Heat generation from CYPD3177

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ToHo_4356766
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Hi

I am evaluating CYPD3177.

In case of 5V and 9V PDO, CYPD3177 is not so hot.

However, in case of 12V PDO, CYPD3177 is a little hot.

Furthermore, in case of 20V PDO, CYPD3177 is hot how I can not touch.

Is it a regular spec?

Best

Tomo

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Hi Tomo,

I have confirm it on my end with CY4533, there are is not hot to cannot touch. Refer attached PD log I tested.I tested 5V, 9V, 12V, 15V, and 20V.

Best Regards,

Lisa

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ShifangZ_26
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Hi Tomo,

1. Are you attached a load on J3 or not?

2. Could you please kindly share temperature of you mentioned about "hot", "little hot" and " not so hot"?

3. Typically, CYPD3177 is power consumption within 50mW with active mode.

4. The hot source shall be Q1, Q3, Q4, D1, D2, D3.

Best Regards,

Lisa

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ToHo_4356766
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Hi Lisa

Answeres are...

1. No load on J3

2. In case of 5V and 9V PDO, CYPD3177 is not hot.

In case of 12V PDO, CYPD3177 is a little hot how I can touch it. I think it is a normal hot generation from any ICs.

However, in case of 20V PDO, CYPD3177 is so hot how I can not touch. Also CYPD3177 is turned off because of thermally protection.

Best

Tomo

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Hi Tomo

Could you please share the CC log of 20V contract you tested to me? If you have CY4500, the .ccgx format is fine.

Are you using CY4533 for testing? Or you are using the board you have been customized? 

Are you using VBUS_MAX, VBUS_MIN, ISINK_COARSE, and ISINK_FINE for sink PDO requesting? Or you are using BCR HPI to set Sink PDO requesting? Is the Request on the CC log match you are setting?

May I know what the trigger temperature of thermally protection?

Best Regards,

Lisa

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ToHo_4356766
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Hi Lisa

Thank you for your kind assistance.

I do not have CY4500 so that I can not check the cc log.

However, the requested voltage is surely applied at VBUS.

The board is original one. I show the partial circuit below. (VCC is 3.3V)

cir.jpg

I confirmed the new thing.

First, VR1 is set to PDO of 20V , then I connected the power bank. It does not generate the heat.

However, first VR1 is set to PDO of 5V, then I connected the power bank, furthermore I changed VR1 to PDO of 20V. it generate the heat.

It seems that the changing PDO voltage when chip is working generate the heat.

Best

Tomo

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Hi Tomo,

I have confirm it on my end with CY4533, there are is not hot to cannot touch. Refer attached PD log I tested.I tested 5V, 9V, 12V, 15V, and 20V.

Best Regards,

Lisa