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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 >CXSD62116A|B|C电压模式固定300kHz开关频率和同步降压控制器两个电源电压模式
CXSD62116A|B|C电压模式固定300kHz开关频率和同步降压控制器两个电源电压模式
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CXSD62116A|B|C允许宽输入电压它可以是一个5~12V的电源电压,也可以是两个不同应用的电源电压。上电复位(POR)电路监测VCC电源电压以防止逻辑控制错误。内置数字软启动电路防止输出电压过冲以及限制输入电流。内线0.6V高精度温度补偿参考电压设计满足低输出电压应用的要求

CXSD62116A|B|C电压模式固定300kHz开关频率和同步降压控制器两个电源电压模式
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产品简介

目录qzh嘉泰姆

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

一,产品概述(General Description)         qzh嘉泰姆
        The CXSD62116A/B/C is a voltage mode, fixed 300kHz-switching frequency,qzh嘉泰姆
and synchronous buck controller. The CXSD62116A/B/C allows wide input voltageqzh嘉泰姆
that is either a single 5~12V or two supply voltage(s) for various applications.qzh嘉泰姆
A power-on-reset (POR) circuit monitors the VCC supply voltage to preventqzh嘉泰姆
wrong logic controls. A built-in digital soft-start circuit prevents the outputqzh嘉泰姆
voltages from overshoot as well as limits the input current. An internalqzh嘉泰姆
0.6V temperature-compensated reference voltage with high accuracy isqzh嘉泰姆
designed to meet the requirement of low output voltage applications.qzh嘉泰姆
The CXSD62116A/B/C provides excellent output voltage regulations againstqzh嘉泰姆
load current variation.qzh嘉泰姆
     The controller’s over-current protection monitors the output currentqzh嘉泰姆
by using the voltage drops across the RDS(ON)of low-side MOSFET,qzh嘉泰姆
eliminating the need for a current sensing resistor that features highqzh嘉泰姆
efficiency and low cost.qzh嘉泰姆
     The CXSD62116A/B/C also integrates over-voltage protection (OVP) andqzh嘉泰姆
under-voltage protection circuit which moni-tors the FB voltage to preventqzh嘉泰姆
the PWM output from over and under voltage.qzh嘉泰姆
     The CXSD62116A/B/C is available in a simple SOP-8P package.qzh嘉泰姆
二.产品特点(Features)qzh嘉泰姆
Wide Operation Supply Voltage from 5V to 12Vqzh嘉泰姆
Power-On-Reset Monitoring on VCC qzh嘉泰姆
Excellent Reference Voltage Regulationsqzh嘉泰姆
- 0.6V Internal Referenceqzh嘉泰姆
- ±1% Over Temperature Rangeqzh嘉泰姆
Integrated Soft-Startqzh嘉泰姆
Automatic PSM/PWM Modesqzh嘉泰姆
Voltage Mode PWM Operation with 90% (Max.) Duty Cycleqzh嘉泰姆
Under-Voltage Protectionqzh嘉泰姆
Adjustable Over-Current Protection Thresholdqzh嘉泰姆
- Sensing the RDS(ON) of Low-Side MOSFETqzh嘉泰姆
Over-Voltage Protectionqzh嘉泰姆
Under-Voltage Protectionqzh嘉泰姆
Simple SOP-8P Packageqzh嘉泰姆
Lead Free and Green Devices Availableqzh嘉泰姆
(RoHS Compliant)qzh嘉泰姆
三,应用范围 (Applications)qzh嘉泰姆
Graphic Cardsqzh嘉泰姆
DSL, Switch HUBqzh嘉泰姆
Wireless Lanqzh嘉泰姆
Notebook Computerqzh嘉泰姆
Mother Boardqzh嘉泰姆
LCD Monitor/TVqzh嘉泰姆

四.下载产品资料PDF文档 qzh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qzh嘉泰姆

 QQ截图20160419174301.jpgqzh嘉泰姆

五,产品封装图 (Package)qzh嘉泰姆
qzh嘉泰姆
六.电路原理图qzh嘉泰姆

blob.pngqzh嘉泰姆
七,功能概述qzh嘉泰姆
Layout Considerationqzh嘉泰姆
In any high switching frequency converter, a correct lay-out is important to ensure proper operation of theqzh嘉泰姆
regulator. With power devices switching at 300kHz,the resulting current transient will cause voltage spike acrossqzh嘉泰姆
the interconnecting impedance and parasitic circuit elements. As an example, consider the turn-off transitionqzh嘉泰姆
of the PWM MOSFET. Before turn-off, the MOSFET is car rying the full load current. During turn-off, current stopsqzh嘉泰姆
flowing in the MOSFET and is free-wheeling by the lower MOSFET and parasitic diode. Any parasitic inductance ofqzh嘉泰姆
the circuit generates a large voltage spike during the switching interval. In general, using short and wide printedqzh嘉泰姆
circuit traces should minimize interconnecting imped-qzh嘉泰姆

Layout Consideration (Cont.)qzh嘉泰姆
ances and the magnitude of voltage spike. And signal and power grounds are to be kept separate till combinedqzh嘉泰姆

using ground plane construction or single point grounding. Figure 8. illustrates the layout, with bold linesqzh嘉泰姆
indicating high current paths; these traces must be short and wide. Components along the bold lines should beqzh嘉泰姆

placed lose together. Below is a checklist for your layout:qzh嘉泰姆

- Keep the switching nodes (UGATE, LGATE, and PHASE) away from sensitive small signal nodes since theseqzh嘉泰姆

nodes are fast moving signals. Therefore, keep traces to these nodes as short as possible.qzh嘉泰姆

- The traces from the gate drivers to the MOSFETs (UG and LG) should be short and wide.qzh嘉泰姆

- Place the source of the high-side MOSFET and the drain of the low-side MOSFET as close as possible. Minimiz-qzh嘉泰姆
ing the impedance with wide layout plane between the two pads reduces the voltage bounce of the node.qzh嘉泰姆
- Decoupling capacitor, compensation component, the resistor dividers, and boot capacitors should be closeqzh嘉泰姆
their pins. (For example, place the decoupling ceramic capacitor near the drain of the high-side MOSFET asqzh嘉泰姆
close as possible. The bulk capacitors are also placed near the drain).qzh嘉泰姆
- The input capacitor should be near the drain of the up-per MOSFET; the output capacitor should be near theqzh嘉泰姆
loads. The input capacitor GND should be close to the output capacitor GND and the lower MOSFET GND.qzh嘉泰姆
- The drain of the MOSFETs (VIN and PHASE nodes) should be a large plane for heat sinking.qzh嘉泰姆
- The ROCSET resistance should be placed near the IC as close as possible.Close to ICqzh嘉泰姆
Figure 8. Layout Guidelinesqzh嘉泰姆

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