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LM2678SD-ADJ Arkusz danych(PDF) 6 Page - Texas Instruments |
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LM2678SD-ADJ Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 36 page 6 LM2678 SNVS029J – MARCH 2000 – REVISED JULY 2016 www.ti.com Product Folder Links: LM2678 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated (1) All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are specified through correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (2) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. 6.7 Electrical Characteristics – 12 V Specifications apply for TA = TJ = 25°C and RADJ = 5.6 kΩ (unless otherwise noted). PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT VOUT Output voltage VIN = 15 V to 40 V, 100 mA ≤ IOUT ≤ 5 A TJ = 25°C 11.76 12 12.24 V TJ = –40°C to 125°C 11.64 12.36 η Efficiency VIN = 24 V, ILOAD = 5 A 92% (1) All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are specified through correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (2) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. 6.8 Electrical Characteristics – Adjustable Specifications apply for TA = TJ = 25°C and RADJ = 5.6 kΩ (unless otherwise noted). PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT VFB Feedback voltage VIN = 8 V to 40 V, 100 mA ≤ IOUT ≤ 5 A VOUT programmed for 5 V TJ = 25°C 1.186 1.21 1.234 V TJ = –40°C to 125°C 1.174 1.246 η Efficiency VIN = 12 V, ILOAD = 5 A 84% (1) The peak switch current limit is determined by the following relationship: ICL = 37,125 / RADJ 6.9 Electrical Characteristics – All Output Voltage Versions Specifications are for TA = TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and adjustable versions, and VIN = 24 V for the 12-V version (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT IQ Quiescent current VFEEDBACK = 8 V for 3.3-V, 5-V, and adjustable versions, VFEEDBACK = 15 V for 12-V version 4.2 6 mA ISTBY Standby quiescent current ON/OFF pin = 0 V TJ = 25°C 50 100 µA TJ = –40°C to 125°C 150 ICL Current limit RADJ = 5.6 kΩ (1) TJ = 25°C 5.5 6.3 7.6 A TJ = –40°C to 125°C 5.3 8.1 IL Output leakage current VIN = 40 V, soft-start pin = 0 V VSWITCH = 0 V 1 1.5 mA VSWITCH = –1 V 6 15 RDS(ON) Switch ON-Resistance ISWITCH = 5 A TJ = 25°C 0.12 0.14 Ω TJ = –40°C to 125°C 0.225 fO Oscillator frequency Measured at switch pin TJ = 25°C 260 kHz TJ = –40°C to 125°C 225 280 D Duty cycle Maximum duty cycle 91% Minimum duty cycle 0% IBIAS Feedback bias current VFEEDBACK = 1.3 V (adjustable version only) 85 nA VON/OFF ON/OFF threshold voltage TJ = 25°C 1.4 V TJ = –40°C to 125°C 0.8 2 ION/OFF ON/OFF input current ON/OFF input = 0 V TJ = 25°C 20 μA TJ = –40°C to 125°C 45 |
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