HV9903 查看數據表（PDF） - Supertex Inc

零件编号

产品描述 (功能)

生产厂家

HV9903

White LED Driver

Supertex Inc 

HHVV99990033

It is also good practice to run the LED’s supply and

return traces as close together as possible, reducing

the loop area of the LED path. Running the return

trace on a separate layer directly underneath the

supply trace would be the ideal layout.

Split Supply Operation

The HV9903 LED driver may be used in Split Supply

application by powering the power stage directly from

the batteries, while powering the HV9903 (VDD) from

an available regulated supply within 2.6V to 4.6V.

The power stage voltage (VIN) can be higher than

4.6V so long as the inductor is being operated in

discontinues mode.

Supplying the power stage directly from the batteries

reduces the load on the regulated supply, which in

turn increases overall efficiency and keeps

components small. The same dimming techniques

used in the single-supply application may be used in

this dual-supply application.

L

D

COUT

CIN

HV9903

1 SW

VDD 6

2.6–4.6V

2 GND SHDN 5 Shutdown

3 LED RSET 4

Fault

RSET

VIN

VDD

CDD

The 3 pads along the centerline on the underside of

the HV9903 are internally connected to pin 2 and

need not be connected externally to ground.

The HV9903’s MLP package fits in most pad layouts

designed for a 6-pin SOT-23.

10

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