CXSD6279B

CXSD6279B提供输出负载变化的良好调节。内部0.8V温度-补偿参考电压的设计满足
低输出电压应用。它包括一个200kHz的自由运行三角波振荡器,可从70kHz调整到800kHz。上电复位(POR)电路监控VCC、EN和OCSET启动或关闭集成电路的输入电压。过电流保护(OCP)使用上部的电压降监测输出电流MOSFET的RDS(开),消除了对电流传感电阻的需要。欠压保护(UVP)监测FB引脚的电压短路保护

CXSD6279B电压模式和同步PWM控制器驱动双N通道mosfet控制监视和保护功能受控电源带欠压和过流保护的输出

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产品简介

目录RMp嘉泰姆

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

一,产品概述(General Description)      RMp嘉泰姆


                The CXSD6279B is a voltage mode and synchronous PWM controllerRMp嘉泰姆
which drives dual N-Channel MOSFETs. It inte-grates the control, monitoring,RMp嘉泰姆
and protection functions into a single package, provides one controlled powerRMp嘉泰姆
outputs with under-voltage and over-current protection.CXSD6279B providesRMp嘉泰姆
excellent regulation for output load variation. An internal 0.8V temperature-RMp嘉泰姆
compensated reference voltage is designed to meet the requirement ofRMp嘉泰姆
low output voltage applications. It includes a 200kHz free-runningRMp嘉泰姆
triangle-wave oscillator that is adjustable from 70kHz to 800kHz.RMp嘉泰姆
        The power-on-reset (POR) circuit monitors the VCC, EN,and OCSETRMp嘉泰姆
input voltage to start-up or shutdown the IC.The over-current protection (OCP)RMp嘉泰姆
monitors the output current by using the voltage drop across the upperRMp嘉泰姆
MOSFET’s RDS(ON), eliminating the need for a current sens-ing resistor.RMp嘉泰姆
The under-voltage protection (UVP) moni-tors the voltage of the FB pin forRMp嘉泰姆
short-circuit protection.The over-current protection trip cycle the soft-startRMp嘉泰姆
func-tion until the fault events be removed. Under-voltage pro-tection willRMp嘉泰姆
shutdown the IC directly.RMp嘉泰姆
二.产品特点(Features)RMp嘉泰姆


1.)Simple Single-Loop Control DesignRMp嘉泰姆
   Voltage-Mode PWM ControlRMp嘉泰姆
2.)Fast Transient ResponseRMp嘉泰姆
    Full 0–100% Duty RatioRMp嘉泰姆
3.)Excellent Output Voltage RegulationRMp嘉泰姆
   0.8V Internal ReferenceRMp嘉泰姆
    ± 1% Over Line Voltage and TemperatureRMp嘉泰姆
4.)Over Current Fault MonitorRMp嘉泰姆
   Uses Upper MOSFETs RDS (ON)RMp嘉泰姆
5.)Converter Can Source and Sink CurrentRMp嘉泰姆
6.)Small Converter SizeRMp嘉泰姆
    200kHz Free-Running OscillatorRMp嘉泰姆
   Programmable from 70kHz to 800kHzRMp嘉泰姆
7.)14-Lead SOIC PackageRMp嘉泰姆
8.)Lead Free and Green Devices Available (RoHS Compliant)RMp嘉泰姆
三,应用范围 (Applications)RMp嘉泰姆


Graphic CardsRMp嘉泰姆
DDR Memory Power SupplyRMp嘉泰姆
DDR Memory Termination VoltageRMp嘉泰姆
Low-Voltage Distributed Power SuppliesRMp嘉泰姆
四.下载产品资料PDF文档 RMp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RMp嘉泰姆

 QQ截图20160419174301.jpgRMp嘉泰姆

五,产品封装图 (Package)RMp嘉泰姆


RMp嘉泰姆
RT (Pin1)RMp嘉泰姆
This pin can adjust the switching frequency. Connect a resistor from the RT to the GND for increasing the switch-RMp嘉泰姆
OCSET (Pin2)RMp嘉泰姆
This pin serves two functions: a shutdown control and the setting of over current-limit threshold. Pulling this pinRMp嘉泰姆
below 1.27V will shutdown the controller, forcing the UGATE and LGATE signals to be at 0V.RMp嘉泰姆
A resistor (Rocset) connected between this pin and the drain of the high side MOSFET will determine the over RMp嘉泰姆

current limit. An internal 200μA current source will flow through this resistor, creating a voltage drop, which RMp嘉泰姆

will be com-pared with the voltage across the high side MOSFET.RMp嘉泰姆
SS (Pin3)RMp嘉泰姆
Connect a capacitor from the pin to the GND to set the soft-start interval of the converter. An internal 10μA RMp嘉泰姆

current source charges this capacitor to 5.8V. The SS voltage clamps the error amplifier output, and Figure1RMp嘉泰姆

 shows the soft-start interval. At t1, the SS voltage reaches the valley of the oscillator’s triangle wave. TheRMp嘉泰姆

