UC3845 Chinese information introduction
Introduction: UC3845 - High Performance Current Mode Controller
description:
The UC3845 is a high performance fixed frequency current mode controller designed for off-line and DC to DC converter applications, providing designers with a cost-effective solution with minimal external components. These integrated circuits feature a trimmable oscillator, accurate duty cycle control, temperature compensated reference, and a high gain error amplifier. The current sampling comparator and the high current totem pole output are ideal for driving power MOSFETs.
Other protection features include input and reference undervoltage lockout, each with hysteresis, cycle-by-cycle current limit, programmable output dead time, and single pulse measurement latch. These devices are available in 8-pin dual in-line plastic packages and 14-pin plastic surface mount packages (SO-14). The totem pole output stage of the SO-14 package has separate power and ground pins. [1]
The UC3845 is designed for low voltage applications.
Features:
(1) Current mode operation, output switching frequency is 500 kHz.
(2) The output duty cycle can be adjusted from 50% to 70%.
(3) Automatic feedforward compensation.
(4) Cycle-by-cycle current limit protection, locked pulse width modulation (PWM).
(5) Internal adjustment reference source with undervoltage lockout.
(6) High current totem pole output.
(7) Input undervoltage lockout with hysteresis.
For more information on the high-performance current mode controller UC3845 (UC3844), please click on the link below to download the UC3845 Chinese data, application circuit diagram, and pin package diagram:
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