SEN012 Datasheet, PDF (5/8 Pages) Power Integrations, Inc. – Zero Loss High Voltage Sense Signal Disconnect IC

SEN012-013
QA
UB
RA
2 kΩ
VCC
R1
10 Ω
C1
Figure 13. Typical Connection with PS_(ON) Signal.
The figure above shows a typical VCC arrangement to satisfy
timing requirements.
Transistor QA is enabled during remote on condition. Capacitor
C2 will charge through D1 while C1 is charged through R1.
SENZero will turn on ahead of PFC IC. Diode D2 makes C2
voltage tracks C1 voltage. Capacitor C2 can be increased to
ensure that during turn-off, PFC turns-off first before SENZero.
Capacitors C1 and C2 can be 100 nF standard decoupling
capacitors. However, C1 needs to be ≥C2.
D2
VCC
PFC IC
GND
D1
OVP
C2
SENZero
GND
PI-6204-102510
www.powerint.com
5
Rev. B 11/05/10