UC2845AD8

Name: UC2845AD8
Brand: Texas Instruments
Availability: InStock
Rating: 4.5 (10 reviews)
Author: Lisleapex

Switching Controllers Current Mode

6,373 Effective Inventory

UC2845AD8

Effective Inventory6,373

Switching Controllers Current Mode

Manufacturer Part # : UC2845AD8
Package/Case: SOIC-8
Brand: Texas Instruments
Product Categories : Power Supply Controllers, Monitors
Series : UC2845

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UC2845AD8 DataSheet

Pricing (USD)

Quantity	Unit Price	Ext. Price
1	$1.191	$1.19
10	$1.057	$10.57
30	$0.932	$27.96
100	$0.790	$79.00
500	$0.752	$376.00
1000	$0.733	$733.00

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

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UC2845AD8 Details

The UC2845AD8 is a PWM controller from Texas Instruments, designed for reliable power management applications such as DC-DC converters, battery chargers, and LED drivers. This device features optimized performance for off-line and DC-DC converters, making it suitable for industrial and automotive systems.

Pinout

1 (VCC): Positive Power Supply
2 (GND): Ground
3 (A): Non-inverting Input/Output
4 (B): Inverting Input/Output
5 (COMP): Compensation Pin
6 (FB): Feedback Pin
7 (RESET): Reset Pin
8 (SO): Switching Output

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

Key Features

Optimized for Off-Line and DC-DC Converters: Designed for reliable power management applications.
Low Start-Up Current (< 0.5 mA): Ensures efficient power consumption during startup.
Trimmed Oscillator Discharge Current: Provides stable operation and minimizes noise.
Automatic Feedforward Compensation: Enhances stability and reduces oscillations.
High-Frequency PWM Operation: Supports high-frequency switching for efficient power conversion.

Applications

The UC2845AD8 is suitable for various applications, including:

DC-DC converters
Battery chargers
LED drivers
Power supplies

Where to Use

The UC2845AD8 is designed for use in various industries and applications, including:

Industrial automation
Automotive systems
Consumer electronics
Medical devices

How to Use

To use the UC2845AD8, follow these steps:

Connect the VCC and GND pins to a suitable power supply.
Apply a stable clock signal to the A and B inputs.
Configure the COMP and FB pins for feedback control.
Set the RESET pin to initiate startup.

(Tip: For detailed usage instructions, refer to the datasheet.)

Application Circuit

The application circuit diagram for the UC2845AD8 illustrates how to connect the device to a DC-DC converter or other power management application. It includes connections for power supply, ground, and input/output signals.

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

Equivalents

UC2844AD8: A similar PWM controller from Texas Instruments offering comparable features and performance.
LTC3781: An alternative PWM controller from Linear Technology with equivalent functionality.

Complementary

The UC2845AD8 can be complemented by the UC3844A, which offers additional features such as higher current handling and enhanced noise immunity, suitable for more demanding power management applications.

When selecting complementary devices, ensure that their features and specifications align with your specific application requirements for optimal performance and compatibility.

Specifications

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

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

Datasheet PDF

Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.

Preliminary Specification UC2845AD8 PDF Download

FAQs

What is UC2845AD8?

The UC2845AD8 is a high-performance current-mode PWM controller designed by Texas Instruments. It is commonly used in power supply applications to regulate and control the switching of power transistors, making it suitable for offline and DC-DC converter designs.

How Does UC2845AD8 Work?

The UC2845AD8 operates as a current-mode controller, providing precise control over power delivery in switching power supplies. It regulates the duty cycle of the power transistors based on the feedback signal from the output, ensuring stable and efficient power conversion. The controller also features protections such as overcurrent and overvoltage shutdown for system safety.

How Many Pins does UC2845AD8 have and What are the Functions of the Pinout Configuration?

The UC2845AD8 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:

VCC: Power supply pin for the internal circuitry.
CS: Current sense input pin for monitoring the switch current.
RT/CT: Pin for connecting resistor and capacitor to set oscillator frequency.
GND: Ground pin.
Comp: Compensation pin for loop stability.
SD: Shutdown pin for control functionality.
Out: Output pin for driving external power transistors.

What are the Pros and Cons of UC2845AD8?

Pros:

High Performance: Offers precise current-mode control for efficient power regulation.
Wide Voltage Range: Supports a wide input voltage range for versatile application use.
Protections: Includes overcurrent and overvoltage protections for system safety.
Efficiency: Optimizes power conversion efficiency in switching power supply designs.
Compact Size: Housed in an 8-pin package, suitable for space-constrained designs.

Cons:

External Components: May require external components for specific applications and to achieve desired performance.
Complexity: Requires careful design considerations for loop stability and compensation.
Heat Dissipation: Efficiency comes at the cost of heat generation in high-power applications.

Are There Any Equivalents/Alternatives to UC2845AD8 for Recommendation?

The SG3525 from STMicroelectronics is an equivalent current-mode PWM controller.
Alternatives to the UC2845AD8 include the TL494 from Texas Instruments and the IR2153 from Infineon Technologies.