- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
TPS63020 Circuit was designed to output 3.9V where it needs less than 100mA average current and 2A peaks for milliseconds. (GSM Application)
I followed 3 Circuit Steps
Step A:
Input Capacitors 10uF (X5R) * 2
Output Capacitors 22uF (X5R) * 3
Power Supply was Tenma 72-10480 Bench Top Power Supply. Input Voltage 3 to 5V, Max Current Allowed 3A.
Worked Fine for 18 Hours.
When removing 1000uF electrolytic capacitor of GSM Supply point it start malfunctioning. It shows a high current draw. No output voltage. Seem to be it is a Hiccup type. IC got abnormally heated.
Step B:
Input Capacitors 10uF (X5R) * 1
Output Capacitors 22uF (X5R) * 1
Worked GSM/GPRS Fine for 1-2 Hours.
I wrongly connect 6V Power supply to the input. It start malfunctioning same as last case.
My problem is the Absolute maximum input voltage is 7V according to the datasheet of TPS63020, I am sure that input voltage is 6V through a Schottky Diode. How would it get burnt? IC became hot.
Step C:
Input Capacitors 10uF (X5R) * 1
Output Capacitors 22uF (X5R) * 1
Power Supply 3V Current Limit 3A
Worked GSM/GPRS 30 Min.
IC Suddenly Burnt. IC got heated.
For All Steps:
Resistor Divider was 680k/100k giving Vout 3.9V.
Inductor Used 1.5uH Bourns.
Never used a Bypass Capacitor for VINA Pin.
Tied EN pin always to Vin (Input Voltage).
PG is Open
In step C, PS/SYNC tied to 0V (GND). In step A and B PS/SYSNC pin was tied to VINA.
During the Normal Operation IC does not experience any High Temperature Case. It is under normal temperature.
What could be the Reason?
Is there any output capacitor effect to get malfunction the IC permanently?
