MicrosemiLX961022V12A电压模式同步控制器降压电源模块解决方案

Microsemi公司的LX9610是22V 12A降压电源模块,集成的电压模式同步控制器包罗赔偿网络,内部功率MOSFET和输出电感,输入电压8V-22V,用单个外接电阻,输出电压从0.8V到5V可调,主要用在机顶盒,服务器,工业设备,通信和数据通信设备,点负载稳压应用.本文先容了LX9610主要特点,框架图以及LX9610评估板电路图,质料清单和PCB设计原理图.

The LX9610 is a 22V, 12A Power Module designed for step down point of load applications. This device includes a voltage mode synchronous controller including the compensation network, internal power MOSFETs and the output inductor all in a 15mm x 15mm QFN package. It can operate with an input voltage from 8V to 22V. The output voltage is adjustable from 0.8V to 5V using a single external resistor. It has an internal 5V regulator.The only other components needed to make a complete 12A DC to DC converter are a 4.7uF decoupling capacitor for the 5V regulator, and the bulk input and output capacitors.

Other features of this device are internal digital soft start, thermal shutdown and hiccup mode current limit. The unit can be enabled or shut down through the COMP/EN pin. Over current sensing is accomplished by measuring the voltage across the Rds-on of the low-side MOSFET.

Current of the OCP pin of the IC multiplied by resistance of the OCP resistor (residing on the pcb inside the module) sets the OCP threshold. An external resistor can be used to reduce the OCP threshold.

The package of the power module contains five sections:

1) The controller that sits on a PCB, which contains the controller and the external resistorand caps that are needed for the controller to operate
2) The upper MOSFET placed in a cavity
3) The lower MOSFET placed in a cavity
4) The inductor placed between the output cavity and the lower MOSFET cavity
5) The PGND cavity
The LX9610 is package in a thermal enhanced, compact over-molded module with a length, width and height of the power module are 15mm x 15mm x 4mm. This package is suitable for assembly by standard automated surface mount equipment.

LX9610主要特点:

Fully integrated 12A Power Module Requiring Only Input/output Caps and Few External Components.
Operational Input Supply Voltage Range: 8V to 22V
Adjustable Output from 0.8V to 5V Using One External Resistor
Integrated Upper and Lower N-Ch MOSFET’s.
Preset 600Khz Switching Frequency (can go up to 1MHz)
Voltage Mode Control
Can be Enabled or Shut Down Through the COMP/EN pin
Internal Digital Soft Start
Cycle-by-cycle Over Current Monitoring with Hiccup mode protection
Available in QFN 15mm x 5mm x 4mm

LX9610应用:

Set-top box
Servers
Industrial Equipments
Telecom and Datacom Applications
Point of Load Regulator applications

图1.LX9610框架图

图2. LX9610评估板电路图

图3. LX9610评估板PCB顶层丝印图(1)

图4. LX9610评估板PCB设计原理图(2):层1

图5. LX9610评估板PCB设计原理图(3);层2

图6. LX9610评估板PCB设计原理图(4):层3

图7. LX9610评估板PCB设计原理图(5):底层4
LX9610评估板质料清单:

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http://www.microsemi.com/existing-parts/parts/179#docs-specs