UC3842AD Integrated Circuits (ICs)

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC3842A
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	10 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Buck, Buck-Boost, Flyback, Forward
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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The UC3842A is a high performance current mode Pulse Width Modulation (PWM) controller specifically designed for Pulse Width Modulated (PWM) switching power supplies, allowing them to be implemented with minimal external components at low cost. This chip includes an integrated error amplifier, oscillator and different protection circuits, which enable the user to design exact power supply circuits with minimum part count and effort.The UC3842A is a part of the general device family developed by Motorola and it is designed for high performance, low power and cost effective applications. It is a voltage regulator and DC DC switching controller that can be used for controlling a wide range of switching power supplies. The device features an on-board driver for a high power MOSFET which helps to reduce the cost and complexity of the design.The chip is designed to work with an external power MOSFET, transformer and voltage reference to form an on-board switching regulator controller with output voltages ranging from 0.5V to 24V. The UC3842A includes an error amplifier and a Ground Sense circuit that are used to regulate the output voltage. The voltage reference circuit allows the output voltage to be programmed by setting the reference voltage.The UC3842A is also equipped with several protection circuits that improve the reliability of the circuit and protect it from overloads and input voltage surges. These include a cycle-by-cycle current limit, an over-temperature protection, a low voltage fault protection, an over-voltage protection, and an under-voltage fault protection. All these protection circuits are integrated in the chip and reduce the need for an external protection circuit.The chip can be used to design universal power supplies, including those for both AC and DC input. It allows for quick and efficient design of high power switching regulator controllers and provides a high degree of flexibility in the selection of the MOSFET and transformer.In conclusion, the UC3842A is a versatile, low power and cost effective voltage regulator and DC DC switching controller. It features an on-board driver for a high power MOSFET, as well as several integrated protection circuits. It is designed for quick and efficient design of high power switching regulator controllers and provides a high degree of flexibility in the selection of the MOSFET and transformer. It is compatible with both AC and DC input and can be used to design universal power supplies.

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