A8511GLPTR-T

• Product introduction

A8511is a multi-output WLED/RGB designed for mid-size display backlightingdrive。 It is a fully integrated high-brightness (HB) LED driver solution that meets backlight design standards without the need for an external power supply. The A8511 integrates FETs for boost converters and four 150 mA current converters to provide a complete comprehensive solution at the HB LED current level. LED channels can be combined with each other to support up to 600mA current sink capability. The device operates from a single supply of 6.8 to 21 V and can withstand voltages up to 40 V. The boost converter is a constant-frequency, current-type converter.

The operating frequency can be set to 2 MHz to avoid interference in the AM band. The integrated boost DMOS switch is rated at 40 V at 3.6 A. PWM dimming control enables LED current control with ratios up to 1000:1. Additional 4:1 light and dark control is available by using the DIM pin.

The A8511 provides output connector short-circuit protection through an integrated output disconnect switch. An optional external thermistor can be used to limit LED current based on panel temperature.

The device is available in a surface-mount, 28-pin TSSOP package (suffix LP) with an exposed heatsink plate for enhanced cooling. The package is lead (Pb) free and features 100% matte tin leadframe plating.

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• GPS navigation system
• Car infotainment
• Backup camera display
• Cluster backlight
• Portable DVD player
• Industrial LCD display
• • 4 LED converters, each rated at 150 mA (600 mA total)
  • Boost converter with 40 V DMOS switch and OVP load dump protection
  • 600 kHz to 2.2 MHz switching frequency - operates above the AM band
  • Provides an internal bias supply (V) for single-supply operation_IN = 6.8 to 21 V)
  • 3.5 μA shutdown current - limits battery consumption
  • Active current sharing between LED strings with 0.8% current matching and 0.7% accuracy
  • PWM light and dark control with LED duty cycle control
  • 4000:1 light and dark range
  • Wide range of failure mode protection schemes:
    • Short-circuit LED protection against misconnection of loads - with true output disconnection
    • Open LED disconnect protection against LED failure
    • An external thermistor senses to limit the LED temperature
    • Output overvoltage protection (OVP): 19.5 V default, adjustable up to 38 V
    • Open Schottky and open OVP resistor protection against external component failure
    • Input undervoltage and overvoltage protection (UVLO and OVLO) to prevent V_INvariation
    • Boost current limit, output short-circuit limit, overtemperature protection (OTP), soft-start