What Is the HCPL3120? Isolated IGBT/MOSFET Gate Driver and Uses
The HCPL-3120 is an isolated IGBT/MOSFET gate-driver optocoupler. While isolating control from power it supplies 2.5 A peak current to drive the power switch; it is very similar to the TLP250. It is used for isolated gate driving in motor drives, inverters and SMPS. Pinout DIP-8: Anode(2)/Cathode(3), VEE(5), VO(6-7), VCC(8). A current-limiting resistor on the input LED is a must.
The HCPL-3120 is an isolated IGBT/MOSFET gate-driver optocoupler. While isolating control from power, it supplies 2.5 A peak current to drive the power switch. It is very similar to the TLP250. For the concept, see what is a gate driver · what is an optocoupler.
What is the HCPL3120 used for?
Isolated (including high-side) IGBT/MOSFET driving in motor drives, inverters and SMPS. Thanks to optocoupler isolation, the high-voltage power stage and the logic stage are electrically separated.
HCPL3120 pinout (DIP-8)
| Pin | Function |
|---|---|
| 1 | NC |
| 2 | Anode (LED +) |
| 3 | Cathode (LED −) |
| 4 | NC |
| 5 | VEE (output negative supply) |
| 6 | VO (output) |
| 7 | VO (output) |
| 8 | VCC (output positive supply) |
Watch out
A current-limiting resistor on the input LED is a must. The output-side supply (VCC-VEE) must suit the gate voltage (e.g. +15/−8 V bipolar for an IGBT); a decoupling capacitor is needed.
Equivalents
- TLP250: a very similar isolated gate-driver optocoupler.
- HCPL-3180: a higher-current version.
- 1EDI series: modern isolated gate drivers.
Find it in our catalog
Use the HCPL3120 search.