HV9931 Supertex, Inc., HV9931 Datasheet - Page 6

• Manufacturer Part Number: HV9931
• Description: Hv9931 Unity Power Factor Led Lamp Driver
• Manufacturer: Supertex, Inc.

Functional Circuit Diagram
Pin Description
Pin #
1
2
3
4
5
6
7
8
Pin Name
PWMD
GATE
GND
VDD
CS1
CS2
VIN
RT
~AC
Description
This pin is the input of a high voltage regulator.
This pin is used to sense the input and output currents of the converter. It is the inverting input
of the internal comparator.
Ground return for all the internal circuitry. This pin must be electrically connected to the ground
of the power train.
This pin is the output GATE driver for an external N-channel power MOSFET.
When this pin is pulled to GND, switching of the HV9931 is disabled. When the PWMD pin
is released, or external TTL high level is applied to it, switching will resume. This feature is
provided for applications that require PWM dimming of the LED lamp.
This is a power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor
to GND.
This pin is used to sense the input and output currents of the converter. It is the inverting input
of the internal comparator.
Oscillator control. A resistor connected between this pin and GND sets the PWM frequency. A
resistor connected between this pin and GATE sets the PWM off-time.
~AC
R
R ref1
CS1
V
IN
C
RT
CS1
VIN
IN
_
R
7.5V
D4
R
T
V
S1
S1
GATE
OSC
+
RE G
i
L1
VDD
C
L1
DD
D1
Q1
6
+
V
C1
C1
GND
_
D2
HV9931
S
R
Q
D3
+
PWMD
V
CS2
R
S2
L2
S2
i
L2
_
R
R
ref2
CS2
+
-
VO
HV9931