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KA3843A
IC REG CTRLR PWM CM 8-DIP
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KA3843A 數據表
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詳細說明
are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting.FEATURES • Low Start-Up and Operating Current • High Current Totem Pole Output • Undervoltage Lockout With Hysteresis • Operating Frequency Up To
主要特徵
- Low Start-Up and Operating Current
- High Current Totem Pole Output
- Undervoltage Lockout With Hysteresis
- Operating Frequency Up To
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。
| Manufacturer | Fairchild Semiconductor | Product Category ! | DC DC Switching Controllers |
數據表 PDF
數據表記錄了器件的特性、絕對最大額定值、應用等，這對於作為器件特定應用的整體指南大有裨益。
常見問題解答
What is KA3843A?
The KA3843A is a current-mode PWM controller specifically designed for off-line and dc-to-dc converter applications. It is commonly used in power supply circuits to regulate voltage and control power delivery efficiently.
How Does KA3843A Work?
The KA3843A operates by comparing the feedback signal from the power output with a reference voltage to regulate the output voltage. It adjusts the duty cycle of the PWM signal to control the power delivered to the load, enabling stable and efficient power supply operation.
How Many Pins does KA3843A have and What are the Functions of the Pinout Configuration?
The KA3843A is housed in an 8-pin DIP (Dual In-line Package) package. The pinout configuration includes:
- VCC: Power supply pin for the internal control circuitry.
- VREF: Reference voltage input pin.
- FEEDBACK: Feedback input pin for monitoring the output voltage.
- COMP: Compensation pin for loop stability adjustment.
- RT/CT: Timing components connection pin for setting the oscillator frequency.
- OUTPUT: Output of the PWM signal.
- GND: Ground pin for the controller.
- OSC: Oscillator output pin for synchronizing external components.
What are the Pros and Cons of KA3843A?
Pros:
- Efficiency: Enables efficient power supply operation through current-mode control.
- Compact Package: Housed in an 8-pin DIP package, suitable for space-constrained applications.
- Stability: Offers stable performance with compensation pin for loop stability adjustment.
- Adjustability: Allows for flexibility in setting the oscillator frequency for different applications.
Cons:
- Limited Functionality: May not include advanced features compared to newer PWM controllers.
- External Components: Requires external components for proper operation and frequency setting.
Are There Any Equivalents/Alternatives to KA3843A for Recommendation?
- The UC3843 from Texas Instruments is a similar current-mode PWM controller that can be used as an alternative to the KA3843A.
- Alternative controllers include the TL3843 from STMicroelectronics and the SG3843 from Fairchild Semiconductor.
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