6
HV9910B
Supertex inc.
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
Pin Description
Block Diagram
Pin #
Function Description
8-Lead SOIC 16-Lead SOIC
1
1
VIN
This pin is the input of an 8.0 - 450V linear regulator.
2
4
CS
This pin is the current sense pin used to sense the FET current by means
of an external sense resistor. When this pin exceeds the lower of either the
internal 250mV or the voltage at the LD pin, the GATE output goes low.
3
5
GND
Ground return for all internal circuitry. This pin must be electrically con-
nected to the ground of the power train.
4
8
GATE
This pin is the output GATE driver for an external N-channel power
MOSFET.
5
9
PWMD
This is the PWM dimming input of the IC. When this pin is pulled to GND,
the GATE driver is turned off. When the pin is pulled high, the GATE driver
operates normally.
6
12
VDD
This is the power supply pin for all internal circuits.
It must be bypassed with a low ESR capacitor to GND (≥0.1μF).
7
13
LD
This pin is the linear dimming input and sets the current sense threshold as
long as the voltage at the pin is less than 250mV (typ).
8
14
RT
This pin sets the oscillator frequency. When a resistor is connected be-
tween RT and GND, the HV9910B operates in constant frequency mode.
When the resistor is connected between RT and GATE, the IC operates in
constant off-time mode.
-
2, 3, 6, 7, 10,
11, 15, 16
NC
No connection
POR
250mV
RT
PWMD
GATE
VDD
VIN
LD
CS
GND
S
R Q
Blanking
Oscillator
Regulator
+
-
+
-