A8501ELPTR-T

• Product introduction

A8501is a multiplex WLED/RGB designed for backlit mid-size displaysdrive。 The A8501 includes a boost converter and four incoming current sources. Operates from a single supply of 8 to 21 V and withstands voltages up to 40 V.

The boost converter is a constant frequency current mode 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 supports LED current control at a 1000:1 ratio. Other 4:1 light and dark control sections are obtained by using DIM pins.

The A8501 provides output terminal short-circuit protection through an integrated output shutdown switch. An optional external thermistor can be used to limit LED current based on panel temperature.

The unit is available in a surface-mount, 28-pin TSSOP package (suffix LP) with exposed thermal pads for enhanced heat dissipation. The packaging is lead-free and 100% matte tin plating.

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• Navigation system
• Automotive infotainment system
• • Active current sharing between tightly matched LED strings and accuracy
  • Drives up to 9 serial, 4 parallel series, 36 LEDs maximum (Vf = 3.5 V, If = 100 mA)
  • Boost converter with integrated 40 V DMOS
  • The LED sink current rating is 100 mA
  • Typical LED matching error
  • PWM light and dark control with LED duty cycle control
  • 4000:1 light and dark range
  • 600 kHz to 2.2 MHz switching frequency
  • The open LED is disconnected
  • LED short-circuit protection
  • Internal bias supply for a single supply
  • An external thermistor senses the LED temperature limit
  • Boost current limit, output circuit limit, overtemperature protection (OTP), soft-start
  • Output overvoltage protection
  • Turn on Schottky barrier diode and OVP resistor protection
  • True output disconnects
  • Undervoltage and Overvoltage Protection Inputs (UVLO and OVP)