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LM2841 数据表(PDF) 4 Page - Texas Instruments |
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LM2841 数据表(HTML) 4 Page - Texas Instruments |
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4 / 20 page  LM2841, LM2842 SNVS540H – MARCH 2009 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (continued) Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating Temperature Range ( TJ = −40°C to +125°C). Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = +25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 12V. Symbol Parameter Conditions Min (1) Typ (2) Max (1) Units tON(min) Minimum ON time See (6) 100 150 ns tOFF(min) Minimum OFF time X option 110 370 ns Y option 104 200 ns fSW LM2840/41/42X, VFB = 0.5V 325 550 750 kHz LM2840/41/42X, VFB = 0V 140 Switching frequency LM2840/41/42Y, VFB = 0.5V 0.95 1.25 1.50 MHz LM2840/41/42Y, VFB = 0V 0.35 DMAX Maximum duty cycle LM2840/41/42X 88 94 % LM2840/41/42Y 81 87 VUVP Undervoltage lockout On threshold 4.4 3.7 V thresholds Off threshold 3.5 3.25 V SHDN Shutdown threshold Device on 2.3 1.0 V Device off 0.9 0.3 ISHDN Shutdown pin input bias current VSHDN = 2.3V (5) 0.05 1.5 µA VSHDN = 0V 0.02 1.5 THERMAL SPECIFICATIONS RθJA Junction-to-Ambient Thermal See (7) 121 °C/W Resistance, SOT-6L Package RθJC Junction-to-Case Thermal 94 °C/W Resistance, SOT-6L Package (6) Minimum On Time specified by design and simulation. (7) All numbers apply for packages soldered directly onto a 3" x 3" PC board with 2 oz. copper on 4 layers in still air in accordance to JEDEC standards. Thermal resistance varies greatly with layout, copper thickness, number of layers in PCB, power distribution, number of thermal vias, board size, ambient temperature, and air flow. 4 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM2841 LM2842 |
类似零件编号 - LM2841_15 |
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类似说明 - LM2841_15 |
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