HV9980 데이터 시트보기 (PDF) - Supertex Inc

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HV9980

3-Channel LED Array Driver IC

Supertex Inc 

HV9980

Pin Description

Pin #

Name Description

1

REF1

Voltage reference inputs to the current sense comparators. For best noise immunity, connect an

7

REF2 RC filter at each of these pins referenced to the corresponding PGND pin. The filter can consist

10

REF3

of a 1.0nF low impedance capacitor and a 1.0kΩ resistor.

2

VDD1

Power supply inputs. For best noise immunity, bypass each of these pins to the corresponding

8

VDD2 PGND pin with a 0.1uF low impedance capacitor. The VDD pins must be tied together on the

11

VDD3

PCB.

3

CLK

Input to an external clock signal common to all three channels. Programs the switching frequency

of the power MOSFET outputs at 1/6 of the clock signal frequency.

4

PWMD1

9

PWMD2 Dedicated PWM dimming inputs for each individual LED string driver channel.

12

PWMD3

5

AGND Common return pin for CLK, POL and PWMD inputs.

6

POL

Must be connected to AGND.

13

PGND3

20

PGND2

Power return terminals for corresponding DRAIN outputs. The PGND and AGND pins must be

tied together on the PCB.

24

PGND1

14

CS3

Signal inputs to the current sense comparators. Connect these pins to the corresponding

19

CS2

RSENSE outputs directly when the slope compensation feature is not used. When the slope

compensation is needed, connect a capacitor between each RSENSE and its corresponding CS

23

CS1

pin, and connect a resistor between each CS pin and VDD.

15 RSENSE3

18

RSENSE2

Open source outputs of the switching power MOSFETs. Connect a current sense resistor

between each of the RSENSE pins and its corresponding PGND pin.

22 RSENSE1

16

DRAIN3

17

DRAIN2 Open drain outputs of the switching power MOSFETs.

21

DRAIN1

9

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