10 October 2018
Power Electronics / Power Management
Allegro MicroSystems has announced the release of the ALT80802, its latest addition to the family of 62xx/808xx LED drivers for lighting. The ALT80802 addresses a key market trend of 3 to 4 white LEDs in a single string powered from a 12 V battery input, which is very desirable for fog, backup, DRL, side mirror and other automotive lighting applications.
The device can meet this requirement with a solution that provides 2 MHz operation, enhanced performance in PWM dimming capability and fault protection, reducing the external component count. Furthermore, it can be operated in buck mode up to 2 A, to drive 1 or 2 LEDs from the battery or up to 12 LEDs from a pre-boost supply.
The ALT80802 is a high-frequency switching regulator that provides constant output current to drive high-power LEDs. It is designed to aid in EMC/EMI design by frequency dithering, soft freewheel diode turn-off, and well controlled switch node slew rates.
A programmable oscillator allows the device to switch up to 2,5 MHz, outside EMI-sensitive frequency bands such as the AM band. It integrates a power MOSFET for step-down (buck) or inverting buck-boost conversion. The 50 V-rated Enable pin can be tied to VIN for automatic startup, to support battery-level PWM dimming common in legacy body controllers. The wide input range of 3,8 to 50 V makes the ALT80802 highly flexible.
With current-mode control and simple external compensation, the ALT80802 can achieve fast transient response. The control loop of the ALT80802 is designed for PWM dimming operation to achieve low dimming on-time, low turn-on overshoot, accurate PWM duty cycle, and wide dimming range.
Extensive protection features of the ALT80802 include pulse-by-pulse current limit, hiccup mode short circuit protection, open/short freewheeling diode protection, BOOT open/short voltage protection, VIN under-voltage lockout, and thermal shutdown.
The ALT80802 is AEC-Q100 automotive qualified and is available in a small 10-pin DFN package with thermal pad and wettable flank.
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