KA3845B

Product Overview

Category: Integrated Circuit (IC)

Use: The KA3845B is a PWM controller IC primarily used in switch-mode power supply applications. It provides the necessary control signals for regulating the output voltage of power supplies.

Characteristics: - High-frequency operation - Wide input voltage range - Adjustable duty cycle - Current limiting protection - Overvoltage protection

Package: The KA3845B is available in a standard 8-pin dual in-line package (DIP) or a surface mount package (SMD).

Essence: The essence of the KA3845B lies in its ability to efficiently regulate and control the output voltage of power supplies, ensuring stable and reliable operation.

Packaging/Quantity: The KA3845B is typically sold in reels or tubes, with quantities varying depending on the supplier.

Specifications

Input Voltage Range: 8V to 35V
Output Voltage Range: 5V to 30V
Maximum Duty Cycle: 50%
Operating Frequency: 100kHz to 500kHz
Quiescent Current: 10mA
Temperature Range: -40°C to +85°C

Pin Configuration

The KA3845B features an 8-pin configuration:

VCC: Power supply voltage input
GND: Ground reference
COMP: Compensation pin for feedback control loop
CS: Current sense input for current limiting
RT/CT: Timing resistor/capacitor connection for frequency control
OUT: Output pin for driving external power transistor
FB: Feedback pin for voltage regulation
REF: Reference voltage output

Functional Features

Pulse Width Modulation (PWM) control
Voltage feedback regulation
Current limiting protection
Overvoltage protection
Frequency control through external timing components

Advantages and Disadvantages

Advantages: - High efficiency power supply regulation - Wide input voltage range - Adjustable duty cycle for flexible output voltage control - Built-in protection features for enhanced reliability

Disadvantages: - Limited maximum duty cycle of 50% - Requires external timing components for frequency control

Working Principles

The KA3845B operates on the principle of pulse width modulation (PWM). It compares the feedback voltage with a reference voltage to generate a control signal that adjusts the duty cycle of the PWM waveform. This control signal is then used to regulate the output voltage of the power supply.

Application Field Plans

The KA3845B finds extensive use in various switch-mode power supply applications, including: - AC-DC converters - DC-DC converters - LED drivers - Battery chargers - Inverters

Alternative Models

Some alternative models to the KA3845B include: - UC3845 - SG3525 - TL494 - IRS2153D

These models offer similar functionality and can be used as replacements depending on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací KA3845B v technických řešeních

Sure! Here are 10 common questions and answers related to the application of KA3845B in technical solutions:

Q: What is KA3845B? A: KA3845B is a PWM controller IC (Integrated Circuit) commonly used in power supply applications.
Q: What is the purpose of KA3845B in a power supply circuit? A: The KA3845B is used to regulate the output voltage of a power supply by controlling the duty cycle of a switching transistor.
Q: How does KA3845B control the duty cycle? A: The KA3845B uses a feedback loop to compare the actual output voltage with a reference voltage, adjusting the duty cycle accordingly.
Q: Can KA3845B be used in both AC and DC power supplies? A: Yes, KA3845B can be used in both AC and DC power supply circuits.
Q: What is the maximum input voltage that KA3845B can handle? A: The maximum input voltage for KA3845B is typically around 40V.
Q: Is KA3845B suitable for high-power applications? A: KA3845B is commonly used in low to medium power applications. For high-power applications, it may be necessary to use multiple ICs or a different controller.
Q: Can KA3845B be used in battery charging circuits? A: Yes, KA3845B can be used in battery charging circuits by regulating the charging voltage and current.
Q: Does KA3845B have built-in protection features? A: Yes, KA3845B has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.
Q: Can KA3845B be used in both isolated and non-isolated power supply designs? A: Yes, KA3845B can be used in both isolated (flyback, forward) and non-isolated (buck, boost) power supply designs.
Q: Are there any application notes or reference designs available for KA3845B? A: Yes, the manufacturer of KA3845B provides application notes and reference designs that can help in implementing the IC in various technical solutions.

Please note that these answers are general and may vary depending on specific design requirements and datasheet specifications.