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RJ4嘉泰姆

1.产品概述                       2.产品特点RJ4嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 RJ4嘉泰姆
5.产品封装图                     6.电路原理图                   RJ4嘉泰姆
7.功能概述                        8.相关产品RJ4嘉泰姆

一,产品概述(General Description)   RJ4嘉泰姆

      The CXSD6294, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic card and motherboard applications.RJ4嘉泰姆
The integration of power MOSFET drivers into the controller IC and reducesRJ4嘉泰姆
the number of external parts for a cost and space saving power management solution.RJ4嘉泰姆
       The CXSD6294 uses a voltage-mode PWM architecture,operating withRJ4嘉泰姆
adjust frequency from 100kHz to 800kHz.The device uses the voltage acrossRJ4嘉泰姆
the DCRs of the inductors for current sensing achieves high efficiency. TheRJ4嘉泰姆
device integrates adjustable load line voltage positioning (droop) and adopts low side RDS_ON for channel-cur-rent balance.RJ4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 andRJ4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 andRJ4嘉泰姆
a programmable soft-start to prevent wrong operation and limit the input surge current during power-on or start-upRJ4嘉泰姆
         The CXSD6294 is available in QFN4x4-24 packages.RJ4嘉泰姆
二.产品特点(Features)RJ4嘉泰姆

1.)Voltage-Mode Operation with Current SharingRJ4嘉泰姆
2.)Operate with 4.5V~13.2V Supply VoltageRJ4嘉泰姆
3.)Support Single and Two-Phase OperationsRJ4嘉泰姆
4.)+2% Reference Voltage Accuracy Over TemperatureRJ4嘉泰姆
5.)Loss-Less Inductor DCR Current SensingRJ4嘉泰姆
6.)Adjustable Over Current Protection use DCR Current SensingRJ4嘉泰姆
7.)Programmable PWM Switching Frequency from 100kHz to 800kHzRJ4嘉泰姆
8.)Dynamic Output Voltage Adjustment Adjustable Soft-startRJ4嘉泰姆
     QFN4x4-24 PackageRJ4嘉泰姆
9.)Halogen and Lead Free Available (RoHS Compliant)
三,应用范围 (Applications)RJ4嘉泰姆

   VGARJ4嘉泰姆
   Mother BoardRJ4嘉泰姆
四.下载产品资料PDF文档 RJ4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！RJ4嘉泰姆

 RJ4嘉泰姆

五, 产品封装图 (Package)RJ4嘉泰姆

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六.电路原理图RJ4嘉泰姆

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七,功能概述RJ4嘉泰姆

Offset Current AdjustRJ4嘉泰姆
The CXSD6294 integrated IOFS allows the offset current to adjust phase current. The IOFS pin voltage is nominalRJ4嘉泰姆
0.5V when connecting a resistor to GND and 1.5V when connecting a resistor to VREF. Connecting a resistor fromRJ4嘉泰姆
IOFS pin to GND generate a current source as:IOFS= 0.5V/RIOFSRJ4嘉泰姆
This current is add to phase 1 current signal ISEN1 for cur-rent balance. Consequently, phase 2 will share moreRJ4嘉泰姆
percentage of output current. Connecting a resistor fromRJ4嘉泰姆
IOFS pin to VREF generates a current source as:RJ4嘉泰姆
IOFS= (2V-1.5V) /RIOFSRJ4嘉泰姆
This current is add to phase 2 current signal ISEN2 for cur-rent balance. Consequently, phase 1 will share moreRJ4嘉泰姆
percentage of output current. RJ4嘉泰姆
 Over-Temperature Protection (OTP)RJ4嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD6294. When the junction temperature RJ4嘉泰姆

exo ceeds 150 C, a thermal sensor pulls UGTAEx and LGATEx low, allowing the devices to cool. The thermal RJ4嘉泰姆

sensor allows the converters to start a soft-start process and regulates the output voltage again after the RJ4嘉泰姆

junction temo  perature cools by 20 C. The OTP is designed with a 20 C hysteresis to lower the averageRJ4嘉泰姆

 Junction Temperature (TJ) during continuous thermal overload conditions increasing the lifetime of the device. RJ4嘉泰姆
OVPRJ4嘉泰姆
The over-voltage protection (OVP) circuit monitors the FB (VFB) voltage to prevent the output from over-voltage.RJ4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-sideRJ4嘉泰姆
MOSFETs to sink output voltage (VOUT). As soon as the VFB falls below 110% of V EAP, the OVP comparator isRJ4嘉泰姆
disengaged. The chip will restore its normal operation.RJ4嘉泰姆
UVPRJ4嘉泰姆
The under-voltage protection circuit monitors the voltage on FB (VFB) by Under-Voltage (UV) comparator toRJ4嘉泰姆

 protect the PWM converter against short-circuit conditions. When the VFB falls below the falling UVP threshold RJ4嘉泰姆

(50% VEAP), a fault signal is generated and the device turns off highside and low-side MOSFETs. The converter RJ4嘉泰姆

shuts down and the output is latched to be floating. The CXSD6294 will initials a soft-start process until re-cycleRJ4嘉泰姆

 RT/EN or VCCRJ4嘉泰姆
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