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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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A8519KETTR-R Datenblatt(PDF) 1 Page - Allegro MicroSystems |
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A8519KETTR-R Datenblatt(HTML) 1 Page - Allegro MicroSystems |
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1 / 35 page  DESCRIPTION The A8519 is a multi-output 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 44 white LEDs, 11 LED per string, at 100 mA. The LED sinks can be paralleled together to achieve higher LED currents up to 400 mA. The A8519 operates from a single power supply from 4.5 to 40 V, which allows the part to withstand load dump conditions encountered in automotive systems. The A8519 can control LED brightness through a digital (PWM) signal. An LED brightness contrast ratio of 10,000:1 can be achieved using PWM dimming at 100 Hz; a higher ratio of 100,000:1 is possible when using a combination of PWM and analog dimming. Ifrequired,theA8519candriveanexternalP-channelMOSFET to disconnect input supply from the system in the event of a fault. The A8519 provides protection against output short, overvoltage, open or shorted diode, open or shorted LED pin, and overtemperature. A cycle-by-cycle current limit protects the internal boost switch against high-current overloads. A8519-DS, Rev. 7 FEATURES AND BENEFITS • Automotive AEC-Q100 qualified • Fully integrated 42 V MOSFET for boost converter • Fully integrated LED current sinks • Withstands surge input up to 40 VIN for load dump • Operates down to 3.9 VIN (max) for idle stop • Drives four strings of LEDs • Maximum output voltage 40 V Up to 11 white LEDs in series • Drive current for each string is 100 mA • Programmable boost switching frequency (200 kHz to 2.15 MHz) • Synchronized boost switching frequency option (260 kHz to 2.3 MHz) • Dithering of boost switching frequency to reduce EMI • Extremely high LED contrast ratio 10,000:1 using PWM dimming alone 100,000:1 when combining PWM and analog dimming Wide Input Voltage Range, High-Efficiency, Fault-Tolerant LED Driver Packages: Typical Application Diagram Not to scale A8519 and A8519-1 Continued on the next page… Continued on the next page… V> V OUT IN C IN C OUT1 C OUT2 C VDD R PU C P L1 Q1 D1 R ADJ R SC Optional C Z R Z R ISET V IN APWM AGND GND PGND VDD R OVP V C PWM LED4 LED1 OVP VIN GATE SW VOUT FAULT VSENSE R FSET CLKOUT ISET FSET A8519 LED2 LED3 COMP Typical Application Circuit Showing VOUT-to-Ground Short Protection Using Optional P-Channel MOSFET APPLICATIONS: • Automotive infotainment backlighting • Automotive cluster • Automotive center stack 28-Pin QFN with Exposed Thermal Pad (suffix ET) 20-Pin TSSOP with Exposed Thermal Pad (suffix LP) October 24, 2016 |
Ähnliche Teilenummer - A8519KETTR-R |
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Ähnliche Beschreibung - A8519KETTR-R |
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