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Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

A8515

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A8515 ECAD Model
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Description

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Packaging

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.

PWM dimming is implemented with an external PWM input signal. The PWM dimming pin is used to control the LED intensity by using pulse width modulation.

The low, 720 mV regulation voltage on the LED current sources reduces power loss and improves efficiency.

Applications include:

  • Desktop LCD flat panel displays (FPD)
  • Flat panel video displays
  • LCD TVs and monitors

The A8515 is provided in a 16-pin TSSOP package (suffix LP) with an exposed thermal pad. It is lead (Pb) free, with 100% matte tin leadframe plating.

  • 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 PWM pin interface for both PWM dimming and enable function
  • Sync function to synchronize boost converter switching frequencies up to 2.25 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

The A8515 is provided in a 16-pin TSSOP package (suffix LP) with an exposed thermal pad. It is lead (Pb) free, with 100% matte tin leadframe plating.

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