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LM5035 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM5035 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 28 page  Electrical Characteristics Specifications with standard typeface are for T J = 25˚C, and those with boldface type apply over full Operating Junction Temperature range.V VIN = 48V, VVCC = 10V externally applied, RRT = 15.0 k Ω, RDLY = 27.4k Ω,V UVLO = 3V, VOVP = 0V unless otherwise stated. See (Note 2) and (Note 3). (Continued) Symbol Parameter Conditions Min Typ Max Units Soft-Start (SS Pin) I SS Charging current in normal operation V SS =0 40 55 70 µA Charging current during a hiccup mode restart V SS =0 0.6 1.2 1.8 µA Soft-stop Current Sink V SS = 2.5V 40 55 70 µA Oscillator (RT Pin) F SW1 Frequency 1 (at HO, half oscillator frequency) R RT =15k Ω,T J = 25˚C 185 200 215 kHz R RT =15k Ω,T J = -40˚C to 125˚C 180 220 F SW2 Frequency 2 (at HO, half oscillator frequency) R RT = 5.49 k Ω 430 500 570 kHz DC level 2V Input Sync threshold 2.5 3 3.4 V PWM Controller (Comp Pin) Delay to output 80 ns V PWM-OS SS to RAMP offset 0.7 1 1.2 V Minimum duty cycle SS = 0V 0 % Small signal impedance I COMP = 600µA, COMP current to PWM voltage 5000 Ω Main Output Drivers (HO and LO Pins) Output high voltage I OUT = 50mA, VHB -VHO,VVCC -VLO 0.5 0.25 V Output low voltage I OUT = 100 mA 0.2 0.5 V Rise time C LOAD =1nF 15 ns Fall time C LOAD =1nF 13 ns Deadtime, HO to LO, LO to HO V DLY =VREF,ICOMP = 0mA 45 70 100 ns Peak source current V HO,LO = 0V, VVCC = 10V 1.25 A Peak sink current V HO,LO = 10V, VVCC = 10V 2 A Voltage Feed-Forward (RAMP Pin) RAMP comparator threshold COMP current = 0 2.4 2.5 2.6 V Synchronous Rectifier Drivers (SR1, SR2) Output high voltage I OUT = 10mA, VVCC -VSR1,VVCC -VSR2 0.25 0.1 V Output low voltage I OUT = 20 mA (sink) 0.08 0.2 V Rise time C LOAD =1nF 40 ns Fall time C LOAD =1nF 20 ns Peak source current V SR =0,VVCC = 10V 0.5 A Peak sink current V SR =VVCC,VVCC = 10V 0.5 A T1 Deadtime, SR1 falling to HO rising, SR2 falling to LO rising R DLY = 10k 40 ns R DLY = 27.4k 75 100 125 ns R DLY = 100k 300 ns T2 Deadtime, HO falling to SR1 rising, LO falling to SR2 rising R DLY = 10k 20 ns R DLY = 27.4k 30 45 65 ns R DLY = 100k 140 ns www.national.com 6 |
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