Microchip HV9967BDB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

HV9967BDB1

Doc.# DSDB-HV9967BDB1

B101613

General Description

The HV9967BDB1 demoboard is a high-brightness LED

driver designed to drive 4 LEDs in series at currents up to

350mA from a 20 - 60V DC input. The demoboard uses the

Supertex’s HV9967B in a buck conguration in a constant

off-time mode.

The HV9967BDB1 LED driver features tight regulation of the

LED current within a few milliamps over the entire range of

the input voltage (i.e. 20 - 60VDC). The LED current accuracy

is almost insensitive to the passive component tolerances,

such as the inductance or the timing resistor.

PWM dimming can be achieved by applying a pulse-width-

modulated square wave signal between the PWMD and

GND pins.

4W LED Driver Demoboard

with Accurate Average-Mode Constant Current Control

Connection Diagram

1. Connect the LED string between LED+ (Anode of

LED string) and LED- (Cathode of LED string).

2. Connect the PWMD terminal to the VDD terminal

to enable the LED driver if PWM dimming is not re-

quired.

3. Connect the input DC voltage between the VIN+

and VIN- terminals.

Connections

Parameter Specification

Input voltage20 - 60 VDC

Output voltage10 -15VDC (4 x LEDs)

Output current350mA ± 5%

Output current ripple

20% pk-pk

(Typical, depending on

the type of LED)

Switching frequency Variable with constant

TOFF = 5µs ± 20%

Full load efciency Typical 80% minimum

Output short circuit protectionIncluded, hiccup mode

Specifications

VLED (+)

VLED (-)

VIN (+) VIN (-)VDD PWMD GND

Product specificaties