目录ukx嘉泰姆

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

 ukx嘉泰姆

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

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

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

二.产品特点(Features)ukx嘉泰姆

* High Efficiency: Up to 95%ukx嘉泰姆
* 600KHz Frequency Operationukx嘉泰姆
* 2.0A Output Currentukx嘉泰姆
* No Schottky Diode Requiredukx嘉泰姆
* 3.5V to 18V Input Voltage Rangeukx嘉泰姆
* 0.6V Referenceukx嘉泰姆
 Slope Compensated Current Modeukx嘉泰姆
 Control for Excellent Line and Loadukx嘉泰姆
 Transient Responseukx嘉泰姆
* Integrated internal compensationukx嘉泰姆
* Stable with Low ESR Ceramic Outputukx嘉泰姆
   Capacitorsukx嘉泰姆
* Over Current Protection withukx嘉泰姆
    Hiccup-Modeukx嘉泰姆
* Input over voltage protection(OVP)ukx嘉泰姆
*  Thermal Shutdownukx嘉泰姆
*  Inrush Current Limit and Soft Startukx嘉泰姆
*  Available in SOT23-6 Packageukx嘉泰姆
*  -40°C to +85°C Temperature Rangeukx嘉泰姆
三,应用范围 (Applications)ukx嘉泰姆

Distributed Power Systemsukx嘉泰姆
Digital Set Top Boxesukx嘉泰姆
Flat Panel Television and Monitorsukx嘉泰姆
Wireless and DSL Modemsukx嘉泰姆
Notebook Computerukx嘉泰姆
四.技术规格书下载（产品PDF）ukx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！ukx嘉泰姆

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五,产品封装图 (Package)ukx嘉泰姆

ukx嘉泰姆
六.电路原理图ukx嘉泰姆
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七,功能概述ukx嘉泰姆

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

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