Description

The A8515 is a multi-output white LED (WLED) driver for LCD backlighting in consumer and industrial displays. It integrates a current-mode boost converter with an internal power DMOS switch and two current sinks. The boost converter can drive up to 24 LEDs: 12 LEDs per string at 120 mA. The LED sinks can be paralleled together to achieve higher LED currents, up to 240 mA. The A8515 can operate from a single power supply, from 5 to 40 V.

Features and Benefits

• Wide input voltage range: 5 to 40 V

• Maximum LED current of 120 mA

• TSSOP-16 (LP) package; exposed pad offers best-in-class thermal performance

• Typical LED accuracy of 0.5, and 0.5 for LED-to-LED matching

• Internal bias supply for single-supply operation (typically between VIN = 8 to 24 V)

• Integrated boost converter with 60 V DMOS switch with overvoltage protection (OVP)

• Drives up to 12 series LEDs in 2 parallel strings

• Single EN/PWM pin interface for both PWM dimming and enable function

• Sync function to synchronize boost converter switching frequencies up to 2.3 MHz, this gives the designer the ability minimize component size

• Provides driver for external PMOS input disconnect switch

• Protection features:

▫ Open or shorted VLED pin protection

▫ Open Schottky protection

▫ Cycle-by-cycle current limit

▫ Overtemperature protection (OTP)

▫ Output short circuit protection

Applications

• Desktop LCD flat panel displays (FPD)

• Flat panel video displays

• LCD TVs and monitors