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LM2734: output load capacity is very low

Kevin Xiong
Expert 2340 points
Part Number: LM2734

Hi,

I'm using LM2734 to design a power supply. The input voltage is 9V and the output voltage is 3.3V. When there is no any load, the output voltage is 3.3V. But when I connect 3 LEDs (about 10mA) to the output, the output voltage diminishes to 2V. I refered to the application on page 25 in the datasheet. Please refer to my schematic as attachment.

Could you please help to check my schematic? Is there any problem?

Thanks.

Kevin Xiong

  • 0
    TI__Expert 6860 points
    Kevin ,

    Here is my review of the schematic :

    1. Add a bulk input capacitor . Use 4.7uF/25V or higher value cap.
    2. The output cap chosen has very high ESR and may impact the closed loop performance of this device . Use 22uF , 6.3V cermaic cap (X5R or X7R)

    also how are you controlling the LED current ?

    ---Ambreesh