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LM3431 数据表(PDF) 4 Page - Texas Instruments |
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LM3431 数据表(HTML) 4 Page - Texas Instruments |
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4 / 36 page  LM3431 SNVS547F – NOVEMBER 2007 – REVISED MARCH 2009 www.ti.com PIN DESCRIPTIONS (continued) Pin No. Pin Name Description 21 NDRV3 Base drive for the channel 3 current regulator. Connect to the NPN base or NFET gate. 22 SNS2 Current feedback for channel 2. 23 NDRV2 Base drive for the channel 2 current regulator. 24 SNS1 Current feedback for channel 1. 25 NDRV1 Base drive for the channel 1 current regulator. 26 THM LED thermal monitor input pin. When pulled below 1.2V, device enters standby mode. 27 DIM PWM dimming input pin. Accepts a digital PWM or analog voltage level input to control LED current duty cycle. 28 EN Enable pin. Connect to VIN through a resistor divider to set an external UVLO threshold. Pull low to shutdown. EP Exposed pad. Connect to SGND. ABSOLUTE MAXIMUM RATINGS (1) If Military/Aerospace specified devices are required, contact the Texas Instruments Semiconductor Sales Office/ Distributors for availability and specifications. VALUE / UNIT VIN –0.3V to 37V EN –0.3V to 10V DIM –0.3V to 7V MODE/F –0.3V to 7V REFIN –0.3V to 7V THM –0.3V to 7V DLY –0.3V to 7V Voltages from the indicated pins to SGND: SNSx –0.3V to 7V NDRVx –0.3V to 7V CFB –0.3V to 7V SC -0.3V to 40V AFB –0.3V to 7V CS –0.3V to 7V VCC –0.3V to 7V Storage Temperature –65°C to +150°C Infrared 20sec, 240°C Soldering Dwell Time, Temperature Vapor Phase 75sec, 219°C ESD Rating Human Body Model(2) 2 kV (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the ELECTRICAL CHARACTERISTICS. (2) The human body model is a 100pF capacitor discharged through a 1.5 k Ω resistor into each pin. RECOMMENDED OPERATING CONDITIONS (1) VALUE / UNIT VIN 4.5V to 36V Junction Temperature Range -40°C to +125°C Thermal Resistance ( θJA) (2), TSSOP-28 (0.5W) 32°C/W Power Dissipation (3), TSSOP-28 3.1W (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the ELECTRICAL CHARACTERISTICS. (2) The Thermal Resistance specifications are based on a JEDEC standard 4-layer pcb. θJA will vary with board size and copper area. (3) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ_MAX, the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD_MAX = (TJ_MAX – TA)/θJA. The maximum power dissipation is determined using TA = 25°C, and TJ_MAX = 125°C. 4 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Links: LM3431 |
类似零件编号 - LM3431_14 |
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类似说明 - LM3431_14 |
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