Other Parts Discussed in Thread: LM7705, OPA320,
Hi Taru
We have used opamp TL081HIDBVR in our Design. Just a query if this opamp can work with below input voltage range
Input at non inverting terminal= 0V to 3.5V
SCH is attached
PWM_MCU is 5K with varying duty cycle 0 % to 100% (Voltage level 0V to 3.45V)
Resistor R11 and Capacitor C17 filter the PWM and product below voltage across C17 (non-inverting terminal of opamp)
Voltage (PWM) |
Duty Cycle(100% to 0%) |
Voltage across C17 |
3.45 |
100 |
3.45 |
3.45 |
90 |
3.105 |
3.45 |
80 |
2.76 |
3.45 |
70 |
2.415 |
3.45 |
60 |
2.07 |
3.45 |
50 |
1.725 |
3.45 |
40 |
1.38 |
3.45 |
30 |
1.035 |
3.45 |
20 |
0.69 |
3.45 |
10 |
0.345 |
3.45 |
9 |
0.3105 |
3.45 |
8 |
0.276 |
3.45 |
7 |
0.2415 |
3.45 |
6 |
0.207 |
3.45 |
5 |
0.1725 |
3.45 |
4 |
0.138 |
3.45 |
3 |
0.1035 |
3.45 |
2 |
0.069 |
3.45 |
1 |
0.0345 |
3.45 |
0 |
0 |
Thanks
Kunal Barot