ISO122P / 124 power supply has a three-port isolation amplifier circuit diagram

Description: Power isolation is demonstrated for the ISO122P / 124, which features a three-port amplifier. The circuit also utilizes precision analog isolation amplifiers. The ISO122P / 124 isolation amplifier is a cost-effective solution, and the HPR117 DC/DC converter component provides the necessary isolation between the primary and secondary sides of the power supply through two HPR117 units. The isolated ISO122 completes the signal amplification, while the output from the HPR117's O pin generates a +15V power output relative to ground. Since the HPR117 includes a built-in 0.33µF bypass capacitor, there is no need for external bypass capacitors at each power supply terminal. The characteristics of this circuit effectively eliminate power supply noise, thereby enhancing the power supply rejection ratio.

The described circuit employs the ISO122P / 124 isolation amplifiers, which are designed to provide high precision and low noise in applications requiring electrical isolation. The three-port configuration of the ISO122P / 124 allows for differential signal input, with the output providing an isolated representation of the input signal. This is particularly beneficial in systems where ground loops or common-mode noise can adversely affect performance.

The HPR117 DC/DC converters are utilized to achieve electrical isolation between the power supply and the signal processing sections of the circuit. By employing two HPR117 units, the design ensures that the primary side of the power supply is completely isolated from the secondary side, where the ISO122 amplifier operates. This isolation is crucial in applications such as medical instrumentation or industrial control systems, where safety and signal integrity are paramount.

The output voltage of +15V generated at the O pin of the HPR117 is essential for powering the ISO122 amplifier, ensuring that it operates within its specified voltage range. The inclusion of the 0.33µF bypass capacitor within the HPR117 helps to stabilize the output voltage and filter out high-frequency noise, thus improving the overall performance of the circuit without necessitating additional external components.

Overall, this power isolation circuit effectively mitigates power supply noise, enhancing the power supply rejection ratio and ensuring reliable operation in sensitive electronic applications. The integration of precision analog isolation amplifiers and robust DC/DC converters contributes to a reliable and efficient design suitable for a variety of isolation requirements.Power Isolation Shown for ISO122P / 124 has three ports amplifier. The circuit also use precision analog isolation amplifiers ISO122P / 124 low-cost isolation amplifier and HPR117 DC / DC converter component provides the required isolation amplifier primary and secondary side of the power supply by the two HPR117, isolated ISO122 completion signal amplification, Meanwhile HPR117 of O, feet form a + 15V (for Gnd) power output. Because HPR117 built 0.33 F bypass capacitor, so no external power supply terminal of each bypass capacitor filter.

The characteristics of the circuit can be eliminated due to power supply noise, improve the power supply rejection ratio.