LT3845MPFE#TRPBF

Product Overview

Category

The LT3845MPFE#TRPBF belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

This IC is commonly used in various power supply designs, including offline flyback converters and isolated DC-DC converters.

Characteristics

• High efficiency: The LT3845MPFE#TRPBF offers high efficiency power conversion, minimizing energy loss.
• Wide input voltage range: It can operate with input voltages ranging from 4.5V to 100V, making it suitable for a wide range of applications.
• Adjustable output voltage: The output voltage can be easily adjusted using external components.
• Current mode control: This IC utilizes current mode control, providing excellent line and load regulation.

Package

The LT3845MPFE#TRPBF is available in a compact and industry-standard 16-pin TSSOP package, which ensures ease of integration into various circuit designs.

Essence

The essence of the LT3845MPFE#TRPBF lies in its ability to efficiently regulate and convert power in a wide range of applications, offering flexibility and reliability.

Packaging/Quantity

This IC is typically packaged in reels, containing a quantity of 250 units per reel.

Specifications

• Input Voltage Range: 4.5V to 100V
• Output Voltage Range: Adjustable
• Maximum Switching Frequency: 500kHz
• Operating Temperature Range: -40°C to 125°C
• Package Type: 16-pin TSSOP

Detailed Pin Configuration

1. VCC: Power supply input pin.
2. GND: Ground reference pin.
3. FB: Feedback pin for output voltage regulation.
4. COMP: Compensation pin for loop stability.
5. SS/TR: Soft-start and tracking pin.
6. SYNC/SS: Synchronization and soft-start pin.
7. RT/CLKOUT: External resistor connection for frequency control or clock output.
8. CLKIN: Clock input pin.
9. VCCSENSE: Voltage sense pin for VCC regulation.
10. VIN: Input voltage pin.
11. SW: Switching node pin.
12. SW: Switching node pin.
13. SW: Switching node pin.
14. SW: Switching node pin.
15. NC: No connection pin.
16. NC: No connection pin.

Functional Features

• Current mode control: Provides excellent line and load regulation, ensuring stable power conversion.
• Soft-start and tracking: Allows controlled startup and tracking of the output voltage, preventing excessive inrush current.
• Synchronization: Enables synchronization with an external clock source, facilitating system integration.
• Frequency control: The switching frequency can be adjusted using an external resistor, allowing optimization for different applications.
• Overcurrent protection: Incorporates overcurrent protection to safeguard against excessive currents.

Advantages and Disadvantages

Advantages

• High efficiency power conversion.
• Wide input voltage range.
• Adjustable output voltage.
• Excellent line and load regulation.
• Compact package size.

Disadvantages

• Requires external components for voltage adjustment and frequency control.
• Limited pin configuration options.

Working Principles

The LT3845MPFE#TRPBF operates based on a current mode control architecture. It regulates the output voltage by monitoring the current flowing through the power switch and adjusting the duty cycle accordingly. This control mechanism ensures stable power conversion and efficient energy transfer.

Detailed Application Field Plans

The LT3845MPFE#TRPBF finds application in various power supply designs, including but not limited to: - Offline flyback converters for AC-DC power supplies. - Isolated DC-DC converters for industrial and automotive applications. - LED lighting drivers. - Telecom power supplies. - Battery charging systems.

Detailed and Complete Alternative Models

1. LT3845A: Similar to LT3845MPFE#TRPBF, but with extended temperature range (-40°C to 150°C).
2. LT3845B: Enhanced version with additional features such as adjustable soft-start time and external clock synchronization.
3. LT3845C: Higher switching frequency variant for applications requiring faster response times.
4. LT3845D: Lower voltage range option suitable for low-power applications.

These alternative models provide flexibility in selecting the most suitable IC based on specific application requirements.

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