CXSD6294两相PWM控制芯片为高级显卡和主板应用提供了一个精确的电压调节系统功率MOSFET驱动器与控制器

目录mDN嘉泰姆

1.产品概述                       2.产品特点mDN嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 mDN嘉泰姆
5.产品封装图                     6.电路原理图                   mDN嘉泰姆
7.功能概述                        8.相关产品mDN嘉泰姆

一,产品概述(General Description)   mDN嘉泰姆

      The CXSD6294, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic card and motherboard applications.mDN嘉泰姆
The integration of power MOSFET drivers into the controller IC and reducesmDN嘉泰姆
the number of external parts for a cost and space saving power management solution.mDN嘉泰姆
       The CXSD6294 uses a voltage-mode PWM architecture,operating withmDN嘉泰姆
adjust frequency from 100kHz to 800kHz.The device uses the voltage acrossmDN嘉泰姆
the DCRs of the inductors for current sensing achieves high efficiency. ThemDN嘉泰姆
device integrates adjustable load line voltage positioning (droop) and adopts low side RDS_ON for channel-cur-rent balance.mDN嘉泰姆
       The automatic phase reduction and over-current protection are accomplished through continuous inductor DCRs current sensing.The CXSD6294 also implement a one-bit VID control operation in which the feedback voltage is regulated andmDN嘉泰姆
tracks external input reference voltage.This controller protection features include over temperature(OTP), over-voltage(OVP), under-voltage(UVP) and over-current protections (OCP).The device also provides a power-on-reset function andmDN嘉泰姆
a programmable soft-start to prevent wrong operation and limit the input surge current during power-on or start-upmDN嘉泰姆
         The CXSD6294 is available in QFN4x4-24 packages.mDN嘉泰姆
二.产品特点(Features)mDN嘉泰姆

1.)Voltage-Mode Operation with Current SharingmDN嘉泰姆
2.)Operate with 4.5V~13.2V Supply VoltagemDN嘉泰姆
3.)Support Single and Two-Phase OperationsmDN嘉泰姆
4.)+2% Reference Voltage Accuracy Over TemperaturemDN嘉泰姆
5.)Loss-Less Inductor DCR Current SensingmDN嘉泰姆
6.)Adjustable Over Current Protection use DCR Current SensingmDN嘉泰姆
7.)Programmable PWM Switching Frequency from 100kHz to 800kHzmDN嘉泰姆
8.)Dynamic Output Voltage Adjustment Adjustable Soft-startmDN嘉泰姆
     QFN4x4-24 PackagemDN嘉泰姆
9.)Halogen and Lead Free Available (RoHS Compliant)
三,应用范围 (Applications)mDN嘉泰姆

   VGAmDN嘉泰姆
   Mother BoardmDN嘉泰姆
四.下载产品资料PDF文档 mDN嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！mDN嘉泰姆

 mDN嘉泰姆

五, 产品封装图 (Package)mDN嘉泰姆

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六.电路原理图mDN嘉泰姆

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七,功能概述mDN嘉泰姆

Offset Current AdjustmDN嘉泰姆
The CXSD6294 integrated IOFS allows the offset current to adjust phase current. The IOFS pin voltage is nominalmDN嘉泰姆
0.5V when connecting a resistor to GND and 1.5V when connecting a resistor to VREF. Connecting a resistor frommDN嘉泰姆
IOFS pin to GND generate a current source as:IOFS= 0.5V/RIOFSmDN嘉泰姆
This current is add to phase 1 current signal ISEN1 for cur-rent balance. Consequently, phase 2 will share moremDN嘉泰姆
percentage of output current. Connecting a resistor frommDN嘉泰姆
IOFS pin to VREF generates a current source as:mDN嘉泰姆
IOFS= (2V-1.5V) /RIOFSmDN嘉泰姆
This current is add to phase 2 current signal ISEN2 for cur-rent balance. Consequently, phase 1 will share moremDN嘉泰姆
percentage of output current. mDN嘉泰姆
 Over-Temperature Protection (OTP)mDN嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD6294. When the junction temperature mDN嘉泰姆

exo ceeds 150 C, a thermal sensor pulls UGTAEx and LGATEx low, allowing the devices to cool. The thermal mDN嘉泰姆

sensor allows the converters to start a soft-start process and regulates the output voltage again after the mDN嘉泰姆

junction temo  perature cools by 20 C. The OTP is designed with a 20 C hysteresis to lower the averagemDN嘉泰姆

 Junction Temperature (TJ) during continuous thermal overload conditions increasing the lifetime of the device. mDN嘉泰姆
OVPmDN嘉泰姆
The over-voltage protection (OVP) circuit monitors the FB (VFB) voltage to prevent the output from over-voltage.mDN嘉泰姆

When the V FB rises to 130% of the EAP voltage (V EAP), the JTMA 8700 turns off high-side and turn on low-sidemDN嘉泰姆
MOSFETs to sink output voltage (VOUT). As soon as the VFB falls below 110% of V EAP, the OVP comparator ismDN嘉泰姆
disengaged. The chip will restore its normal operation.mDN嘉泰姆
UVPmDN嘉泰姆
The under-voltage protection circuit monitors the voltage on FB (VFB) by Under-Voltage (UV) comparator tomDN嘉泰姆

 protect the PWM converter against short-circuit conditions. When the VFB falls below the falling UVP threshold mDN嘉泰姆

(50% VEAP), a fault signal is generated and the device turns off highside and low-side MOSFETs. The converter mDN嘉泰姆

shuts down and the output is latched to be floating. The CXSD6294 will initials a soft-start process until re-cyclemDN嘉泰姆

 RT/EN or VCCmDN嘉泰姆
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