HV9903 데이터 시트보기 (PDF) - Supertex Inc

부품명

상세내역

제조사

HV9903

White LED Driver

Supertex Inc 

HHVV99990033

Symbol Parameter

Min Typ. Max Unit Conditions

ISHDN SHDN input current

-100

nA

VSHDN = 0V

100

VSHDN = 2V

fSW

Inductor switching frequency

0.8

1.2

1.6

MHz VDD = 2.6 to 4.6V

DMAX Maximum duty cycle

90

95

%

VIL

IC Shutdown voltage (SHDN pin),

Off

VIH

IC Start-up voltage (SHDN pin),

1.2

On

0.9

V

VOpen Open LED indicator at RSET lead

2.0

VDD-

VDD

0.4V

V

VOUT > 33V, RSET = 562Ω, VDD =

2.7V

ISW(off) Switch Off leakage current

100

nA

VSW = 5V

Pin Configuration

SW

GND

LED

VDD

SHDN

RSET

Top View

GND

Pin 1

Bottom View

Pin Name Description

1

SW Internal switch connection.

2 GND Ground. The underside pads are internally connected to pin 2.

3 LED Cathodes of the LEDs are connected to this pin.

4 RSET For programming the LED current and dimming function.

Also functions as a Fault output to indicate an open LED condition. RSET

is pulled to VDD when an open LED condition is detected. The driver is

then latched off. To reset, the SHDN input must be asserted low.

An externally applied voltage greater than 100mV causes the LED

switch and PWM boost converter to shut off. The IC does not go into

low power standby and the soft-start circuit is not reactivated when VRset

again falls below 100mV.

5 SHDN Shut down input. A logic low disables the IC and places it in low power

standby. A logic high enables the IC via a soft-start sequence.

6

VDD Input voltage supply pin. It is common practice to use a bypass

capacitor as close as possible to the device on this pin.

3

Share Link: