TIDM-02008: Recommended heat sink for TIDM-02008

Abdalla Saad

Part Number: TIDM-02008

The schematic demonstrate that a heat sink is required for Q100, Q101.
so what is the recommended heat sink for TIDM-02008 low-frequency MOSFET leg Q100, Q101?

over 5 years ago

0 John_K over 5 years ago

TI__Expert 4200 points

Hi,

The low frequency FETs do not need heatsink under the forced air cooling condition. Each FETs dissipate less than 2W under the full load condition.

The 'heatsink required' note was inserted in case the systems runs without a fan.

So you don't need the heatsink as long as your test set up follows the user's guide.

Best,

John

0 Abdalla Saad over 5 years ago in reply to John_K

Prodigy 125 points

Dear John,
Thank you for your response. So I won't use a heatsink as you advise, I have another query, If you allow me what is the need of the diode bridge in the Totem Pole Bridgeless topology
thanks in advance.
Abdalla.

0 John_K over 5 years ago in reply to Abdalla Saad

TI__Expert 4200 points

As you mentioned before, it is a bridgeless topology and low freq FETs are turned on and off during the PFC operation.

The diode bridge and relay are placed to deal with the inrush current.

Best,

John

0 Abdalla Saad over 5 years ago in reply to John_K

Prodigy 125 points

Alright I have understood thank you a lot have a nice day.

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TIDM-02008: Recommended heat sink for TIDM-02008