DocID025572 Rev 1

5/19

AN4407

Description

19

Figure 3. Schematic of a push-pull driver for power device

A current amplifier solution can be integrated directly inside the driver or put in series with

the output driver externally. This solution is used on the demo board made by

STMicroelectronics. Since the L6563 driver used on the demo needs a sensing signal for

current control, a resistor is put in series with the source of the power device (Figure 4).

Figure 4. Schematic of a push-pull connection usingan L6536 as the driver

This solution necessitates a slight modification on the driving network to correctly use the

new device with the added sensing pin. In fact, if we directly replace the standard 3-pin TO-

247 MOSFET with the 4-pin version (TO-247-4), we risk short-circuiting the sensing resistor

and losing any information coming from it (Figure 5).

GIPG211120131731FSR

GIPG211120131734FSR