PWM controller + gate driver (UC3843)
PWM controller (UC3843 class) with a low-side and a floating high-side gate driver · 20 kHz · fixed duty 40 % · 12 V supply
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Pins
- VCC (12 V)
- GND
- LO (gate, low side)
- HO (gate, high side)
- HS (high-side source)
- FB (feedback, 1.25 V)
Ratings and limits
| Supply | 10–20 V |
|---|---|
| Frequency | 20 kHz |
| Gate drive | 12 V, 8 Ω |
| Reference | FB regulates to 1.25 V |
How to use it
Builds a buck or boost from parts: drive a MOSFET with LO (low side) or HO/HS (high side), close the loop with a divider into FB.
Lessons and builds that use it
- Buck converter from parts
- Boost converter from parts
- SEPIC: output above and below the input
- Fault-finding a switch-mode output