HV9912 查看數據表（PDF） - Supertex Inc

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HV9912

Switch-mode LED Driver IC With High Current Accuracy and Hiccup Mode Protection

Supertex Inc 

HV9912

Pin Description

Pin #

Pin Description

1

VIN This pin is the input of a 90V high voltage regulator.

2

VDD

This is a power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor to

GND (at least 0.1µF).

3

GATE This pin is the output gate driver for an external N-channel power MOSFET.

4

GND

Ground return for all the low power analog internal circuitry. This pin must be connected to the return

path from the input.

5

CS

This pin is used to sense the source current of the external power FET. It includes a built-in 100ns

(min) blanking time.

6

SC This pin is used to set the slope compensation.

7

RT

This pin sets the frequency of the power circuit. A resistor between RT and GND will program the

circuit in constant frequency mode.

8

SYNC

This I/O pin may be connected to the SYNC pin of other HV9912 circuits and will cause the oscillators

to lock to the highest frequency oscillator.

9

CLIM

This pin provides a programmable input current limit for the converter. The current limit can be set

by using a resistor divider from the REF pin.

10

REF

This pin provides 2% accurate reference voltage. It must be bypassed with a 0.01μF – 0.1μF

capacitor to GND.

This pin is pulled to ground when there is an output short circuit condition or output over voltage

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FAULT condition. This pin can be used to drive an external MOSFET in the case of boost converters to

disconnect the load from the source.

This pin provides the over voltage protection for the converter. When the voltage at this pin exceeds

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OVP 5V, the gate output of the HV9912 is turned off and FLT goes low. The IC will turn on when the

voltage at the pin goes below 4.5V.

13

PWMD

When this pin is pulled to GND (or left open), switching of the HV9912 is disabled. When an external

TTL high level is applied to it, switching will resume.

14

COMP

Stable Closed loop control can be accomplished by connecting a compensation network between

COMP and GND. This capacitor also controls the hiccup time.

15

IREF

The voltage at this pin sets the output current level. The current reference can be set using a resistor

divider from the REF pin.

16

FDBK This pin provides output current feedback to the HV9912 by using a current sense resistor.

● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

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