Allegro's A8513 is a single-output white LED (WLED) driver for LCD backlighting. It integrates a current-mode boost converter with an internal power switch and one current sink. The A8513 can operate from a single 4.5 to 40 V power supply to accommodate start/stop, cold crank, and load dump requirements. A 2 MHz boost converter switching frequency allows the A8513 to operate above the AM radio band. If required, the fault flag can be used as part of a circuit to drive an external P-FET to disconnect the input supply from the system in the event of a fault. The A8513 provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pins, shorted boost switch or inductor, shorted ISET resistors, and IC over-temperature. A dual level cycle-by-cycle current limit function provides soft start and protects the internal current switch against high current overloads.
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- Wide input voltage range of 4.5 to 40 V for start/stop, cold crank and load dump requirements
- Boost converter switching frequency up to 2 MHz, allowing operation above the AM band
- Excellent input voltage transient response
- Internal secondary OVP for redundant protection
- Fully integrated LED current sink and boost converter with 60 VDC MOSFET
- Maximum LED current of 150 mA
- Drives up to 14 series LEDs
- Single EN/PWM pin interface for PWM dimming and enable function
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- Fault flag pin to alert the controller to a myriad of possible fault conditions
- Protection features:
- Shorted output
- Open or shorted LED pin
- Output under-voltage and over-voltage
- Input under-voltage
- Shorted boost switch or inductor
- Shorted ISET resistor
- Open boost Schottky
- Over-temperature
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| Applications |
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- LCD backlighting for:
- Automotive infotainment
- Automotive cluster
- Automotive center stack
- Industrial LCD displays
- Portable DVD players
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- LED lighting
- Flatbed scanners
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Allegro's A8513 is a single-output white LED (WLED) driver for LCD backlighting. It integrates a current-mode boost converter with an internal power switch and one current sink. The A8513 can operate from a single 4.5 to 40 V power supply to accommodate start/stop, cold crank, and load dump requirements. A 2 MHz boost converter switching frequency allows the A8513 to operate above the AM radio band. If required, the fault flag can be used as part of a circuit to drive an external P-FET to disconnect the input supply from the system in the event of a fault. The A8513 provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pins, shorted boost switch or inductor, shorted ISET resistors, and IC over-temperature. A dual level cycle-by-cycle current limit function provides soft start and protects the internal current switch against high current overloads.
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