Thông số kỹ thuật
| thuộc tính | Giá trị |
| Package / Case | Tube |
| Part Status | Not For New Designs |
| Output Type | Transistor Driver |
| Function | Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable |
| Topology | Forward Converter |
| Number of Outputs | 2 |
| Output Phases | 1 |
| Voltage - Supply (Vcc/Vdd) | 8V ~ 15V |
| Frequency - Switching | 200kHz ~ 590kHz |
| Duty Cycle(Max) | 70%, 80% |
| Synchronous Rectifier | No |
| Clock Sync | Yes |
| Control Features | Dead Time Control, Frequency Control, Reset, Soft Start |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
Tổng quan
Description
The LM5026MT is a voltage-mode PWM (Pulse Width Modulation) controller designed by Texas Instruments, primarily used for isolated and non-isolated power supply applications. It supports both single-ended and double-ended topologies, making it versatile for various power supply designs. The LM5026MT is packed in a thermally enhanced TSSOP package.
Key features of the LM5026MT include an integrated 0.5A gate driver capable of driving external MOSFETs, programmable switching frequency, and a synchronization feature to align multiple controllers. It also implements a programmable soft-start to limit inrush current during startup and a cycle-by-cycle current limit for protection against overcurrent conditions.
Additionally, the LM5026MT includes slope compensation to prevent sub-harmonic oscillations, a voltage reference that ensures accuracy, and an undervoltage lockout (UVLO) feature to prevent operation at low input voltages. These features, combined with its efficiency and reliability, make the LM5026MT suitable for telecom, industrial, and consumer power applications.
Key features of the LM5026MT include an integrated 0.5A gate driver capable of driving external MOSFETs, programmable switching frequency, and a synchronization feature to align multiple controllers. It also implements a programmable soft-start to limit inrush current during startup and a cycle-by-cycle current limit for protection against overcurrent conditions.
Additionally, the LM5026MT includes slope compensation to prevent sub-harmonic oscillations, a voltage reference that ensures accuracy, and an undervoltage lockout (UVLO) feature to prevent operation at low input voltages. These features, combined with its efficiency and reliability, make the LM5026MT suitable for telecom, industrial, and consumer power applications.
Equivalent
The LM5026MT is a PWM controller optimized for high-frequency, high-efficiency power conversion in DC-DC converters. Potential equivalent products include:
1. LT3752 from Analog Devices
2. UC3825 from Texas Instruments
3. UC3846 from Texas Instruments
4. NCP1216 from ON Semiconductor
5. UCC28070 from Texas Instruments
These equivalents can vary based on specific application requirements, so cross-referencing datasheets to ensure compatibility is recommended.
1. LT3752 from Analog Devices
2. UC3825 from Texas Instruments
3. UC3846 from Texas Instruments
4. NCP1216 from ON Semiconductor
5. UCC28070 from Texas Instruments
These equivalents can vary based on specific application requirements, so cross-referencing datasheets to ensure compatibility is recommended.
Features
The LM5026MT is a versatile PWM controller designed for high-performance applications, particularly in isolated power supply systems. Key features include:
1. Wide Input Voltage Range: Supports a broad range of input voltages, making it suitable for various power supply configurations.
2. Integrated Start-Up Regulator: Facilitates easier implementation by providing a stable start-up without the need for additional components.
3. Current-Mode Control: Enhances performance and stability by providing cycle-by-cycle current limiting and feedback.
4. Configurable Operating Frequency: Allows for frequency adjustments up to 1 MHz, providing flexibility in design choices and optimization for efficiency or size.
5. Programmable Dead-Time: Offers the ability to optimize efficiency and minimize switching losses by adjusting the dead-time between high and low-side switches.
6. Fault Protection: Includes features like over-voltage, over-current, and thermal shutdown protection to safeguard the system.
7. Synchronization Capability: Can be synced with an external clock source for multi-phase operations or noise reduction.
These features make the LM5026MT an ideal choice for designers looking to implement efficient and reliable power supply solutions.
1. Wide Input Voltage Range: Supports a broad range of input voltages, making it suitable for various power supply configurations.
