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A8521 Datasheet(PDF) 4 Page - Allegro MicroSystems |
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A8521 Datasheet(HTML) 4 Page - Allegro MicroSystems |
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4 / 35 page  Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver A8521 4 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Functional Block Diagram VDD Regulator UVLO Internal Soft Start Enable PWM Thermal Shutdown Open/Short LED Detect ISET Fault LED Driver 1.235 V Ref Driver Circuit Internal VCC Internal VCC VREF Internal VCC VREF VREF ISS ISS IADJ GOFF 100 kΩ AGND Current Sense Input Current Sense Amplifier PMOS Driver Diode Open Sense OVP Sense Oscillator SW VIN FSET/SYNC COMP VSENSE GATE PWM/EN APWM PAD PGND AGND ISET OVP LED4 LED1 LED2 LED3 FAULT AGND PGND ∑ Fault Fault Fault |
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