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LM3488 데이터시트(PDF) 4 Page - National Semiconductor (TI) |
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LM3488 데이터시트(HTML) 4 Page - National Semiconductor (TI) |
4 / 24 page Electrical Characteristics (Continued) Specifications in Standard type face are for T J = 25˚C, and in bold type face apply over the full Operating Temperature Range. Unless otherwise specified, V IN = 12V, RFA = 40k Ω Symbol Parameter Conditions Typical Limit Units V SC Short-Circuit Current Limit Sense Voltage V IN = 5V 325 235 395 mV mV (min) mV (max) V SL Internal Compensation Ramp Voltage V IN =5V 92 52 132 mV mV(min) mV(max) V OVP Output Over-voltage Protection (with respect to feedback voltage) (Note 8) V COMP = 1.4V 50 32/ 25 78/ 85 mV mV(min) mV(max) V OVP(HYS) Output Over-Voltage Protection Hysteresis(Note 8) V COMP = 1.4V 60 20 110 mV mV(min) mV(max) Gm Error Ampifier Transconductance V COMP = 1.4V I EAO = 100µA (Source/Sink) 800 600/ 365 1000/ 1265 µmho µmho (min) µmho (max) A VOL Error Amplifier Voltage Gain V COMP = 1.4V I EAO = 100µA (Source/Sink) 38 26 44 V/V V/V (min) V/V (max) I EAO Error Amplifier Output Current (Source/ Sink) Source, V COMP = 1.4V, V FB =0V 110 80/ 50 140/ 180 µA µA (min) µA (max) Sink, V COMP = 1.4V, VFB = 1.4V −140 −100/ −85 −180/ −185 µA µA (min) µA (max) V EAO Error Amplifier Output Voltage Swing Upper Limit V FB =0V COMP Pin = Floating 2.2 1.8 2.4 V V(min) V(max) Lower Limit V FB = 1.4V 0.56 0.2 1.0 V V(min) V(max) T SS Internal Soft-Start Delay V FB = 1.2V, VCOMP = Floating 4 msec T r Drive Pin Rise Time Cgs = 3000pf, V DR =0 to 3V 25 ns T f Drive Pin Fall Time Cgs = 3000pf, V DR =0 to 3V 25 ns VSD Shutdown and Synchronization signal threshold (Note 5) Output = High 1.27 1.35 V V (max) Output = Low 0.65 0.35 V V (min) I SD Shutdown Pin Current V SD =5V −1 µA V SD =0V +1 TSD Thermal Shutdown 165 ˚C T sh Thermal Shutdown Hysteresis 10 ˚C θ JA Thermal Resistance MM Package 200 ˚C/W www.national.com 4 |
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