KA3845B

Name: KA3845B
Brand: Onsemi
Rating: 4.5 (10 reviews)
Author: Lisleapex

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 Effective Inventory

KA3845B

Effective Inventory6,397

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

Manufacturer Part # : KA3845B
Package/Case: DIP-8
Part Status : Obsolete
Brand: Onsemi
Product Categories : AC DC Converters, Offline Switches

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KA3845B DataSheet

Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!

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KA3845B Details

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

Key Features

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

Application

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

Specifications

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

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

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 KA3845B PDF Download

FAQs

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.