CYPD3177 P MOSFET

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Augustine_Yeh
Level 4
Level 4
Distributor - Zenitron(GC)
100 sign-ins 5 likes given 50 sign-ins

Hi Infineon

Why CYPD3177 sink path need two P MOSFET, Can we use one P MOS for it, Thanks!!

 

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Pranava_YN
Moderator
Moderator
Moderator
100 likes received 500 replies posted 250 solutions authored

Hi,

The back-to-back FETs are required to avoid reverse current that will flow in the backward direction from the load to source through the parasitic diode (body diode) of the MOSFET. The body diodes prevent this current in backward direction when FETs are off.

However you can evaluate your system and use 1 FET instead of 2. For example, if you are using BCR to directly charge a battery (VBUS connected to battery), then there is a high chance that in OFF state there is a reverse current. So, its recommended to use back to back FETs in such scenario.

Best regards,
Pranava

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Pranava_YN
Moderator
Moderator
Moderator
100 likes received 500 replies posted 250 solutions authored

Hi,

The back-to-back FETs are required to avoid reverse current that will flow in the backward direction from the load to source through the parasitic diode (body diode) of the MOSFET. The body diodes prevent this current in backward direction when FETs are off.

However you can evaluate your system and use 1 FET instead of 2. For example, if you are using BCR to directly charge a battery (VBUS connected to battery), then there is a high chance that in OFF state there is a reverse current. So, its recommended to use back to back FETs in such scenario.

Best regards,
Pranava
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