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See Technical Specifications

UC3843AN +BOM

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
EDA/CAD Models:

Request Free CAD Models for UC3843AN

Description

The UC3843AN is a high-performance current-mode controller from ON Semiconductor, designed for switching power supply applications. It features a trimmed oscillator discharge current for precise duty cycle control, current mode operation up to 500 kHz, automatic feed-forward compensation, and latching PWM for cycle-by-cycle current limiting. This device is ideal for low-to-medium power applications where high efficiency and precise regulation are important. Its trimmable reference voltage ensures accurate output regulation, while its undervoltage lockout with hysteresis prevents damage from input voltage fluctuations. The UC3843AN is commonly used in offline flyback converters, DC-DC converters, and LED drivers. Its totem pole output driver can handle high currents, making it suitable for a wide range of applications. With its low startup and operating current, the UC3843AN is an efficient and reliable choice for many switching power supply designs.

Features

The UC3843AN features include:

Trimmed oscillator discharge current for precise duty cycle control
Current mode operation to 500 kHz
Automatic feed forward compensation
Latching PWM for cycle-by-cycle current limiting
Internally trimmed reference with undervoltage lockout
High current totem pole output
Undervoltage lockout with hysteresis
Low startup and operating current
Direct interface with ON Semiconductor SENSEFET products
Pb-Free packages are available

These features make it suitable for switching power supply applications, such as offline flyback converters, DC-DC converters, and LED drivers.

Manufacturer

The manufacturer of the UC3843AN is ON Semiconductor, a leading global semiconductor company that designs, manufactures, and supplies power management, analog, and sensor components for various industries.

Applications

The UC3843AN is commonly used in switching power supply applications, such as offline flyback converters, DC-DC converters, and LED drivers. It's ideal for low-to-medium power applications where high efficiency and precise regulation are important.

Equivalent

The equivalent products of UC3843AN are:

STP16LP55
NCP3801
UCC28051
LM5117

These devices offer similar current-mode controller functionality, high-frequency switching capabilities, and precision regulation features as the UC3843AN. However, please note that each product may have slightly different specifications or pinouts, so it's essential to review the datasheets for specific application requirements.

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
Package/Case	PDIP (P)-8