Design Goals
Input | Output | Supply | |||
---|---|---|---|---|---|
ViMin | ViMax | IoMin | IoMax | Vcc | Vee |
0V | 2V | 0mA | 100mA | 5V | 0V |
Design Description
This single-supply, low-side, V-I converter delivers a well-regulated current to a load which can be connected to a voltage greater than the op-amp supply voltage. The circuit accepts an input voltage between 0V and 2V and converts it to a current between 0mA and 100mA. The current is accurately regulated by feeding back the voltage drop across a low-side current-sense resistor, R3, to the inverting input of the op amp.
Design Notes
Design Steps
Design Simulations
DC Simulation Results
Loop Stability Simulation Results
Step Response
Compliance Voltage
Set output to full-scale (100 mA) and test the maximum load resistance.
Design References
Design Featured Op Amp
TLV9062 | |
---|---|
Vss | 1.8 V to 5.5 V |
VinCM | Rail-to-rail |
Vout | (Vcc + 60mV) to (Vee – 60mV) at RL = 2kΩ |
Vos | 1.6mV |
Iq | 0.538mA |
Ib | 0.5pA |
UGBW | 10MHz |
SR | 6.5V/µs |
#Channels | 1, 2, 4 |
www.ti.com/product/TLV9062 |
Design Alternate Op Amp
TLV9042 |
OPA2182 |
|
---|---|---|
Vss | 1.2V to 5.5V |
4.5V to 36V |
VinCM | Rail-to-rail |
(Vee – 0.1V) to (Vcc – 2.5V) |
Vout | Rail-to-rail |
Rail-to-rail |
Vos | ±0.6mV |
±0.45μV |
Iq |
0.01mA |
0.85mA |
Ib | ±1pA |
±50pA |
UGBW | 350kHz |
5MHz |
SR | 0.2V/µs |
10V/μS |
#Channels |
1,2,4 |
2 |
www.ti.com/product/TLV9042 |
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