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I am using IR2110 to drive a highside MOSFET which I intend to use to control the charging of a lithium ion battery (disconnecting it from the charger once full). I am not using any PWM control because the battery will be constantly charging. Just making the HIN pin of the IC high when I want to charge the battery and low when I want to disconnect the charger. Can H-bridge ICs work in this type of application where pwm is not involved or should I consider an alternative bootstrapping circuit? The diagram below shows my circuit. In my simulation, though the HIN voltage is constant, the output is oscillating. Please help me fix this.enter image description here

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  • \$\begingroup\$ For starters, Vboot won’t charge, so you need to supply your on floating voltage for it. Infineon has an app note for non PWM operation for IR2110/2113. \$\endgroup\$
    – winny
    Commented Apr 9, 2022 at 18:22
  • \$\begingroup\$ @winny pls send me the link \$\endgroup\$
    – p_karis
    Commented Apr 9, 2022 at 18:23
  • \$\begingroup\$ infineon.com/dgdl/… \$\endgroup\$
    – winny
    Commented Apr 9, 2022 at 18:26
  • \$\begingroup\$ @winny thank you \$\endgroup\$
    – p_karis
    Commented Apr 9, 2022 at 19:10

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This won't work in a DC application like yours because the bootstrap capacitor will discharge over time (microseconds), thus the high-side FETs will not remain on.

You could build a charge pump to maintain the bootstrap voltage, but it would be just as easy to use that to drive the FETs since you probably don't need the sub-us speed the PWM driver can operate at.

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  • \$\begingroup\$ thank you. Will look into the charge pump \$\endgroup\$
    – p_karis
    Commented Apr 9, 2022 at 19:11

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