目录pKn嘉泰姆

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

 pKn嘉泰姆

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

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

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

二.产品特点(Features)pKn嘉泰姆

* High Efficiency: Up to 95%pKn嘉泰姆
* 600KHz Frequency OperationpKn嘉泰姆
* 2.0A Output CurrentpKn嘉泰姆
* No Schottky Diode RequiredpKn嘉泰姆
* 3.5V to 18V Input Voltage RangepKn嘉泰姆
* 0.6V ReferencepKn嘉泰姆
 Slope Compensated Current ModepKn嘉泰姆
 Control for Excellent Line and LoadpKn嘉泰姆
 Transient ResponsepKn嘉泰姆
* Integrated internal compensationpKn嘉泰姆
* Stable with Low ESR Ceramic OutputpKn嘉泰姆
   CapacitorspKn嘉泰姆
* Over Current Protection withpKn嘉泰姆
    Hiccup-ModepKn嘉泰姆
* Input over voltage protection(OVP)pKn嘉泰姆
*  Thermal ShutdownpKn嘉泰姆
*  Inrush Current Limit and Soft StartpKn嘉泰姆
*  Available in SOT23-6 PackagepKn嘉泰姆
*  -40°C to +85°C Temperature RangepKn嘉泰姆
三,应用范围 (Applications)pKn嘉泰姆

Distributed Power SystemspKn嘉泰姆
Digital Set Top BoxespKn嘉泰姆
Flat Panel Television and MonitorspKn嘉泰姆
Wireless and DSL ModemspKn嘉泰姆
Notebook ComputerpKn嘉泰姆
四.技术规格书下载（产品PDF）pKn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！pKn嘉泰姆

 pKn嘉泰姆

五,产品封装图 (Package)pKn嘉泰姆

pKn嘉泰姆
六.电路原理图pKn嘉泰姆
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七,功能概述pKn嘉泰姆

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

Error AmplifierpKn嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andpKn嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenpKn嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,pKn嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationpKn嘉泰姆
network minimizes the external component counts and simplifies the control loop design. pKn嘉泰姆
Internal Soft-StartpKn嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingpKn嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)pKn嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSpKn嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanpKn嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.pKn嘉泰姆
Over-Current-Protection and HiccuppKn嘉泰姆
The JTM2234 has cycle-by-cycle over current limit when the inductor current peak valuepKn嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB ispKn嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV ispKn嘉泰姆
triggered, the JTM2234 enters hiccup mode to periodically restart the part. ThispKn嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averagepKn嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect thepKn嘉泰姆
regulator. The JTM2234 exits the hiccup mode once the over current condition ispKn嘉泰姆
removed. pKn嘉泰姆
Startup and Shutdown pKn嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. ThepKn嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thepKn嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingpKn嘉泰姆
八,相关芯片选择指南               更多同类产品......pKn嘉泰姆

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