2. Integrated Start-Up Regulator: Facilitates easier implementation by providing a stable start-up without the need for additional components.
3. Current-Mode Control: Enhances performance and stability by providing cycle-by-cycle current limiting and feedback.
4. Configurable Operating Frequency: Allows for frequency adjustments up to 1 MHz, providing flexibility in design choices and optimization for efficiency or size.
5. Programmable Dead-Time: Offers the ability to optimize efficiency and minimize switching losses by adjusting the dead-time between high and low-side switches.
6. Fault Protection: Includes features like over-voltage, over-current, and thermal shutdown protection to safeguard the system.
7. Synchronization Capability: Can be synced with an external clock source for multi-phase operations or noise reduction.
These features make the LM5026MT an ideal choice for designers looking to implement efficient and reliable power supply solutions.
Pinout
The LM5026MT is a high-performance PWM controller designed for use in isolated DC-DC converters. It is typically available in a TSSOP-16 (Thin Shrink Small Outline Package) with 16 pins. Here's a brief overview of its pin functions:
1. VCC: Supply voltage for the IC.
2. VIN: Vin voltage input.
3. UVLO: Undervoltage lockout pin; monitors the input voltage.
4. COMP: Compensation network pin for error amplifier.
5. FB: Feedback input for regulation.
6. RT: Timing resistor pin to set the oscillator frequency.
7. SYNC: Synchronization input.
8. CS1/CS2: Current sense inputs to monitor the primary side current.
9. OUT_A/OUT_B: Outputs to drive the external power MOSFETs.
10. GND: Ground connection.
11. RES: Restart pin.
12. SS/SD: Soft-start or shutdown control.
13. UTC: Timer control for overcurrent protection.
14. REF: Reference voltage output.
15. RAMP: Ramp signal generator for PWM operation.
These pins work together to provide functionality for voltage regulation, pulse width modulation, and various protection features in power supply applications.
1. VCC: Supply voltage for the IC.
2. VIN: Vin voltage input.
3. UVLO: Undervoltage lockout pin; monitors the input voltage.
4. COMP: Compensation network pin for error amplifier.
5. FB: Feedback input for regulation.
6. RT: Timing resistor pin to set the oscillator frequency.
7. SYNC: Synchronization input.
8. CS1/CS2: Current sense inputs to monitor the primary side current.
9. OUT_A/OUT_B: Outputs to drive the external power MOSFETs.
10. GND: Ground connection.
11. RES: Restart pin.
12. SS/SD: Soft-start or shutdown control.
13. UTC: Timer control for overcurrent protection.
14. REF: Reference voltage output.
15. RAMP: Ramp signal generator for PWM operation.
These pins work together to provide functionality for voltage regulation, pulse width modulation, and various protection features in power supply applications.
Manufacturer
The LM5026MT is manufactured by Texas Instruments, a global technology company known for designing and manufacturing semiconductors and various integrated circuits. Texas Instruments, commonly referred to as TI, is a leader in the electronics industry and provides a wide range of products including digital signal processors, microcontrollers, and analog semiconductors. The company caters to a variety of sectors, including automotive, industrial, personal electronics, communications equipment, and enterprise systems. TI is renowned for its innovation and contributions to the advancement of technology, maintaining a strong focus on research and development to deliver high-performance and efficient products to its customers worldwide.
Application
The LM5026MT is a current-mode PWM controller designed for high-frequency, high-efficiency flyback and forward DC-DC converters. It is commonly used in applications requiring isolated power supplies, such as telecommunications, server power supplies, industrial power systems, and distributed power architectures. The controller supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) operations, making it versatile for various load conditions. Its features, including programmable switching frequency, slope compensation, and integrated protection mechanisms, make it suitable for compact and reliable power supply designs. Additionally, the LM5026MT's synchronization capability enables it to be used in multi-phase converter applications for improved performance and reduced EMI.
Package
The LM5026MT is a high-voltage PWM controller typically used in power conversion applications. It comes in a 16-pin TSSOP (Thin Shrink Small Outline Package) with a thermal pad, which allows for better heat dissipation.
