CXSD61055 4.5V to 16V Input Voltage Range Integrated internal compensation 2A Output Current Over C
发表时间:2020-04-09
浏览次数:6

目录Lgs嘉泰姆

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

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


1.)High Efficiency: Up to 96%Lgs嘉泰姆
2.)600KHz Frequency OperationLgs嘉泰姆
3.)2A Output CurrentLgs嘉泰姆
4.)No Schottky Diode RequiredLgs嘉泰姆
5.)4.5V to 16V Input Voltage RangeLgs嘉泰姆
6.)0.6V ReferenceLgs嘉泰姆
7.)Slope Compensated Current Mode Control forLgs嘉泰姆
     Excellent Line and Load Transient ResponseLgs嘉泰姆
8.)Integrated internal compensationLgs嘉泰姆
9.)Stable with Low ESR Ceramic Output CapacitorsLgs嘉泰姆
10.)Over Current Protection with Hiccup-ModeLgs嘉泰姆
11.)Thermal ShutdownLgs嘉泰姆
12.)Inrush Current Limit and Soft StartLgs嘉泰姆
13.)Available in SOT23-6 PackageLgs嘉泰姆
14.)-40°C to +85°C Temperature RangeLgs嘉泰姆
三,应用范围 (Applications)Lgs嘉泰姆


Distributed Power SystemsLgs嘉泰姆
Digital Set Top BoxesLgs嘉泰姆
Flat Panel Television and MonitorsLgs嘉泰姆
Wireless and DSL ModemsLgs嘉泰姆
Notebook ComputerLgs嘉泰姆
四.下载产品资料PDF文档 Lgs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Lgs嘉泰姆

 QQ截图20160419174301.jpgLgs嘉泰姆

五,产品封装图 (Package)Lgs嘉泰姆
Lgs嘉泰姆

Pin NameLgs嘉泰姆

Pin NumberLgs嘉泰姆

DescriptionLgs嘉泰姆

BSLgs嘉泰姆

1Lgs嘉泰姆

Bootstrap. A capacitor connected between SW and BS pins is requiredLgs嘉泰姆
to form a floating supply across the high-side switch driver.Lgs嘉泰姆

GNDLgs嘉泰姆

2Lgs嘉泰姆

Analog ground pin.Lgs嘉泰姆

FBLgs嘉泰姆

3Lgs嘉泰姆

Adjustable version feedback input. Connect FB to the center point of theLgs嘉泰姆
external resistor divider.Lgs嘉泰姆

ENLgs嘉泰姆

4Lgs嘉泰姆

Drive this pin to a logic-high to enable the IC. Drive to a logic-low toLgs嘉泰姆
disable the IC and enter micro-power shutdown mode.Lgs嘉泰姆

VINLgs嘉泰姆

5Lgs嘉泰姆

Power supply PinLgs嘉泰姆

SWLgs嘉泰姆

6Lgs嘉泰姆

Switching PinLgs嘉泰姆

六.电路原理图Lgs嘉泰姆
Lgs嘉泰姆
七,功能概述Lgs嘉泰姆


Internal RegulatorLgs嘉泰姆
    The CXSD61055 is a current mode step down DC/DC converter that provides excellent transientLgs嘉泰姆
response with no extra external compensation components. This device contains an internal,Lgs嘉泰姆
low resistance, high voltage power MOSFET, and operates at a high 600K operating frequency toLgs嘉泰姆
ensure a compact, high efficiency design with excellent AC and DC performance. Lgs嘉泰姆
Error AmplifierLgs嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (V FB) and outputs aLgs嘉泰姆
current proportional to the difference between the two. This output current is then used to chargeLgs嘉泰姆
or discharge the internal compensation network to form the COMP voltage, which is used toLgs嘉泰姆
control the power MOSFET current.The optimized internal compensation network minimizes theLgs嘉泰姆
external component counts and simplifies the control loop design. Lgs嘉泰姆
Internal Soft-StartLgs嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingLgs嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)Lgs嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SS overridesLgs嘉泰姆
REF so the error amplifier uses SS as the reference. When SS is higher than REF, REFLgs嘉泰姆
regains control. The SS time is internally fixed to 1 ms. Over-Current-Protection and HiccupLgs嘉泰姆
The CXSD61055 has cycle-by-cycle over current limit when the inductor current peak valueLgs嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FBLgs嘉泰姆
is below the Under-Voltage (UV) threshold,typically 30% below the reference. Once a UV isLgs嘉泰姆
triggered, the CXSD61055 enters hiccup mode to periodically restart the part. This protection modeLgs嘉泰姆
is especially useful when the output is dead-short to ground. The average short circuitLgs嘉泰姆
current is greatly reduced to alleviate the thermal issue and to protect the regulator. The CXSD61055Lgs嘉泰姆
exits the hiccup mode once the over current condition is removed. Lgs嘉泰姆
Startup and ShutdownLgs嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. TheLgs嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then theLgs嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingLgs嘉泰姆
circuitries. Three events can shut down the chip: EN low, VIN low and thermal shutdown. In theLgs嘉泰姆
shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMPLgs嘉泰姆
voltage and the internal supply rail are then pulled down. The floating driver is not subject toLgs嘉泰姆
this shutdown command.Lgs嘉泰姆
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