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首页 > 产品中心 > 电源管理 > DC降压型芯片 > Buck降压型芯片 >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
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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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ZSu嘉泰姆

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

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


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


1.)Simple Single-Loop Control DesignZSu嘉泰姆
   Voltage-Mode PWM ControlZSu嘉泰姆
2.)Fast Transient ResponseZSu嘉泰姆
    Full 0–100% Duty RatioZSu嘉泰姆
3.)Excellent Output Voltage RegulationZSu嘉泰姆
   0.8V Internal ReferenceZSu嘉泰姆
    ± 1% Over Line Voltage and TemperatureZSu嘉泰姆
4.)Over Current Fault MonitorZSu嘉泰姆
   Uses Upper MOSFETs RDS (ON)ZSu嘉泰姆
5.)Converter Can Source and Sink CurrentZSu嘉泰姆
6.)Small Converter SizeZSu嘉泰姆
    200kHz Free-Running OscillatorZSu嘉泰姆
   Programmable from 70kHz to 800kHzZSu嘉泰姆
7.)14-Lead SOIC PackageZSu嘉泰姆
8.)Lead Free and Green Devices Available (RoHS Compliant)ZSu嘉泰姆
三,应用范围 (Applications)ZSu嘉泰姆


Graphic CardsZSu嘉泰姆
DDR Memory Power SupplyZSu嘉泰姆
DDR Memory Termination VoltageZSu嘉泰姆
Low-Voltage Distributed Power SuppliesZSu嘉泰姆
四.下载产品资料PDF文档 ZSu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ZSu嘉泰姆

 QQ截图20160419174301.jpgZSu嘉泰姆

五,产品封装图 (Package)ZSu嘉泰姆


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

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

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

current source charges this capacitor to 5.8V. The SS voltage clamps the error amplifier output, and Figure1ZSu嘉泰姆

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

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

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

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

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

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

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

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

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

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

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


blob.pngZSu嘉泰姆
七,功能概述ZSu嘉泰姆


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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13.2ZSu嘉泰姆

