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LM5021MM-1 Datasheet(PDF) 4 Page - Texas Instruments |
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LM5021MM-1 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 23 page  LM5021 SNVS359D – MAY 2005 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (1) (continued) Specifications in standard type face are for TJ= +25°C and those in boldface type apply over the full Operating Junction Temperature Range. Unless otherwise specified: VIN = 15V, RT = 44.2KΩ. Symbol Parameter Conditions Min Typ Max Unit SOFT-START VSS-OCV SS pin open-circuit voltage 4.3 5.2 6.1 V Soft-start Current Source 15 22 30 µA Soft-start to COMP Offset 0.35 0.55 0.75 V COMP sinking impedance During SS ramp 60 Ω OSCILLATOR Frequency1 (RT = 44.2K) 135 150 165 kHz Frequency2 (RT = 13.3K) 440 500 560 kHz Sync threshold 2.4 3.2 3.8 V PWM COMPARATOR COMP to OUT delay COMP set to 2V 20 ns CS stepped 0 to 0.4V, time to OUT transition low, Cload = 0. 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 4.2 5.1 6 V COMP at Max Duty Cycle 2.75 V COMP Short Circuit Current COMP = 0V 0.6 1.1 1.5 mA SLOPE COMPENSATION Slope Comp Amplitude (LM5021-1 CS pin to PWM 70 90 110 mV only) Comparator offset at maximum duty cycle OUTPUT SECTION OUT High Saturation IOUT = 50mA, VCC - 0.6 1.1 V OUT OUT Low Saturation IOUT = 100mA 0.3 1 V Peak Source Current OUT = VCC/2. 0.3 A Peak Sink Current OUT = VCC/2. 0.7 A Rise time Cload = 1nF 25 ns Fall time Cload = 1nF 10 ns HICCUP MODE VOVLD Over load detection threshold COMP pin VSS-OCV – 0.8 VSS-OCV – 0.6 VSS-OCV– 0.4 V VHIC Hiccup mode threshold SS pin VSS-OCV – 0.8 VSS-OCV – 0.6 VSS-OCV– 0.4 V VRST Hiccup mode Restart threshold SS pin 0.1 0.3 0.5 V IDTCS Dead-time current source 0.1 0.25 0.4 µA IOVCS Overload detection timer current 6 10 14 µA source THERMAL RESISTANCE θJA VSSOP-8 Junction to Ambient 0 LFM 200 °C/W θJA PDIP-8 Junction to Ambient 0 LFM 107 °C/W 4 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM5021 |
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