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VaW嘉泰姆

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

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


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


1.)Simple Single-Loop Control DesignVaW嘉泰姆
   Voltage-Mode PWM ControlVaW嘉泰姆
2.)Fast Transient ResponseVaW嘉泰姆
    Full 0–100% Duty RatioVaW嘉泰姆
3.)Excellent Output Voltage RegulationVaW嘉泰姆
   0.8V Internal ReferenceVaW嘉泰姆
    ± 1% Over Line Voltage and TemperatureVaW嘉泰姆
4.)Over Current Fault MonitorVaW嘉泰姆
   Uses Upper MOSFETs RDS (ON)VaW嘉泰姆
5.)Converter Can Source and Sink CurrentVaW嘉泰姆
6.)Small Converter SizeVaW嘉泰姆
    200kHz Free-Running OscillatorVaW嘉泰姆
   Programmable from 70kHz to 800kHzVaW嘉泰姆
7.)14-Lead SOIC PackageVaW嘉泰姆
8.)Lead Free and Green Devices Available (RoHS Compliant)VaW嘉泰姆
三,应用范围 (Applications)VaW嘉泰姆


Graphic CardsVaW嘉泰姆
DDR Memory Power SupplyVaW嘉泰姆
DDR Memory Termination VoltageVaW嘉泰姆
Low-Voltage Distributed Power SuppliesVaW嘉泰姆
四.下载产品资料PDF文档 VaW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VaW嘉泰姆

 QQ截图20160419174301.jpgVaW嘉泰姆

五,产品封装图 (Package)VaW嘉泰姆


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

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

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

current source charges this capacitor to 5.8V. The SS voltage clamps the error amplifier output, and Figure1VaW嘉泰姆

