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See Technical Specifications

UC3843AN

Switching Controllers with Current Mode of 0.5mA

Manufacturer:

Texas Instruments
Mfr.Part #:

UC3843AN
Datasheet:

UC3843AN Datasheet (PDF)
Topology:

Boost, Buck, Flyback, Forward
Control mode:

Current
Duty cycle (max) (%):

100
Switching frequency (max) (kHz):

500
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UC3843AN General Description

The UC3843AN is a versatile PWM (Pulse Width Modulation) controller IC commonly used in switch-mode power supply applications. Manufactured by Texas Instruments, it operates in voltage mode control and offers precise regulation of output voltage. The device integrates functions such as a precision voltage reference, error amplifier, PWM comparator, and a high-current totem-pole output stage. Its internal oscillator can be adjusted over a wide frequency range, allowing flexibility in design. The UC3843AN facilitates efficient power conversion by regulating the duty cycle of the output waveform based on feedback from the output voltage. With its wide input voltage range and robust design, it finds applications in various power supply designs, including AC/DC converters, DC/DC converters, and battery chargers. The 'AN' suffix denotes the package type, typically a DIP (Dual Inline Package), making it suitable for through-hole mounting on PCBs

Key Features

Current-mode PWM controller

Adjustable output voltage and frequency

Voltage feedback loop for stable operation

Soft start function for controlled start-up

Overcurrent protection

Under-voltage lockout

Low start-up current

High switching frequency for efficient power conversion

Application

The UC3843AN is commonly used in switching power supply applications, such as offline flyback converters, DC-DC converters, and LED drivers

It is ideal for low-to-medium power applications where high efficiency and precise regulation are important

Specifications

Topology	Boost, Buck, Flyback, Forward	Control mode	Current
Duty cycle (max) (%)	100	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