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UC2843AD +BOM

30-V, 1-A, 500KHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle 40°C to 85°C

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UC2843AD
Datasheet:

UC2843AD Datasheet (PDF)
Series: UC2843A
Topology:

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

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

100
EDA/CAD Models:

Request Free CAD Models for UC2843AD

UC2843AD Information

Description

The UC2843AD is a PWM current mode controller from Texas Instruments, designed for high-speed operation in boost, flyback, and buck converter applications. It features a wide input voltage range, adjustable output voltage, overcurrent protection, programmable soft-start, and under-voltage lockout. This device is commonly used in power supply applications such as offline buck converters, DC-DC converters, and LED drivers due to its high efficiency and low power consumption.

Features

The UC2843AD features include:

High speed operation
Wide input voltage range
Current-mode control
Adjustable output voltage
Overcurrent protection
Programmable soft-start feature
Under-voltage lockout
Precision reference voltage

These features make it suitable for use in power supply applications such as offline buck converters, DC-DC converters, and LED drivers, as well as motor control, battery chargers, and solar inverters.

Package

The package type of UC2843AD is a 14-SOIC (0.154", 3.90mm Width).

Pinout

The UC2843AD has a 14-pin SOIC package. The pin functions are:

Pin 1: VCC (positive supply voltage)
Pin 2: GND (ground)
Pin 3: OUT (output)
Pin 4: COMP (comparator input)
Pin 5: FB (feedback input)
Pin 6: RST (reset input)
Pin 7: UVLO (under-voltage lockout input)
Pin 8: SOFT (soft-start output)
Pin 9-13: Unused
Pin 14: GND (ground)

This PWM current-mode controller is designed for high-speed operation and has a wide input voltage range, making it suitable for various power supply applications.

Manufacturer

The manufacturer of the UC2843AD is Texas Instruments (TI), a leading American technology company that designs, manufactures, and tests semiconductors and other electronic components. TI is a global semiconductor leader with a broad portfolio of innovative solutions, including analog power management, embedded processing, and connectivity.

Applications

The UC2843AD is commonly used in power supply applications such as offline buck converters, DC-DC converters, and LED drivers. It's also used in motor control, battery chargers, and solar inverters due to its high efficiency and low power consumption.

Equivalent

Based on the product information, the equivalent products of UC2843AD are:

STP14NF50 (STMicroelectronics)
NCP3801 (ON Semiconductor)
LM5114 (Texas Instruments)

These devices share similar features such as high-speed operation, current-mode control, and adjustable output voltage, making them suitable alternatives for power supply applications.

Specifications

Topology	Boost, Buck, Buck boost, Flyback, Forward	Control mode	Peak current mode
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)	-40 to 85	Rating	Catalog
Gate drive (typ) (A)	1	Vin (max) (V)	28
feature-type	Current Mode PWM Controller	feature-control-method	Current
feature-topology	Boost\|Buck\|Flyback\|Forward	feature-number-of-pwm-outputs	1
feature-switching-frequency-khz	500	feature-maximum-duty-cycle-	100
feature-process-technology		feature-output-voltage-v	-0.1 to 11
feature-minimum-operating-supply-voltage-v		feature-maximum-operating-supply-voltage-v	30
feature-maximum-supply-current-ma	25	feature-maximum-power-dissipation-mw	1000
feature-synchronous-pin	No	feature-packaging	Tube
feature-rad-hard		feature-pin-count	14
feature-cecc-qualified	No	feature-esd-protection	Yes
feature-escc-qualified		feature-military	No
feature-aec-qualified	No	feature-aec-qualified-number
feature-eccn-code	EAR99	feature-svhc	No
feature-svhc-exceeds-threshold	No	Package/Case	SOP14