lm5025-mdc National Semiconductor Corporation, lm5025-mdc Datasheet
lm5025-mdc
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lm5025-mdc Summary of contents
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... LM5025 Active Clamp Voltage Mode PWM Controller General Description The LM5025 PWM controller contains all of the features necessary to implement power converters utilizing the Active Clamp / Reset technique. The device can be configured to control either a P-Channel clamp switch or an N-Channel clamp switch. With the active clamp technique, higher effi- ...
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... Connection Diagram Ordering Information Order Number Package Type LM5025MTC TSSOP-16 LM5025MTCX TSSOP-16 LM5025SD LLP-16 LM5025SDX LLP-16 Pin Description PIN NAME 1 V Source Input Voltage IN 2 RAMP Modulator ramp signal 3 CS1 Current sense input for cycle-by-cycle limiting If CS1 exceeds 0.25V the outputs will go into ...
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Pin Description (Continued) PIN NAME 7 V Output from the internal high voltage start-up CC regulator. The V 7.6V. 8 OUT_A Main output driver 9 OUT_B Active Clamp output driver 10 PGND Power ground 11 AGND Analog ground 12 SS ...
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Block Diagram www.national.com Simplified Block Diagram 4 20086902 ...
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Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications GND GND CC CS1, CS2 to GND All other inputs to GND ESD Rating ...
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Electrical Characteristics Specifications with standard typeface are for T Temperature range 48V Symbol Parameter Soft-Start Soft-start Current Source Normal Soft-start Current Source following a CS2 event Oscillator Frequency1 Frequency2 Sync threshold Min Sync Pulse Width ...
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Electrical Characteristics Specifications with standard typeface are for T Temperature range 48V Symbol Parameter OUTPUT_B Fall Time Output Timing Control Overlap Time Deadtime Thermal Shutdown T Thermal Shutdown SD Threshold Thermal Shutdown Hysteresis Thermal Resistance ...
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Typical Performance Characteristics V Regulator Start-up Characteristics REF REF Overlap Time vs R www.national.com vs Vin CC 20086903 20086905 SET 20086907 20086904 Oscillator Frequency vs RT 20086906 Overlap Time ...
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Typical Performance Characteristics Dead Time vs R SET SS Pin Current vs Temperature (Continued) Dead Time vs Temperature 20086909 20086911 29.5K SET 20086910 www.national.com ...
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... A distinguishing feature of the LM5025 is the ability to accurately configure either dead time (both off) or overlap time (both on) of the gate driver outputs. The overlap / deadtime magnitude is con- is out of range ...
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... Clamp comparator, whichever event occurs first. Current Limit The LM5025 contains two modes of over-current protection. If the sense voltage at the CS1 input exceeds 0.25V the 20086913 present power cycle is terminated (cycle-by-cycle current limit) ...
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... kHz and RT in kΩ. The RT resistor should be located very close to the device and connected directly to the pins of the IC (RT and GND). A unique feature of LM5025 is the ability to synchronize the oscillator to an external clock with a frequency that is either higher or lower than the frequency of the internal oscillator. ...
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Soft-start The softstart feature allows the power converter to gradually reach the initial steady state operating point, thus reducing start-up stresses and surges. At power on, a 20µA current is sourced out of the softstart pin (SS) into an external ...
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www.national.com 14 ...
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Physical Dimensions inches (millimeters) unless otherwise noted Note recommended that the exposed pad be connected to Pin 11 (AGND) Molded TSSOP-16 NS Package Number MTC16 16-Lead LLP Surface Mount Package NS Package Number SDA16A 15 www.national.com ...
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... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...