AOZ1083 데이터 시트보기 (PDF) - Alpha and Omega Semiconductor

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AOZ1083

2A Simple Buck Regulator

Alpha and Omega Semiconductor 

AOZ1083

The actual junction temperature can be calculated with

power dissipation in the AOZ1281 and thermal

impedance from junction to ambient.

Tjunction

= (Ptotal_loss–Pdiode_loss–Pinductor_loss) × ΘJA

+ Tamb

The maximum junction temperature of AOZ1083 is

150 ºC, which limits the maximum load current capability.

The thermal performance of the AOZ1083 is strongly

affected by the PCB layout. Care should be taken during

the design process to ensure that the IC will operate

under the recommended environmental conditions.

Several layout tips are listed below for the best electric

and thermal performance.

1. The input capacitor should be connected as close as

possible to the VIN pin and the GND pin.

2. The inductor should be placed as close as possible

to the LX pin and the output capacitor.

3. Keep the connection of schottky diode between the

LX pin and the GND pin as short and wide as

possible.

4. Place the feedback resistors and compensation

components as close to the chip as possible.

5. Keep sensitive signal traces away from the LX pin.

6. Pour a maximized copper area to the VIN pin, the

LX pin and especially the GND pin to help thermal

dissipation.

7. Pour copper plane on all unused board areas and

connect the plane to stable DC nodes, like VIN, GND

or VOUT.

Rev. 1.0 July 2011

www.aosmd.com

Page 9 of 12

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