Analog Devices Inc. LT3922 2A同步升壓LED驅動器
Linear Technology/Analog Devices LT3922 2A Synchronous Step-Up LED Drivers are monolithic converters with a fixed-frequency, peak current control and PWM dimming for a string of LEDs. The LT3922 can operate in boost, buck or buck-boost modes. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. The LT3922 will maintain ±2% current regulation through an external sense resistor over a wide range of output voltages.
特點
- ±2% LED current regulation
- ±2% output voltage regulation
- 5000:1 PWM dimming at 100Hz
- 128:1 internal PWM dimming
- Spread spectrum frequency modulation
- Silent Switcher® architecture for low EMI
- Operates in Boost, Buck Mode, and Buck-Boost mode
- 2.8V to 36V input voltage range
- Up to 34V LED string voltage
- 2A, 40V internal switches
- 200kHz to 2MHz with SYNC function
- Analog or duty cycle LED current control
- Open/short LED protection and fault indication
- Thermally enhanced 28-lead (4mm × 5mm) QFN package
應用
- Automotive and industrial lighting
- Machine vision
Block Diagram
發佈日期: 2017-04-26
| 更新日期: 2022-03-11