Datasheet

HV9910C
DS20005323A-page 6  2014 Microchip Technology Inc.
2.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN DESCRIPTION
Pin #
Function Description
8-Lead SOIC 16-Lead SOIC
1 1 VIN Input of an 15 - 450V linear regulator.
2 4 CS 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. Must be electrically con-
nected to the power ground.
4 8 GATE Output GATE driver for an external N-channel power MOSFET.
5 9 PWMD TTL-compatible, PWM-dimming input of the IC. When this pin is
pulled to GND or left open, the GATE driver is turned off. When the
pin is pulled high, the GATE driver operates normally.
6 12 VDD Power supply pin for all internal circuits. It must be bypassed with a
low ESR capacitor to GND (0.1F).
7 13 LD 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 Sets the oscillator frequency. When a resistor is connected
between RT and GND, the HV9910C operates in constant fre-
quency 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