CXSD6296A|B|C|D宽输入电压单个5~12V或两个电源电压上电复位（POR）电路监测VCC电源电压内置的软启动电路可防止输出电压过冲

目录Bgz嘉泰姆

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

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

  The CXSD6296 CXSD6296A JTMA872B CXSD6296C CXSD6296D is a voltage mode, fixed 200kHz/300kHz/600kHz switching frequency, synchronous buck converter.The CXSD6296 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 over-shoot as well as limits the input current. An internal 0.6V temperature-ompensated reference voltage with high accuracy is designed to meet the requirement of low out-put voltage applications. The CXSD6296 provides excel-lent output voltage regulations against load current variation.Bgz嘉泰姆
   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 cur-rent sensing resistor that features high efficiency and low cost. In  addition, the CXSD6296 also integrates excel-lent protection functions. The over-voltage protection (OVP) , under-voltage protection (UVP). OVP circuit which moni-tors 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.Bgz嘉泰姆
  The CXSD6296 is available in SOP-8P packagesBgz嘉泰姆
二.产品特点(Features)Bgz嘉泰姆

1.）Wide 5V to 12V Supply VoltageBgz嘉泰姆
2.）Power-On-Reset Monitoring on VCCBgz嘉泰姆
3.）Excellent Output Voltage RegulationsBgz嘉泰姆
      - 0.6V Internal Reference for CXSD6296/A/DBgz嘉泰姆
      - 0.8V Internal Reference for CXSD6296B/CBgz嘉泰姆
      - ±0.6% Over-Temperature RangeBgz嘉泰姆
4.）Integrated Soft-StartBgz嘉泰姆
5.）Voltage Mode PWM Operation with External CompensationBgz嘉泰姆
6.）Up to 90% Duty Ratio for Fast Transient ResponseBgz嘉泰姆
7.）Constant Switching FrequencyBgz嘉泰姆
      - 300kHz ±10% for CXSD6296/BBgz嘉泰姆
      - 200kHz ±10% for CXSD6296CBgz嘉泰姆
      - 600kHz ±10% for CXSD6296A/DBgz嘉泰姆
8.）Integrated Bootstrap Forward P-CH MOSFETBgz嘉泰姆
9.）50% Under-Voltage ProtectionBgz嘉泰姆
10.）125% Over-Voltage ProtectionBgz嘉泰姆
11.）Adjustable Over-Current Protection ThresholdBgz嘉泰姆
       - Using the RDS(ON) of Low-Side MOSFETBgz嘉泰姆
12.）Shutdown Control by COMP SOP-8P PackageBgz嘉泰姆
13.）Lead Free and Green Devices AvailableBgz嘉泰姆
三,应用范围 (Applications)Bgz嘉泰姆

Graphic CardsBgz嘉泰姆
DSL, Switch HUBBgz嘉泰姆
Wireless LanBgz嘉泰姆
Notebook ComputerBgz嘉泰姆
Mother BoardBgz嘉泰姆
LCD Monitor/TVBgz嘉泰姆
四.下载产品资料PDF文档 Bgz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！Bgz嘉泰姆

 Bgz嘉泰姆

五,产品封装图 (Package)Bgz嘉泰姆

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六.电路原理图Bgz嘉泰姆

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七,功能概述Bgz嘉泰姆

In any high switching frequency converter, a correct lay-out is important to ensure proper operation of theBgz嘉泰姆
regulator. With power devices switching at 300kHz,the resulting current transient will cause voltage spikeBgz嘉泰姆
across the interconnecting impedance and parasitic circuit elements. As an example, consider the turn-offBgz嘉泰姆
transition of the PWM MOSFET. Before turn-off, the MOSFET is car-rying the full load current. During turn-off,Bgz嘉泰姆
current stops flowing in the MOSFET and is free-wheeling by the lower MOSFET and parasitic diode. AnyBgz嘉泰姆
parasitic inductance of the circuit generates a large voltage spike during the switching interval. In general,Bgz嘉泰姆
using short and wide printed circuit traces should minimize interconnecting imped ances and the magnitudeBgz嘉泰姆
of voltage spike. And signal and power grounds are to be kept separate till combined using ground planeBgz嘉泰姆
construction or single point grounding. Figure 8. illustrates the layout, with bold lines indicating high currentBgz嘉泰姆
paths; these traces must be short and wide. Components along the bold lines should be placed lose together.Bgz嘉泰姆
Below is a checklist for your layout:Bgz嘉泰姆
- Keep the switching nodes (UGATE, LGATE, and PHASE)away from sensitive small signal nodes since theseBgz嘉泰姆
nodes are fast moving signals. Therefore, keep traces to these nodes as short as possible.Bgz嘉泰姆
- The traces from the gate drivers to the MOSFETs (UGand LG) should be short and wide.Bgz嘉泰姆
- Place the source of the high-side MOSFET and the drain of the low-side MOSFET as close as possible. Minimiz-Bgz嘉泰姆
ing the impedance with wide layout plane between the two pads reduces the voltage bounce of the node.Bgz嘉泰姆
- Decoupling capacitor, compensation component, the resistor dividers, and boot capacitors should be closeBgz嘉泰姆
their pins. (For example, place the decoupling ceramic capacitor near the drain of the high-side MOSFET asBgz嘉泰姆
close as possible. The bulk capacitors are also placed near the drain).Bgz嘉泰姆
- The input capacitor should be near the drain of the up-per MOSFET; the output capacitor should be near theBgz嘉泰姆
loads. The input capacitor GND should be close to the output capacitor GND and the lower MOSFET GND.Bgz嘉泰姆
The drain of the MOSFETs (VIN and PHASE nodes) should be a large plane for heat sinking.Bgz嘉泰姆
- The ROCSET resistance should be placed near the IC as close as possible.Bgz嘉泰姆

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