PWM comparator starts to generate a PWM signal to control logic, and theRMp嘉泰姆
COMP (Pin4)RMp嘉泰姆
This pin is the output of the error amplifier. Add an exter-nal resistor and capacitor network to provide theRMp嘉泰姆

 loop com- pensation for the PW M converter (see Application Information).RMp嘉泰姆
FB (Pin5)RMp嘉泰姆
FB pin is the inverter input of the error amplifier and it receives the feedback voltage from an external RMp嘉泰姆

resis-tive divider across the output (V OUT). The output voltage is determined by:RMp嘉泰姆
EN (Pin6)RMp嘉泰姆
Pull the pin higher than 2V to enable the device, and pull the pin lower than 0.8V to shutdown the RMp嘉泰姆

device. In shutdown, the SS is discharged and the UGATE and LGATE pins are held low. The EN pin RMp嘉泰姆

is the open-collector, and it will not be floating. RMp嘉泰姆
GND (Pin7)RMp嘉泰姆
Signal ground for the IC. RMp嘉泰姆
PHASE (Pin8)RMp嘉泰姆
This pin is connected to the source of the high-side MOSFET and is used to monitor the voltage dropRMp嘉泰姆

 across the high-side MOSFET for over-current protection. RMp嘉泰姆
UGATE (Pin9)RMp嘉泰姆
Connect the pin to external MOSFET, and provides the gate drive for the upper MOSFET.RMp嘉泰姆

BOOT (Pin 10)RMp嘉泰姆
This pin provides the supply voltage to the high side MOSFET driver. For driving logic level N-channel RMp嘉泰姆

MOSEFT,a bootstrap circuit can be used to create a suitable driver’s supply. RMp嘉泰姆
PGND (Pin11)RMp嘉泰姆
Power ground for the gate diver. Connect the lower MOSFET source to this pin. RMp嘉泰姆
LGATE (Pin 12)RMp嘉泰姆

Connect the pin to the external MOSFET, and provides the gate drive signal for the lower MOSFET.RMp嘉泰姆
PVCC (Pin13)RMp嘉泰姆
This pin provides a supply voltage for the lower gate drive, connect it to the VCC pin in common use. RMp嘉泰姆
VCC (Pin14)RMp嘉泰姆
This pin provides a supply voltage for the device. When the VCC is above the rising threshold 10.4V, RMp嘉泰姆

the device is turned on; conversely, when the VCC is below the falling threshold, the device is turned off.RMp嘉泰姆
六.电路原理图RMp嘉泰姆


blob.pngRMp嘉泰姆
七,功能概述RMp嘉泰姆


Output Capacitor SelectionRMp嘉泰姆
The selection of COUT is determined by the required effec-tive series resistance (ESR) and voltage ratingRMp嘉泰姆

 rather than the actual capacitance requirement. Therefore, select highperformance low ESR capacitors RMp嘉泰姆

that are intended for switching regulator applications. In some applications,multiple capacitors have toRMp嘉泰姆

 be paralled to achieve the desired ESR value. If tantalum capacitors are used, makesure they are surgeRMp嘉泰姆

 tested by the manufactures. If in doubt,consult the capacitors manufacturer.RMp嘉泰姆
 Input Capacitor SelectionRMp嘉泰姆
The input capacitor is chosen based on the voltage rating and the RMS current rating. For reliable RMp嘉泰姆

operation, select the capacitor voltage rating to be at least 1.3 times higher than the maximum inputRMp嘉泰姆

 voltage. The maximum RMS current rating requirement is approximately IOUT/2 , where IOUT is the RMp嘉泰姆

load current. During power up, the input capaci-tors have to handle large amount of surge current.RMp嘉泰姆

 If tanta-lum capacitors are used, make sure they are surge tested by the manufactures. If in doubt, RMp嘉泰姆

consult the capacitors manufacturer.For high frequency decoupling, a ceramic capacitor be-tweenRMp嘉泰姆

 0.1μF to 1μF can be connected between the VCC and the ground pin.RMp嘉泰姆
Inductor SelectionRMp嘉泰姆
The inductance of the inductor is determined by the out-put voltage requirement. The larger the RMp嘉泰姆

inductance, the lower the inductor’s current ripple. This will translate into lower output ripple voltage.RMp嘉泰姆

