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LM5576 Datasheet(PDF) 6 Page - Texas Instruments |
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LM5576 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 34 page LM5576, LM5576-Q1 SNVS447J – JANUARY 2007 – REVISED NOVEMBER 2014 www.ti.com Electrical Characteristics (continued) Typical values correspond to TJ = 25°C, VIN = 48 V, RT = 32.4kΩ. Minimum and maximum limits apply over –40°C to 125°C junction temperature range unless otherwise stated. (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Cycle by Cycle Current Limit (Q1) RAMP = 0 V 3.6 4.2 5.1 A Cycle by Cycle Current Limit Delay RAMP = 2.5 V 100 ns SOFT-START SS Current Source 7 10 14 µA OSCILLATOR Frequency1 180 200 220 kHz Frequency2 RT = 11kΩ 425 485 545 kHz SYNC Source Impedance 11 k Ω SYNC Sink Impedance 110 Ω SYNC Threshold (falling) 1.3 V SYNC Frequency RT = 11kΩ 550 kHz SYNC Pulse Width Minimum 15 ns RAMP GENERATOR Ramp Current 1 VIN = 60 V, VOUT=10 V 235 275 315 µA Ramp Current 2 VIN = 10 V, VOUT=10 V 18 25 32 µA PWM COMPARATOR Forced Off-time (Q0) 390 500 590 ns Forced Off-time (Q1) 416 500 575 ns Min On-time 80 ns COMP to PWM Comparator Offset 0.7 V ERROR AMPLIFIER Feedback Voltage (Q0) Vfb = COMP 1.207 1.225 1.243 V Feedback Voltage (Q1) Vfb = COMP 1.207 1.225 1.243 V FB Bias Current 17 nA DC Gain 70 dB COMP Sink / Source Current 3 mA Unity Gain Bandwidth 3 MHz DIODE SENSE RESISTANCE DSENSE 42 m Ω THERMAL SHUTDOWN Tsd Thermal Shutdown Threshold (Q0) 180 °C Tsd Thermal Shutdown Threshold (Q1) 165 °C Thermal Shutdown Hysteresis 25 °C 6 Submit Documentation Feedback Copyright © 2007–2014, Texas Instruments Incorporated Product Folder Links: LM5576 LM5576-Q1 |
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