Current & Power Monitors & Regulators Current and Voltage Feedback Controllers
Feedback Controllers With Low Current Sense Voltage
The IPS20 and IPS21 are low-voltage current sensing feedback controllers used in switch mode power supplies to control load-side current and voltage. They have been designed to limit the power dissipated in the sensing circuitry for high output current applications that require current limiting. They both incorporate a 4V shunt regulator for maximum flexibility to power the chip.
The IPS20 and IPS21 only differ by the characteristics of the current sensing references.The IPS20 incorporates a trimmed 50mV reference with a positive temperature coefficient which closely matches that of a PCB copper trace. This copper trace sensing method can be used inexpensively with very low associated power losses. The IPS21 incorporates a temperature compensated 100mV reference for more conventional resistors. Both controllers feature the same voltage regulator section with a trimmed temperature stable voltage reference of 1.19V.
Features
Dual precision regulators for SMPS voltage and current control
Output currents up to 50A
Output voltage down to 1.2V
50mV or 100mV current sensing voltage
1.20V voltage reference
Operates with grounded optocoupler
4V shunt regulator for VCC supply
Applications
Fast chargers for power tools and other applications
Battery eliminators
Industrial and bench-type power supplies
Distributed power systems