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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 >CXSD6295电压模式固定300kHz开关频率同步降压变换器许宽输入电压对于vario为单个5~12V或两个电源电压
CXSD6295电压模式固定300kHz开关频率同步降压变换器许宽输入电压对于vario为单个5~12V或两个电源电压
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CXSD6295允许宽输入电压,可以是单个5~12V或两个电源电压,适用于各种应用。上电复位(POR)电路监测VCC电源电压,以防止错误的逻辑控制。内置的软启动电路可防止输出电压过冲,并限制输入电流。为了满足低输出电压应用的要求,设计了一种高精度的0.8V温度补偿参考电压源。

CXSD6295电压模式固定300kHz开关频率同步降压变换器许宽输入电压对于vario为单个5~12V或两个电源电压
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产品简介

目录asG嘉泰姆

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

一,产品概述(General Description)   asG嘉泰姆


 The CXSD6295 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXSD6295 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A built-in soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V tempera ture-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The CXSD6295 provides excellent out put voltage regulations against load current variation.The controller’s over-current protection monitors the out-put current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In addition, the CXSD6295 also integrates excellent protection functions: The over-voltage protection (OVP) , under voltage protection (UVP). OVP circuit which monitors the FB voltage to prevent the PWM output from over-voltage,and UVP circuit which monitors the FB voltage to prevent the PWM output from under-voltage or short-circuit.asG嘉泰姆
  The CXSD6295 is available in SOP-8P and TDFN3x3-10 packages.asG嘉泰姆
二.产品特点(Features)asG嘉泰姆


1.)Wide 5V to 12V Supply VoltageasG嘉泰姆
2.)Power-On-Reset Monitoring on VCCasG嘉泰姆
3.)Excellent Output Voltage RegulationsasG嘉泰姆
     0.8V Internal ReferenceasG嘉泰姆
     ±1% Over-Temperature RangeasG嘉泰姆
4.)Integrated Soft-StartasG嘉泰姆
5.)Voltage Mode PWM Operation with External CompensationasG嘉泰姆
6.)Up to 90% Duty Ratio for Fast Transient ResponseasG嘉泰姆
7.)Constant Switching Frequency  300kHz ±10%asG嘉泰姆
8.)9V Driver Voltage for BOOT Supply with Internal Bootstrap DiodeasG嘉泰姆
9.)Drive Dual Low Cost N-MOSFETs with Adaptive Dead-Time ControlasG嘉泰姆
10.)50% Under-Voltage ProtectionasG嘉泰姆
11.)125% Over-Voltage ProtectionasG嘉泰姆
12.)Adjustable Over-Current Protection ThresholdasG嘉泰姆
     Using the RDS(ON) of Low-Side MOSFETasG嘉泰姆
13.)Shutdown Control by COMPasG嘉泰姆
14.)Power Good Monitoring (TDFN-10 3mmx3mm Package Only)asG嘉泰姆
    SOP-8P and TDFN3x3-10 PackagesasG嘉泰姆
15.)Lead Free and Green Devices Available (RoHS Compliant)asG嘉泰姆
三,应用范围 (Applications)asG嘉泰姆


Graphic CardsasG嘉泰姆
DSL, Switch HUBasG嘉泰姆
Wireless LanasG嘉泰姆
Notebook ComputerasG嘉泰姆
Mother BoardasG嘉泰姆
LCD Monitor/TVasG嘉泰姆
四.下载产品资料PDF文档 asG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asG嘉泰姆

