поискавой системы для электроныых деталей |
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LM2678SD-5.0 датащи(PDF) 4 Page - National Semiconductor (TI) |
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LM2678SD-5.0 датащи(HTML) 4 Page - National Semiconductor (TI) |
4 / 27 page 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. Specifica- tions appearing in normal type apply for T A =TJ = 25˚C. Unless otherwise specified VIN=12V for the 3.3V, 5V and Adjustable versions and V IN=24V for the 12V version. Symbol Parameter Conditions Typ Min Max Units DEVICE PARAMETERS I Q Quiescent Current V FEEDBACK = 8V 4.2 6 mA For 3.3V, 5.0V, and ADJ Versions V FEEDBACK = 15V For 12V Versions I STBY Standby Quiescent Current ON/OFF Pin = 0V 50 100/150 µA I CL Current Limit 7 6.1/5.75 8.3/8.75 A I L Output Leakage Current V IN = 40V, ON/OFF Pin = 0V V SWITCH =0V V SWITCH = −1V 16 200 15 µA mA R DS(ON) Switch On-Resistance I SWITCH = 5A 0.12 0.14/0.225 Ω f O Oscillator Frequency Measured at Switch Pin 260 225 280 kHz D Duty Cycle Maximum Duty Cycle 91 % Minimum Duty Cycle 0 % I BIAS Feedback Bias Current V FEEDBACK = 1.3V ADJ Version Only 85 nA V ON/OFF ON/OFF Threshold Voltage 1.4 0.8 2.0 V I ON/OFF ON/OFF Input Current ON/OFF Input = 0V 20 45 µA θ JA Thermal Resistance T Package, Junction to Ambient 65 (Note 5) θ JA T Package, Junction to Ambient 45 (Note 6) θ JC T Package, Junction to Case 2 θ JA S Package, Junction to Ambient 56 ˚C/W (Note 7) θ JA S Package, Junction to Ambient 35 (Note 8) θ JA S Package, Junction to Ambient 26 (Note 9) θ JC S Package, Junction to Case 2 ++ θ JA SD Package, Junction to Ambient 55 ˚C/W (Note 10) θ JA SD Package, Junction to Ambient 29 (Note 11) Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test condition, see the electrical Characteristics tables. Note 2: ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5 k Ω resistor into each pin. Note 3: Typical values are determined with TA =TJ = 25˚C and represent the most likely norm. www.national.com 4 |
Аналогичный номер детали - LM2678SD-5.0 |
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Аналогичное описание - LM2678SD-5.0 |
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