SD6109 Silan Microelectronics Joint-stock, SD6109 Datasheet - Page 7

• Manufacturer Part Number: SD6109
• Description: VOLTAGE MODE PWM POWER SUPPLY
• Manufacturer: Silan Microelectronics Joint-stock

2.
The PC generates the remote switch control signal which is connected to PSON. When the control signal is low,
PC power is on. And when the control signal is high, PC power is off..
3.
The AC line voltage is coupled from the primary side to the secondary side through the main transformer, and
UVAC is connected to the secondary side by a resistor. When UVAC voltage drops below 0.7V and maintains
this situation over 200us, the PG signal will be pulled low , and it indicates that the AC line is power-down. The
voltage amplitude of the PWM switching signal from the secondary side is proportional to the AC line voltage.
Adjusting the ratio of the voltage divider can set the threshold for the power-down.
4.
The over power protection is designed to detect over power and short circuit.. When the voltage of OPP is higher
than 2.4V and maintain this situation over 7msec, PG will be pulled low and the power outputs will be locked
5.
The negative voltage protection is designed to provide under voltage protection for negative voltage output.
Overload and short circuit can cause under voltage of negative voltage output.. When the voltage of NVP is
higher than 2.1V and this situation exists for longer than 7msec, the power outputs will be off and be locked.
Adjusting the resistor will set the threshold for locking the power outputs off. The threshold is determined by:
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
Remote Switch Control (PSON)
AC Fails Detection (UVAC)
Over Power Protection (OPP)
Negative Voltage Protection (NVP)
V
V
NVP
NVP
=I
=I
NVP
NVP
X (R1+R2)+V-12V
X R1+V-5V-0.7V
REV:1.1
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Page 7 of 11
SD6109
2009.02.23