Mosfet Snubber Circuit in Flyback Converter Circuit

Mosfet Protection in flyback Circuit

PKC-136

PEAK CLAMP

CHARACTERISTICS
VBR 160Vdc
VDRM 700Vdc
P 1.5W

Feature
- Protection of the Mosfet in flyback power supply
- TRANSIL™ and blocking diode in a single
package

BENEFITS

- Accurate voltage clamping regardless load
- Reduced current loop
- Reduced EMI emission
- High integration
- Fast assembly
- Reduced losses in stand by mode

PKC-136 datasheet pdf


Mosfet Snubber Circuit in Flyback Converter

Fig. 1 Typical flyback convertor with drain clamping circuits

ZenBlock
Zener with integrated blocking diode
Philips Semiconductors' new ZenBlockTM replaces
double-diode-, RCD- or RC-snubbers in flyback convertors.
The new components offer circuit designers the important
benefits of lower component count and board usage, reduced
EMI, optimal clamping at all loads and higher efficiency.

Introducing

The new ZenBlock combines the double diode snubber in one
package. This leads to the following advantages:
-Fewer components.
-Reduced circuit board space
-Lower EMI by reducing the drain clamp circuit length and
area.
-Optimal clamp performance at all loads (compared with RCD
and RC snubber)
-Higher efficiency at low loads (compared with RCD and RC
snubber)

ZenBlock datasheet pdf