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

目录fo9嘉泰姆

1.产品概述                       2.产品特点fo9嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 fo9嘉泰姆
5.产品封装图                     6.电路原理图                   fo9嘉泰姆
7.功能概述                        8.相关产品fo9嘉泰姆

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一,产品概述(General Description)      fo9嘉泰姆

     The CXSD61054   is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054   operates at high efficiencyfo9嘉泰姆
over a wide output current load range.fo9嘉泰姆

      This device offers two operation modes,PWM control and PFM Modefo9嘉泰姆
switching control, which allows a high efficiency over the wider range of thefo9嘉泰姆
load.The  rber of readily available standard external components and isfo9嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.fo9嘉泰姆

二.产品特点(Features)fo9嘉泰姆

* High Efficiency: Up to 95%fo9嘉泰姆
* 600KHz Frequency Operationfo9嘉泰姆
* 2.0A Output Currentfo9嘉泰姆
* No Schottky Diode Requiredfo9嘉泰姆
* 3.5V to 18V Input Voltage Rangefo9嘉泰姆
* 0.6V Referencefo9嘉泰姆
 Slope Compensated Current Modefo9嘉泰姆
 Control for Excellent Line and Loadfo9嘉泰姆
 Transient Responsefo9嘉泰姆
* Integrated internal compensationfo9嘉泰姆
* Stable with Low ESR Ceramic Outputfo9嘉泰姆
   Capacitorsfo9嘉泰姆
* Over Current Protection withfo9嘉泰姆
    Hiccup-Modefo9嘉泰姆
* Input over voltage protection(OVP)fo9嘉泰姆
*  Thermal Shutdownfo9嘉泰姆
*  Inrush Current Limit and Soft Startfo9嘉泰姆
*  Available in SOT23-6 Packagefo9嘉泰姆
*  -40°C to +85°C Temperature Rangefo9嘉泰姆
三,应用范围 (Applications)fo9嘉泰姆

Distributed Power Systemsfo9嘉泰姆
Digital Set Top Boxesfo9嘉泰姆
Flat Panel Television and Monitorsfo9嘉泰姆
Wireless and DSL Modemsfo9嘉泰姆
Notebook Computerfo9嘉泰姆
四.技术规格书下载（产品PDF）fo9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！fo9嘉泰姆

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五,产品封装图 (Package)fo9嘉泰姆

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六.电路原理图fo9嘉泰姆
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七,功能概述fo9嘉泰姆

Internal Regulator fo9嘉泰姆
The CXSD61054   is a current mode step down DC/DC converter that provides excellentfo9嘉泰姆
transient response with no extra external compensation components. This device containsfo9嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600Kfo9嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DCfo9嘉泰姆
performance.fo9嘉泰姆

Error Amplifierfo9嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andfo9嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenfo9嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,fo9嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationfo9嘉泰姆
network minimizes the external component counts and simplifies the control loop design. fo9嘉泰姆
Internal Soft-Startfo9嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingfo9嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)fo9嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSfo9嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanfo9嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.fo9嘉泰姆
Over-Current-Protection and Hiccupfo9嘉泰姆
The JTM2234 has cycle-by-cycle over current limit when the inductor current peak valuefo9嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB isfo9嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV isfo9嘉泰姆
triggered, the JTM2234 enters hiccup mode to periodically restart the part. Thisfo9嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averagefo9嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect thefo9嘉泰姆
regulator. The JTM2234 exits the hiccup mode once the over current condition isfo9嘉泰姆
removed. fo9嘉泰姆
Startup and Shutdown fo9嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. Thefo9嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thefo9嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingfo9嘉泰姆
八,相关芯片选择指南               更多同类产品......fo9嘉泰姆