TSS721A: trouble with the vdd pin

Egor Karlin

Part Number: TSS721A

Hello!

We have a problem with output VDD of TS721A. We got voltage on the VDD pin 2.2V. Why?

RRIDD=30k, RRIS=100, CSTC=47uF, CSC=220nF

over 6 years ago

0 Eddie LaCost over 6 years ago

TI__Mastermind 45155 points

Hello Egor,

Do you have a load on the VDD pin when you see 2.2V? If so, it could be that your load is pulling too much current dragging the voltage down. You could try a larger capacitor on Cstc.

0 Egor Karlin over 6 years ago in reply to Eddie LaCost

Intellectual 690 points

We don't have a load on the VDD pin. Voltage on the STC pin 3.9 V, so VDD is off. How to increase the voltage VSTC?

0 Eddie LaCost over 6 years ago in reply to Egor Karlin

TI__Mastermind 45155 points

Egor,

Is your bus voltage within the minimum and maximum ranges shown on page 8 of the datasheet? If so, have you also tried using the values shown in figure 7 of the datasheet?

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TSS721A: trouble with the vdd pin