UC3842D

Name: UC3842D
Brand: Texas Instruments
Availability: InStock
Rating: 4.5 (10 reviews)
Author: Lisleapex

Switching Controllers Current Mode

7,661 Effective Inventory

UC3842D

Effective Inventory7,661

Switching Controllers Current Mode

Manufacturer Part # : UC3842D
Package/Case: SOIC-14
Part Status : ACTIVE
Brand: Texas Instruments
Series : UC3842
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UC3842D DataSheet

Pricing (USD)

Quantity	Unit Price	Ext. Price
1	$1.317	$1.32
10	$1.174	$11.74
30	$1.039	$31.17
100	$0.940	$94.00
500	$0.898	$449.00
1000	$0.879	$879.00

These prices are subject to market fluctuations, and a quote submission is required to obtain the latest prices.

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UC3842D Details

The UC3842D is a high-performance voltage mode PWM controller developed by Texas Instruments, designed for power supply and converter applications. It provides excellent regulation of the output voltage, ensuring efficiency and stability in various electronic systems. With a built-in oscillator and high-speed output stage, the UC3842D is ideal for switch-mode power supplies and other demanding applications.

Pinout

1 (Vref): Reference Voltage Output
2 (Vcc): Supply Voltage
3 (GND): Ground
4 (CS): Current Sense Input
5 (COMP): Compensation Node
6 (CT): Timing Capacitor Node
7 (OUT): PWM Output
8 (RT): Timing Resistor Node

(Tip: For detailed pinout information, please refer to the corresponding datasheet.)

Key Features

High Speed Operation: Capable of high-speed switching for improved efficiency.
Voltage Regulation: Provides precise voltage regulation for stable output.
Built-in Oscillator: Integrated oscillator simplifies circuit design.
Wide Range of Applications: Suitable for various DC-DC converters and power supply designs.
Low Power Consumption: Optimized for low power usage, enhancing overall system efficiency.

Application

Switch-Mode Power Supplies: Ideal for designing efficient power supplies that convert DC voltages.
DC-DC Converters: Used in various DC-DC converter configurations for voltage regulation.
Battery Chargers: Suitable for designing battery charging systems with high efficiency.

Where to Use

The UC3842D is ideal for applications requiring efficient power conversion and voltage regulation. Its versatility makes it suitable for both consumer electronics and industrial applications.

How to Use

Connect the UC3842D by wiring the Vcc and GND pins to the appropriate power supply and ground connections. Utilize the COMP, CS, and timing pins to regulate and stabilize the PWM output correctly. For precise usage and circuit configurations, refer to the datasheet.

Application Circuit

The application circuit diagram for the UC3842D illustrates how to set up the PWM controller in a power supply design. It includes connections for power supply, control loops, and other key components necessary for optimal operation.

(Tip: For detailed circuit diagram connections and usage guide, refer to the datasheet.)

Equivalents

UC3843: A similar voltage mode PWM controller with slightly different specifications and capabilities.
TL494: An alternative PWM controller offering versatile control features and applications.

Complementary

The UC3842D can be complemented by the UC3845, which offers advanced features such as better frequency modulation and higher current handling, suitable for more demanding power applications.

When selecting complementary controllers, ensure their operational specifications align with your system requirements for optimal performance.

Frequently Asked Questions

Q: What is the maximum frequency of the UC3842D?

A: The UC3842D can operate at frequencies up to 100 kHz. For more detailed information on frequency settings and limitations, refer to the datasheet.

Q: Can the UC3842D be used in battery charger applications?

A: Yes, the UC3842D is well-suited for battery charging circuits, providing efficient voltage regulation and control to ensure safe charging of batteries.

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

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)	16/10
Operating temperature range (°C)	0 to 70	Rating	Catalog
Gate drive (typ) (A)	1	Vin (max) (V)	28

FAQs

What is UC3842D?

The UC3842D is a pulse width modulation (PWM) controller IC (integrated circuit) designed for controlling switch mode power supplies. It is commonly used in applications such as DC-DC converters, battery chargers, and LED drivers.

How Does UC3842D Work?

The UC3842D operates by generating a PWM signal based on the input voltage and feedback from the power supply output. This signal controls the switching of power transistors to regulate the output voltage efficiently.

How Many Pins does UC3842D have and What are the Functions of the Pinout Configuration?

The UC3842D is typically available in a 16-pin SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:

VCC: Power supply pin for the IC.
GND: Ground pin.
COMP: Compensation pin for external frequency compensation.
RT/CT: Pin for connecting resistor and capacitor to set oscillator frequency.
CS: Current sense pin for sensing the switch current.
SS/SD: Soft start or shutdown pin.
OUT: Output pin for driving external power transistors.
FB: Feedback pin for regulating the output voltage.
REF: Reference pin.

What are the Pros and Cons of UC3842D?

Pros:

High Efficiency: Enables efficient power conversion due to PWM control.
Wide Application Range: Suitable for a variety of switch mode power supply designs.
Internal Oscillator: Integrated oscillator reduces external component count.
Protections: Built-in protections such as overcurrent protection enhance reliability.

Cons:

External Components: May require additional external components like resistors and capacitors for operation.
Complexity: Requires understanding of PWM principles and circuit design for optimal performance.

Are There Any Equivalents/Alternatives to UC3842D for Recommendation?

The UC3843D and UC3844D are variants with different features and performance characteristics.
Alternatives include the TL494 from Texas Instruments and the SG3525A from STMicroelectronics.