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A6271 A6271KLPTR-T APEK6271KLP-03-T 有现货 可添加我们联系方式获取最优惠价格
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A6271 is a new kind of DC - DC converter controller, it can provide a programmable constant current output, to drive the high power leds in series. The controller in programmable fixed frequency, the peak current mode control architecture based on. DC - DC converter can in a variety of different switch configuration Settings, including booster, lift pressure, and buck (ground reference switch).
A6271 using external logic level MOSFET and minimal external components provides a cost-effective solution. Use a separate external testing resistance can be set one of the largest LED current, and can use current reference input (analog control) precise adjustment. Through the PWMIN input to external PWM dimming, it also provides a shut off mode. As an alternative option, but through the PWMIN programming and DR pin, to use the PWM dimming circuit inside. Any kind of PWM scheme can control PWMOUT output, it can drive connected in series way LED twinkle light external p-channel MOSFET. The MOSFET can in some fault state (including the output of a short circuit) to isolation under load.
A6271 has been carefully designed to through distributed decoupling and externally programmable frequency jitter circuit (according to the request of "EMI standard CISPR 25 configuration) minimize electromagnetic radiation. Can also according to the requirements of most of the EMI standard, set the basic switching frequency below 150 kHz.
A6271 with comprehensive integrated protection function, can prevent IC, LED drive system, and therefore the LED string failure. Even when a programmable output overvoltage protection circuit in a single point of failure, fixed output overvoltage protection also can not exceed the maximum rated voltage value. Other protective features include: LED overload (boost), the output voltage (step-down or lifting pressure), input power (VIN) undervoltage, 5 V voltage regulator (VREG) output voltage, high side power supply PWM (PMOS) under-voltage and thermal protection.
application
For high power LED lighting system
Fog lamps, reversing light, daytime running lights (DRL), clearance lights and headlight.
评估套件
APEK6271KLP-01-T:降压 - 升压，x4LED (400mA)
APEK6271KLP-02-T:升压，x14LED (150mA)
APEK6271KLP-03-T:升压，x12LED (500mA)
Through the AEC - Q100 automotive electronic test standard certification
LED constant current drive
4.5 to 50 v supply voltage
LED twinkle light maximum voltage of 53.3 V
Booster, lift pressure and step-down switching converter
70 kHz to 700 kHz frequency programmable switch
PMOS transistor drive PWM control can be realized when working in low cycle accurate LED current control
Through external PWM, internal PWM dimming and/or analog dimming function
Frequency jitter scheme can effectively spread spectrum in order to reduce electromagnetic interference
Comprehensive fault protection and fault mark function
