CXSB6602系列是高效率,同步整流,PWM，PWM/PFM可选的升/降压DC/DC控制器。仅使用基本的外围器件：三极管,电感,二极管,电容和电压检测电阻就可以实现一个通用的大电流输出,高效升/降压DC/DC转换器。该系列通过使用同步整流拓扑能达到高转换效率。CXSB6602系列可以在PWM控制和PWM/PFM自动切换控制之间通过PWM引脚外部切换。在PWM/PFM模式，CXSB6602在轻负载的时候可以从PWM自动切换到PFM，因而在整个负载范围里面都能达到高效率。在固定频率的PWM模式，可以很容易地降低输出噪声。CXSB6602系列有一个0.9V(±2.0%)内部参考电压，使用外接器件，输出电压就可以在2.0V～10.0V范围内自由设定。由于开关频率高达300kHz，可以使用小型的外围器件。软启动时间在内部设定为10ms，能够在打开电源的时候防止突入电流和过冲电压。The CXSB6602 series is highly efficient, synchronous PWM, PWM/PFM switchable step-up & down DC/DC controller ICs. A versatile, large output current and high efficiency, step-up/down DC/DC controller can be realized using only basic external components - transistors, coil, diode, capacitors, and resistors for detecting voltages. High efficiency is obtained through the use of a synchronous rectification topology. The operation of the CXSB6602 series can be switched between PWM and PWM/PFM (auto switching) externally using the PWM pin. In PWM/PFM mode, the CXSB6602 automatically switches from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of output loads conditions. Output noise can be easily reduced with PWM control since the frequency is fixed. Synchronous rectification control can be switched to non-synchronous by using external signals (MODE pin). High efficiency can be regulated at heavy loads when synchronous operation. The CXSB6602 has a 0.9V (±2.0%) internal voltage supply and using externally connected components, output voltage can be set freely between 2.0V to 6.0V. With an internal 300kHz switching frequency smaller external components can be used. Soft-start time is internally set to 10ms and offers protection against in-rush currents when the power is switched on and prevents voltage overshoot.DJb嘉泰姆
