Microchip HV9919BDB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSDB-HV9919BDB1

B041914

HV9919BDB1

Single, High Current LED Driver Demoboard

Specications

The HV9919BDB1 demoboard is a high current LED

driver designed to drive one LED at 1.0A from a 9.0 -

16V DC input. The demoboard uses Supertex’s HV9919

hysteretic buck LED driver IC.

The HV9919BDB1 includes two PWM dimming modes.

The analog control of the PWM dimming mode allows

the user to dim the LED using a 0 - 2.0V analog signal

applied between the ADIM and GND pins (0V gives 0%

and 2.0V gives 100%). In this mode, the PWM dimming

frequency is set to 1kHz on the board. The digital control

of PWM dimming mode allows the user to dim the LEDs

using an external, TTL-compatible square wave source

applied between DIM and GND. In this case, the PWM

dimming frequency and duty ratio are set by the external

square wave source.

Parameter Value

Input voltage9.0 - 16VDC (steady state)

40V max (transient)

Reverse polarity protection60V (max)

Output voltage 2.0 - 5.0V

Output current1.0A ± 5%

Output current ripple (@13.5V

input and 3.3V output)16% (peak to peak)

Full load efciency

(@13.5V input)84%

Open LED protectionYes

Output short circuit protectionYes

Dimensions25.4mm X 25.4mm

General Description

Connection Diagram

Input Connection: Connect the input DC voltage between

VIN and GND terminals of connector J1 as shown in the

connection diagram.

Output Connection: Connect the LEDs between LED+

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

connector J2.

PWM Dimming Connection:

1. If no PWM dimming is required, short DIM, VDD and

ADIM terminals of connector J3.

2. If dimming using an external PWM dimming source,

connect the PWM source between the DIM and GND

terminals of connector J3 and short terminals ADIM

and VDD. The recommended PWM dimming frequen-

cy is ≤1.0kHz.

3. If dimming using an external analog voltage source,

connect the source between the ADIM and GND ter-

minals of connector J3 and short terminals DIM and

VDD. The voltage range for control of the PWM dim-

ming is 0 - 2.0V.

Connections

Silk Screen (top)

Product specificaties