1 (IAO33.0048.B0)
- 13 -
www.sg.com.tw www.fairchildsemi.com
September 26, 2007
+
R2
R1
2.1V
64uA
-12V
-5V
Vdd
OPP
OP2
OP1
R1
R2
R3
C1
Over Current Protection (OCP)
The SG6108 provides over current protection for the
3.3V, 5V and the two 12V rails. Whenever an OCP
condition occurs at any of the voltage rails, PG will be low
and PWM will be turned off. The internal OCP
comparators have a very small offset voltage (
±
5mV).
The sink currents of IS33, IS5, and IS12 are 8 times the
current at the RI pin. The current at the RI pin is V
RI
/RI.
Here is an example demonstrating how to set the over
current protection threshold:
I
RI
= V
RI
/RI = 1.0V/75k = 13.3uA
If R1 = 1700
and R12 = 0.01
, then
OC P = 13.3uA x 8 x 1700 / 0.01 = 18 A
Negative Voltage Protection
NVP provides UVP (under voltage protection) for
negative voltage outputs. An under-voltage condition
indicates an overload at a negative voltage output. For
example, the –12V output may drop to –10V during
overload situations. The resistance of a resistor connected
from NVP to the negative voltage output determines the
protection threshold voltage. NVP outputs a 64uA
constant current to the negative voltage output via this
resistor. Whenever the NVP voltage exceeds 2.1V for
longer than 7 msec the SG6108 will lock the power
outputs off.
VNVP = 64 uA
×
(R1 + R2) – V-12V
The power outputs will be locked off when VNVP
2.1V.
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