ISL9111AEHADJZ-T

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The ISL9111AEHADJZ-T is a monolithic, high efficiency, ultra-low noise and low Quasi-resonant (QR) single-phase dual-output dc-dc converter optimized for multiple application fields. It is designed to provide up to 3.6 A from a 5 V input to both a 12 V and 3.3 V output. The output voltage can be adjusted via a single external resistor for use in various applications including PCs, servers, networking, telecom and telecommunications equipment.

The ISL9111AEHADJZ-T is equipped with a unique set of features, such as a dual output capability, an integrated MOSFETs and current-mode control, that facilitate its use in applications requiring a high efficiency and low output noise. The device also includes the additional benefit of a low-voltage operation and stability at startup. Furthermore, the ISL9111AEHADJZ-T provides low output voltage ripple, a wide input voltage range, and is RoHS compliant, making it suitable for use in a wide range of applications.

The ISL9111AEHADJZ-T is a specifically designed control IC, which provides a comprehensive line of features necessary for a regulated DC/DC converter. The device incorporates a current-mode Pulse Width Modulation (PWM) with an adjustable frequency, and a dual gate driver support for synchronous rectification operation. In addition, the circuit includes an in-phase current sense for improved efficiency and an adjustable soft-start delay for optimized startup. Moreover, the IC features an integrated switching MOSFET, an adjustable output voltage range, an adjustable dead-time, as well as overvoltage and overload protection.

The switchmode of the ISL9111AEHADJZ-T is based on the Quasi-Resonant (QR) topology consisting of a primary-side synchronous PWM controller (with hysteretic operation over complete load range) and secondary-side synchronous rectification (SR). The built-in transformer and integrated MOSFETs, together with the optimized parameters results in an efficient, low ripple and low noise operation of the converter. The other benefits of QR topology are linked to having a constant input voltage, leading to a drop in 10% of the total output power during no-load and light-load, as well as a low-harmonic noise.

The ISL9111AEHADJZ-T is programmed for a fixed frequency operation with a full and fixed duty-cycle of 50%. This feature enables a high efficiency operation, however, it limits the adaptation for ripple current blocking applications requiring higher output power and transient response.The sync driver, on the other hand, offers a much wider range of output current and adjustable switch characteristics. The sync driver is connected to a separate input control signal and is able to control the output current and transient response independently.

The ISL9111AEHADJZ-T is equipped with several output modes, such as pulse amplitude modulation (PAM) or dual-mode power delivery (DPM). PAM is a fixed-frequency, pulse-width modulated technique, which provides a wide range of output current and a high load transient capability. It is suitable for applications requiring high dynamic load changes, such as those found in computers and consumer electronics products. The dual-mode power delivery mode, or DPM, is an extended version of the PAM mode. The DPM mode provides a wider range of output current, which allows for a more linear current delivery. This makes the ISL9111AEHADJZ-T suitable for applications relying on a controlled current flow.

In summary, the ISL9111AEHADJZ-T is a high efficiency and ultra-low noise single-phase dual-output dc-dc converter optimized for multiple application fields. It is designed to provide up to 3.6 A from a 5 V input to both a 12 V and 3.3 V output. The device is compliant with RoHS requirements and includes a unique set of features, such as a dual output capability and an integrated MOSFET, that make it suitable for various application fields. It also includes an adjustable soft-start delay, overvoltage and overload protection, as well as an adjustable output voltage range. Furthermore, the ISL9111AEHADJZ-T is based on a Quasi-Resonant (QR) topology, which enables a higher efficiency, low ripple and low noise operation, and is also suitable for use in applications with high dynamic load changes.

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