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A80605-1

Allegro
Part Number A80605-1
Manufacturer Allegro
Description High Power LED Driver
Published Dec 6, 2023
Detailed Description A80605 and A80605-1 High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple FE...
Datasheet PDF File A80605-1 PDF File

A80605-1
A80605-1


Overview
A80605 and A80605-1 High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple FEATURES AND BENEFITS • Automotive AEC-Q100 qualified • Enhanced fault handling for ASIL B system compliance • Wide input voltage range of 4.
5 to 40 V for start/stop, cold crank, and load dump requirements • Operate in Boost or SEPIC mode for flexible output • Gate driver for external MOSFET to deliver higher output power • Six integrated LED current sinks, up to 140 mA each • Boost switching frequency synced externally or programmed from 260 kHz to 2.
3 MHz • Programmable boost frequency dithering to reduce EMI • Advanced control allows minimum PWM on-time down to 0.
3 µs, and avoids MLCC audible noises • LED contrast ratio: 15,000:1 at 200 Hz using PWM dimming alone, 150,000:1 when combining PWM and analog dimming Continued on next page.
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PACKAGE: Not to scale 24-Pin 4 mm × 4 mm QFN with Wettable Flank DESCRIPTION The A80605 is a multi-output LED driver for automotive applications such as exterior lighting, heads-up display, and mid-size LCD backlighting.
It implements a current-mode boost/SEPIC converter with gate driver for external N-channel MOSFET.
The A80605 provides six integrated current sinks driving up to 140 mA per string.
Multiple sinks can be paralleled together to achieve higher LED currents up to 840 mA.
The IC operates from single power supply from 4.
5 to 40 V; once started, it can continue to operate down to 4 V.
This allows it to withstand stop/start, cold crank, and load dump conditions encountered in automotive systems.
The A80605 can control LED brightness through an external PWM signal.
By using the patented Pre-Emptive Boost control, an LED brightness contrast ratio of 15,000:1 can be achieved using PWM dimming at 200 Hz.
A higher ratio of 150,000:1 is possible when using a combination of PWM and analog dimming.
Continued on next page.
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APPLICATIONS • Automotive infotainment backlighting • Automotive heads-up display • Auto...


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