IR3721 Power Monitor IC With Analog Output

The International Rectifier IRAM109-015SD is a multi-chip hybrid integrated circuit designed specifically for low-power appliance motor control applications, including fans, pumps, and refrigerator compressors. Its compact single in-line package (SIP-S) optimizes PCB space. The device includes several built-in protection features such as temperature feedback, shoot-through prevention, under-voltage lockout, and shutdown input, making it a robust solution. An internal shunt resistor is incorporated to save board space while providing clean current feedback. The combination of highly efficient high-voltage MOSFETs, the industry-standard half-bridge high-voltage integrated circuit (HVIC) driver (compatible with 3.3V/5V input), and a thermally enhanced package positions this device as a competitive option. The high-side drivers utilize bootstrapped power supplies generated through internal bootstrap diodes, eliminating the need for isolated power supplies. This functionality reduces component count, board space, and overall system cost.

The IRAM109-015SD integrates multiple functionalities essential for effective motor control in low-power applications. The hybrid design combines the advantages of discrete components and integrated circuits, resulting in improved reliability and performance. The SIP-S package format is particularly advantageous for space-constrained designs, allowing for easy integration into existing systems without extensive redesign.

The built-in protection mechanisms enhance the operational safety of the device. Temperature feedback ensures that the circuit operates within safe limits, while shoot-through prevention protects against simultaneous conduction of high-side and low-side MOSFETs, which could lead to catastrophic failures. Under-voltage lockout further safeguards the circuit by disabling operation when supply voltage drops below a certain threshold, preventing erratic behavior.

The use of an internal shunt resistor for current feedback is a significant design feature that simplifies layout and reduces the number of external components required. This design choice not only conserves space but also improves the accuracy of current sensing, which is critical for efficient motor control.

Moreover, the integration of high-voltage MOSFETs within the IC contributes to the overall efficiency of the system. The half-bridge HVIC driver is designed to handle the switching requirements of the motor control application effectively, with compatibility for both 3.3V and 5V logic levels, making it versatile for various control systems.

The bootstrapped high-side driver architecture offers a cost-effective solution by utilizing internal bootstrap diodes. This design eliminates the need for additional isolated power supplies, streamlining the overall system architecture and reducing both the bill of materials and assembly complexity.

In summary, the IRAM109-015SD represents a sophisticated solution for low-power motor control applications, combining advanced features and high efficiency within a compact package, thereby facilitating enhanced performance and reliability in consumer appliances.International Rectifier`s IRAM109-015SD is a multi-chip Hybrid IC developed for low power appliance motor control applications such as Fans, Pumps, refrigerator compressors, etc. The compact Single in line (SIP-S) package minimizes PCB space. Several built-in protection features such as temperature feedback, shoot through prevention, under voltage

lockout, and shutdown input makes this a very robust solution. The internal shunt resistor saves board space and provides clean current feedback. The combination of highly efficient high voltage MOSFETs the industry benchmark Half-Bridge HVIC driver (3. 3V/5V input compatible) and thermally enhanced package makes this a highly competitive solution. The bootstrapped power supplies for the high side drivers CAN be generated using internal bootstrap Diodes eliminating the need for isolated power supplies.

This feature reduces the component count, board space, and cost of the system. By International Rectifier Corp. 🔗 External reference