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Supertex inc.

www.supertex.com

HV9980DB1

Doc.# DSDB-HV9980DB1

A032913

General Description

The HV9980B1 demoboard is an RGB or multi-channel

white LED backlight driver designed to drive LEDs for

a large-screen TV. The HV9980DB1 can drive three

common-anode LED strings from a 100 - 140V input at

currents up to 70mA in steady state. It can also drive the

LEDs at currents as large as 160mA for short durations to

facilitate backlight scanning mode.

Each of the three channels can be individually controlled

by PWM dimming. The demoboard is also protected from

short circuit conditions across any string and recovers

automatically once the condition disappears.

Connection Diagram

3-Channel LED Array Driver IC

Specications

Parameter Value

Input voltage (VIN) 100 - 140V

IC supply voltage (VDD) 6.0 - 10V

Output voltage 20V (min)

< ½ of input voltage (max)

Output current (steady state) 70mA (max)

Output current (short durations) 160mA (max)

Switching frequency (requires an

external 1.8MHz clock signal) 300kHz

REF input 0 - 1.0V

Output current ripple (typ) <5% peak - peak

Efciency (@ 120V input and

40V, 50mA output) ~90%

Open LED protection YES

Output short circuit protection YES

Actual Board Size: 68.8mm x 36.1mm

120V

0 - 0.9V

8.0V

HV9980DB1

Supertex inc.

www.supertex.com

Doc.# DSDB-HV9980DB1

A032913

Connections

Pin Connection

VIN Powers the three LED strings, providing the LED string voltage is less than ½ of the input voltage. Connect a

high voltage 100 - 140V source at this terminal.

VDD Powers the HV9980 control circuit. Connect a 6.0 - 10V source at this terminal.

REF Voltage at the REF terminal controls the output current level. The peak inductor current is approximately 1/5th

of the REF voltage.

CLK Provides a clock input to the HV9980. The switching frequency is 1/6th of the CLK frequency. Connect a

1.8MHz TTL compatible signal at this terminal.

PWMD1-3

These inputs can be used to PWM dim the three channels. Connect these pins to VDD to enable all three

channels permanently. A TTL compatible, low frequency (<1kHz) square wave can be used to PWM dim each

channel individually.

GND(s) The two GND terminals are wired together on the board. They form the return path for all the input signals.

COM This is the common anode connection for all three LED strings.

Ch1-3 These terminals are the cathode connections for the three LED strings.

Typical Results

Efficiency vs. Input Voltage

(@V

= 40 IV;

= 50mA)

90 110 130 150

Input ltage (V)Vo

Efficiency (%)

Efficiency vs. Load ltageVo

(@V

= 120V; I

= 50mA)

15 25 35 45

Load ltage (V)Vo

Efficiency (%)

Line Regulation of Output Current

(@V

= 40V)

49.5

90 0 130 15011

Input Voltage (V)

Output Current (mA)

Load Regulation of Output Current

(@V

= 120V)

15 25 35 45

Load Voltage (V)

Output Current (mA)

HV9980DB1

Supertex inc.

www.supertex.com

Doc.# DSDB-HV9980DB1

A032913

Drain of channel 1

Drain of channel 2

Drain of channel 3

LED current in Channel 1

Fig. 1: Steady State Operation

(Time scale: 1.0µs/div)

Fig.1 shows the drain voltage and LED current waveforms during normal operation. The three channels are phase shifted

by 120° with respect to each other. The switching frequency for each channel is 300kHz (1/6th of the CLK frequency).

Fig. 2 shows the hiccup mode short circuit protection of the HV9980. The output of channel is shorted by connecting COM to

CH1. Channel 1 tries to restart every 200μs. The other two channels work normally and are not affected by the short circuit

on one channel. The short circuit timing is started when the voltage at RS reaches 1.15V (about 230mA).

Drain of channel 1

Drain of channel 2

Drain of channel 3

LED current in Channel 1

Fig. 2: Operation during Output Short Circuit

(Time scale: 50µs/div)

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	HV9980DB1
Färg på produkten:	Zwart
Bredd:	538 mm
Djup:	438 mm
Höjd:	195 mm
Förpackningens vikt:	7000 g
Förpackningens bredd:	650 mm
Djuppackning:	580 mm
Förpackningshöjd:	290 mm
Användarmanual:	Ja
Typ av handfat:	Onderbouwspoelbak
Forma handfat:	Rechthoekig
Diskbänksmaterial:	Roestvrijstaal
Antal handfat:	1 kommen
Form första diskbänken:	Rechthoekig
Första skålens mått (BxL):	500 x 400 mm
Först kommer djupet:	195 mm
Kraangat:	Nee
Disken:	Nee
Kran ingår:	Nee
Diskbänksstorlek:	3.5 "