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LM5025BMTCX Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM5025BMTCX Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 16 page  LM5025B Active Clamp Voltage Mode PWM Controller General Description The LM5025B is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025B are as follows: • The maximum PWM duty cycle is limited to less than 75% to reduce voltage stress on the power MOSFETs. • The CS2 hiccup mode threshold is increased to 0.5V • The CS2 filter discharge device is disabled • The V CC regulator continues to operate when the line UVLO is below the threshold of normal operation • The V REF regulator is switched off when the line UVLO input falls below the operating threshold • The internal 5k Ω COMP pin pull-up resistor is removed The LM5025B PWM controller contains all of the features necessary to implement power converters utilizing the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and greater power densities can be real- ized compared to conventional catch winding or RDC clamp / reset 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 de- signed for high-speed operation including an oscillator fre- quency 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), soft- start, oscillator UP/DOWN sync capability, precision refer- ence and thermal shutdown. Features n Internal start-up bias regulator n 3A compound main gate driver n Programmable line under-voltage lockout (UVLO) with adjustable hysteresis n Voltage mode control with feed-forward n Adjustable dual mode over-current protection n Programmable overlap or deadtime between the main and active clamp outputs n Volt x Second maximum duty cycle clamp n Programmable soft-start n Current sense leading edge blanking n Single resistor programmable oscillator n Oscillator up / down sync capability n Precision 5V reference n Thermal shutdown Packages n TSSOP-16 n LLP-16 (5x5 mm) Thermally Enhanced Typical Application Circuit 20141101 Simplified Active Clamp Forward Power Converter March 2006 © 2006 National Semiconductor Corporation DS201411 www.national.com |
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