Think electronics for portable applications launched series LED constant current drive

Beijing white LED Wang Electronic Technology Co., before the introduction of efficiency was 85% and the driver SE3506, suitable for mobile phone backlight, digital cameras, portable DVD and MPEG4 applications. SE3506 is a specially designed for constant current drive white LED boost DC/DC converter, you can use a lithium battery driven 2~6 series of LED. Specifically, 4 LED can be driven by a 3.0V power supply, or a 3.6V power supply drives up to 6 LED. The LED series connection method can provide the same current, so as to obtain uniform brightness without ballast resistors.

SE3506 switching frequency is 1MHz, allowing the use of small external components. Since the output capacitor with a value of only 1 F can be used, the cost and the cost are saved in comparison with other solutions. The low feedback voltage of the 95mV reduces the power consumption of the current regulating resistor, thereby improving the efficiency. EN pin can be used to control SE3506 or switch LED. In addition, the EN pin can be used to control the brightness of the LED without changing any components on the PCB. The frequency of different duty cycle can be sent to the EN pin to control the duration of the LED work. The longer the LED is opened, the longer it will turn off. SE3506 input voltage range of 2.0V~5.0V, covering the entire life of various types of lithium batteries, lithium batteries are generally just charging when the power is 4.2V, and before it was shut down to about 2.7V. The maximum output voltage of SE3506 to 35V, the slim inductor height of only 1mm.

SE3506 supply current is only 100mA, less than 10~20 times the same kind of LED driver, so the battery powered and low power consumption of portable applications provides energy savings. SE3506 has built-in thermal protection (OTP). When the temperature reaches 150 DEG C, the integrated circuit will enter the shutdown mode to ensure that the SE3506 and SE3506 products will not be damaged. In addition, the SE3506 built-in overcurrent protection (OCP), in case of short circuit or overload. In some cases, such as an accidental short circuit, overcurrent and overtemperature protection will work together to provide protection for integrated circuits and products.

SE9016 can be used in mobile phones with SE3506 (white LED driver) and SE5221 (dual channel LDO), to provide a common chipset solution for portable applications with lithium batteries and liquid crystal displays. SE3506 uses a 5 pin SOT23 package in the form of a purchase of $1000 per unit at a price of $2 per unit.