 QQ截图20160419174301.jpgasG嘉泰姆

五,产品封装图 (Package)asG嘉泰姆


blob.pngasG嘉泰姆

六.电路原理图asG嘉泰姆


blob.pngblob.pngasG嘉泰姆

七,功能概述asG嘉泰姆


Output Capacitor SelectionasG嘉泰姆
The selection of COUT is determined by the required effec-tive series resistance (ESR) and voltageasG嘉泰姆
rating rather than the actual capacitance requirement. Therefore, selecting high performance low ESRasG嘉泰姆
capacitors is intended for switching regulator applications. In some applications,multiple capacitors haveasG嘉泰姆
to be paralleled to achieve the desired ESR value. If tantalum capacitors are used, make sure they areasG嘉泰姆
surge tested by the manufactures. If in doubt,consult the capacitors manufacturer. asG嘉泰姆
Input Capacitor SelectionasG嘉泰姆
The input capacitor is chosen based on the voltage rat-ing and the RMS current rating. For reliable operation,asG嘉泰姆
select the capacitor voltage rating to be at least 1.3 times higher than the maximum input voltage. The maximumasG嘉泰姆
RMS current rating requirement is approximately IOUT/2 where IOUT is the load current. During power up, theasG嘉泰姆
input capacitors have to handle large amount of surge current.If tantalum capacitors are used, make sure theyasG嘉泰姆
are surge tested by the manufactures. If in doubt, consult the ca-pacitors manufacturer.For high frequencyasG嘉泰姆
decoupling, a ceramic capacitor be-tween 0.1μF to 1μF can connect between VCC and ground pin.asG嘉泰姆
Inductor SelectionasG嘉泰姆
The inductance of the inductor is determined by the out-put voltage requirement. The larger the inductance, asG嘉泰姆

the lower the inductor’s current ripple. This will translate into lower output ripple voltage. The ripple current asG嘉泰姆

and ripple voltage can be approximated by:asG嘉泰姆
×   OUTasG嘉泰姆
FSW × L    VINasG嘉泰姆
where Fs is the switching frequency of the regulator.asG嘉泰姆
∆VOUT = IRIPPLE x ESRasG嘉泰姆
A tradeoff exists between the inductor’s ripple current and the regulator load transient response time. A smallerasG嘉泰姆

 in-ductor will give the regulator a faster load transient re-sponse at the expense of higher ripple current and viceasG嘉泰姆
versa. The maximum ripple current occurs at the maxi-mum input voltage. A good starting point is to choose theasG嘉泰姆
ripple current to be approximately 30% of the maximum output current.Once the inductance value has been chosen, selecting an inductor is capable of carrying the required peak cur-rent without going into saturation. In some types of inductors, especially core that is make of ferrite, the ripple current will increase abruptly when it saturates. This will result in a larger output ripple voltage. asG嘉泰姆
CompensationasG嘉泰姆
The output LC filter of a step down converter introduces a double pole, which contributes with -40dB/decade gainasG嘉泰姆
slope and 180 degrees phase shift in the control loop. A compensation network between COMP pin and groundasG嘉泰姆
should be added. The simplest loop compensation net-work is shown in Figure 5.asG嘉泰姆
The output LC filter consists of the output inductor and output capacitors. The transfer function of the LC filter isasG嘉泰姆
given by:asG嘉泰姆
The FLC is the double poles of the LC filter, and FESR is the zero introduced by the ESR of the output capacitor.asG嘉泰姆

八,相关产品                 更多同类产品...... asG嘉泰姆


Switching Regulator >   Buck ControllerasG嘉泰姆

Part_No asG嘉泰姆

Package asG嘉泰姆

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PhaseasG嘉泰姆

No.ofasG嘉泰姆

PWMasG嘉泰姆

OutputasG嘉泰姆

Output asG嘉泰姆

CurrentasG嘉泰姆

(A) asG嘉泰姆

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Voltage (V) asG嘉泰姆

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5~12asG嘉泰姆

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CXSD6277/A/BasG嘉泰姆

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|QFN5x5-32asG嘉泰姆

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TSSOP-24PasG嘉泰姆

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SOP-8-P|DIP-8asG嘉泰姆

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12asG嘉泰姆

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CXSD6296A|B|C|DasG嘉泰姆

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TQFN3x3-16asG嘉泰姆

COTasG嘉泰姆

1asG嘉泰姆

1asG嘉泰姆

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