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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM5039 bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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LM5039 bảng dữ liệu(HTML) 6 Page - Texas Instruments |
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6 / 33 page  LM5039 SNVS621D – FEBRUARY 2010 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Temperature range. VVIN = 48V, VVCC = 10V externally applied, RRT = 20.0 kΩ, RDLY = 27.4kΩ, VUVLO = 3V unless otherwise stated. See (1) and (2). Symbol Parameter Conditions Min Typ Max Units Under-voltage Standby Enable UVLO voltage rising 0.4 V Threshold Current Sense Input (CS Pin) VCS(th1) Current Limit Threshold for Peak 0.570 0.6 0.630 V cycle-by-cycle limiting VCS(th2) Current Limit Threshold for Average 0.475 0.5 0.525 V current limiting CS delay to output (peak cycle-by- CS from zero to 1V. Time for HO and LO to 65 ns cycle only) fall to 90% of VCC. Output load = 0 pF. Leading edge blanking time at CS 50 ns CS sink impedance (clocked) Internal FET on resistance 36 65 Ω Average Current (ACL Pin) IACL Pull-down sink Impedance 28 Ω Source Current VCS > 0.525 7.3 9.3 11.3 mA Current Limit Restart (RES Pin) VRES RES Threshold 2.4 2.5 2.6 V Charge source current VRES = 1.5V 16 22 28 µA Discharge sink current VRES = 1V 8 12 16 µA Soft-Start (SS Pin) ISS Charging current in normal operation VSS = 0 80 110 140 µA Charging current during a hiccup VSS = 0 0.6 1.2 1.8 µA mode restart Oscillator (RT Pin) FSW1 Frequency 1(at HO, half oscillator RRT = 25 kΩ 180 200 220 frequency) FSW2 Frequency 2 (at HO, half oscillator RRT = 8.76 kΩ 430 500 570 kHz frequency) FFoldback Foldback frequency in current limit RRT = 25 kΩ, 0.570<VCS > 0.525 66.7 kHz IACL>35 µA DC level 2 V Input Sync threshold 2.5 3 3.4 V PWM Controller (Comp Pin) Delay to output 110 ns VPWM-OS SS to RAMP offset 0.7 1 1.2 V Minimum duty cycle SS = 0V 0 % Small signal impedance ICOMP = 400µA, COMP current to PWM 6000 Ω voltage Main Output Drivers (HO and LO Pins) Output high voltage IOUT = 50mA, VHB - VHO, VVCC - VLO 0.5 0.25 V Output low voltage IOUT = 100 mA 0.2 0.5 V Rise time CLOAD = 1 nF 15 ns Fall time CLOAD = 1 nF 13 ns Peak source current VHO,LO = 0V, VVCC = 10V 1.25 A Peak sink current VHO,LO = 10V, VVCC = 10V 2 A HB Threshold VCC rising 3.8 V 6 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM5039 |
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