Microchip HV9910B Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSDB-HV9910BDB3

A032813

HV9910BDB3

General Description

The HV9910BDB3 demoboard is a high current LED driver

designed to drive one LED or two LEDs in series at currents

up to 1.0A from a 10 – 30VDC input. The demoboard uses

Supertex’s HV9910B Universal LED driver IC to drive a

buck converter.

The HV9910BDB3 can be congured to operate in either a

constant frequency mode (for driving a single LED) or in a

constant o-time mode (for driving two LEDs).

The output current can be adjusted in two ways – either

with linear dimming using the onboard potentiometer or

with PWM dimming by applying a TTL – compatible square

wave signal at the PWMD terminal. Using linear dimming,

the output current of the HV9910DB1 can be lowered to

about 0.01A (note: zero output current can be obtained

only by PWM dimming).

Connection Diagram

Low Voltage, High Current,

LED Driver Demoboard

Specications

Parameter Value

Input voltage10 - 30VDC

Output voltage -

constant frequency mode2.0 - 4.5V

Output voltage -

constant o-time mode4.0 - 8.0V

Maximum output current1.0A ± 10%

Output current ripple (typ)20% (peak-peak)

Efciency (@ 12V input)86% (for one LED)

93% (for two LEDs)

Open LED protectionyes

Output short circuit protectionno

Dimensions48.2mm X 29.0mm

Connections

1. Input Connection -Connect the input DC voltage

between VIN and GND terminals of connector J1 as shown

in the connection diagram.

2. Output Connection -Connect the LEDs between

LED+ (anode of LED string) and LED- (cathode of LED

string) of connector J2.

a. If the load is one LED, short the RT and FREQ

terminals of connector J4 using a jumper.

b. If the load is two LEDs, short the RT and OFFT

terminals of connector J4 using a jumper.

3. PWM Dimming Connection

a. If no PWM dimming is required, short PWMD and

VDD terminals of connector J3.

b. If PWM dimming is required, connect the TTL-

compatible PWM sourc between PWMD and GND

terminals of connector J3. The recommended PWM

dimming frequency is ≤ 1.0kHz.

+

Short for constant

frequency mode

+

-

Short for

constant o-time mode

Product specificaties