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A80603

Allegro
Part Number A80603
Manufacturer Allegro
Description LED Driver
Published Dec 6, 2023
Detailed Description A80603 and A80603-1 LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple FEATURES AND ...
Datasheet PDF File A80603 PDF File

A80603
A80603


Overview
A80603 and A80603-1 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 • Fully integrated LED current sinks and boost converter with internal power MOSFET • Operate in Boost or SEPIC mode for flexible output • Drives up to 11 series white LED in 4 parallel strings, at up to 120 mA per string (VF = 3.
3 V max).
• Boost switching frequency synced externally or programmed from 260 kHz to 2.
3 MHz • Clock-Out feature for internal switching frequency • Adjustable 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: 24-Pin 4 mm × 4 mm QFN with Wettable Flank Not to scale DESCRIPTION The A80603 and A80603-1 are multi-output LED drivers that integrate a current-mode boost converter with an internal power switch and four current sinks.
The boost converter can drive four strings of LEDs at up to 120 mA, or LED sinks can be paralleled together to achieve higher currents up to 480 mA total.
The devices operate from single power supply from 4.
5 to 40 V; once started, they can continue to operate down to 3.
9 V.
This allows the parts to withstand stop/start, cold crank, and load dump conditions encountered in automotive systems.
By using patented Pre-Emptive Boost control, an LED brightness contrast ratio of 15,000:1 can be achieved using PWM-only dimming at 200 Hz.
Higher ratios are possible when using a combination of PWM and analog dimming.
Switching frequency can be either above or below the AM band, set by either a resistor or the synchronization pin to between 260 kHz and 2.
3 MHz.
A programmable dithering feature ...


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