UC3843AD8

8-SOIC package with 8.4V/7.6V UVLO
3,896 有效庫存

UC3843AD8

有效庫存3,896

8-SOIC package with 8.4V/7.6V UVLO

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UC3843AD8 數據表
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詳細說明

Revolutionize your power supply designs with the UC3843AD8, a cutting-edge control device that combines advanced features with unmatched performance. Perfect for current-mode or switched-mode power supplies, this device is a game-changer in the world of power electronics. With its low startup current, finely tuned oscillator discharge trimming, and powerful output stage, the UC3843AD8 sets a new standard for efficiency and reliability. Whether you're working on a commercial project or a personal DIY endeavor, this device is sure to elevate your design and take it to the next level. Trust the UC3843AD8 to deliver superior results and transform your power supply applications

主要特徵

  • Superior soft-start performance
  • Rapid power supply settling time
  • Protected from thermal overload
  • Avoids damage from undervoltage

應用

  • High efficiency power supplies
  • Versatile LED drivers
  • Popular motor control chip

規格

以下是所選零件的基本參數，涉及零件的特性及其所屬類別。

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

常見問題解答

What is UC3843AD8?

The UC3843AD8 is a current-mode PWM (Pulse Width Modulation) controller integrated circuit designed by Texas Instruments. It is commonly used in power supply applications to regulate the output voltage or current through controlling the duty cycle of a switching power supply.

How Does UC3843AD8 Work?

The UC3843AD8 works by comparing a feedback signal representing the output voltage or current with a reference voltage. Based on this comparison, it adjusts the duty cycle of the PWM signal sent to the power switch, regulating the power supply output. The device operates in a current-mode control scheme, providing inherent stability and ease of compensation in feedback loops.

How Many Pins does UC3843AD8 have and What are the Functions of the Pinout Configuration?

The UC3843AD8 is housed in an 8-pin dual in-line package (DIP). The pinout configuration includes:

  • VCC: Supply voltage input pin for the internal control circuits.
  • CS: Current sense input for monitoring the current in the power switch.
  • RT/CT: Pin for connecting the timing resistor (RT) and timing capacitor (CT) to set the oscillator frequency.
  • OUT: PWM output pin that connects to the power switch.
  • GND: Ground pin for the IC.

What are the Pros and Cons of UC3843AD8?

Pros:

  • Efficient Power Regulation: Provides precise control over power supply output voltages or currents.
  • Current-Mode Control: Ensures stable operation and simplifies feedback loop design.
  • Wide Operating Voltage Range: Can work with a variety of supply voltages.
  • Cost-Effective: Offers a cost-effective solution for power supply control applications.
  • Protection Features: May include built-in protection mechanisms for overcurrent and overvoltage conditions.

Cons:

  • External Components: May require external components such as resistors and capacitors for setting oscillator frequency and compensation.
  • Noisy Environments: Sensitivity to noise may require additional filtering or shielding.
  • Application Specific: Primarily designed for power supply applications and may not be suitable for other types of circuits.

Are There Any Equivalents/Alternatives to UC3843AD8 for Recommendation?

  • The UC3842A and UC3844A are variations of the UC3843 with slightly different features and specifications.
  • Alternatives to the UC3843AD8 include the TL494 from Texas Instruments and the SG3525A from ON Semiconductor.

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