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LM5025 Datasheet(PDF) 1 Page - Texas Instruments |
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LM5025 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 23 page LM5025 UVLO PGND AGND COMP OUT_A OUT_B VCC SS Rt SYNC REF TIME RAMP CS1 VIN CS2 VIN 35 - 78V VOUT 3.3V UP/DOWN SYNC ERROR AMP & ISOLATION LM5025 www.ti.com SNVS265B – DECEMBER 2003 – REVISED MARCH 2013 Active Clamp Voltage Mode PWM Controller Check for Samples: LM5025 1 FEATURES DESCRIPTION The LM5025 PWM controller contains all of the 2 • Internal Start-up Bias Regulator features necessary to implement power converters • 3A Compound Main Gate Driver utilizing the Active Clamp / Reset technique. The • Programmable Line Under-Voltage Lockout device can be configured to control either a P- (UVLO) with Adjustable Hysteresis Channel clamp switch or an N-Channel clamp switch. With the active clamp technique, higher efficiencies • Voltage Mode Control with Feed-Forward and greater power densities can be realized • Adjustable Dual Mode Over-Current Protection compared to conventional catch winding or RDC • Programmable Overlap or Deadtime between clamp / reset techniques. Two control outputs are the Main and Active Clamp Outputs provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The active • Volt x Second Clamp clamp output can be configured for either a specified • Programmable Soft-start overlap time (for P-Channel switch applications) or a • Leading Edge Blanking specified deadtime (for N_Channel applications). The two internal compound gate drivers parallel both MOS • Single Resistor Programmable Oscillator and Bipolar devices, providing superior gate drive • Oscillator UP / DOWN Sync Capability characteristics. This controller is designed for high- • Precision 5V Reference speed operation including an oscillator frequency range up to 1MHz and total PWM and current sense • Thermal Shutdown propagation delays less than 100ns. The LM5025 includes a high-voltage start-up regulator that PACKAGES operates over a wide input range of 13V to 90V. • TSSOP-16 Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync • WSON-16 (5x5 mm) Thermally Enhanced capability, precision reference and thermal shutdown. Typical Application Circuit Figure 1. Simplified Active Clamp Forward Power Converter 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 © 2003–2013, 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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