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

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

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

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

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

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

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

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

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

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

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


blob.pngVaW嘉泰姆
七,功能概述VaW嘉泰姆


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

 the LC filter is given by:VaW嘉泰姆
八,相关产品                     更多同类产品...... VaW嘉泰姆


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2500VaW嘉泰姆

CXSD6296A|B|C|DVaW嘉泰姆

SOP8PVaW嘉泰姆

VMVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

25VaW嘉泰姆

3VaW嘉泰姆

13.2VaW嘉泰姆

0.6|0.8VaW嘉泰姆

5~12VaW嘉泰姆

1200VaW嘉泰姆

CXSD6297VaW嘉泰姆

TDFN3x3-10VaW嘉泰姆

VMVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

25VaW嘉泰姆

4VaW嘉泰姆

13.2VaW嘉泰姆

0.8VaW嘉泰姆

5~12VaW嘉泰姆

2000VaW嘉泰姆

CXSD6298VaW嘉泰姆

TDFN3x3-10VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

25VaW嘉泰姆

4.5VaW嘉泰姆

25VaW嘉泰姆

0.6VaW嘉泰姆

5~12VaW嘉泰姆

80VaW嘉泰姆

CXSD6299|AVaW嘉泰姆

SOP-8PVaW嘉泰姆

VMVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

25VaW嘉泰姆

4.5VaW嘉泰姆

13.2VaW嘉泰姆

0.8VaW嘉泰姆

5~12VaW嘉泰姆

16000VaW嘉泰姆

CXSD62100VaW嘉泰姆

TQFN3x3-10VaW嘉泰姆

VMVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

25VaW嘉泰姆

4.5VaW嘉泰姆

13.2VaW嘉泰姆

0.6VaW嘉泰姆

5~12VaW嘉泰姆

2500VaW嘉泰姆

CXSD62101|LVaW嘉泰姆

TDFN3x3-10VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

30VaW嘉泰姆

3VaW嘉泰姆

25VaW嘉泰姆

0.8VaW嘉泰姆

5~12VaW嘉泰姆

2000VaW嘉泰姆

CXSD62102VaW嘉泰姆

TQFN3x3-16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

30VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.6VaW嘉泰姆

5VaW嘉泰姆

600VaW嘉泰姆

CXSD62102AVaW嘉泰姆

TQFN 3x3 16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

30VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.6VaW嘉泰姆

5VaW嘉泰姆

600VaW嘉泰姆

CXSD62103VaW嘉泰姆

QFN4x4-24VaW嘉泰姆

VMVaW嘉泰姆

2VaW嘉泰姆

1VaW嘉泰姆

50VaW嘉泰姆

4.5VaW嘉泰姆

13.2VaW嘉泰姆

0.6VaW嘉泰姆

5~12VaW嘉泰姆

5000VaW嘉泰姆

CXSD62104VaW嘉泰姆

TQFN4x4-24VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

15VaW嘉泰姆

6VaW嘉泰姆

25VaW嘉泰姆

2VaW嘉泰姆

NVaW嘉泰姆

550VaW嘉泰姆

CXSD62105VaW嘉泰姆

TQFN4x4-24VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

15VaW嘉泰姆

6VaW嘉泰姆

25VaW嘉泰姆

2VaW嘉泰姆

NVaW嘉泰姆

550VaW嘉泰姆

CXSD62106|AVaW嘉泰姆

TQFN4x4-4VaW嘉泰姆

TQFN3x3-20VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

20VaW嘉泰姆

3VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

800VaW嘉泰姆

CXSD62107VaW嘉泰姆

TQFN3x3-16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

20VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

400VaW嘉泰姆

CXSD62108VaW嘉泰姆

QFN3.5x3.5-14VaW嘉泰姆

TQFN3x3-16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

20VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

400VaW嘉泰姆

CXSD62109VaW嘉泰姆

TQFN3x3-16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

20VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

400VaW嘉泰姆

CXSD62110VaW嘉泰姆

QFN3x3-20VaW嘉泰姆

TQFN3x3-16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

20VaW嘉泰姆

3VaW嘉泰姆

28VaW嘉泰姆

1.8|1.5|0.5VaW嘉泰姆

5VaW嘉泰姆

740VaW嘉泰姆

CXSD62111VaW嘉泰姆

TQFN4x4-24VaW嘉泰姆

|QFN3x3-20VaW嘉泰姆

CMVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

15VaW嘉泰姆

5VaW嘉泰姆

28VaW嘉泰姆

0.5VaW嘉泰姆

NVaW嘉泰姆

3000VaW嘉泰姆

CXSD62112VaW嘉泰姆

TDFN3x3-10VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

20VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.5VaW嘉泰姆

5VaW嘉泰姆

250VaW嘉泰姆

CXSD62113|CVaW嘉泰姆

TQFN3x3-20VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

15VaW嘉泰姆

6VaW嘉泰姆

25VaW嘉泰姆

2VaW嘉泰姆

NVaW嘉泰姆

550VaW嘉泰姆

CXSD62113EVaW嘉泰姆

TQFN 3x3 20VaW嘉泰姆

COTVaW嘉泰姆

2VaW嘉泰姆

2VaW嘉泰姆

11VaW嘉泰姆

6VaW嘉泰姆

25VaW嘉泰姆

2VaW嘉泰姆

NVaW嘉泰姆

550VaW嘉泰姆

CXSD62114VaW嘉泰姆

TQFN3x3-20VaW嘉泰姆

COTVaW嘉泰姆

2VaW嘉泰姆

2VaW嘉泰姆

11VaW嘉泰姆

5.5VaW嘉泰姆

25VaW嘉泰姆

2VaW嘉泰姆

NVaW嘉泰姆

280VaW嘉泰姆

CXSD62115VaW嘉泰姆

QFN4x4-24VaW嘉泰姆

VMVaW嘉泰姆

2VaW嘉泰姆

1VaW嘉泰姆

60VaW嘉泰姆

3.1VaW嘉泰姆

13.2VaW嘉泰姆

0.85VaW嘉泰姆

12VaW嘉泰姆

5000VaW嘉泰姆

CXSD62116A|B|CVaW嘉泰姆

SOP-8PVaW嘉泰姆

VMVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

20VaW嘉泰姆

2.9VaW嘉泰姆

13.2VaW嘉泰姆

0.8VaW嘉泰姆

12VaW嘉泰姆

16000VaW嘉泰姆

CXSD62117VaW嘉泰姆

SOP-20VaW嘉泰姆

VMVaW嘉泰姆

2VaW嘉泰姆

2VaW嘉泰姆

30VaW嘉泰姆

10VaW嘉泰姆

13.2VaW嘉泰姆

1VaW嘉泰姆

12VaW嘉泰姆

5000VaW嘉泰姆

CXSD62118VaW嘉泰姆

TDFN3x3-10VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

1VaW嘉泰姆

25VaW嘉泰姆

1.8VaW嘉泰姆

28VaW嘉泰姆

0.7VaW嘉泰姆

5VaW嘉泰姆

250VaW嘉泰姆

CXSD62119VaW嘉泰姆

TQFN3x3-20VaW嘉泰姆

COTVaW嘉泰姆

2VaW嘉泰姆

1VaW嘉泰姆

40VaW嘉泰姆

1.8VaW嘉泰姆

25VaW嘉泰姆

REFIN SettingVaW嘉泰姆

5VaW嘉泰姆

700VaW嘉泰姆

CXSD62120VaW嘉泰姆

QFN 3x3 20VaW嘉泰姆

TQFN 3x3 16VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

20VaW嘉泰姆

3VaW嘉泰姆

28VaW嘉泰姆

1.8|1.5 1.35|1.2 0.5VaW嘉泰姆

5VaW嘉泰姆

800VaW嘉泰姆

CXSD62121AVaW嘉泰姆

TQFN3x3 20VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

15VaW嘉泰姆

3VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

220VaW嘉泰姆

CXSD62121BVaW嘉泰姆

TQFN3x3 20VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

15VaW嘉泰姆

3VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

220VaW嘉泰姆

CXSD62121VaW嘉泰姆

TQFN3x3-20VaW嘉泰姆

COTVaW嘉泰姆

1VaW嘉泰姆

2VaW嘉泰姆

20VaW嘉泰姆

3VaW嘉泰姆

28VaW嘉泰姆

0.75VaW嘉泰姆

5VaW嘉泰姆

180VaW嘉泰姆

 VaW嘉泰姆

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