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LM25037 Folha de dados(PDF) 4 Page - Texas Instruments |
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LM25037 Folha de dados(HTML) 4 Page - Texas Instruments |
4 / 31 page LM25037, LM25037-Q1 SNVS572D – JULY 2008 – 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 of −40°C to + 125°C. VVIN = 12V, VVCC = 10V, RRT1 = 30.1 kΩ, RRT2 = 30.1 kΩ, VUVLO = 3V unless otherwise stated. (1)(2) Symbol Parameter Conditions Min Typ Max Units VREF(UV) Hysteresis 0.4 V Under-Voltage Lock Out and Shutdown (UVLO Pin) VUVLO Under-voltage threshold 1.20 1.25 1.295 V IUVLO Hysteresis current UVLO pin sinking 17 22 26 µA Under-voltage Shutdown Threshold UVLO voltage rising 0.35 0.45 0.6 V Hysteresis 0.1 V Current Sense Input (CS Pin) VCS Current Limit Threshold 0.22 0.255 0.29 V CS delay to output CS from zero to 1V. Time for OUTA and 27 ns OUTB to fall to 90% of VCC. Output load = 0 pF. Leading edge blanking time at CS 65 ns CS sink impedance (clocked) Internal FET sink impedance 21 45 Ω Current Limit Restart (RES Pin) VRES RES Threshold 1.9 2 2.2 V Charge source current VRES = 1.5V 14 18 21 µA Discharge sink current VRES = 1V 5 8 11 µA Soft-Start (SS Pin) ISS Charging current in normal VSS = 0 70 100 130 µA operation Charging current during a hiccup VSS = 0 0.6 1 1.4 µA mode restart Soft-Stop Current Sink VSS = 2.0V 70 100 130 µA Oscillator (RT1 and RT2 Pins) DT1 Dead-Time 1 RRT2 = 15 kΩ 40 75 105 ns DT2 Dead-Time 2 RRT2 = 50 kΩ 250 ns FSW1 Frequency 1 (at OUTA, half RRT1 = 30.1 kΩ, RRT2 = 30.1 kΩ, 178 200 222 kHz oscillator frequency) FSW2 Frequency 2 (at OUTA, half RRT1 = 11 kΩ, RRT2 = 30.1 kΩ, 448 515 578 kHz oscillator frequency) DC level 2 V Input Sync threshold 2.5 3 3.4 V PWM Controller (Comp Pin) Delay to output 65 ns VPWM-OS SS to RAMP offset 0.7 1 1.2 V Minimum duty cycle VSS = 0V 0 % COMP Open Circuit Voltage VFB = 0V 4.5 4.75 5.0 V COMP short circuit current VFB = 0V, COMP = 0V 0.5 1 1.5 mA Voltage Feed-Forward (RAMP Pin) RAMP sink impedance(Clocked) 5 20 Ω Error Amplifier GBW Gain Bandwidth 4 MHz DC Gain 75 dB Input Voltage VFB = COMP 1.22 1.245 1.27 V COMP sink capability VFB = 1.5V COMP=1V 5 13 mA FB Bias Current 10 nA Main Output Drivers (OUTA and OUTB Pins) 4 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM25037 LM25037-Q1 |
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