目录w8O嘉泰姆

1.产品概述                       2.产品特点w8O嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 w8O嘉泰姆
5.产品封装图                     6.电路原理图                   w8O嘉泰姆
7.功能概述                        8.相关产品w8O嘉泰姆

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一,产品概述(General Description)      w8O嘉泰姆

     The CXSD61054 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054 operates at high efficiencyw8O嘉泰姆
over a wide output current load range.w8O嘉泰姆

      This device offers two operation modes,PWM control and PFM Modew8O嘉泰姆
switching control, which allows a high efficiency over the wider range of thew8O嘉泰姆
load.The  rber of readily available standard external components and isw8O嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.w8O嘉泰姆

二.产品特点(Features)w8O嘉泰姆

* High Efficiency: Up to 95%w8O嘉泰姆
* 600KHz Frequency Operationw8O嘉泰姆
* 2.0A Output Currentw8O嘉泰姆
* No Schottky Diode Requiredw8O嘉泰姆
* 3.5V to 18V Input Voltage Rangew8O嘉泰姆
* 0.6V Referencew8O嘉泰姆
 Slope Compensated Current Modew8O嘉泰姆
 Control for Excellent Line and Loadw8O嘉泰姆
 Transient Responsew8O嘉泰姆
* Integrated internal compensationw8O嘉泰姆
* Stable with Low ESR Ceramic Outputw8O嘉泰姆
   Capacitorsw8O嘉泰姆
* Over Current Protection withw8O嘉泰姆
    Hiccup-Modew8O嘉泰姆
* Input over voltage protection(OVP)w8O嘉泰姆
*  Thermal Shutdownw8O嘉泰姆
*  Inrush Current Limit and Soft Startw8O嘉泰姆
*  Available in SOT23-6 Packagew8O嘉泰姆
*  -40°C to +85°C Temperature Rangew8O嘉泰姆
三,应用范围 (Applications)w8O嘉泰姆

Distributed Power Systemsw8O嘉泰姆
Digital Set Top Boxesw8O嘉泰姆
Flat Panel Television and Monitorsw8O嘉泰姆
Wireless and DSL Modemsw8O嘉泰姆
Notebook Computerw8O嘉泰姆
四.技术规格书下载（产品PDF）w8O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！w8O嘉泰姆

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五,产品封装图 (Package)w8O嘉泰姆

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六.电路原理图w8O嘉泰姆

w8O嘉泰姆
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七,功能概述w8O嘉泰姆

Internal Regulator w8O嘉泰姆
The CXSD61054 is a current mode step down DC/DC converter that provides excellentw8O嘉泰姆
transient response with no extra external compensation components. This device containsw8O嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600Kw8O嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DCw8O嘉泰姆
performance.w8O嘉泰姆

Error Amplifierw8O嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andw8O嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenw8O嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,w8O嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationw8O嘉泰姆
network minimizes the external component counts and simplifies the control loop design. w8O嘉泰姆
Internal Soft-Startw8O嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingw8O嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)w8O嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSw8O嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanw8O嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.w8O嘉泰姆
Over-Current-Protection and Hiccupw8O嘉泰姆
The CXSD61054 has cycle-by-cycle over current limit when the inductor current peak valuew8O嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB isw8O嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV isw8O嘉泰姆
triggered, the CXSD61054 enters hiccup mode to periodically restart the part. Thisw8O嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averagew8O嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect thew8O嘉泰姆
regulator. The CXSD61054 exits the hiccup mode once the over current condition isw8O嘉泰姆
removed. w8O嘉泰姆
Startup and Shutdown w8O嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. Thew8O嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thew8O嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingw8O嘉泰姆
八,相关芯片选择指南               更多同类产品......w8O嘉泰姆

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