ISE1203A-H Power Supplies - Board Mount

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DC-DC converters are key components in power electronics. They inherently offer much higher efficiency than classical transformers, apart from making electronic products much more compact. In DC-DC converters, the Nexperia ISL1203A-H is a high-performance power conversion circuit that offers excellent efficiency and excellent power supply rejection ratio (PSRR). The power supply features over current and over voltage protection functions, as well as an external load disconnection and output voltage regulation control.

The ISL1203A-H is designed to provide a wide voltage input and a high-efficiency power conversion solution with a maximum output power of up to 60 W. This chip is used in applications such as portable multimedia players, laptops, digital cameras, gaming consoles and communications products. It is particularly suitable for power supplies that are sensitive to noise and supply high current loads such as LCD TV’s, LED lighting, and medical devices.

The ISL1203A-H is a single stage DC-DC converter and is mainly composed of three parts. The power MOSFET and inductor to form the power stage, which can achieve an efficient and stable energy conversion process. The second is the controller circuit, which includes a built-in Linear Regulator (LR) and voltage feedback (FB) circuit. The LR provides the output voltage without any intervention. The third is the protection circuit against current overloading, overload, and thermal overheating.

The principle of this power conversion circuit is based on the buck-boost topology, which is suitable for both step-down and step-up applications. The input voltage of the ISL1203A-H ranges from 2.7 V to 5.5 V. The PWM control circuit of the converter can respond to feedback voltage quickly, and its response time is in the nanosecond range, which is faster than the discrete component-based converters. Additionally, the synchronization frequency can reach 1.1 MHz, so it can reduce the size of the inductor and other components, and the efficiency is as high as 95%.

The ISL1203A-H converter’s output voltage range is 0.95 V to 5.5 V, and its output current can reach up to 12 A. It can support the load power from 1 W to 60 W, and the output ripple is much lower than the other analog controllers. The power supply rejects the interference of the outside environment due to the low output ripple, and the noise of other circuits is also rejected effectively to realize the effective protection of the internal circuit. It has internal soft-start over-voltage, over-temperature and over-current protections, which effectively prevent energy and thermal losses.

In conclusion, the ISL1203A-H is a high-performance and highly integrated DC-DC converter. It has wide voltage input range, high efficiency, high power density, low noise, and overvoltage, overcurrent and overheat protection functions, making it ideal for applications that require a reliable power supply.

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