KA3845B

The KA3845B is an 8-pin PDIP current mode PWM controller capable of delivering up to 1A of output current, with the option for rail mounting
6,397 有效庫存

KA3845B

有效庫存6,397

The KA3845B is an 8-pin PDIP current mode PWM controller capable of delivering up to 1A of output current, with the option for rail mounting

  • 製造商零件號 # : KA3845B

  • 包裝/封裝: DIP-8

  • 零件狀態 : Obsolete

  • 製造商: Onsemi

  • 產品分類 : AC DC Converters, Offline Switches

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KA3845B 數據表
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詳細說明

With its high-frequency capability of up to 500 kHz and compatibility with various transistor configurations, the KA3845B offers a wide range of possibilities for power supply implementations. Its wide operating temperature range and convenient 16-pin DIP package further enhance its appeal for designers seeking a robust and adaptable PWM controller solution

主要特徵

  • Internal Regulator Provides a Stable 5V Reference Voltage
  • Output Drivers Capable of Sinking or Sourcing 200mA
  • Low Start-Up Current (1mA Max)
  • Adjustable Pulse-by-Pulse Current Limiting
  • Automatic Feed-Forward Compensation
  • Enable Input and Error Amplifier with Latch

應用

  • Switch mode power supplies
  • LED lighting systems
  • Battery chargers
  • DC-DC converters
  • AC-DC converters
  • Solar inverters
  • Motor control systems
  • Uninterruptible power supplies (UPS)
  • Audio amplifiers
  • Industrial control systems

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。

Part Life Cycle Code Active Reach Compliance Code compliant
ECCN Code EAR99 HTS Code ! 8542.39.00.01
Date Of Intro 2017-10-12 Analog IC - Other Type SWITCHING CONTROLLER
Control Mode CURRENT-MODE Control Technique PULSE WIDTH MODULATION
Input Voltage-Max 25 V Input Voltage-Min 8.2 V
Input Voltage-Nom 15 V JESD-30 Code R-PDIP-T8
Length 9.2 mm Number of Functions 1
Number of Terminals 8 Operating Temperature-Max 70 °C
Operating Temperature-Min Output Current-Max 1 A
Package Body Material PLASTIC/EPOXY Package Code DIP
Package Shape RECTANGULAR Package Style IN-LINE
Seated Height-Max 5.08 mm Surface Mount ! NO
Temperature Grade ! COMMERCIAL Terminal Form ! THROUGH-HOLE
Terminal Pitch ! 2.54 mm Terminal Position DUAL
Width 7.62 mm Manufacturer onsemi
Product Category ! Switching Controllers RoHS Details
Number of Outputs 1 Output Switching Frequency ! 500 kHz
Duty Cycle - Max 50 % Output Current ! 1 A
Minimum Operating Temperature 0 C Maximum Operating Temperature ! + 70 C
Mounting Style Through Hole Package / Case DIP-8
Brand onsemi / Fairchild Fall Time 35 ns
Operating Supply Current 17 mA Product Type ! Switching Controllers
Rise Time ! 45 ns Factory Pack Quantity 50
Subcategory PMIC - Power Management ICs Type Current Mode PWM Controllers
Part # Aliases KA3845B_NL Unit Weight 0.032805 oz

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。

初步規格 KA3845B PDF 下載

常見問題解答

What is KA3845B?

The KA3845B is a PWM (Pulse Width Modulation) controller integrated circuit designed for power supply and motor control applications. It is commonly used in switch-mode power supplies, DC-DC converters, and motor speed control circuits.

How Does KA3845B Work?

The KA3845B works by generating pulse width modulated signals based on the input voltage and control signals. It regulates the output voltage or motor speed by dynamically adjusting the width of the pulses, providing efficient power transfer and precise motor control. The integrated circuit also includes protection features such as overcurrent and overvoltage protection for enhanced system reliability.

How Many Pins does KA3845B have and What are the Functions of the Pinout Configuration?

The KA3845B is housed in a 16-pin PDIP (Plastic Dual In-line Package) package. The pinout configuration includes:

  • VREF: Reference voltage input for error amplifier.
  • VCC: Power supply voltage pin.
  • RT/CT: External resistor or capacitor connection for oscillator frequency setting.
  • DIS: Output driver disable pin.
  • COMP: Error amplifier output pin.
  • CS: Current sense input pin.
  • SD, GND: Shutdown and ground pins, respectively.
  • OUTPUT: PWM output pin.

What are the Pros and Cons of KA3845B?

Pros:

  • Wide Application Range: Suitable for various power supply and motor control applications.
  • Efficient Power Conversion: Enables efficient power transfer in switch-mode power supplies.
  • Protection Features: Includes overcurrent and overvoltage protection for enhanced system reliability.
  • Simple External Circuitry: Requires minimal external components for basic operation.
  • Cost-Effective: Provides cost-effective control for power supply and motor applications.

Cons:

  • External Components: May require additional external components for specific application requirements.
  • Noisy Operation: PWM controllers may introduce noise in some applications.
  • Thermal Considerations: Requires thermal management for heat dissipation in high-power applications.

Are There Any Equivalents/Alternatives to KA3845B for Recommendation?

  • The UC3845B from Texas Instruments is a direct alternative to the KA3845B.
  • Alternatives to the KA3845B include the SG3525A from STMicroelectronics and the TL494 from Texas Instruments.

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