产品简介：
The XL1583 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function is built inside. When short protection function happens, the operation frequency will be reduced from 380KHz to 80KHz. An internal compensation BLOCK is built in to minimize external component count.
优势特点：
Wide 3.6V to 23V Input Voltage Range
Output Adjustable from 1.222V to 21V
Maximum Duty Cycle 100%
Minimum Drop Out 0.6V
Fixed 380KHz Switching Frequency
3A Constant Output Current Capability
Internal Optimize Power MOSFET
High efficiency
Excellent line and load regulation
TTL shutdown capability
EN pin with hysteresis function
Built in thermal shutdown function
Built in current limit function
Built in output short protection function
Available in SOP8L package
应用领域：
LCD Monitor and LCD TV
Digital Photo Frame
Set-up Box
ADSL Modem
Telecom / Networking Equipment
XL4012 大电流12A PWM DC/DC TO220输入3.6-25V 输出0.8V-23V转换效率高达95% (功能兼容)完全替代LM2677 LM2678 LM2679
XL4012 大电流 12A PWM *DC/DC
（一）输入3.6-25V ，输出0.8V-23V转换效率高达95%
(功能兼容)LM2677 LM2678 LM2679
XL4012 输入电压范围可由3.6伏特--30伏特,输出电压0.8V--23V可调整且输出电流可高达12A,非常适合于大尺寸液晶电视 电子 工业控制供电 智能安防 网络通讯等设备的电压转换.
XL4012应用电路非常简单,外围器件，其内部具有完整的系统保护 功能包括可调式软启动(adjustable soft-start)，短路保护(SCP)， 过温度保护(OTP)及可调式过电流保护(adjustable OCP)功能,切换频率固定为260KHz.XL4012采用标准的TO-220-5L无铅封装,可以兼容IC型号有:LTC3610 LTM4601
XL1507完全兼容Pin to PinAP1507
XL1509完全兼容Pin to PinAP1509
XL2576完全兼容Pin to PinLM2576 LM2575
XL2576P完全兼容Pin to PinGL2576P LM2575
XL2596完全兼容Pin to PinLM2596 AP1501 MIC4576 AP1506
是***型开关稳压器，具有非常小的电压调整率和电流调整率，能够输出3.3V 5V 12V 固定电压和可调节电压输出方式，在规定的输入电压和输出负载的条件下，XL系列产品输出电压的误差范围为±4％；振荡器的振荡频率误差范围为±10％；典型的待机电流为70μA 芯片内置过流保护电路和过热保护电路。
220V-50Hz 生活用电经*整流成4.5V~40V 直流电源为系统供电，经XL1507 XL1509 XL2576 XL2576P XL2596*得到稳定的电源，可根据不同应用改变R1 R2 的比例关系，从而使输出电压VOUT 可灵活变化 如R1=1K R2=3K 则输出电压为4.92V XL1507/XL1509/XL2576/XL2576P/XL2596 采用TO-252 TO220 和TO263封装，可PIN 对PIN 替换完全XL1507完全兼容Pin to PinAP1507
XL1509完全兼容Pin to PinAP1509
XL2576完全兼容Pin to PinLM2576 LM2575
XL2576P完全兼容Pin to PinGL2576P LM2575
XL2596完全兼容Pin to PinLM2596 AP1501 MIC4576 AP1506
优点：1、输入、输出电压范围宽；
（二）IC 内部CV，OVP 通过PWM 控制，输出电压，输出过压保护精度更高，响应速度更快，内置过流、过热保护，安全性更高；
（三）外围元件少，低纹波。输入25V 电压，输出12V 情况下，效率可达到90%。
其他几款同类型的芯片为：XL1509 XL2576 XL2576P XL2596