GM9910B Datasheet, PDF (3/8 Pages) Gamma Microelectronics Inc. – UNIVERAL HIGH BRIGHTNESS LED DRIVER

Block Diagram
VIN
Regulator
LD
CS
250 mV
GM9910B
UNIVERAL HIGH BRIGHTNESS
LED DRIVER
POR
Blanking
R
Q
S
Oscillator
VDD
GATE
GND
RT
PWMD
Pin Descriptions
Pin #
8 pin 16 pin
Function
1
1
VIN
2
4
CS
3
5
GND
4
8
GATE
5
9
PWMD
6
12
7
13
VDD
LD
Description
This pin is the input of an 10.0 - 500V linear regulator.
This pin is the current sense pin used to sense the FET current by
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.
This pin must be electrically connected to the ground of the power
train.
This pin is the output GATE driver for THE external N-channel
power MOSFET.
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.
Power supply pin for all internal circuits, It must be bypassed with a
low ESR capacitor to GND ( ≥ 0.1μF).
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
This pin sets the oscillator frequency. When a resistor is connected
RT
between 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
3