2A异步降压型转换器CXSD62123电流模式控制4.5~26V的输入电压PSM/PWM模式下调节输出电压
发表时间:2020-04-24
浏览次数:96

目录Tap嘉泰姆

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

一,产品概述(General Description)         Tap嘉泰姆
        The CXSD62123 is a 2A, asynchronous, step-down con-verter with integratedTap嘉泰姆
100mΩ P-channel MOSFET. The device, with current-mode control scheme, canTap嘉泰姆
convert 4.5~26V input voltage to the output voltage adjustable from 0.8 to 90%Tap嘉泰姆

 VIN to provide excellent output voltage regulation.Tap嘉泰姆
        The CXSD62123 regulates the output voltage in automatic PSM/PWM modeTap嘉泰姆
operation, depending on the output  current, for high efficiency operation over lightTap嘉泰姆
to full load current. The CXSD62123 is also equipped with power-on-reset, soft-start, and whole protections (under-voltage,over- temperature, and current-limit) Tap嘉泰姆

into a single package.In shutdown mode, the supply current drops below 5μA.Tap嘉泰姆

This device, available in a 8-pin SOP-8 package, pro-vides a very compact Tap嘉泰姆

system solution with minimal exter-nal components.Tap嘉泰姆
二.产品特点(Features)Tap嘉泰姆
Wide Input Voltage from 4.5V to 26VTap嘉泰姆
Output Current up to 2ATap嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINTap嘉泰姆
- 0.8V Reference VoltageTap嘉泰姆
- ±2.5% System AccuracyTap嘉泰姆
100m Integrated P-Channel Power MOSFETTap嘉泰姆
High Efficiency up to 91%Tap嘉泰姆
- Pulse-Skipping Mode (PSM) / PWM Mode Op-erationTap嘉泰姆
Current-Mode OperationTap嘉泰姆
- Stable with Ceramic Output CapacitorsTap嘉泰姆
- Fast Transient ResponseTap嘉泰姆
Power-On-Reset MonitoringTap嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModeTap嘉泰姆
Built-in Digital Soft-StartTap嘉泰姆
Output Current-Limit Protection with Frequency FoldbackTap嘉泰姆
70% Under-Voltage ProtectionTap嘉泰姆
Over-Temperature ProtectionTap嘉泰姆
<5μA Quiescent Current During Shutdown SOP-8 PackageTap嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)Tap嘉泰姆
三,应用范围 (Applications)Tap嘉泰姆
LCD Monitor / TVTap嘉泰姆
Set-Top BoxTap嘉泰姆
Portable DVDTap嘉泰姆
Wireless LANTap嘉泰姆
ADSL, Switch HUBTap嘉泰姆
Notebook ComputerTap嘉泰姆
Step-Down Converters Requiring High Efficiency and 2A Output CurrentTap嘉泰姆

四.下载产品资料PDF文档 Tap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Tap嘉泰姆

 QQ截图20160419174301.jpgTap嘉泰姆

五,产品封装图 (Package)Tap嘉泰姆

Tap嘉泰姆
六.电路原理图Tap嘉泰姆
blob.pngTap嘉泰姆
blob.pngTap嘉泰姆

七,功能概述Tap嘉泰姆


Inductor Value CalculationTap嘉泰姆
The operating frequency and inductor selection are interrelated in that higher operating frequencies permit the use of a smaller inductor for the same amount of inductorripple current. However, this is at the expense of efficiencyTap嘉泰姆
due to an increase in MOSFET gate charge losses. The equation (2) shows that the inductance value has a directTap嘉泰姆
effect on ripple current.Accepting larger values of ripple current allows the use of low inductances but results inTap嘉泰姆
higher output voltage ripple and greater core losses. A reasonable starting point for setting ripple current isTap嘉泰姆
∆I ≤ 0.4. IOUT(MAX). Remember, the maximum ripple current occurs at the maximum input voltage. Tap嘉泰姆
Output Diode SelectionTap嘉泰姆
The Schottky diode carries load current during the offtime. Therefore, the average diode current is dependentTap嘉泰姆
on the P-channel power MOSFET duty cycle. At high input voltages, the diode conducts most of the time. As VIN ap-proaches VOUT, the diode conducts only a small fraction of the time. The most stressful condition for the diode is when the output is short-circuited. Therefore, it is important to adequately specify the diode peak current and av-Tap嘉泰姆
erage power dissipation so as not to exceed the diode ratings.Tap嘉泰姆
In high power switching regulator, a correct layout is important to ensure proper operation of the regulator. InTap嘉泰姆
general, interconnecting impedance should be minimized by using short and wide printed circuit traces. Signal andTap嘉泰姆
power grounds are to be kept separating and finally c om bined using ground plane construction orTap嘉泰姆
single point grounding. Figure 2 illustrates the layout,with bold lines indicating high current paths. Components along the bold lines should be placed close together.Tap嘉泰姆
Below is a checklist for your layout:Tap嘉泰姆
pedances should be minimized by using wide and short printed circuit traces.Tap嘉泰姆
3. Keep the sensitive small signal nodes (FB, COMP)away from switching nodes (LX or others) on the PCB.Tap嘉泰姆
Therefore, place the feedback divider and the feedback compensation network close to the IC to avoid switch-Tap嘉泰姆
ing noise. Connect the ground of feedback divider directly to the GND pin of the IC using a dedicatedTap嘉泰姆
ground trace.Tap嘉泰姆
4. The VCC decoupling capacitor should be right next to the VCC and GND pins. Capacitor C2 should beTap嘉泰姆
connected as close to the VIN and UGND pins as possible.Tap嘉泰姆
5. Place the decoupling ceramic capacitor C1 near the VIN as close as possible. The bulk capacitors C8 areTap嘉泰姆
also placed near VIN. Use a wide power ground plane to connect the C1, C8, C4, and Schottky diode to pro-Tap嘉泰姆
vide a low impedance path between the components for large and high slew rate current.Tap嘉泰姆
八,相关产品             更多同类产品.......Tap嘉泰姆


Switching Regulator > Buck ConverterTap嘉泰姆

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