PIC8518 데이터 시트보기 (PDF) - Unspecified

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PIC8518

HighEfficiency, Fixed Frequency WLED Driver

Unspecified 

FEATURES

ƒ On Board Power MOSFET

ƒ Drives up to 8 Series White LEDs

ƒ Up to 87% Efficiency

ƒ 1.2 MHz Fixed Switching Frequency

ƒ Open Load Shutdown

ƒ Low 104mV Feedback Voltage

ƒ Soft Start/PWM Dimming

ƒ UVLO, Thermal Shutdown

ƒ Internal Current Limit

ƒ Available in 6L-SOT26

APPLICATIONS

ƒ Cellular and cordless phones

ƒ Wireless LAN cards

ƒ Palmtop computers

ƒ Personal Communication equipment

ƒ Pen drives

ƒ Bluetooth devices

TYPICAL APPLICATION CIRCUIT

PIC8518

High Efficiency, Fixed

Frequency WLED Driver

DESCRIPTION

The PIC8518 is a step up converter designed for

driving up to 8 series white LEDs from 5V input.

The PIC8518 uses current mode, fixed frequency

architecture to regulate the LED current, which is

measured through an external current sense

resistor. Its low 104mV feedback voltage reduces

power loss and improves efficiency. The OV pin

monitors the output voltage and turns off the

converter if an over-voltage condition is present

due to an open circuit condition.

The PIC8518 includes under-voltage lockout,

current limiting and thermal overload protection

preventing damage in the event of an output

overload. The PIC8518 is available in small 6-pin

TSOT26.

www.picsemi.com

Road-8, House-2/A, Baridhara Diplomatic Area, Dhaka-1212, Phone: +880-2- 8861966, Fax: +880-2-8835244

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