LM3464
- Wide Input Voltage Range
- 12V-80V (LM3464)
- 12V-95V (LM3464A)
- Dynamic Headroom Control Ensures Maximum Efficiency
- 4 Output Channels With Individual Current Regulation
- High Channel to Channel Accuracy
- Digital PWM/Analog Dimming Control Interface
- Resistor Programmable Dimming Frequency and Minimum Duty Cycle (Analog Dimming Mode)
- Direct Interface to Thermal Sensor
- Fault Detection
- Over Temperature Protection
- Thermal Shutdown
- Under Voltage Lockout
- Thermal Enhanced TSSOP-28 Package
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The LM3464/64A is a 4-channel high voltage current regulator that provides a simple solution for LED lighting applications. The LM3464/64A provides four individual current regulator channels and works in conjunction with external N-channel MOSFETs and sense resistors to give accurate driving current for every LED string. Additionally, the Dynamic Headroom Control (DHC) output can be interfaced to the external power supply to adjust the LED supply voltage to the lowest level that is adequate to maintain all the string currents in regulation, yielding the optimal overall efficiency.
Digital PWM or analog voltage signals can be used to control the duty cycle of the all the channels. When analog control is used, the dimming frequency can be programmed via an external capacitor. A minimum duty cycle control is provided in the conditions that the analog dimming is configured as thermal feedback.
Protection features include VIN under-voltage lock-out, LED open/short circuit and over-temperature fault signaling to the system controller.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM3464/4A LED Driver w/Dynamic Headroom Control & Thermal Control Interfaces datasheet (Rev. F) | 2013年 5月 1日 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 2020年 9月 21日 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Application note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013年 5月 3日 | ||
| Application note | AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) | 2013年 5月 1日 | ||
| User guide | AN-2071 LM3464A 4 Channel LED Driver Evaluation Board (Rev. C) | 2011年 6月 3日 |
設計與開發
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LM3464EVAL — 4 通道 LED 驅動器評估板
The LM3464 is a linear LED driver with Dynamic Headroom Control (DHC) technology designed to drive four serial high power / high brightness LED strings. Four individual linear current regulators with low-side N-channel MOSFETs realize regulations of LED currents. The DHC optimizes system efficiency (...)
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 引腳 | 下載 |
|---|---|---|
| HTSSOP (PWP) | 28 | 檢視選項 |
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