Electronics Weekly Electronics Design & Components Tech News
STMicroelectronics has introduced a low-voltage shunt reference that can provide a precisely controlled output. It is designed for use on computer motherboards and in set-top boxes, instrumentation, battery chargers, switch-mode power supplies and battery-operated equipment.
The TS3431 can be used to replace Zener diodes in applications that need better performance, particularly at low voltages, said the firm. Using the reference in the feedback control loop of a switch mode supply will enable it to generate low voltages, such as 3.3 or 3V. Other typical applications include shunt or series regulators, voltage monitors and error amplifiers.
The reference can be programmed with an external resistor bridge to output any voltage from 1.24V to 24V. It will then hold that voltage with an accuracy of ±2 per cent, ±1 per cent or ±0.5 per cent, depending on the version.
The part will sink between 400µA and 100mA of current and maintain its accuracy over the industrial operating temperature range of -40° to +125°C.
It is available in three versions (TS3431, A and B), depending on the accuracy the user needs. It is available in two packages: SOT23-3L for space-saving applications or the standard three-pin TO-92.
