CXSD61054 fully in tegrated , high-efficiency 2.0A synchronous rectified step-down converter hi

目录Ic9嘉泰姆

1.产品概述                       2.产品特点Ic9嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 Ic9嘉泰姆
5.产品封装图                     6.电路原理图                   Ic9嘉泰姆
7.功能概述                        8.相关产品Ic9嘉泰姆

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一,产品概述(General Description)      Ic9嘉泰姆

     The CXSD61054 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054 operates at high efficiencyIc9嘉泰姆
over a wide output current load range.Ic9嘉泰姆

      This device offers two operation modes,PWM control and PFM ModeIc9嘉泰姆
switching control, which allows a high efficiency over the wider range of theIc9嘉泰姆
load.The  rber of readily available standard external components and isIc9嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.Ic9嘉泰姆

二.产品特点(Features)Ic9嘉泰姆

* High Efficiency: Up to 95%Ic9嘉泰姆
* 600KHz Frequency OperationIc9嘉泰姆
* 2.0A Output CurrentIc9嘉泰姆
* No Schottky Diode RequiredIc9嘉泰姆
* 3.5V to 18V Input Voltage RangeIc9嘉泰姆
* 0.6V ReferenceIc9嘉泰姆
 Slope Compensated Current ModeIc9嘉泰姆
 Control for Excellent Line and LoadIc9嘉泰姆
 Transient ResponseIc9嘉泰姆
* Integrated internal compensationIc9嘉泰姆
* Stable with Low ESR Ceramic OutputIc9嘉泰姆
   CapacitorsIc9嘉泰姆
* Over Current Protection withIc9嘉泰姆
    Hiccup-ModeIc9嘉泰姆
* Input over voltage protection(OVP)Ic9嘉泰姆
*  Thermal ShutdownIc9嘉泰姆
*  Inrush Current Limit and Soft StartIc9嘉泰姆
*  Available in SOT23-6 PackageIc9嘉泰姆
*  -40°C to +85°C Temperature RangeIc9嘉泰姆
三,应用范围 (Applications)Ic9嘉泰姆

Distributed Power SystemsIc9嘉泰姆
Digital Set Top BoxesIc9嘉泰姆
Flat Panel Television and MonitorsIc9嘉泰姆
Wireless and DSL ModemsIc9嘉泰姆
Notebook ComputerIc9嘉泰姆
四.技术规格书下载（产品PDF）Ic9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！Ic9嘉泰姆

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五,产品封装图 (Package)Ic9嘉泰姆

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六.电路原理图Ic9嘉泰姆

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七,功能概述Ic9嘉泰姆

Internal Regulator Ic9嘉泰姆
The CXSD61054 is a current mode step down DC/DC converter that provides excellentIc9嘉泰姆
transient response with no extra external compensation components. This device containsIc9嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600KIc9嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DCIc9嘉泰姆
performance.Ic9嘉泰姆

Error AmplifierIc9嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andIc9嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenIc9嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,Ic9嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationIc9嘉泰姆
network minimizes the external component counts and simplifies the control loop design. Ic9嘉泰姆
Internal Soft-StartIc9嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingIc9嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)Ic9嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSIc9嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanIc9嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.Ic9嘉泰姆
Over-Current-Protection and HiccupIc9嘉泰姆
The CXSD61054 has cycle-by-cycle over current limit when the inductor current peak valueIc9嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB isIc9嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV isIc9嘉泰姆
triggered, the CXSD61054 enters hiccup mode to periodically restart the part. ThisIc9嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averageIc9嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect theIc9嘉泰姆
regulator. The CXSD61054 exits the hiccup mode once the over current condition isIc9嘉泰姆
removed. Ic9嘉泰姆
Startup and Shutdown Ic9嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. TheIc9嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then theIc9嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingIc9嘉泰姆
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