 The ripple current and ripple voltage can be approximated by:RMp嘉泰姆
where Fs is the switching frequency of the regulator.There is a tradeoff exists between the inductor’sRMp嘉泰姆

 ripple current and the regulator load transient response time. A smaller inductor will give the regulator RMp嘉泰姆

a faster load tran-sient response at the expense of higher ripple current and vice versa. The maximumRMp嘉泰姆

 ripple current occurs at the maximum input voltage. A good starting point is to choose the ripple RMp嘉泰姆

current to be approximately 30% of the maxi-mum output current.Once the inductance value has RMp嘉泰姆

been chosen, select an inductor that is capable of carrying the required peak cur-rent without going RMp嘉泰姆

into saturation. In some types of inductors, especially core that is make of ferrite, the rippleRMp嘉泰姆
current will increase abruptly when it saturates. This will result in a larger output ripple voltage.RMp嘉泰姆
CompensationRMp嘉泰姆
The output LC filter introduces a double pole, which con-tributes with –40dB/decade gain slope and RMp嘉泰姆

180 degrees phase shift in the control loop. A compensation network between the COMP pin and the RMp嘉泰姆

ground should be added. The simplest loop compensation network is shown inRMp嘉泰姆
Figure 5.RMp嘉泰姆
The output LC filter consists of the output inductor and output capacitors. The transfer function ofRMp嘉泰姆

 the LC filter is given by:RMp嘉泰姆
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5~12RMp嘉泰姆

