Microchip Technology LED驅動(dòng)器
Atmel LED驅動(dòng)器是以系統為中心的混合信號LED驅動(dòng)器IC。它們服務(wù)于基礎廣泛和迅速發(fā)展的背光和固態(tài)照明市場(chǎng)，其應用包括LCD電視、PC監視器、專(zhuān)用面板（工業(yè)、軍事、醫療、航空電子設備等）以及普通照明。Atmel LED驅動(dòng)器結合了專(zhuān)有和專(zhuān)利模擬數字電路技術(shù)。此外，這些先進(jìn)的器件可以通過(guò)以系統為中心的方法為局部和全局調光、電源管理、信號調理和智能連接提供解決方案。藉此電子設備制造商可以顯著(zhù)增強產(chǎn)品特性，同時(shí)提高功率效率、可靠性和性?xún)r(jià)比。
The MSL204x adaptively control up to two DC-DC or off-line converters that power the LEDs using a proprietary efficiency optimizer. The efficiency optimizer minimizes power use while maintaining LED current accuracy. Multiple MSL204x can be cascaded to automatically negotiate the optimum power supply voltage when driving more than four strings from a single power supply.
The MSL204x LED Drivers feature fault control for open-circuit LED strings, LED short-circuits and device over-temperature conditions. When an open-circuit or short-circuit condition is detected, these devices turn off the faulty string and pull the open-drain fault output low.
The MSL204x operate independently with PWM LED dimming control from an applied signal, or are controlled by an external microcontroller or FPGA through the I2C serial interface. The serial interface allows optional control and monitoring of the various fault detection and efficiency optimizer parameters.
The Microchip Technology MSL204x LED Drivers are available in SOP32 and TQFN28 packages, and operate over the -40°C to +85°C temperature range.
特性
Drives four parallel high power LED strings
Up to 1A LED string current with external N-channel MOSFETS
Operates stand-alone, basic circuit needs only PWM input(s)
8-bit Adaptive SourcePower? correction optimizes string power supply for maximum efficiency
Multiple MSL204x can share a string supply and automatically negotiate the optimum supply voltage
±0.5% current matching between strings
String open-circuit and LED short-circuit fault detection and protection
External MOSFETs offer flexibility of LEDs used in each string
I2C serial interface allows optional control of device functions and faults
SOP32 and TQFN28 package options
-40°C to +85°C operating temperature range
Lead-free, Halogen-free, RoHS compliant package
應用
General and architectural lamps
Street lighting
Post-regulated or offline powered LED strings
High CRI LED fixtures
Down lights and recessed lights
LCD display backlighting
PAR lamps
