目录WDu嘉泰姆

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

一,产品概述(General Description)   WDu嘉泰姆

  The CXSD62122 is a 5A, synchronous, step-down converter with integrated 50mΩ P-channel power MOSFET and 20mΩ N-channel power MOSFET.The device, with cur-rent-mode control scheme, can convert 4.5~26V input volt-age to the output voltage adjustable from 0.8 to 90% VIN to provide excellent output voltage regulation.WDu嘉泰姆
  The CXSD62122 regulates the output voltage in an auto-matic PSM/PWM mode operation, depending on the out-put current, for high efficiency operation over light to full load current. The CXSD62122 is also equipped with power-WDu嘉泰姆
on-reset, soft-start, and whole protections (including over- voltage, under-voltage, over-temperature, and current-limit) in a single package. In shutdown mode, the supply current drops below 5μA.This device, available in 28-pin TQFN5x6 package, pro-vides a very compact system solution with minimal exter-WDu嘉泰姆
nal components and good thermal conductance.WDu嘉泰姆
二.产品特点(Features)WDu嘉泰姆

Wide Input Voltage from 4.5V to 26VWDu嘉泰姆
Output Current Up to 5AWDu嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINWDu嘉泰姆
- 0.8V Reference VoltageWDu嘉泰姆
- ±2.5% System AccuracyWDu嘉泰姆
Integrated 50mΩ P-Channel Power MOSFET andWDu嘉泰姆
20mΩ N-Channel Power MOSFETWDu嘉泰姆
High Efficiency up to 95%WDu嘉泰姆
Current-Mode OperationWDu嘉泰姆
- Stable with Ceramic Output CapacitorsWDu嘉泰姆
- Fast Transient ResponseWDu嘉泰姆
Power-On-Reset MonitoringWDu嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModeWDu嘉泰姆
Automatic Pulse-Skipping Mode (PSM)/PWMWDu嘉泰姆
Mode OperationWDu嘉泰姆
Built-in Digital Soft-StartWDu嘉泰姆
Output Current-Limit Protection with FrequencyWDu嘉泰姆
FoldbackWDu嘉泰姆
·70% Under-Voltage ProtectionWDu嘉泰姆
·Over-Temperature ProtectionWDu嘉泰姆
·118% Over-Voltage ProtectionWDu嘉泰姆
·<5μA Quiescent Current During ShutdownWDu嘉泰姆
·Thermal-Enhanced TQFN5x6-28 PackageWDu嘉泰姆
·Pb-Free Available as an OptionWDu嘉泰姆
·Lead Free and Green Devices AvailableWDu嘉泰姆
(RoHS Compliant)WDu嘉泰姆
三,应用范围 (Applications)WDu嘉泰姆

LCD Monitor / TVWDu嘉泰姆

SetTop BoxWDu嘉泰姆
Portable DVDWDu嘉泰姆
Wireless LANWDu嘉泰姆
ADSL, Switch HUBWDu嘉泰姆
Notebook ComputerWDu嘉泰姆
Step-Down Converters Requiring High EfficiencyWDu嘉泰姆
and 5A Output CurrentWDu嘉泰姆

四.下载产品资料PDF文档 WDu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！WDu嘉泰姆

 WDu嘉泰姆

五,产品封装图 (Package)WDu嘉泰姆

WDu嘉泰姆

六.电路原理图WDu嘉泰姆

WDu嘉泰姆

七,功能概述WDu嘉泰姆

Inductor Value CalculationWDu嘉泰姆
The operating frequency and inductor selection are inter-related in that higher operating frequencies permitWDu嘉泰姆

the use of a smaller inductor for the same amount of inductor ripple current. However, this is at the expenseWDu嘉泰姆

 of efficiency due to an increase in MOSFET gate charge losses. The equation (2) shows that the inductanceWDu嘉泰姆

value has a direct effect on ripple current.Accepting larger values of ripple current allows the use of lowWDu嘉泰姆

 inductances, but results in higher output voltage rippleWDu嘉泰姆
Layout ConsiderationWDu嘉泰姆
In high power switching regulator, a correct layout is im-portant to ensure proper operation of the regulator.WDu嘉泰姆

In general, interconnecting impedance should be minimized by using short, wide printed circuit traces. SignalWDu嘉泰姆

 and power grounds are to be kept separating and finally com-bined using ground plane construction or singleWDu嘉泰姆

 point grounding. Figure 2 illustrates the layout, with bold lines indicating high current paths. ComponentsWDu嘉泰姆

 along the bold lines should be placed close together. The following is a checklist for your layout:WDu嘉泰姆
1. Firstly, to initial the layout by placing the power components. Orient the power circuitry to achieve a cleanWDu嘉泰姆
power flow path. If possible, make all the connections on one side of the PCB with wide, copper filled areas.WDu嘉泰姆
2. In Figure 2, the loops with the same color bold lines conduct high slew rate current. These interconnectingWDu嘉泰姆
impedances should be minimized by using wide, short printed circuit traces.WDu嘉泰姆
3. Keep the sensitive small signal nodes (FB, COMP) away from switching nodes (LX or others) on the PCB.WDu嘉泰姆
Therefore, place the feedback divider and the feedback compensation network close to the IC to avoid switchingWDu嘉泰姆
noise. Connect the ground of feedback divider directly to the GND pin of the IC using a dedicated ground trace.WDu嘉泰姆
4. The VCC decoupling capacitor should be right next to the VCC and GND pins. Capacitor C2 should be connectedWDu嘉泰姆
as close to the VIN and UGND pins as possible.WDu嘉泰姆
5. Place the decoupling ceramic capacitor C1 near the VIN as close as possible. The bulk capacitors C8 are alsoWDu嘉泰姆
placed near VIN. Use a wide power ground plane to con- nect the C1, C8, and C4 to provide a low impedanceWDu嘉泰姆
八,相关产品                 更多同类产品.......WDu嘉泰姆

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