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.
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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\$– winnyApr 9, 2022 at 18:22
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\$\begingroup\$ @winny pls send me the link \$\endgroup\$– p_karisApr 9, 2022 at 18:23
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\$\begingroup\$ infineon.com/dgdl/… \$\endgroup\$– winnyApr 9, 2022 at 18:26
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\$\begingroup\$ @winny thank you \$\endgroup\$– p_karisApr 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_karisApr 9, 2022 at 19:11