ISW1212A Power Supplies - Board Mount

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The ISW1212A is a DC/DC converter used to convert a wide input voltage range to a regulated output voltage. It is typically used to power the circuits of small, battery-operated devices, such as cellular phones or digital cameras. The ISW1212A offers excellent performance in applications where space and power are constrained.

Working Principle

The ISW1212A works by using a voltage-fed PWM (pulse width modulation) control technique. This method of control reduces the size of the converter, while providing high efficiency and accurate regulation. In this type of power converter, a propotional-integral (PI) loop controls its operation. Input voltage is regulated by the PI loop, which senses the output voltage and adjusts the duty cycle of the PWM accordingly. This level of regulation is required to prevent over-voltage and noise on the output, which could damage the components connected to the output.

Input Voltage Range

The ISW1212A can accept input voltages of up to 20V. This allows it to be used in applications where the supply voltage is not fixed, such as when the device is powered by a battery or solar cell. The ISW1212A also has an under-voltage lockout feature, which prevents the converter from being damaged if the input voltage is too low. This makes it ideal for applications where the supply voltage can vary.

Output Voltage Range

The maximum output voltage of the ISW1212A is 12V. This is enough to power the majority of circuits used in small devices. The output voltage is adjustable, which allows the user to change the output voltage to meet the requirements of the connected components. The ISW1212A also features short-circuit and over-current protections, which help protect the circuit in the event of a fault.

Frequency Range

The ISW1212A has an adjustable switching frequency of up to 500kHz. This higher frequency allows the use of smaller inductors and capacitors, which greatly reduces the overall size of the converter. The higher frequency also increases efficiency, allowing the converter to operate at higher temperatures and for longer periods of time. For applications where the output voltage needs to be very precise, the switching frequency can be adjusted to minimize the output voltage ripple.

Conclusion

The ISW1212A is a DC/DC converter designed specifically for small, battery-operated devices. It is capable of accepting input voltages of up to 20V and is able to reliably provide an adjustable output voltage of up to 12V. It features a voltage-fed PWM control technique with a PI loop, as well as short-circuit and overcurrent protections. The adjustable switching frequency of up to 500kHz further improves the overall efficiency and performance of the converter. The ISW1212A is a reliable and efficient solution for providing power to small devices.

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