現在提供此產品的更新版本
功能與所比較的裝置相似
LM3421
- VIN Range From 4.5 V to 75 V
- High-Side Adjustable Current Sense
- 2-Ω, 1-A Peak MOSFET Gate Driver
- Input Undervoltage and Output Overvoltage Protection
- PWM and Analog Dimming
- Cycle-by-Cycle Current Limit
- Programmable Switching Frequency
- Zero Current Shutdown and Thermal Shutdown
- LED Output Status Flag (LM3423 and LM3423-Q0 Only)
- Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only)
The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421 and LM3423 devices use predictive off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.
The LM3421 and LM3423 devices include a high-voltage start-up regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM342x N -Channel Controllers for Constant-Current LED Drivers datasheet (Rev. G) | PDF | HTML | 2019年 7月 30日 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Technical article | Driving LEDs: topology matters | PDF | HTML | 2016年 2月 26日 | |
| Application note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013年 5月 3日 | ||
| EVM User's guide | LM3421 SEPIC LED Driver Evaluation Board for Automotive Applications (Rev. B) | 2013年 5月 3日 | ||
| EVM User's guide | AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A) | 2013年 5月 1日 | ||
| Application note | AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) | 2013年 4月 23日 |
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|---|---|---|
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