目录tPF嘉泰姆

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

一,产品概述(General Description)         tPF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.tPF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.tPF嘉泰姆
    The CXSD61055 requires a minimum number of readily available standard externaltPF嘉泰姆
components and is available in an 6-pin SOT23 ROHS compliant package.tPF嘉泰姆
二.产品特点(Features)tPF嘉泰姆

1.)High Efficiency: Up to 96%tPF嘉泰姆
2.)600KHz Frequency OperationtPF嘉泰姆
3.)2A Output CurrenttPF嘉泰姆
4.)No Schottky Diode RequiredtPF嘉泰姆
5.)4.5V to 16V Input Voltage RangetPF嘉泰姆
6.)0.6V ReferencetPF嘉泰姆
7.)Slope Compensated Current Mode Control fortPF嘉泰姆
     Excellent Line and Load Transient ResponsetPF嘉泰姆
8.)Integrated internal compensationtPF嘉泰姆
9.)Stable with Low ESR Ceramic Output CapacitorstPF嘉泰姆
10.)Over Current Protection with Hiccup-ModetPF嘉泰姆
11.)Thermal ShutdowntPF嘉泰姆
12.)Inrush Current Limit and Soft StarttPF嘉泰姆
13.)Available in SOT23-6 PackagetPF嘉泰姆
14.)-40°C to +85°C Temperature RangetPF嘉泰姆
三,应用范围 (Applications)tPF嘉泰姆

Distributed Power SystemstPF嘉泰姆
Digital Set Top BoxestPF嘉泰姆
Flat Panel Television and MonitorstPF嘉泰姆
Wireless and DSL ModemstPF嘉泰姆
Notebook ComputertPF嘉泰姆
四.下载产品资料PDF文档 tPF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！tPF嘉泰姆

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

tPF嘉泰姆
七,功能概述tPF嘉泰姆

Internal RegulatortPF嘉泰姆
    The CXSD61055 is a current mode step down DC/DC converter that provides excellent transienttPF嘉泰姆
response with no extra external compensation components. This device contains an internal,tPF嘉泰姆
low resistance, high voltage power MOSFET, and operates at a high 600K operating frequency totPF嘉泰姆
ensure a compact, high efficiency design with excellent AC and DC performance. tPF嘉泰姆
Error AmplifiertPF嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (V FB) and outputs atPF嘉泰姆
current proportional to the difference between the two. This output current is then used to chargetPF嘉泰姆
or discharge the internal compensation network to form the COMP voltage, which is used totPF嘉泰姆
control the power MOSFET current.The optimized internal compensation network minimizes thetPF嘉泰姆
external component counts and simplifies the control loop design. tPF嘉泰姆
Internal Soft-StarttPF嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingtPF嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)tPF嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SS overridestPF嘉泰姆
REF so the error amplifier uses SS as the reference. When SS is higher than REF, REFtPF嘉泰姆
regains control. The SS time is internally fixed to 1 ms. Over-Current-Protection and HiccuptPF嘉泰姆
The CXSD61055 has cycle-by-cycle over current limit when the inductor current peak valuetPF嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FBtPF嘉泰姆
is below the Under-Voltage (UV) threshold,typically 30% below the reference. Once a UV istPF嘉泰姆
triggered, the CXSD61055 enters hiccup mode to periodically restart the part. This protection modetPF嘉泰姆
is especially useful when the output is dead-short to ground. The average short circuittPF嘉泰姆
current is greatly reduced to alleviate the thermal issue and to protect the regulator. The CXSD61055tPF嘉泰姆
exits the hiccup mode once the over current condition is removed. tPF嘉泰姆
Startup and ShutdowntPF嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. ThetPF嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thetPF嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingtPF嘉泰姆
circuitries. Three events can shut down the chip: EN low, VIN low and thermal shutdown. In thetPF嘉泰姆
shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMPtPF嘉泰姆
voltage and the internal supply rail are then pulled down. The floating driver is not subject totPF嘉泰姆
this shutdown command.tPF嘉泰姆
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