0.6ZSu嘉泰姆

5~12ZSu嘉泰姆

4000ZSu嘉泰姆

CXSD6295ZSu嘉泰姆

SOP8PZSu嘉泰姆

TDFN3x3-10ZSu嘉泰姆

VMZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

20ZSu嘉泰姆

3ZSu嘉泰姆

13.2ZSu嘉泰姆

0.8ZSu嘉泰姆

5~12ZSu嘉泰姆

2500ZSu嘉泰姆

CXSD6296A|B|C|DZSu嘉泰姆

SOP8PZSu嘉泰姆

VMZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

25ZSu嘉泰姆

3ZSu嘉泰姆

13.2ZSu嘉泰姆

0.6|0.8ZSu嘉泰姆

5~12ZSu嘉泰姆

1200ZSu嘉泰姆

CXSD6297ZSu嘉泰姆

TDFN3x3-10ZSu嘉泰姆

VMZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

25ZSu嘉泰姆

4ZSu嘉泰姆

13.2ZSu嘉泰姆

0.8ZSu嘉泰姆

5~12ZSu嘉泰姆

2000ZSu嘉泰姆

CXSD6298ZSu嘉泰姆

TDFN3x3-10ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

25ZSu嘉泰姆

4.5ZSu嘉泰姆

25ZSu嘉泰姆

0.6ZSu嘉泰姆

5~12ZSu嘉泰姆

80ZSu嘉泰姆

CXSD6299|AZSu嘉泰姆

SOP-8PZSu嘉泰姆

VMZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

25ZSu嘉泰姆

4.5ZSu嘉泰姆

13.2ZSu嘉泰姆

0.8ZSu嘉泰姆

5~12ZSu嘉泰姆

16000ZSu嘉泰姆

CXSD62100ZSu嘉泰姆

TQFN3x3-10ZSu嘉泰姆

VMZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

25ZSu嘉泰姆

4.5ZSu嘉泰姆

13.2ZSu嘉泰姆

0.6ZSu嘉泰姆

5~12ZSu嘉泰姆

2500ZSu嘉泰姆

CXSD62101|LZSu嘉泰姆

TDFN3x3-10ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

30ZSu嘉泰姆

3ZSu嘉泰姆

25ZSu嘉泰姆

0.8ZSu嘉泰姆

5~12ZSu嘉泰姆

2000ZSu嘉泰姆

CXSD62102ZSu嘉泰姆

TQFN3x3-16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

30ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.6ZSu嘉泰姆

5ZSu嘉泰姆

600ZSu嘉泰姆

CXSD62102AZSu嘉泰姆

TQFN 3x3 16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

30ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.6ZSu嘉泰姆

5ZSu嘉泰姆

600ZSu嘉泰姆

CXSD62103ZSu嘉泰姆

QFN4x4-24ZSu嘉泰姆

VMZSu嘉泰姆

2ZSu嘉泰姆

1ZSu嘉泰姆

50ZSu嘉泰姆

4.5ZSu嘉泰姆

13.2ZSu嘉泰姆

0.6ZSu嘉泰姆

5~12ZSu嘉泰姆

5000ZSu嘉泰姆

CXSD62104ZSu嘉泰姆

TQFN4x4-24ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

15ZSu嘉泰姆

6ZSu嘉泰姆

25ZSu嘉泰姆

2ZSu嘉泰姆

NZSu嘉泰姆

550ZSu嘉泰姆

CXSD62105ZSu嘉泰姆

TQFN4x4-24ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

15ZSu嘉泰姆

6ZSu嘉泰姆

25ZSu嘉泰姆

2ZSu嘉泰姆

NZSu嘉泰姆

550ZSu嘉泰姆

CXSD62106|AZSu嘉泰姆

TQFN4x4-4ZSu嘉泰姆

TQFN3x3-20ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

20ZSu嘉泰姆

3ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

800ZSu嘉泰姆

CXSD62107ZSu嘉泰姆

TQFN3x3-16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

20ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

400ZSu嘉泰姆

CXSD62108ZSu嘉泰姆

QFN3.5x3.5-14ZSu嘉泰姆

TQFN3x3-16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

20ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

400ZSu嘉泰姆

CXSD62109ZSu嘉泰姆

TQFN3x3-16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

20ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

400ZSu嘉泰姆

CXSD62110ZSu嘉泰姆

QFN3x3-20ZSu嘉泰姆

TQFN3x3-16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

20ZSu嘉泰姆

3ZSu嘉泰姆

28ZSu嘉泰姆

1.8|1.5|0.5ZSu嘉泰姆

5ZSu嘉泰姆

740ZSu嘉泰姆

CXSD62111ZSu嘉泰姆

TQFN4x4-24ZSu嘉泰姆

|QFN3x3-20ZSu嘉泰姆

CMZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

15ZSu嘉泰姆

5ZSu嘉泰姆

28ZSu嘉泰姆

0.5ZSu嘉泰姆

NZSu嘉泰姆

3000ZSu嘉泰姆

CXSD62112ZSu嘉泰姆

TDFN3x3-10ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

20ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.5ZSu嘉泰姆

5ZSu嘉泰姆

250ZSu嘉泰姆

CXSD62113|CZSu嘉泰姆

TQFN3x3-20ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

15ZSu嘉泰姆

6ZSu嘉泰姆

25ZSu嘉泰姆

2ZSu嘉泰姆

NZSu嘉泰姆

550ZSu嘉泰姆

CXSD62113EZSu嘉泰姆

TQFN 3x3 20ZSu嘉泰姆

COTZSu嘉泰姆

2ZSu嘉泰姆

2ZSu嘉泰姆

11ZSu嘉泰姆

6ZSu嘉泰姆

25ZSu嘉泰姆

2ZSu嘉泰姆

NZSu嘉泰姆

550ZSu嘉泰姆

CXSD62114ZSu嘉泰姆

TQFN3x3-20ZSu嘉泰姆

COTZSu嘉泰姆

2ZSu嘉泰姆

2ZSu嘉泰姆

11ZSu嘉泰姆

5.5ZSu嘉泰姆

25ZSu嘉泰姆

2ZSu嘉泰姆

NZSu嘉泰姆

280ZSu嘉泰姆

CXSD62115ZSu嘉泰姆

QFN4x4-24ZSu嘉泰姆

VMZSu嘉泰姆

2ZSu嘉泰姆

1ZSu嘉泰姆

60ZSu嘉泰姆

3.1ZSu嘉泰姆

13.2ZSu嘉泰姆

0.85ZSu嘉泰姆

12ZSu嘉泰姆

5000ZSu嘉泰姆

CXSD62116A|B|CZSu嘉泰姆

SOP-8PZSu嘉泰姆

VMZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

20ZSu嘉泰姆

2.9ZSu嘉泰姆

13.2ZSu嘉泰姆

0.8ZSu嘉泰姆

12ZSu嘉泰姆

16000ZSu嘉泰姆

CXSD62117ZSu嘉泰姆

SOP-20ZSu嘉泰姆

VMZSu嘉泰姆

2ZSu嘉泰姆

2ZSu嘉泰姆

30ZSu嘉泰姆

10ZSu嘉泰姆

13.2ZSu嘉泰姆

1ZSu嘉泰姆

12ZSu嘉泰姆

5000ZSu嘉泰姆

CXSD62118ZSu嘉泰姆

TDFN3x3-10ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

1ZSu嘉泰姆

25ZSu嘉泰姆

1.8ZSu嘉泰姆

28ZSu嘉泰姆

0.7ZSu嘉泰姆

5ZSu嘉泰姆

250ZSu嘉泰姆

CXSD62119ZSu嘉泰姆

TQFN3x3-20ZSu嘉泰姆

COTZSu嘉泰姆

2ZSu嘉泰姆

1ZSu嘉泰姆

40ZSu嘉泰姆

1.8ZSu嘉泰姆

25ZSu嘉泰姆

REFIN SettingZSu嘉泰姆

5ZSu嘉泰姆

700ZSu嘉泰姆

CXSD62120ZSu嘉泰姆

QFN 3x3 20ZSu嘉泰姆

TQFN 3x3 16ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

20ZSu嘉泰姆

3ZSu嘉泰姆

28ZSu嘉泰姆

1.8|1.5 1.35|1.2 0.5ZSu嘉泰姆

5ZSu嘉泰姆

800ZSu嘉泰姆

CXSD62121AZSu嘉泰姆

TQFN3x3 20ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

15ZSu嘉泰姆

3ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

220ZSu嘉泰姆

CXSD62121BZSu嘉泰姆

TQFN3x3 20ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

15ZSu嘉泰姆

3ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

220ZSu嘉泰姆

CXSD62121ZSu嘉泰姆

TQFN3x3-20ZSu嘉泰姆

COTZSu嘉泰姆

1ZSu嘉泰姆

2ZSu嘉泰姆

20ZSu嘉泰姆

3ZSu嘉泰姆

28ZSu嘉泰姆

0.75ZSu嘉泰姆

5ZSu嘉泰姆

180ZSu嘉泰姆

 ZSu嘉泰姆

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