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LM3477MMX 데이터시트(PDF) 4 Page - Texas Instruments |
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LM3477MMX 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 35 page LM3477 SNVS141K – OCTOBER 2000 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (1) (continued) 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. Symbol Parameter Conditions Typical Limit Units ISUPPLY Supply Current (switching) (2) 2.0 mA 3.0 mA (max) IQ Quiescent Current in Shutdown Mode (3), V IN = 5V 5 µA 8 µA (max) VCL(O) Current Limit Voltage at 0% Duty Cycle LM3477 155 mV 130/125 mV (min) 185/190 mV (max) LM3477A 165 mV 140/135 mV (min) 195/200 mV (max) VCL(100) Current Limit Voltage at 100% Duty LM3477 74 mV Cycle 50/43 mV (min) 98/98 mV (max) LM3477A 65 mV 41/25 mV (min) 89/98 mV (max) VSC Short-Circuit Current Limit Sense VIN = 5V, LM3477 350 mV Voltage 270 mV (min) 420 mV (max) VIN = 5V, LM3477A 310 mV 260 mV (min) 380 mV (max) VSL Internal Compensation Ramp Voltage VIN = 5V, LM3477 83 mV Height VIN = 5V, LM3477A 103 VOVP Output Over-voltage Protection (with VCOMP = 1.4V 50 mV 32/25 respect to feedback voltage) (4) mV(min) 78/85 mV(max) VOVP(HYS) Output Over-Voltage Protection VCOMP = 1.4V 60 mV Hysteresis(4) 20 mV(min) 110 mV(max) Gm Error Amplifier Transconductance VCOMP = 1.4V 750 µmho IEAO = 100µA (Source/Sink) 600/365 µmho (min) 1000/1265 µmho (max) AVOL Error Amplifier Voltage Gain VCOMP = 1.4V 38 V/V IEAO = 100µA (Source/Sink) 30 V/V (min) 42 V/V (max) IEAO Error Amplifier Output Current (Source/ Source, VCOMP = 1.4V, VFB = 100 µA Sink) 0V 75/50 µA (min) 130/160 µA (max) Sink, VCOMP = 1.4V, VFB = 1.4V −140 µA −110/−95 µA (min) −170/−180 µA (max) VEAO Error Amplifier Output Voltage Swing Upper Limit 2.2 V VFB = 0V 2.0 V(min) COMP Pin = Floating 2.35 V(max) Lower Limit 0.75 V VFB = 1.4V 0.5 V(min) 0.95 V(max) TSS Internal Soft-Start Delay VFB = 1.2V, VCOMP = Floating 5 msec Tr Drive Pin Rise Time CGS = 3000pF, VDR = 0 to 3V 25 ns Tf Drive Pin Fall Time CGS = 3000pF, VDR = 0 to 3V 25 ns (2) For this test, the COMP/SD pin must be left floating. (3) For this test, the COMP/SD pin must be pulled low. (4) 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. 4 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3477 |
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