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LM3478MM Datasheet(PDF) 3 Page - Texas Instruments |
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LM3478MM Datasheet(HTML) 3 Page - Texas Instruments |
3 / 32 page LM3478 LM3478-Q1 www.ti.com SNVS085V – JULY 2000 – REVISED FEBRUARY 2013 Electrical Characteristics Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature Range. Unless otherwise specified, VIN = 12V, RFA = 40kΩ Symbol Parameter Conditions Typical Limit Unit VFB Feedback Voltage VCOMP = 1.4V, 1.26 V 2.97 ≤ VIN ≤ 40V 1.2416/1.228 V(min) 1.2843/1.292 V(max) ΔVLINE Feedback Voltage Line 2.97 ≤ VIN ≤ 40V 0.001 %/V Regulation ΔVLOAD Output Voltage Load IEAO Source/Sink ±0.5 %/A (max) Regulation VUVLO Input Undervoltage Lock-out 2.85 V 2.97 V(max) VUV(HYS) Input Undervoltage Lock-out 170 mV Hysteresis 130 mV (min) 210 mV (max) Fnom Nominal Switching Frequency RFA = 40KΩ 400 kHz 350 kHz(min) 440 kHz(max) RDS1 (ON) Driver Switch On Resistance IDR = 0.2A, VIN= 5V 16 Ω (top) RDS2 (ON) Driver Switch On Resistance IDR = 0.2A 4.5 Ω (bottom) VDR (max) Maximum Drive Voltage VIN < 7.2V VIN V Swing(1) VIN ≥ 7.2V 7.2 Dmax Maximum Duty Cycle(2) 100 % Tmin (on) Minimum On Time 325 nsec 210 nsec(min) 600 nsec(max) ISUPPLY Supply Current (non-switching) (3) 2.7 mA 3.3 mA (max) IQ Quiescent Current in VFA/SD = 5V (4), 5 µA Shutdown Mode VIN = 5V 10 µA (max) VSENSE Current Sense Threshold VIN = 5V 156 mV Voltage 135/ 125 mV (min) 180/ 190 mV (max) VSC Short-Circuit Current Limit VIN = 5V 343 250 mV Sense Voltage 415 mV (min) mV (max) VSL Internal Compensation Ramp VIN = 5V 92 mV Voltage 52 mV(min) 132 mV(max) VSL ratio VSL/VSENSE 0.49 0.30 (min) 0.70 (max) VOVP Output Over-voltage Protection VCOMP = 1.4V 50 mV (with respect to feedback 32/ 25 mV(min) voltage) (5) VSSOP Package 78/ 85 mV(max) SOIC Package 78/100 mV(max) VOVP(HYS) Output Over-Voltage VCOMP = 1.4V 60 mV Protection Hysteresis(5) 20 mV(min) 110 mV(max) (1) The voltage on the drive pin, VDR is equal to the input voltage when input voltage is less than 7.2V. VDR is equal to 7.2V when the input voltage is greater than or equal to 7.2V. (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/SD pin is pulled to ground using a 40K resistor. (4) For this test, the FA/SD pin is pulled to 5V 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 overvoltage protection threshold is given by adding the feedback voltage, VFB to the over-voltage protection specification. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3478 LM3478-Q1 |
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