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LM5020MMX-2 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM5020MMX-2 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 12 page Electrical Characteristics (Continued) Specifications in standard type face are for T J= +25˚C and those in boldface type apply over the full operating junction tem- perature range. Unless otherwise specified: V IN = 48V, VCC = 10V, and RT = 31.6K Ω Symbol Parameter Conditions Min Typ Max Units Oscillator Frequency1 (RT = 31.6k) (Note 5) 175 200 225 kHz Frequency2 (RT = 9.76k) (Note 5) 560 630 700 kHz Sync threshold 2.4 3.2 3.8 V PWM Comparator Delay to Output COMP set to 2V CS stepped 0 to 0.4V, Time to onset of OUT transition low 25 ns Min Duty Cycle COMP=0V 0 % Max Duty Cycle (-1 Device) 75 80 85 % Max Duty Cycle (-2 Device) 50 % COMP to PWM Comparator Gain 0.33 COMP Open Circuit Voltage 4.3 5.2 6.1 V COMP Short Circuit Current COMP=0V 0.6 1.1 1.5 mA Slope Compensation Slope Comp Amplitude (LM5020-1 Device Only) Delta increase at PWM Comparator to CS 80 105 130 mV Output Section Output High Saturation Iout = 50mA, V CC -VOUT 0.25 0.75 V Output Low Saturation I OUT = 100mA, VOUT 0.25 0.75 V Rise Time Cload = 1nF 18 ns Fall Time Cload = 1nF 15 ns Thermal Shutdown Tsd Thermal Shutdown Temp. 165 ˚C Thermal Shutdown Hysteresis 25 ˚C Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k Ω resistor. Note 3: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL). Note 4: Device thermal limitations may limit usable range. Note 5: Specification applies to the oscillator frequency. The operational frequency of the LM5020-2 devices is divided by two. www.national.com 5 |
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