company blog about TI LM5025AMTCX 90V Active Clamp Voltage Mode PWM Controller With Clamp FET

TI LM5025AMTCX 90V Active Clamp Voltage Mode PWM Controller With Clamp FET

Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned distributor of electronic components, comprehensively supplies the TI LM5025AMTCX 90V active clamp voltage-mode PWM controller, providing power supply design engineers with highly efficient power management solutions.

【LM5025AMTCX Overview】

The LM5025AMTCX is a 90V active clamp voltage-mode PWM controller specifically designed for high-efficiency power conversion solutions. This chip, housed in a TSSOP-16 package, operates across a wide input voltage range of 13V to 90V. It integrates all functions required for active clamp reset technology, significantly enhancing system efficiency and power density compared to traditional forward converters.

The LM5025AMTCX delivers comprehensive power management solutions for applications including server power supplies, 48V telecom power systems, 42V automotive power systems, and high-efficiency DC-DC converters. It incorporates an internal high-voltage start-up bias regulator, enabling operation without an external auxiliary power source and substantially simplifying peripheral circuit design.

Operating at frequencies ranging from 200kHz to 580kHz with a maximum duty cycle of 80%, the LM5025AMTCX utilises a compact TSSOP-16 package to effectively conserve PCB space.

【LM5025AMTCX Specifications】

Output Type: Transistor Driver

Function: Boost/Buck

Output Configuration: Positive Output, Isolation Supported

Topology: Forward converter

Number of output channels: 2

Output phase: 1

Supply voltage (Vcc/Vdd): 8V to 15V

Switching frequency: 200kHz to 580kHz

Duty cycle (maximum): 80%

Synchronous rectification: None

Clock synchronisation: Yes

Control features: Dead time control, frequency control, ramp control, soft start

Operating Temperature: -40°C to 125°C (TJ)

【LM5025AMTCX Product Features】

The LM5025AMTCX incorporates multiple control features, including no-load time control, frequency control, slope compensation, and soft-start functionality. These features enable designers to optimise the performance and reliability of power supply systems.

The LM5025AMTCX provides two control outputs: main power switch control (OUT_A) and active clamp switch control (OUT_B).

This architecture permits simultaneous driving of MOS and bipolar devices, offering a flexible solution for active clamp circuits.

The LM5025AMTCX supports a programmable line under-voltage lockout (UVLO) function with adjustable hysteresis, enhancing system stability.

It also provides programmable dual-mode overcurrent protection, programmable soft-start, and volt-second clamping to ensure safe operation of the power supply system.

【Key Technical Features of LM5025AMTCX】

The LM5025AMTCX integrates multiple advanced functions, delivering outstanding performance in power supply system design:

Robust Drive Capability: An integrated 3A composite main gate driver directly drives high-power MOSFETs, reducing PCB footprint and enhancing power density. The composite driver accommodates both MOS and bipolar devices, providing excellent gate drive characteristics.

Flexible Voltage-Mode Control: Employing voltage-mode control with feedforward simplifies loop compensation design and enhances system stability. This control method exhibits low sensitivity to noise, delivering more stable output voltage.

Comprehensive Protection Features: Provides programmable dual-mode overcurrent protection, under-voltage lockout (UVLO) with adjustable hysteresis, programmable soft-start, volt-second clamping, and thermal shutdown protection, ensuring safe system operation under various abnormal conditions.

High-Precision Timing Control: Programmable overlap or dead time between the main output (OUT_A) and clamp output (OUT_B) allows flexible configuration for P-channel or N-channel clamp FETs. This feature enables designers to optimise power efficiency and prevent through-current.

High-frequency operation capability: Supports switching frequencies up to 1MHz with total PWM and current sense propagation delay under 100ns, suitable for high power density designs. Controller switching frequency range spans 200kHz to 580kHz.

【LM5025AMTCX Typical Applications】

The LM5025AMTCX is primarily employed in active clamp forward converter topologies. Typical application scenarios include:

1. Active Clamp Forward Converter

The LM5025AMTCX enables the construction of highly efficient active clamp forward converters. In this configuration, the controller's OUT_A pin drives the main power switch (MOSFET), while the OUT_B pin drives the clamp switch. By precisely controlling the timing between the two switches, the transformer's magnetisation energy is effectively reset, limiting voltage stress on the power MOSFET while enabling higher duty cycle operation.

2. Telecommunications Power Systems

Within 48V telecom power systems, the LM5025AMTCX's wide input voltage range (13V-90V) enables it to withstand voltage fluctuations inherent in telecom environments, delivering stable and reliable power conversion. Its high-frequency operation capability facilitates reduced power supply footprint, meeting the high power density demands of telecommunications equipment.

3. Automotive Power Modules

For 42V automotive power systems, the controller's high-voltage capability and comprehensive protection features enable adaptation to demanding automotive electronics environments, including load dump and cold start scenarios.

4. Server Power Supplies

In server power applications, the LM5025AMTCX's high efficiency and dual-mode overcurrent protection enhance system reliability, ensuring prolonged stable server operation.