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See Technical Specifications

UC2845N

The UC2845N serves as a current mode PWM controller

Manufacturer:

Texas Instruments
Mfr.Part #:

UC2845N
Datasheet:

UC2845N Datasheet (PDF)
Topology:

Boost, Buck, Flyback, Forward
Control mode:

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

50
Switching frequency (max) (kHz):

500
EDA/CAD Models:

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UC2845N General Description

The UC2845N is a high-performance voltage mode controller for switching power supplies. It is designed to operate in a wide range of applications, including telecom, industrial, and consumer electronics. The device features a precision reference voltage of 5V, which helps maintain accurate regulation of the output voltage. The UC2845N offers a programmable oscillator frequency that can be adjusted externally, allowing for flexibility in tuning the switching frequency to optimize system performance. It also includes a current sense input for cycle-by-cycle current limiting, overcurrent protection, and a soft-start function to prevent excessive inrush current.With a wide supply voltage range of 7V to 30V, the UC2845N can be used in various power supply configurations. It is housed in an 8-pin PDIP package, making it easy to integrate into existing circuit designs.

Key Features

Voltage mode PWM controller

Programmable soft-start function

Current limiting and shut-down for overcurrent protection

Adjustable frequency operation

Wide input voltage range

Error amplifier with adjustable reference voltage

Under-voltage lockout with hysteresis

Available in 8-pin DIP package

Application

The UC2845N is commonly used in switch-mode power supplies for applications like battery chargers, LED drivers, and DC-DC converters

It finds utility in industries ranging from automotive to telecommunications due to its efficient regulation and versatility in controlling power flow

Specifications

Topology	Boost, Buck, 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)	-40 to 85	Rating	Catalog
Gate drive (typ) (A)	1	Vin (max) (V)	28