目录iWe嘉泰姆

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

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

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

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

二.产品特点(Features)iWe嘉泰姆

* High Efficiency: Up to 95%iWe嘉泰姆
* 600KHz Frequency OperationiWe嘉泰姆
* 2.0A Output CurrentiWe嘉泰姆
* No Schottky Diode RequirediWe嘉泰姆
* 3.5V to 18V Input Voltage RangeiWe嘉泰姆
* 0.6V ReferenceiWe嘉泰姆
 Slope Compensated Current ModeiWe嘉泰姆
 Control for Excellent Line and LoadiWe嘉泰姆
 Transient ResponseiWe嘉泰姆
* Integrated internal compensationiWe嘉泰姆
* Stable with Low ESR Ceramic OutputiWe嘉泰姆
   CapacitorsiWe嘉泰姆
* Over Current Protection withiWe嘉泰姆
    Hiccup-ModeiWe嘉泰姆
* Input over voltage protection(OVP)iWe嘉泰姆
*  Thermal ShutdowniWe嘉泰姆
*  Inrush Current Limit and Soft StartiWe嘉泰姆
*  Available in SOT23-6 PackageiWe嘉泰姆
*  -40°C to +85°C Temperature RangeiWe嘉泰姆
三,应用范围 (Applications)iWe嘉泰姆

Distributed Power SystemsiWe嘉泰姆
Digital Set Top BoxesiWe嘉泰姆
Flat Panel Television and MonitorsiWe嘉泰姆
Wireless and DSL ModemsiWe嘉泰姆
Notebook ComputeriWe嘉泰姆
四.技术规格书下载（产品PDF）iWe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！iWe嘉泰姆

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五,产品封装图 (Package)iWe嘉泰姆

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六.电路原理图iWe嘉泰姆
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七,功能概述iWe嘉泰姆

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

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

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