The A80601 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-MOSFET. This allows greater output power even at minimum supply voltage.
The A80601 provides four integrated current sinks driving up to 210 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 A80601 can control LED brightness through 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.
Switching frequency can be externally synchronized or programmed between 200 kHz and 2.3 MHz. This allows operation either above or below the AM band. A programmable dithering feature further reduces EMI. A Clock-Out is provided for other converters to sync to the A80601.
The A80601 provides protection against output short, overvoltage, open- or shorted-LED pin, and overtemperature. A cycle-by-cycle current limit protects the external boost switch against high current overloads. An external P-MOSFET can optionally be used to disconnect input supply in case of output to ground short fault. The A80601-1 is similar to A80601 except it adopts ‘One-Out-All-Out’ fault handling.
Featured Applications include:
- Automotive infotainment backlighting
- Automotive heads-up display
- Automotive interior and exterior lighting