LT3753IFE#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High voltage flyback controller - Wide input voltage range - Adjustable output voltage - Current mode control - Internal 2A, 150V power switch - Programmable soft-start - Fault protection features

Package: 16-Lead TSSOP

Essence: The LT3753IFE#TRPBF is a high voltage flyback controller designed for power management applications. It provides a wide input voltage range and adjustable output voltage, making it suitable for various power supply designs.

Packaging/Quantity: The LT3753IFE#TRPBF is available in a 16-Lead Thin Shrink Small Outline Package (TSSOP). It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 4.5V to 100V
• Output Voltage Range: Up to 150V
• Switching Frequency: Adjustable up to 1MHz
• Maximum Duty Cycle: 90%
• Soft-Start Time: Programmable
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT3753IFE#TRPBF has 16 pins arranged as follows:

1. VCC: Supply voltage input
2. GND: Ground reference
3. FB: Feedback pin for output voltage regulation
4. COMP: Compensation pin for loop stability
5. SS: Soft-start pin for controlling the startup time
6. RT/CLK: External resistor or clock input for setting switching frequency
7. SYNC/PLL: Synchronization or phase-locked loop input
8. SD: Shutdown pin for enabling/disabling the device
9. VSENSE: Current sense input for current mode control
10. VCCSENSE: Supply voltage sense input for undervoltage lockout
11. VOUT: Output voltage pin
12. SW: Switch node connection to the power switch
13. GATE: Gate drive output for external MOSFET
14. AGND: Analog ground reference
15. VIN: Input voltage pin
16. VREF: Reference voltage output

Functional Features

• High voltage flyback controller for power management applications
• Wide input voltage range allows for versatile designs
• Adjustable output voltage to meet specific requirements
• Current mode control for improved stability and transient response
• Internal 2A, 150V power switch simplifies the design
• Programmable soft-start feature for controlled startup
• Fault protection features ensure safe operation

Advantages and Disadvantages

Advantages: - Wide input voltage range enables flexibility in power supply designs - Adjustable output voltage accommodates various application needs - Current mode control enhances stability and transient response - Internal power switch simplifies the circuit design - Programmable soft-start feature ensures controlled startup - Fault protection features enhance reliability and safety

Disadvantages: - Limited maximum duty cycle of 90% - Requires careful consideration of thermal management due to high voltage operation

Working Principles

The LT3753IFE#TRPBF operates as a high voltage flyback controller. It regulates the output voltage by controlling the switching of an external MOSFET connected to the primary side of a transformer. The device uses current mode control to maintain stable operation and improve transient response.

During operation, the LT3753IFE#TRPBF senses the current flowing through the primary winding of the transformer using the VSENSE pin. It compares this current with a reference voltage and adjusts the duty cycle of the switching waveform accordingly. This control mechanism ensures that the desired output voltage is maintained.

The device also incorporates fault protection features such as undervoltage lockout, overvoltage protection, and overcurrent protection. These features help safeguard the power supply and connected components from potential damage.

Detailed Application Field Plans

The LT3753IFE#TRPBF is suitable for a wide range of power management applications, including but not limited to: - Industrial power supplies - Telecom infrastructure - Automotive electronics - LED lighting - Battery charging systems - Distributed power architectures

Detailed and Complete Alternative Models

Some alternative models that can be considered for similar applications include: - LT3754: High voltage flyback controller with additional features - LT8301: Isolated flyback controller with integrated power switch - LT3748: High voltage synchronous step-down controller - LT3799: High voltage isolated flyback controller with active PFC

These alternative models offer different specifications and features, allowing designers to choose the most suitable option for their specific requirements.

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