CXSD61054 fully in tegrated , high-efficiency 2.0A synchronous rectified step-down converter high efficiency over a wide output current load range

目录rwH嘉泰姆

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

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

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

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

二.产品特点(Features)rwH嘉泰姆

* High Efficiency: Up to 95%rwH嘉泰姆
* 600KHz Frequency OperationrwH嘉泰姆
* 2.0A Output CurrentrwH嘉泰姆
* No Schottky Diode RequiredrwH嘉泰姆
* 3.5V to 18V Input Voltage RangerwH嘉泰姆
* 0.6V ReferencerwH嘉泰姆
 Slope Compensated Current ModerwH嘉泰姆
 Control for Excellent Line and LoadrwH嘉泰姆
 Transient ResponserwH嘉泰姆
* Integrated internal compensationrwH嘉泰姆
* Stable with Low ESR Ceramic OutputrwH嘉泰姆
   CapacitorsrwH嘉泰姆
* Over Current Protection withrwH嘉泰姆
    Hiccup-ModerwH嘉泰姆
* Input over voltage protection(OVP)rwH嘉泰姆
*  Thermal ShutdownrwH嘉泰姆
*  Inrush Current Limit and Soft StartrwH嘉泰姆
*  Available in SOT23-6 PackagerwH嘉泰姆
*  -40°C to +85°C Temperature RangerwH嘉泰姆
三,应用范围 (Applications)rwH嘉泰姆

Distributed Power SystemsrwH嘉泰姆
Digital Set Top BoxesrwH嘉泰姆
Flat Panel Television and MonitorsrwH嘉泰姆
Wireless and DSL ModemsrwH嘉泰姆
Notebook ComputerrwH嘉泰姆
四.技术规格书下载（产品PDF）rwH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！rwH嘉泰姆

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五,产品封装图 (Package)rwH嘉泰姆

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六.电路原理图rwH嘉泰姆
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七,功能概述rwH嘉泰姆

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

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