2500RMp嘉泰姆

CXSD6296A|B|C|DRMp嘉泰姆

SOP8PRMp嘉泰姆

VMRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

25RMp嘉泰姆

3RMp嘉泰姆

13.2RMp嘉泰姆

0.6|0.8RMp嘉泰姆

5~12RMp嘉泰姆

1200RMp嘉泰姆

CXSD6297RMp嘉泰姆

TDFN3x3-10RMp嘉泰姆

VMRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

25RMp嘉泰姆

4RMp嘉泰姆

13.2RMp嘉泰姆

0.8RMp嘉泰姆

5~12RMp嘉泰姆

2000RMp嘉泰姆

CXSD6298RMp嘉泰姆

TDFN3x3-10RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

25RMp嘉泰姆

4.5RMp嘉泰姆

25RMp嘉泰姆

0.6RMp嘉泰姆

5~12RMp嘉泰姆

80RMp嘉泰姆

CXSD6299|ARMp嘉泰姆

SOP-8PRMp嘉泰姆

VMRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

25RMp嘉泰姆

4.5RMp嘉泰姆

13.2RMp嘉泰姆

0.8RMp嘉泰姆

5~12RMp嘉泰姆

16000RMp嘉泰姆

CXSD62100RMp嘉泰姆

TQFN3x3-10RMp嘉泰姆

VMRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

25RMp嘉泰姆

4.5RMp嘉泰姆

13.2RMp嘉泰姆

0.6RMp嘉泰姆

5~12RMp嘉泰姆

2500RMp嘉泰姆

CXSD62101|LRMp嘉泰姆

TDFN3x3-10RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

30RMp嘉泰姆

3RMp嘉泰姆

25RMp嘉泰姆

0.8RMp嘉泰姆

5~12RMp嘉泰姆

2000RMp嘉泰姆

CXSD62102RMp嘉泰姆

TQFN3x3-16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

30RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.6RMp嘉泰姆

5RMp嘉泰姆

600RMp嘉泰姆

CXSD62102ARMp嘉泰姆

TQFN 3x3 16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

30RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.6RMp嘉泰姆

5RMp嘉泰姆

600RMp嘉泰姆

CXSD62103RMp嘉泰姆

QFN4x4-24RMp嘉泰姆

VMRMp嘉泰姆

2RMp嘉泰姆

1RMp嘉泰姆

50RMp嘉泰姆

4.5RMp嘉泰姆

13.2RMp嘉泰姆

0.6RMp嘉泰姆

5~12RMp嘉泰姆

5000RMp嘉泰姆

CXSD62104RMp嘉泰姆

TQFN4x4-24RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

15RMp嘉泰姆

6RMp嘉泰姆

25RMp嘉泰姆

2RMp嘉泰姆

NRMp嘉泰姆

550RMp嘉泰姆

CXSD62105RMp嘉泰姆

TQFN4x4-24RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

15RMp嘉泰姆

6RMp嘉泰姆

25RMp嘉泰姆

2RMp嘉泰姆

NRMp嘉泰姆

550RMp嘉泰姆

CXSD62106|ARMp嘉泰姆

TQFN4x4-4RMp嘉泰姆

TQFN3x3-20RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

20RMp嘉泰姆

3RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

800RMp嘉泰姆

CXSD62107RMp嘉泰姆

TQFN3x3-16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

20RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

400RMp嘉泰姆

CXSD62108RMp嘉泰姆

QFN3.5x3.5-14RMp嘉泰姆

TQFN3x3-16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

20RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

400RMp嘉泰姆

CXSD62109RMp嘉泰姆

TQFN3x3-16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

20RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

400RMp嘉泰姆

CXSD62110RMp嘉泰姆

QFN3x3-20RMp嘉泰姆

TQFN3x3-16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

20RMp嘉泰姆

3RMp嘉泰姆

28RMp嘉泰姆

1.8|1.5|0.5RMp嘉泰姆

5RMp嘉泰姆

740RMp嘉泰姆

CXSD62111RMp嘉泰姆

TQFN4x4-24RMp嘉泰姆

|QFN3x3-20RMp嘉泰姆

CMRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

15RMp嘉泰姆

5RMp嘉泰姆

28RMp嘉泰姆

0.5RMp嘉泰姆

NRMp嘉泰姆

3000RMp嘉泰姆

CXSD62112RMp嘉泰姆

TDFN3x3-10RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

20RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.5RMp嘉泰姆

5RMp嘉泰姆

250RMp嘉泰姆

CXSD62113|CRMp嘉泰姆

TQFN3x3-20RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

15RMp嘉泰姆

6RMp嘉泰姆

25RMp嘉泰姆

2RMp嘉泰姆

NRMp嘉泰姆

550RMp嘉泰姆

CXSD62113ERMp嘉泰姆

TQFN 3x3 20RMp嘉泰姆

COTRMp嘉泰姆

2RMp嘉泰姆

2RMp嘉泰姆

11RMp嘉泰姆

6RMp嘉泰姆

25RMp嘉泰姆

2RMp嘉泰姆

NRMp嘉泰姆

550RMp嘉泰姆

CXSD62114RMp嘉泰姆

TQFN3x3-20RMp嘉泰姆

COTRMp嘉泰姆

2RMp嘉泰姆

2RMp嘉泰姆

11RMp嘉泰姆

5.5RMp嘉泰姆

25RMp嘉泰姆

2RMp嘉泰姆

NRMp嘉泰姆

280RMp嘉泰姆

CXSD62115RMp嘉泰姆

QFN4x4-24RMp嘉泰姆

VMRMp嘉泰姆

2RMp嘉泰姆

1RMp嘉泰姆

60RMp嘉泰姆

3.1RMp嘉泰姆

13.2RMp嘉泰姆

0.85RMp嘉泰姆

12RMp嘉泰姆

5000RMp嘉泰姆

CXSD62116A|B|CRMp嘉泰姆

SOP-8PRMp嘉泰姆

VMRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

20RMp嘉泰姆

2.9RMp嘉泰姆

13.2RMp嘉泰姆

0.8RMp嘉泰姆

12RMp嘉泰姆

16000RMp嘉泰姆

CXSD62117RMp嘉泰姆

SOP-20RMp嘉泰姆

VMRMp嘉泰姆

2RMp嘉泰姆

2RMp嘉泰姆

30RMp嘉泰姆

10RMp嘉泰姆

13.2RMp嘉泰姆

1RMp嘉泰姆

12RMp嘉泰姆

5000RMp嘉泰姆

CXSD62118RMp嘉泰姆

TDFN3x3-10RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

1RMp嘉泰姆

25RMp嘉泰姆

1.8RMp嘉泰姆

28RMp嘉泰姆

0.7RMp嘉泰姆

5RMp嘉泰姆

250RMp嘉泰姆

CXSD62119RMp嘉泰姆

TQFN3x3-20RMp嘉泰姆

COTRMp嘉泰姆

2RMp嘉泰姆

1RMp嘉泰姆

40RMp嘉泰姆

1.8RMp嘉泰姆

25RMp嘉泰姆

REFIN SettingRMp嘉泰姆

5RMp嘉泰姆

700RMp嘉泰姆

CXSD62120RMp嘉泰姆

QFN 3x3 20RMp嘉泰姆

TQFN 3x3 16RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

20RMp嘉泰姆

3RMp嘉泰姆

28RMp嘉泰姆

1.8|1.5 1.35|1.2 0.5RMp嘉泰姆

5RMp嘉泰姆

800RMp嘉泰姆

CXSD62121ARMp嘉泰姆

TQFN3x3 20RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

15RMp嘉泰姆

3RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

220RMp嘉泰姆

CXSD62121BRMp嘉泰姆

TQFN3x3 20RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

15RMp嘉泰姆

3RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

220RMp嘉泰姆

CXSD62121RMp嘉泰姆

TQFN3x3-20RMp嘉泰姆

COTRMp嘉泰姆

1RMp嘉泰姆

2RMp嘉泰姆

20RMp嘉泰姆

3RMp嘉泰姆

28RMp嘉泰姆

0.75RMp嘉泰姆

5RMp嘉泰姆

180RMp嘉泰姆

 RMp嘉泰姆

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