SG6105 ETC, SG6105 Datasheet - Page 11

• Manufacturer Part Number: SG6105
• Description: Power Supply Supervisor + Regulator + PWM
• Manufacturer: ETC

Power Supply Supervisor + Regulator + PWM
PWM switching signal in the secondary power
transformer is proportional to the AC line voltage. Adjust
the ratio of resistor divider to decide the threshold of
power-down warning. A small capacitor is connected
from UVAC to ground for filtering the switching noise.
Over Power Protection (OPP)
detecting over power and/or short-circuit conditions.
When OPPS voltage (p.4, Note-1) is higher than 2.1V and
this situation existed for longer than 7 msec, 6105 will
pull the PG low and lock off the power outputs.
©System General Corp.
Version 2.3(IRO33.0011.B0)
Vin
The OPP (over power protection) is used for
R1
R2
VS
Vdd
C1
R1
0.7V
+
C1
R2
UVAC
Vo
R3
OP1
OP2
OPP
- 11 -
Negative Voltage Protection
for negative voltage outputs. An under-voltage represents
the phenomenal of the overload condition in negative
voltage output. For example, the –12V output may drop
to –10V during the overload situation. A resistor
determining the threshold of the protection is connected
from pin NVP to the negative voltage output. Via this
resistor, NVP outputs a 64uA constant current to the
negative voltage output. When the NVP voltage is over
2.1V and the situation kept for longer than 7 msec, 6105
will lock the power outputs off.
2.1V.
The NVP provides an UVP (under voltage protection)
VNVP = 64 uA × (R1 + R2) – V-12V
The power outputs will be locked off when VNVP ≥
+
2.1V
64uA
R1
Product Specification
R2
-12V
www.sg.com.tw
-5V
June 19, 2003
SG6105