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AOZ1950

Alpha & Omega Semiconductors
Part Number AOZ1950
Manufacturer Alpha & Omega Semiconductors
Description Boost Regulator White LED Driver
Published May 19, 2016
Detailed Description AOZ1950 Boost Regulator White LED Driver General Description The AOZ1950 is a high-efficiency boost regulator with inte...
Datasheet PDF File AOZ1950 PDF File

AOZ1950
AOZ1950

Overview
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.
The AOZ1950 works from a 2.
7V to 5.
5V input voltage range supporting a wide range of applications.
Other 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 nominal OFF pulse z 300mV feedback regulation z Analog dimming via DIM pin z PWM dimming via EN pin z Cycle-by-cycle current limit z Short circuit protection switch z Open LED over-voltage protection z Thermal shutdown protection z Internal soft-start z Small 3mm x 3mm DFN package Applications z Portable DVD Players z GPS Systems z Smart Phones z Sub Notebook PC Typical Application L1 22μH VIN 2.
7V-5.
5V R1 1.
5kΩ C3 22nF C1 4.
7μF IND VIN LX VOUT AOZ1950 DIM PGND AGND EN COMP C4 1nF FB C2 0.
47μF R2 15Ω Rev.
1.
0 January 2010 www.
aosmd.
com Page 1 of 14 Ordering Information ...


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