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一,目录 1.产品概述 2.产品特点 3.应用范围 4.产品封装图 5.电路原理图 6.产品PCB 7.产品BOM 8.产品PDF文档 9.产品设计概述 二,产品概述(General Description) HM3111 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. HM3111 provides low-ripple power, high efficiency, an d excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter is build out soft start function that prevents overshoot and inrush current at startup. An over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. The operating frequency is decided by outside resistance. An external compensation is easily to system stable.With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP8-EP with exposed pad package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 40V, it is also suitable for the operation via an AC adapter. 三,.产品特点(Features) 1. Input voltage：4.2V to 40V 2.Output voltage：0.8V to 38V 3. Duty ratio：0% to 100% PWM control 4.Oscillation frequency range is 50K — 500KHz by outside resistance setting 5.Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection 6. Built-in internal SW P-channel MOS. 7. SOP8-EP Pb-Free package. 四,应用范围 (Applications) 五,产品封装图 (Package) 
六,电路原理图  七, 产品PCB  八.产品BOM
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