AN2123 STMicroelectronics, AN2123 Datasheet - Page 2

• Manufacturer Part Number: AN2123
• Description: TD351 Advanced IGBT Driver Principles of operation and application
• Manufacturer: STMicroelectronics

TD351 application example
Figure 2. IGBT modules
2 TD351 application example
A TD351 application example is shown in
isolated voltage source. An optocoupler is used for input signal galvanic isolation. The IGBT is driven by
44Ω for turn-on and 22Ω for turn-off thanks to the use of two gate resistors and one diode: sink and
source currents can therefore be tuned independently to help and solve EMI issues. Power switch drivers
are used in very noisy environment and decoupling of the supplies should be cared. In the application
example the decoupling is made by a 100nF ceramic capacitor located as close as possible to the TD351
in parallel with a bigger electrolytic capacitor.
Figure 3. TD351 application example
2/15
100pF
4K7
10nF
470pF
16K
10K
11V
VH
Figure
1
2
3
4
IN
VREF
CD
LVOFF
3. In this example the device is supplied by a +16V
TD351
CLAMP
OUT
VH
VL
8
7
6
5
22Ω
100nF
16V
22Ω
AN2123