AN2123 Datasheet, PDF (1/15 Pages) STMicroelectronics – Principles of operation and application

AN2123
Application Note
1 Introduction
TD351 Advanced IGBT Driver
Principles of operation and application
by Jean-François GARNIER & Anthony BOIMOND
The TD351 is an advanced IGBT driver with integrated control and protection functions. It is a simplified
version of the TD350, available in an SO8 or DIP8 package. The TD35x family (including the TD350,
TD351 and TD352) provides a wide range of drivers specially adapted to drive 1200 V IGBTs with current
ratings of 15 to 75 A in Econopak-like modules (see Figure 2).
The main features of the TD351 are:
- 1 A sink/0.75 A source peak output current minimum over the full temperature range (-20°C to
125°C),
- active Miller clamp function to reduce the risk of induced turn-on in high dV/dt conditions, and in
most cases, without requiring a negative gate drive,
- optional 2-step turn-off sequence to reduce over-voltage in case of an over-current or a short-
circuit situation; a feature that protects the IGBT and avoids RBSOA problems,
- input stage compatible with both an optocoupler and a pulse transformer.
Applications include three-phase full-bridge inverters such as in motor speed control and UPS systems
(see Figure 1).
Figure 1. TD351 in 3-phase inverter application (1200 V IGBTs)
High-side power
supply
or
Bootstrap
Circuitry
TD351
TD351
Phase 1
TD351
Phase 2
V+ DCbus
Phase 3
Low-side power
supply
TD351
TD351
TD351
V- DCbus
AN2123/0205
Revision 1
1/15