Input | Output | Supply | |||||
---|---|---|---|---|---|---|---|
Iload Min | Iload Max | Vout Min | Vout Max | Vcm Min | Vcm Max | Vee | |
0.5A | 9.9A | 250mV | 4.95V | 12V | 400V | GND (0V) |
This cookbook is intended to demonstrate a method of designing an accurate current sensing option for systems with high common mode voltages. The principle aspect of this design uses a unidirectional circuit to monitor a system with Vcm = 400V by floating the supplies of the device across a Zener diode from the supply bus (Vcm). This cookbook is based on the High Voltage 12V – 400V DC Current Sense Reference Design.
DC Simulation Results
The following graph shows a linear output response for load currents from 0.5A to 10A and 12V ≤ Vcm ≤ 400V. Iout and Vout remain constant over a varying Vcm once the Zener diode is reverse biased.
Steady State Simulation Results
The following image shows this system in DC steady state with a 2A load current. The output voltage is 10× greater than the measured voltage across Rshunt.
Texas Instruments,SPICE SGLC001 simulation files, SBOA295 software support
Texas Instruments, Current sense amplifiers, Precision lab video series
Texas Instruments, Extending the Common-Mode Voltage Range of Current-Output Current Shunt Monitors, application brief
Texas Instruments, High Voltage 12V – 400V DC Current Sense Reference Design, TIDA-00332 tool
Texas Instruments, Source files for SBOA295, design tool
Texas Instruments, Current-sense amplifiers, product page
INA138 | ||||
---|---|---|---|---|
Vss | 2.7V to 36V | |||
Vin cm | 2.7V to 36V | |||
Vout | Up to (V+) -0.8V | |||
Vos | ±0.2mV to ±1mV | |||
Iq | 25µA to 45µA | |||
Ib | 2µA | |||
UGBW | 800kHz | |||
# of Channels | 1 | |||
INA138 |
INA168 | ||||
---|---|---|---|---|
Vss | 2.7V to 60V | |||
Vin cm | 2.7V to 60V | |||
Vout | Up to (V+) -0.8V | |||
Vos | ±0.2mV to ±1mV | |||
Iq | 25µA to 45µA | |||
Ib | 2µA | |||
UGBW | 800kHz | |||
# of Channels | 1 | |||
INA168 |
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