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LM5072MH-50 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM5072MH-50 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 24 page Electrical Characteristics (Note 4) Specifications in standard type face are for T J = +25˚C and those in boldface type apply over the full operating junction temperature range. Unless otherwise specified: V IN = 48V, FOSC = 250kHz. (Continued) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Auxiliary Power Option ICL_FAUX Threshold ICL_FAUX Pin Rising 8.1 8.7 9.3 V ICL_FAUX Pull Down Current 50 µA RAUX Lower Threshold (I = 22 µA) RAUX Pin Rising 2.3 2.5 3.0 V RAUX Upper Threshold (I = 250 µA) RAUX Pin Falling 5.4 6.0 6.9 V RAUX Lower Threshold Hysteresis 0.8 V RAUX Lower Threshold Current 16 22 28 µA RAUX Upper Threshold Current 187 250 313 µA VCC Regulator VccReg VCC Regulation (VccReg) 7.4 7.7 8 V VCC Current Limit 15 mA VCC UVLO (Rising) VccReg – 210 mV VccReg – 100 mV V VCC UVLO (Falling) 5.9 6.2 6.5 V VIN Supply Current V CC = 10V 2.0 mA Supply Current (Icc) V CC = 10V 3 mA VCC Regulator Dropout V IN –VCC (Note 6) 6.5 V Error Amplifier Gain Bandwidth 3 MHz DC Gain 67 dB Input Voltage 1.225 1.275 V COMP Sink Capability 5 10 mA Current Limit ILIM Delay to Output 30 ns Cycle by Cycle Current Limit Threshold Voltage 0.45 0.5 0.55 V Leading Edge Blanking Time 65 ns CS Sink Impedance (clocked) 35 55 Ω Soft-start Soft-start Current Source 8 10 12 µA Oscillator Frequency1 (R T = 26.1 k Ω) 175 200 225 KHz Frequency2 (R T = 8.7 k Ω) 515 580 645 KHz Sync threshold 2.6 3.2 3.8 V PWM Comparator Delay to Output 25 ns Min Duty Cycle 0 % Max Duty Cycle (-80 Device) 75 80 85 % Max Duty Cycle (-50 Device) 47 50 53 % COMP to PWM Comparator Gain 0.33 COMP Open Circuit Voltage 4.3 5.2 6.1 V COMP Short Circuit Current 0.6 1.0 1.4 mA Slope Compensation (LM5072-80 Device Only) Slope Comp Amplitude 70 90 110 mV Output Section Output High Saturation 0.25 0.75 V www.national.com 5 |
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