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LM3488Q-Q1 数据表(PDF) 5 Page - Texas Instruments |
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LM3488Q-Q1 数据表(HTML) 5 Page - Texas Instruments |
5 / 37 page LM3488, LM3488-Q1 www.ti.com SNVS089N – JULY 2000 – REVISED DECEMBER 2014 Electrical Characteristics (continued) Unless otherwise specified, VIN = 12 V, RFA = 40 kΩ, TJ = 25°C PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Fnom Nominal Switching Frequency RFA = 40 KΩ 400 kHz RFA = 40 KΩ, −40°C ≤ TJ ≤ 125°C 360 430 RDS1 (ON) Driver Switch On Resistance (top) IDR = 0.2A, VIN= 5 V 16 Ω RDS2 (ON) Driver Switch On Resistance (bottom) IDR = 0.2A 4.5 Ω VDR (max) Maximum Drive Voltage Swing(1) VIN < 7.2 V VIN V VIN ≥ 7.2 V 7.2 Dmax Maximum Duty Cycle(2) 100% Tmin (on) Minimum On Time 325 nsec −40°C ≤ TJ ≤ 125°C 230 550 ISUPPLY Supply Current (switching) See (3) 2.7 mA See (3), −40°C ≤ TJ ≤ 125°C 3.0 IQ Quiescent Current in Shutdown Mode VFA/SYNC/SD = 5 V (4), V IN = 5 V 5 µA VFA/SYNC/SD = 5 V (4), V IN = 5 V, 7 −40°C ≤ TJ ≤ 125°C VSENSE Current Sense Threshold Voltage VIN = 5 V 135 156 180 mV VIN = 5 V, −40°C ≤ TJ ≤ 125°C 125 190 VSC Short-Circuit Current Limit Sense Voltage VIN = 5 V 343 mV VIN = 5 V, −40°C ≤ TJ ≤ 125°C 250 415 VSL Internal Compensation Ramp Voltage VIN = 5 V 92 mV VIN = 5 V, −40°C ≤ TJ ≤ 125°C 52 132 VSL ratio VSL/VSENSE 0.30 0.49 0.70 VOVP Output Overvoltage Protection (with VCOMP = 1.4 V 32 50 78 mV respect to feedback voltage) (5) VCOMP = 1.4 V, −40°C ≤ TJ ≤ 25 85 125°C VOVP(HYS) Output Over-Voltage Protection VCOMP = 1.4 V 60 mV Hysteresis(5) VCOMP = 1.4 V, −40°C ≤ TJ ≤ 20 110 125°C Gm Error Ampifier Transconductance VCOMP = 1.4 V, IEAO = 100 µA 600 800 1000 µmho (Source/Sink) VCOMP = 1.4 V, IEAO = 100 µA 365 1265 (Source/Sink), −40°C ≤ TJ ≤ 125°C AVOL Error Amplifier Voltage Gain VCOMP = 1.4 V, IEAO = 100 µA 38 V/V (Source/Sink) VCOMP = 1.4 V, IEAO = 100 µA 26 44 (Source/Sink), −40°C ≤ TJ ≤ 125°C IEAO Error Amplifier Output Current (Source/ Source, VCOMP = 1.4 V, VFB = 0 V 80 110 140 µA Sink) Source, VCOMP = 1.4 V, VFB = 0 V, 50 180 −40°C ≤ TJ ≤ 125°C Sink, VCOMP = 1.4 V, VFB = 1.4 V −100 −140 −180 µA Sink, VCOMP = 1.4 V, VFB = 1.4 V, −85 −185 −40°C ≤ TJ ≤ 125°C (1) The voltage on the drive pin, VDR is equal to the input voltage when input voltage is less than 7.2 V. VDR is equal to 7.2 V when the input voltage is greater than or equal to 7.2 V. (2) The limits for the maximum duty cycle can not be specified since the part does not permit less than 100% maximum duty cycle operation. (3) For this test, the FA/SYNC/SD Pin is pulled to ground using a 40K resistor . (4) For this test, the FA/SYNC/SD Pin is pulled to 5 V using a 40K resistor. (5) The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the feedback voltage. The over-voltage thresold can be calculated by adding the feedback voltage, VFB to the over-voltage protection specification. Copyright © 2000–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3488 LM3488-Q1 |
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类似说明 - LM3488Q-Q1 |
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