HV9921/HV9922/HV9923
Functional Block Diagram
GND
DRAIN
VDD
TOFF = 10µs
Regulator
7.0V
S
R
Q
Q
REF
-
+
R
TBLANK = 300ns
HV9921/22/23
Pin Configuration
1-Drain
2-GND
3-VDD
1
2
3
1 2
3
TO-243AA (SOT-89)
TO-92
Drain – This is a drain terminal of the output switching
MOSFET and a linear regulator input.
GND – This is a common connection for all circuits.
VDD
–
This is a power supply pin for all control circuits.
Bypass this pin with a 0.1uF low impedance
capacitor.
NR092005
3