UC3842AM

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

UC3842AM is an integrated switch-mode regulators and controllers designed for use in pulsed-rectifier and multipulse applications. This particular device combines on-chip circuitry to implement a single pulse-width modulation (PWM) control function. It includes an internal temperature compensation circuit and requires only two external resistors to set the output voltage.

The output voltage is accurately maintained by regulating the peak inductor current by varying the duty cycle with the pulse-width modulator. An inner feedback loop is used to set the peak current level. An outer loop is used to regulate the output voltage. A thermal shutdown mode is also provided.

The UC3842AM device is a highly integrated, monolithic control circuit which combines on-chip the primary building blocks required for the implementation of switch-mode DC-to-DC converters (using either linear post regulation or voltage-mode control). A versatile power-control block offers overload, over-voltage, under-current, and short-circuit protection. A pulse-by-pulse current limitation in the voltage regulator block permits very efficient operation in converters with larger load or input voltage variations.

UC3842AM is designed for flexible application in several topologies, including linear post regulation and voltage-mode control methods. Its primary uses are in converters that require enhanced transient response, low noise operation, a wide control-loop bandwidth, and low output impedances. It is also suitable for applications with tight output-voltage regulation.

For operation with a linear post regulator, the voltage regulator section provides accurately controlled Valley current-mode control, as well as Time-Out/Valley current limiting. A dedicated oscillator section provides the necessary clock, while an internal latch improves transient response. The wide loop-gain bandwidth, with power complementary output, is easily adapted to the needs of line-powered regulators with very low EMI.

In voltage-mode control applications, the UC3842AM has an enhanced level of protection against output overloads and input supply failures, due to the current limit feature. Voltage-mode control also improves line and load transient response and maintains stable step-down operation even with large output capacitance.

UC3842AM has an on-chip temperature-compensation circuit, so it can be used in applications with no additional compensationrequired. A single resistor is all that is required to set the output voltage, and two external resistors determine the current limit and soft start times. This device operates at frequencies of up to 500kHz, allowing for small and efficient converter designs.

In summary, UC3842AM is an integrated switch-mode regulators and controllers designed for use in pulsed-rectifier and multipulse applications. It is suitable for applications requiring tight output-voltage regulation, with excellent transient response and low EMI. This device operates at frequencies of up to 500kHz and uses only two external resistors to set the output voltage and current limit. A temperature-compensation circuit is also included to improve accuracy.

The specific data is subject to PDF, and the above content is for reference