Undervoltage lockout for small-power MOSFET gate driver


Posted on Feb 5, 2014

Developing a battery switch-over circuit which is made of two lanes of the depicted circuit. Operation voltage range is from 3V. 12V. Only one lane should be enabled at a time which is governed by logic not included in the schematic. Each lane can (dis)connect its battery (V+) by means of two back-to-back p-MOSFETs (Vg, th = 1. 5V). The drivers


Undervoltage lockout for small-power MOSFET gate driver
Click here to download the full size of the above Circuit.

and switch-over circuitry are powered by Vs which is derived by OR-ing all batteries via diodes. Now I am concerned over the case when the Vs voltage falls below around 3V which comes close to the MOSFETs safe (2x Vg, th) gate threshold voltage and the TLC3702 comparator minimum operating voltage.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    ALTIUM DESIGNER
    Simple high-volt supply
    Ssb Generators
    Adjustable Regulated Power Supply 0-15V
    Mobile Bug Detector
    Battery circuit
    Schematic Diagram Schema HO Train Model Lighthouse Flasher
    Low pass filter for subwoofer
    LED Lighting For Consumer Unit Cupboard
    9V fm transmitter circuit design using transistors
    Using AD9835 DDS chip with BASIC-52
    AD1865 based audio DAC with I2S input and voltage output
    Inexpensive frequency counter tachometer
    Lights Out circuit
    Multifunction Passive 7400 RFID Tag



    Top