Gate-drive optocoupler for IGBT/MOSFET switching
The Toshiba TLP352(D4-TP1,F) is a single-channel optical coupling gate driver designed to drive IGBTs and power MOSFETs in isolated switch-mode power supplies, motor drives, and inverter stages. It delivers 2.5A peak output current with 2A symmetrical sink and source capability, enough to charge and discharge the gate of a medium-power IGBT without an external booster stage. The 3750Vrms isolation rating and 20kV/µs common-mode transient immunity (CMTI) let it sit on the secondary side of the isolation barrier while the primary-side controller commands switching events — the CMTI figure is the one that matters when the power stage commutates at high dv/dt and you need the driver to stay latched, not glitch the gate. Supply voltage range of 15V to 30V covers the typical gate-drive rails for silicon IGBTs and standard MOSFETs; the 1.55V typical forward voltage on the LED input side lets it interface directly with 3.3V or 5V logic through a series resistor.
3750Vrms isolation — where the barrier holds
The 3750Vrms isolation voltage is a reinforced-single-insulation rating suitable for mains-isolated applications up to 300V working voltage in pollution degree 2 environments. The 8-SMD gull-wing package with 8 mm creepage between input and output sides supports the clearance needed for safety-agency compliance. Approvals from CSA, cUL, UL, and VDE mean the part carries the marks accepted in North American and European safety-certified designs — no additional qualification testing for the isolation barrier in most industrial and commercial power supplies.
Switching timing and drive strength
The 50ns maximum pulse-width distortion means the on-time and off-time skew between input and output stays tight — relevant when you are paralleling multiple drivers and need matched gate signals. The 2.5A peak output rating is the headline number for driving the gate charge; the 2A symmetrical high/low current tells you the sink and source paths are balanced, so the turn-off speed matches the turn-on speed without extra gate-resistor asymmetry.
The 20 mA maximum LED forward current is the limit to watch when driving the input side from a logic output — size the series resistor to keep the LED current well below that ceiling across the temperature range.