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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3649 датащи(PDF) 1 Page - ams AG |
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AS3649 датащи(HTML) 1 Page - ams AG |
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1 / 39 page  AS3649 2500mA High Current LED Flash Driver www.ams.com/AS3649 1.0-2 1 - 39 1 General Description The AS3649 is an inductive high efficient DCDC step up converter with two current sources. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sources can operate in flash / torch or video light modes. The AS3649 includes flash timeout, overvoltage, overtemperature, undervoltage and LED short/open circuit protection functions. A TXMASK/TORCH function reduces the flash current in case of parallel operation to the RF power amplifier and avoids a system shutdown. Alternatively this pin can be used to directly operate the torch light directly. If the TXMask function is not used, it can be used as a hardware torch input (programmable). A hardware NTC pin can be used to measure the LED temperature with the ADC and to automatically reduce the LED current if a temperature threshold is exceeded. The AS3649 is controlled by an I 2C interface and has a hardware reset pin ON. Setting ON=0 resets the AS3649. Interface input voltage levels are 1.8V compliant. The AS3649 is available in a space-saving WL-CSP package measuring only 2.06x2.02x0.6mm and operates over the -30ºC to +85ºC temperature range. Figure 1. Typical Operating Circuit 2 Key Features High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils - Stable even in coil current limit LED current adjustable up to 2x1000mA(2x1250mA with current boost) or 2000mA and automatic load balancing for two LEDs Automatic current adjustment for low battery voltage PWM operation for lower output current for reliable light output of the LED; can run at 31.5kHz to avoid audible noise Protection functions: Automatic Flash Timeout timer to protect the LED(s) Overvoltage and undervoltage Protection Overtemperature Protection LED short/open circuit protection ADC to measure LED temperature NTC to automatically reduce the flash current if the LED temperature is too high (programmable level) I 2C Interface with hardware reset pin Available in tiny WL-CSP Package, 16 balls 0.5mm pitch, 2.06x2.02x0.6mm package size 3 Applications Flash/Torch for mobile phones ! "! # $%&' %& ! %& "! ()* +*, ' -) # . - * ) ' /0 # ######## $$$ ########%$$$ ! AS3649 |
Аналогичный номер детали - AS3649 |
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Аналогичное описание - AS3649 |
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ссылки URL |
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