目录zIG嘉泰姆

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

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

    The CXSD61055 is a fully integrated, high– efficiency 2A synchronous rectified step-down converter.The CXSD61055 operates at high efficiency over a wide output current load range.zIG嘉泰姆
This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load.zIG嘉泰姆
    The CXSD61055 requires a minimum number of readily available standard externalzIG嘉泰姆
components and is available in an 6-pin SOT23 ROHS compliant package.zIG嘉泰姆
二.产品特点(Features)zIG嘉泰姆

1.)High Efficiency: Up to 96%zIG嘉泰姆
2.)600KHz Frequency OperationzIG嘉泰姆
3.)2A Output CurrentzIG嘉泰姆
4.)No Schottky Diode RequiredzIG嘉泰姆
5.)4.5V to 16V Input Voltage RangezIG嘉泰姆
6.)0.6V ReferencezIG嘉泰姆
7.)Slope Compensated Current Mode Control forzIG嘉泰姆
     Excellent Line and Load Transient ResponsezIG嘉泰姆
8.)Integrated internal compensationzIG嘉泰姆
9.)Stable with Low ESR Ceramic Output CapacitorszIG嘉泰姆
10.)Over Current Protection with Hiccup-ModezIG嘉泰姆
11.)Thermal ShutdownzIG嘉泰姆
12.)Inrush Current Limit and Soft StartzIG嘉泰姆
13.)Available in SOT23-6 PackagezIG嘉泰姆
14.)-40°C to +85°C Temperature RangezIG嘉泰姆
三,应用范围 (Applications)zIG嘉泰姆

Distributed Power SystemszIG嘉泰姆
Digital Set Top BoxeszIG嘉泰姆
Flat Panel Television and MonitorszIG嘉泰姆
Wireless and DSL ModemszIG嘉泰姆
Notebook ComputerzIG嘉泰姆
四.下载产品资料PDF文档 zIG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！zIG嘉泰姆

 zIG嘉泰姆

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

zIG嘉泰姆
七,功能概述zIG嘉泰姆

Internal RegulatorzIG嘉泰姆
    The CXSD61055 is a current mode step down DC/DC converter that provides excellent transientzIG嘉泰姆
response with no extra external compensation components. This device contains an internal,zIG嘉泰姆
low resistance, high voltage power MOSFET, and operates at a high 600K operating frequency tozIG嘉泰姆
ensure a compact, high efficiency design with excellent AC and DC performance. zIG嘉泰姆
Error AmplifierzIG嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (V FB) and outputs azIG嘉泰姆
current proportional to the difference between the two. This output current is then used to chargezIG嘉泰姆
or discharge the internal compensation network to form the COMP voltage, which is used tozIG嘉泰姆
control the power MOSFET current.The optimized internal compensation network minimizes thezIG嘉泰姆
external component counts and simplifies the control loop design. zIG嘉泰姆
Internal Soft-StartzIG嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingzIG嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)zIG嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SS overrideszIG嘉泰姆
REF so the error amplifier uses SS as the reference. When SS is higher than REF, REFzIG嘉泰姆
regains control. The SS time is internally fixed to 1 ms. Over-Current-Protection and HiccupzIG嘉泰姆
The CXSD61055 has cycle-by-cycle over current limit when the inductor current peak valuezIG嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FBzIG嘉泰姆
is below the Under-Voltage (UV) threshold,typically 30% below the reference. Once a UV iszIG嘉泰姆
triggered, the CXSD61055 enters hiccup mode to periodically restart the part. This protection modezIG嘉泰姆
is especially useful when the output is dead-short to ground. The average short circuitzIG嘉泰姆
current is greatly reduced to alleviate the thermal issue and to protect the regulator. The CXSD61055zIG嘉泰姆
exits the hiccup mode once the over current condition is removed. zIG嘉泰姆
Startup and ShutdownzIG嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. ThezIG嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thezIG嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingzIG嘉泰姆
circuitries. Three events can shut down the chip: EN low, VIN low and thermal shutdown. In thezIG嘉泰姆
shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMPzIG嘉泰姆
voltage and the internal supply rail are then pulled down. The floating driver is not subject tozIG嘉泰姆
this shutdown command.zIG嘉泰姆
八,相关产品                     更多同类产品......zIG嘉泰姆