CXSD61055 4.5V to 16V Input Voltage Range Integrated internal compensation 2A Output Current Over C

目录ezn嘉泰姆

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

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

1.)High Efficiency: Up to 96%ezn嘉泰姆
2.)600KHz Frequency Operationezn嘉泰姆
3.)2A Output Currentezn嘉泰姆
4.)No Schottky Diode Requiredezn嘉泰姆
5.)4.5V to 16V Input Voltage Rangeezn嘉泰姆
6.)0.6V Referenceezn嘉泰姆
7.)Slope Compensated Current Mode Control forezn嘉泰姆
     Excellent Line and Load Transient Responseezn嘉泰姆
8.)Integrated internal compensationezn嘉泰姆
9.)Stable with Low ESR Ceramic Output Capacitorsezn嘉泰姆
10.)Over Current Protection with Hiccup-Modeezn嘉泰姆
11.)Thermal Shutdownezn嘉泰姆
12.)Inrush Current Limit and Soft Startezn嘉泰姆
13.)Available in SOT23-6 Packageezn嘉泰姆
14.)-40°C to +85°C Temperature Rangeezn嘉泰姆
三,应用范围 (Applications)ezn嘉泰姆

Distributed Power Systemsezn嘉泰姆
Digital Set Top Boxesezn嘉泰姆
Flat Panel Television and Monitorsezn嘉泰姆
Wireless and DSL Modemsezn嘉泰姆
Notebook Computerezn嘉泰姆
四.下载产品资料PDF文档 ezn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！ezn嘉泰姆

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五,产品封装图 (Package)ezn嘉泰姆
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六.电路原理图ezn嘉泰姆
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七,功能概述ezn嘉泰姆

Internal Regulatorezn嘉泰姆
    The CXSD61055 is a current mode step down DC/DC converter that provides excellent transientezn嘉泰姆
response with no extra external compensation components. This device contains an internal,ezn嘉泰姆
low resistance, high voltage power MOSFET, and operates at a high 600K operating frequency toezn嘉泰姆
ensure a compact, high efficiency design with excellent AC and DC performance. ezn嘉泰姆
Error Amplifierezn嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (V FB) and outputs aezn嘉泰姆
current proportional to the difference between the two. This output current is then used to chargeezn嘉泰姆
or discharge the internal compensation network to form the COMP voltage, which is used toezn嘉泰姆
control the power MOSFET current.The optimized internal compensation network minimizes theezn嘉泰姆
external component counts and simplifies the control loop design. ezn嘉泰姆
Internal Soft-Startezn嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingezn嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)ezn嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SS overridesezn嘉泰姆
REF so the error amplifier uses SS as the reference. When SS is higher than REF, REFezn嘉泰姆
regains control. The SS time is internally fixed to 1 ms. Over-Current-Protection and Hiccupezn嘉泰姆
The CXSD61055 has cycle-by-cycle over current limit when the inductor current peak valueezn嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FBezn嘉泰姆
is below the Under-Voltage (UV) threshold,typically 30% below the reference. Once a UV isezn嘉泰姆
triggered, the CXSD61055 enters hiccup mode to periodically restart the part. This protection modeezn嘉泰姆
is especially useful when the output is dead-short to ground. The average short circuitezn嘉泰姆
current is greatly reduced to alleviate the thermal issue and to protect the regulator. The CXSD61055ezn嘉泰姆
exits the hiccup mode once the over current condition is removed. ezn嘉泰姆
Startup and Shutdownezn嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. Theezn嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then theezn嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingezn嘉泰姆
circuitries. Three events can shut down the chip: EN low, VIN low and thermal shutdown. In theezn嘉泰姆
shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMPezn嘉泰姆
voltage and the internal supply rail are then pulled down. The floating driver is not subject toezn嘉泰姆
this shutdown command.ezn嘉泰姆
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