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LM5025B Datasheet(PDF) 1 Page - Texas Instruments |
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LM5025B Datasheet(HTML) 1 Page - Texas Instruments |
1 / 24 page LM5025B www.ti.com SNVS354B – JULY 2005 – REVISED MARCH 2013 LM5025B Active Clamp Voltage Mode PWM Controller Check for Samples: LM5025B 1 FEATURES DESCRIPTION The LM5025B is a functional variant of the LM5025 2 • Internal Start-Up Bias Regulator active clamp PWM controller. The functional • 3A Compound Main Gate Driver differences of the LM5025B are as follows: • Programmable Line Under-Voltage Lockout • The maximum PWM duty cycle is limited to less (UVLO) with Adjustable Hysteresis than 75% to reduce voltage stress on the power MOSFETs. • Voltage Mode Control with Feed-Forward • The CS2 hiccup mode threshold is increased to • Adjustable Dual Mode Over-Current Protection 0.5V • Programmable Overlap or Deadtime between • The CS2 filter discharge device is disabled the Main and Active Clamp Outputs • The VCC regulator continues to operate when the • Volt x Second Maximum Duty Cycle Clamp line UVLO is below the threshold of normal • Programmable Soft-Start operation • Current Sense Leading Edge Blanking • The VREF regulator is switched off when the line UVLO input falls below the operating threshold • Single Resistor Programmable Oscillator • The internal 5k Ω COMP pin pull-up resistor is • Oscillator Up / Down Sync Capability removed • Precision 5V Reference The LM5025B PWM controller contains all of the • Thermal Shutdown features necessary to implement power converters utilizing the Active Clamp / Reset technique. With the PACKAGES active clamp technique, higher efficiencies and • TSSOP-16 greater power densities can be realized compared to conventional catch winding or RDC clamp / reset • WSON-16 (5x5 mm) Thermally Enhanced techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The two internal compound gate drivers parallel both MOS and Bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1MHz and total PWM and current sense propagation delays less than 100ns. The LM5025B includes a high-voltage start-up regulator that operates over a wide input range of 13V to 100V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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