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AOZ1950 - Boost Regulator White LED Driver

Description

The AOZ1950 is a high-efficiency boost regulator with internal 60V MOSFET and input protection switch.

The part is designed to drive up to twelve white LEDs in series.

The AOZ1950 supports two dimming control methods: analog dimming and PWM dimming.

Features

  • include cycle-by-cycle current limit, Input voltage short circuit protection switch, open-LED over-voltage protection, input under-voltage lockout, thermal shutdown and soft-start. The AOZ1950 is available in a tiny 3mm x 3mm 10-pin DFN package and is rated over a -40°C to +85°C operating temperature range. Features z 2.7V to 5.5V input voltage range z 60V/350mΩ internal N-channel MOSFET z Drives up to 12 White LEDs z 800kHz typical switching frequency with adaptive pulse width control z 150ns.

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Full PDF Text Transcription

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AOZ1950 Boost Regulator White LED Driver General Description The AOZ1950 is a high-efficiency boost regulator with internal 60V MOSFET and input protection switch. The part is designed to drive up to twelve white LEDs in series. The AOZ1950 supports two dimming control methods: analog dimming and PWM dimming. In analog dimming mode, the LED current can be linearly adjusted for ±12% with a DC voltage on DIM pin. In PWM dimming mode, the LEDs can be turned on and off by toggling EN pin with a square wave, and the brightness is proportional to the duty cycle of the control signal. AOZ1950 is a fixed OFF pulse regulator with adaptive pulse width as a function of input and output voltage. Typical switching frequency is 800kHz. This allows the use of low-profile inductor and capacitors.
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