| Electronics > Beginners |
| Understanding the IR2110 half bridge driver |
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| ZeroResistance:
I want to use the IR2110 to drive a half bridge the bridge voltage would be around 100V. The mosfet gate drive voltage (Vcc) is 15V. I would not want to use the bootstrap capacitor here. So just want to understand what external voltage level should I provide to the Vb pin. And is it okay to have that voltage source referenced to the COM / VSS pin. |
| T3sl4co1l:
The bootstrap source goes between Vb and Vs, where the bootstrap capacitor would go. Why not bootstrap? Intermittent or slow switching? Tim |
| MagicSmoker:
--- Quote from: ZeroResistance on April 05, 2019, 02:55:51 pm ---I want to use the IR2110 to drive a half bridge the bridge voltage would be around 100V. The mosfet gate drive voltage (Vcc) is 15V. I would not want to use the bootstrap capacitor here. So just want to understand what external voltage level should I provide to the Vb pin. And is it okay to have that voltage source referenced to the COM / VSS pin. --- End quote --- I really don't like bootstrap driver ICs and haven't used one in years, but, in general, you can supply Vboot directly and dispense with the diode and capacitor charge pump as long as you use an isolated power supply to do so. Note, however, that once you've gone to the trouble of using an isolated supply you might as well go all the way and make a proper floating high side driver. |
| ZeroResistance:
--- Quote from: MagicSmoker on April 05, 2019, 05:14:08 pm --- --- Quote from: ZeroResistance on April 05, 2019, 02:55:51 pm ---I want to use the IR2110 to drive a half bridge the bridge voltage would be around 100V. The mosfet gate drive voltage (Vcc) is 15V. I would not want to use the bootstrap capacitor here. So just want to understand what external voltage level should I provide to the Vb pin. And is it okay to have that voltage source referenced to the COM / VSS pin. --- End quote --- I really don't like bootstrap driver ICs and haven't used one in years, but, in general, you can supply Vboot directly and dispense with the diode and capacitor charge pump as long as you use an isolated power supply to do so. Note, however, that once you've gone to the trouble of using an isolated supply you might as well go all the way and make a proper floating high side driver. --- End quote --- 1. So, the supply has to isolated?? I did miss that. 2. Like you said you don't like the bootstrap driver IC's which one's do you prefer and can you provide a few part numbers. 3. What is a proper floating high side driver? |
| ZeroResistance:
--- Quote from: T3sl4co1l on April 05, 2019, 04:48:08 pm ---The bootstrap source goes between Vb and Vs, where the bootstrap capacitor would go. Why not bootstrap? Intermittent or slow switching? Tim --- End quote --- Yes, its kind of intermittent, Is there any way to simulate a IR2110, LTSpice perhaps?? |
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