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A8521 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A8521 Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 35 page  Figure 1. Application with VIN to ground short protection, using P-MOSFET sensing A8521-DS Features and Benefits • AEC-Q100 Qualified • Wide input voltage range of 5 to 40 V for start/stop, cold crank and load dump requirements • Fully integrated LED current sinks and boost converter with 60 V DMOS • Sync function to synchronize boost converter switching frequency up to 2.3 MHz, allowing operation above the AM band • Excellent input voltage transient response • Single resistor primary OVP minimizes VOUT leakage • Internal secondary OVP for redundant protection • LED current of 80 mA per channel • Drives up to 12 series LEDs in 4 parallel strings • 0.7% to 0.8% LED to LED matching accuracy • PWM and analog dimming inputs • 5000:1 PWM dimming at 200 Hz • Provides driver for external PMOS input disconnect switch • Extensive protection against: ▫ Shorted boost switch or inductor ▫ Shorted FSET or ISET resistor ▫ Shorted output ▫ Open or shorted LED pin ▫ Open boost Schottky ▫ Overtemperature (OTP) Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver Package: 20-pin TSSOP with exposed thermal pad (suffix LP) Typical Application Circuit Not to scale A8521 Continued on the next page… GATE SW Q1 D1 L1 CVDD OVP VOUT ROVP COUT RSC RADJ VSENSE VIN VDD PWM/EN APWM ISET FSET/SYNC AGND PGND COMP CP RZ CZ LED4 LED1 LED2 LED3 FAULT PAD A8521 150 Ω VC 10 μH 2 A / 60 V 137 kΩ 0.033 Ω 249 Ω 100 kΩ RISET 8.25 kΩ RFSET 10 kΩ 4.7 μF 50 V CIN 4.7 μF 50 V CC 22 nF RC 20 Ω 0.1 μF 0.47 μF 120 pF VIN 8 to 16 V Description The A8521 is a multi-output white LED driver for small-size LCD backlighting. It integrates a current-mode boost converter with internal power switch and four current sinks. The boost converter can drive up to 48 LEDs, 12 LEDs per string, at 80 mA. The LED sinks can be paralleled together to achieve even higher LED currents, up to 320 mA. The A8521 can operate with a single power supply, from 5 to 40 V, which allows the part to withstand load dump conditions encountered in automotive systems. TheA8521 can drive an external P-FET to disconnect the input supply from the system in the event of a fault. The A8521 provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pin, shorted boost switch or inductor, shorted FSET or ISET resistor, and IC overtemperature. A dual level cycle-by-cycle current limit function provides soft start and protects the internal current switch against high current overloads. The A8521 has a synchronization pin that allows PWM switching frequencies to be synchronized in the range of 580 kHz to 2.3 MHz. The high switching frequency allows the A8521 to operate above the AM radio band. Applications: LCD backlighting or LED lighting for: ▫ Automotive infotainment ▫ Automotive cluster ▫ Automotive center stack |
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