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See Technical Specifications

UC3845D

Current mode controller

Manufacturer:

Texas Instruments
Mfr.Part #:

UC3845D
Datasheet:

UC3845D Datasheet (PDF)
Topology:

Boost, Buck, Buck boost, Flyback, Forward
Control mode:

Peak current mode
Duty cycle (max) (%):

50
Switching frequency (max) (kHz):

500
EDA/CAD Models:

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UC3845D General Description

The UC3845D is a pulse width modulation (PWM) controller IC designed for power supply applications. It operates at a fixed frequency and can be used in both isolated and non-isolated power supplies. The UC3845D features a voltage reference, error amplifier, oscillator, PWM comparator, dead-time control, and high current totem pole outputs.This device provides precise control of the output voltage by adjusting the duty cycle of the PWM signal. It offers adjustable soft-start and current limit functions for protection against overcurrent conditions. The UC3845D also has an undervoltage lockout feature to ensure safe operation during startup.With a wide input voltage range and high output current capacity, the UC3845D is suitable for various power supply designs. It is commonly used in switch-mode power supplies, lighting applications, battery chargers, and DC-DC converters. The IC comes in a dual in-line package (DIP) or surface-mount package for easy integration into circuit boards.

Key Features

UC3845D is a high performance current-mode PWM controller

It offers adjustable frequency operation up to 1MHz

Features a precision reference with 2% tolerance

Provides line under-voltage lockout

Offers cycle-by-cycle current limiting

Includes soft-start input

Has a totem-pole output stage with high current capability

Application

The UC3845D is commonly used in switch mode power supplies, battery chargers, and LED drivers

It can also be found in applications such as industrial power supplies, automotive electronics, and solar inverters

Its versatility and high efficiency make it suitable for a wide range of power management applications

Specifications

Topology	Boost, Buck, Buck boost, Flyback, Forward	Control mode	Peak current mode
Duty cycle (max) (%)	50	Switching frequency (max) (kHz)	500
Features	Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Multi-topology	UVLO thresholds on/off (V)	8.4/7.6
Operating temperature range (°C)	0 to 70	Rating	Catalog
Gate drive (typ) (A)	1	Vin (max) (V)	28