HV9980

Features

Integrated 200V, 25Ω (typ.) MOSFETs

Programmable output current to 80mA per channel

TTL compatible PWM dimming inputs

3-Phase synchronous operation

Leading edge blanking

Short circuit protection with skip mode

Over-temperature protection

Applications

LCD panel backlighting

DLP RPTV or projector LED engine driver

RGB decorative lighting

General LED lighting

General Description

The HV9980 is a fully integrated 3-channel peak-current

PWM controller for driving buck converters in constant output

current mode. It is optimized for use with a large array of

20~80mA LED strings, where multiple HV9980 ICs are used

sharing a common clock and a common reference voltage.

Both the clock and the voltage reference are external to the

HV9980 for improved output current accuracy and uniform

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illumination. The output currents are programmed by

controlling peak source current in each of the three internal

200V, 25Ω switching MOSFETs.

The peak current is detected by monitoring voltage at external

sense resistors connected to RSENSE1-3. The switching

MOSFET is turned off when the corresponding current sense

signal exceeds the reference voltage applied at REF1-3 (in

the case of normal output signal polarity). Beginning of the

next switching cycle is determined by the external clock

signal received at the CLK input. All three channels operate

at a switching frequency of 1/6 of the external clock frequency

and positioned 120º out-of-phase for the purpose of input and

output ripple current reduction. Each channel is protected

from an output short circuit condition. When an over-current

condition is detected in the output switch (RSENSE1-3),

the corresponding channel shuts down for 200us. HV9980

recovers automatically, when the short circuit condition is

removed. Each current sense input (CS1-CS3) is equipped

with a leading edge blanking delay to prevent false triggering

of the current sense comparators due to circuit parasitics.

Over-temperature protection is included to prevent

destructive failures due to over-heating. Programmable

slope compensation is available at each CS input. AGND and

PGND1-3 must be tied together on the printed circuit board.

VDD1-3 must be also connected together on the PCB.

3-Channel LED Array Driver IC

Typical Application Circuit

C

IN

D1

L1

C1

4

HV9980WG

U1

21

D2

L2

C2

17

D3

L3

C3

16

20

18

R

SENSE2

19

8

2

2

C

DD2

24

22

R

SENSE1

23

2

1

1

C

DD1

13

15

R

SENSE3

14

11

3

3

C

DD3

9

12

1

7

10

3

6

5

AGND

PWMD1

PWMD2

PWMD3

REF1

REF2

REF3

CLOCK

POL

+V

IN

3

1

2

C

REF1

C

REF2

C

REF3

R

REF1

R

REF2

R

REF3

+8V