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LM3464 数据表(PDF) 1 Page - Texas Instruments |
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LM3464 数据表(HTML) 1 Page - Texas Instruments |
1 / 33 page SYNC DR1 GD1 SE1 VDHC OutP VLedFB CDHC Faultb FAULT_CAP VCC DIM Thermal DMIN Thermal_Cap AGND PGND EN VIN PGND DR2 GD2 SE2 DR3 GD3 SE3 DR4 GD4 SE4 CFLT AGND AGND Primary power supply Voltage feedback pin VRAIL Voltage output Fault acknowledgement output FAULTb DIM PWM dimming input CDHC RFB1 RFB2 High Power LED Arrays Q1 Q2 Q3 Q4 RISNS1 RISNS2 RISNS3 RISNS4 RDHC RTHM1 CVCC RTHM2 CTHM RDMIN2 RDMIN1 PGND PGND PGND PGND PGND NTC thermistor couple to LED arrays To NTC thermal sensor A B To thermal sensor terminals A B External voltage headroom control VDHC 5V 0V LM3464/64A LM3464, LM3464A www.ti.com SNVS652F – APRIL 2010 – REVISED MAY 2013 LED Driver with Dynamic Headroom Control and Thermal Control Interfaces Check for Samples: LM3464, LM3464A 1 FEATURES DESCRIPTION The LM3464/64A is a 4-channel high voltage current 2 • Wide Input Voltage Range regulator that provides a simple solution for LED – 12V-80V (LM3464) lighting applications. The LM3464/64A provides four – 12V-95V (LM3464A) individual current regulator channels and works in conjunction with external N-channel MOSFETs and • Dynamic Headroom Control Ensures Maximum sense resistors to give accurate driving current for Efficiency every LED string. Additionally, the Dynamic • 4 Output Channels With Individual Current Headroom Control (DHC) output can be interfaced to Regulation the external power supply to adjust the LED supply • High Channel to Channel Accuracy voltage to the lowest level that is adequate to maintain all the string currents in regulation, yielding • Digital PWM/Analog Dimming Control Interface the optimal overall efficiency. • Resistor Programmable Dimming Frequency Digital PWM or analog voltage signals can be used to and Minimum Duty Cycle (Analog Dimming control the duty cycle of the all the channels. When Mode) analog control is used, the dimming frequency can be • Direct Interface to Thermal Sensor programmed via an external capacitor. A minimum • Fault Detection duty cycle control is provided in the conditions that the analog dimming is configured as thermal • Over Temperature Protection feedback. • Thermal Shutdown Protection features include VIN under-voltage lock- • Under Voltage Lockout out, LED open/short circuit and over-temperature fault • Thermal Enhanced TSSOP-28 Package signaling to the system controller. APPLICATIONS • Streetlights • Solid State Lighting Solutions Typical Application 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2010–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
类似零件编号 - LM3464 |
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类似说明 - LM3464 |
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