High-Side V-I Converter, 0-2V to 0-100mA, 1% Full Scale Error
TIPD102
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
-
TIPD102 Design File
(ZIP 853 KB)
19 Sep 2013
- TIPD102 Verified Design Reference Guide
(PDF 704 KB)
19 Sep 2013
Description
This Verified Design delivers a well-regulated current to a ground-referenced load that could be used for actuators, sensors, motors, and many other applications. The design utilizes a two-stage approach to allow the high-side current source to accept a ground-referenced input. The first stage uses an op amp and n-channel MOSFET to translate the ground-referenced input to a supply-referenced signal. The supply-referenced signal drives the second stage op amp that controls the gate of a p-channel MOSFET to regulate the load current. The OPA2333 is used for both stages of the design because of the low quiescent current, rail-to-rail input/output, and zero-drift chopper technology. The rail-to-rail input stage includes voltages that exceed both supply rails so there is no loss or "dead-zone" when used as a low-side sink for the first stage or as a high-side source for the second stage. The rail-to-rail output ensures that the op amp is able to successfully turn off the active devices ensuring low zero-scale currents. The zero-drift architecture allows for precision DC performance over temperature.
See more TI Precision Designs
Features
- Converts Voltage to current: 0 to 2 V, 0 mA to 100 mA
- Less than 0.1 % Error
- Single-supply solution with rail-to-rail input dual-channel op amp
- Good compliance voltage to the both rails
- Design creates a current source that allows for a GND referenced load
- Excellent DC performance and temperature drift using zero-drift OPA2333 op amp
-
- Theory
- Component Selection
- TINA-TI Simulation
- Schematics and PCB Layout
- Verification and Measured Performance
- Modification Options
This Verified Design Includes:
See the Important Notice and Disclaimer covering reference designs and other TI resources.
