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LM2677T-ADJ Fiches technique(PDF) 4 Page - Texas Instruments |
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LM2677T-ADJ Fiches technique(HTML) 4 Page - Texas Instruments |
4 / 34 page LM2677 SNVS077I – MAY 2004 – REVISED JUNE 2012 www.ti.com LM2677-ADJ Electrical Characteristics Symbol Parameter Conditions Typ(1) Min(2) Max(2) Units VFB Feedback Voltage VIN = 8V to 40V, 100mA ≤ IOUT ≤ 5A 1.186 1.234 1.21 V VOUT Programmed for 5V 1.174 1.246 η Efficiency VIN = 12V, ILOAD = 5A 84 % (1) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. (2) All limits are specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are guaranteed via correlation using standard standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). All Output Voltage Versions Electrical Characteristics Limits appearing in bold type face apply over the entire junction temperature range of operation, −40°C to 125°C. Specifications appearing in normal type apply for TA = TJ = 25°C. Unless otherwise specified VIN=12V for the 3.3V, 5V and Adjustable versions and VIN=24V for the 12V version, Sync pin open circuited.. Symbol Parameter Conditions Typ Min Max Units DEVICE PARAMETERS IQ Quiescent Current VFEEDBACK = 8V For 3.3V, 5.0V, and ADJ Versions VFEEDBACK = 15V For 12V Versions 4.2 6 mA ISTBY Standby Quiescent ON/OFF Pin = 0V 100 50 μA Current 150 ICL Current Limit 6.1 8.3 7 A 5.75 8.75 IL Output Leakage VIN = 40V, ON/OFF Pin = 0V 200 1 μA Current VSWITCH = 0V 15 VSWITCH = −1V 6 mA RDS(ON) Switch On- ISWITCH = 5A 0.14 0.12 Ω Resistance 0.225 fO Oscillator Measured at Switch Pin 260 225 280 kHz Frequency D Duty Cycle Maximum Duty Cycle 91 % Minimum Duty Cycle 0 % IBIAS Feedback Bias VFEEDBACK = 1.3V 85 nA Current ADJ Version Only VON/OFF ON/OFF Threshold 1.4 0.8 2.0 V Voltage ION/OFF ON/OFF Input ON/OFF Input = 0V 20 45 μA Current FSYNC Synchronization VSYNC(Pin 5)=3.5V, 50% Duty Cycle 400 KHz Frequency VSYNC SYNC Threshold 1.4 V Voltage 4 Submit Documentation Feedback Copyright © 2004–2012, Texas Instruments Incorporated Product Folder Links: LM2677 |
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