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LM5088 Datasheet(PDF) 5 Page - Texas Instruments |
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LM5088 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 36 page LM5088 www.ti.com SNVS600G – DECEMBER 2008 – REVISED MARCH 2011 Electrical Characteristics (1) (continued) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VVIN = 48V, VVCC= 8V, VEN = 5V RRT = 31.6 kΩ, No load on HG. Symbol Parameter Conditions Min Typ Max Units SOFT- START SS Pull-up Current Source VSS = 0V 8 11 13 µA FB to SS Offset VFB = 1.3V 150 mV ERROR AMPLIFIER VREF FB Reference Voltage Measured at FB Pin 1.187 1.205 1.223 V FB = COMP FB Input Bias Current VFB = 1.2V 18 100 nA COMP Sink/Source Current 3 mA AOL DC Gain 60 dB FBW Unity gain bandwidth 3 MHz PWM COMPARATORS THG(OFF) Forced HG Off-time 185 280 365 ns TON(MIN) Minimum HG On-time VVIN = 60V 55 ns COMP to PWM comparator offset 930 mV OSCILLATOR (RT Pin) LM5088-2 (Non-Dithering) Fnom1 Nominal Oscillator Frequency RRT = 31.6 kΩ 180 200 220 kHz Fnom2 RRT = 11.3 kΩ 430 500 565 kHz LM5088-1 (Dithering) Fmin Dithering Range Minimum Dither Frequency Fnom-5% kHz Fmax Maximum Dither Frequency Fnom+5% kHz SYNC SYNC positive threshold 2.3 V SYNC Pulse Width 15 150 ns CURRENT LIMIT VCS(TH) Cycle by cycle sense voltage threshold VRAMP = 0V 112 120 136 mV Cycle by Cycle Current Limit Delay VRAMP = 2.5V 280 ns Buck Switch VDS protection VIN to SW 1.5 V CURRENT LIMIT RESTART (RES Pin) Vresup RES Threshold Upper (rising) VCS = 0.125 1.1 1.2 1.3 V Vresdown RES Threshold Lower (falling) 0.1 0.2 0.3 V Icharge Charge source current VCS >= 0.125 40 50 65 µA Idischarge Discharge sink current VCS < 0.125 20 27 34 µA Irampdown Discharge sink current -(post fault) 0.8 1.2 1.6 µA RAMP GENERATOR(2) IRAMP1 RAMP Current 1 VVIN = 60V, VOUT = 10V 235 295 345 µA IRAMP2 RAMP Current 2 VVIN = 10V, VOUT = 10V 18 25 30 µA VOUT Bias Current VOUT = 48V 250 µA RAMP Output Low Voltage VVIN = 60V, VOUT = 10V 200 mV HIGH SIDE (HG) GATE DRIVER VOLH HG Low-state Output Voltage IHG = 100 mA 115 215 mV VOHH HG High-state Output Voltage IHG = -100 mA, VOHH = VBOOT - VHG 240 mV HG Rise Time Cload = 1000 pF 12 ns (2) RAMP and COMP are output pins. As such they are not specified to have an external voltage applied. Copyright © 2008–2011, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM5088 |
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