Corporate News

The fully domestically produced RMJ1209AS push-pull control chip from Reactor Microelectronics precisely matches the small-volume, low-power isolated interface power supply market segment, meeting the localization substitution needs of various equipment. Relying on a complete domestic supply chain and a mature and reliable push-pull control architecture, RMJ1209AS has now completed large-scale project verification in the field of special equipment, making it the preferred main control chip for domestic substitution in low-power isolated interface power supplies.

The chip features fewer peripheral components and high integration, resulting in a compact solution with easy-to-design circuitry. It supports a wide voltage input range of 9~30V and can achieve multi-level voltage outputs from 3.3V to 24V, providing one-stop support for the development of 1~2W isolated DC-DC power supplies.

1. Core principle and function of the product

The chip integrates an oscillator, dual drive units, and two power switch transistors. The two drives independently control the current paths of the primary winding, paired with independent NMOS power transistors working alternately to form a standard primary push-pull control architecture. With built-in timing logic, the control sequence of first turning off and then turning on the two power transistors is strictly implemented to avoid the risk of shoot-through and enhance the stability of circuit operation.

The chip is equipped with a comprehensive set of built-in protection mechanisms, ensuring long-term reliable operation of the converter in all aspects:

1. Integrated soft-start function to suppress high current surge at power-on and reduce device stress;

2. The short-circuit protection and current-limiting drive are designed independently and decoupled, ensuring that the capacitive load drive capability and short-circuit protection do not interfere with each other;

3. The short-circuit protection threshold can dynamically adapt and adjust according to the input voltage and ambient temperature, ensuring strong consistency in protection performance and remaining unaffected by fluctuations in operating conditions;

4. Integrated with multiple protections including undervoltage lockout, overtemperature protection, and input overvoltage protection, it supports automatic recovery in fault conditions without requiring manual intervention.

II. Core Advantages

✅ Dedicated primary-side push-pull control architecture, suitable for isolated power supply scenarios

✅ Built-in power MOSFETs, with fewer peripheral components, enabling a miniaturized and low-cost solution

✅ Soft start mechanism, limiting peak current upon power-on, reducing device loss

✅ Self-recovery protection against short circuit and over-temperature faults, facilitating convenient operation and maintenance

✅ Integrated multiple protections against overvoltage and undervoltage inputs, ensuring maximum system reliability

✅ Wide operating range adaptability: 9~30V constant voltage input, 3.3V~24V multi-level output, covering the full power range of 1~2W

✅ Super capacitive load drive, compatible with large-capacity output capacitors ranging from 220μF to 4000μF

For inquiries regarding product ordering and related technical issues, please feel free to call: 029-88827769/15626011985. Our technical team will respond promptly and provide you with efficient and reliable solutions.