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Diodes AL3158三路1x(2x)电荷泵白光LED驱动方案

文章出处:8gled.com作者:格烁光电发表时间:2018-07-23
福建代孕-备孕频道7QEm【承诺帮你成功】Diodes 公司的AL3158 是高效1x/2x电荷泵白光LED驱动器,DC/DC转换器采用双模式负载开关1x 或2x,VIN电压范围从2.7V到5.5V,最大电源效率高达93%,每路led电流20mA,路间电流匹配1%,内置了VOUT短路和LED短路保护功能,主要用在手机白光LED背光和指示器,PDA以及以电池为能源的电话主从屏幕白光LED背光.本文介绍了AL3158主要特性,功能方框图以及典型应用电路.

HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS

The AL3158 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1x), and (2x) conversion for white LED applications. The AL3158 is capable of driving three groups of three LED channELs at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple PWM dimming inputs individually or in parallel for driving highercurrent LEDs. Low external part counts (one 1μF flying capacitor and two 2.2μF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications.

AL3158 PWM dimming inputs are used to enable, disable device and dimming LED current with a fixed default current settings at 20mA or other factory programming options available.

Each output of the AL3158 is equippe兰州代孕-【助孕关切民生100%满意p5im】月子频道d with built-in protection for VOUT short circuit and auto-disable for LED short conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. A low-current shutdown feature disconnects the load from VIN to reduce quiescent current less than 1μA. The AL3158 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.

AL3158主要特性:

? VIN Range: 2.7V to 5.5V

? Up to 93% Max Power Efficiency

? 1% Current Matching Accuracy Between Channels

? Three simple PWM dimming for RGB or WLED

? Low transition threshold voltage typical 150 mV

? Dual-Mode 1x and 2x Charge Pump

? Drives up to 3 + 3 + 3 Channels of LEDs

? 1.2 MHz Constant Switching Frequency

? VOUT short circuit and Thermal Protections

? Soft Start for reducing inrush current

? Under Voltage Lockout Protection

? IQ <1μA in Shutdown

? Thermally-Enhanced QFN3030-20 Package: Available in “Green” Molding Compound (No Br, Sb)

? Lead Free Finish/ RoHS Compliant

AL3158应用:

? Mobile Phone White LED Backlighting and Indicators

? PDA White LED Backlighting

? Battery-operated Phone Main and Sub Screen White LED Backlighting


图1.AL3158功能方框图

图2.AL3158典型应用电路图

福建代孕-备孕频道7QEm【承诺帮你成功】 Diodes AL3158三路1x(2x)电荷泵白光LED驱动方案原创编辑请注明出来http://m.hzjjn.com

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