目录uu8嘉泰姆

1.产品概述                       2.产品特点uu8嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 uu8嘉泰姆
5.产品封装图                     6.电路原理图                   uu8嘉泰姆
7.功能概述                        8.相关产品uu8嘉泰姆

 uu8嘉泰姆

一,产品概述(General Description)      uu8嘉泰姆

     The CXSD61054   is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054   operates at high efficiencyuu8嘉泰姆
over a wide output current load range.uu8嘉泰姆

      This device offers two operation modes,PWM control and PFM Modeuu8嘉泰姆
switching control, which allows a high efficiency over the wider range of theuu8嘉泰姆
load.The  rber of readily available standard external components and isuu8嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.uu8嘉泰姆

二.产品特点(Features)uu8嘉泰姆

* High Efficiency: Up to 95%uu8嘉泰姆
* 600KHz Frequency Operationuu8嘉泰姆
* 2.0A Output Currentuu8嘉泰姆
* No Schottky Diode Requireduu8嘉泰姆
* 3.5V to 18V Input Voltage Rangeuu8嘉泰姆
* 0.6V Referenceuu8嘉泰姆
 Slope Compensated Current Modeuu8嘉泰姆
 Control for Excellent Line and Loaduu8嘉泰姆
 Transient Responseuu8嘉泰姆
* Integrated internal compensationuu8嘉泰姆
* Stable with Low ESR Ceramic Outputuu8嘉泰姆
   Capacitorsuu8嘉泰姆
* Over Current Protection withuu8嘉泰姆
    Hiccup-Modeuu8嘉泰姆
* Input over voltage protection(OVP)uu8嘉泰姆
*  Thermal Shutdownuu8嘉泰姆
*  Inrush Current Limit and Soft Startuu8嘉泰姆
*  Available in SOT23-6 Packageuu8嘉泰姆
*  -40°C to +85°C Temperature Rangeuu8嘉泰姆
三,应用范围 (Applications)uu8嘉泰姆

Distributed Power Systemsuu8嘉泰姆
Digital Set Top Boxesuu8嘉泰姆
Flat Panel Television and Monitorsuu8嘉泰姆
Wireless and DSL Modemsuu8嘉泰姆
Notebook Computeruu8嘉泰姆
四.技术规格书下载（产品PDF）uu8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！uu8嘉泰姆

 uu8嘉泰姆

五,产品封装图 (Package)uu8嘉泰姆

uu8嘉泰姆
六.电路原理图uu8嘉泰姆
uu8嘉泰姆
七,功能概述uu8嘉泰姆

Internal Regulator uu8嘉泰姆
The CXSD61054   is a current mode step down DC/DC converter that provides excellentuu8嘉泰姆
transient response with no extra external compensation components. This device containsuu8嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600Kuu8嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DCuu8嘉泰姆
performance.uu8嘉泰姆

Error Amplifieruu8嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) anduu8嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenuu8嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,uu8嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationuu8嘉泰姆
network minimizes the external component counts and simplifies the control loop design. uu8嘉泰姆
Internal Soft-Startuu8嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootinguu8嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)uu8嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSuu8嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanuu8嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.uu8嘉泰姆
Over-Current-Protection and Hiccupuu8嘉泰姆
The JTM2234 has cycle-by-cycle over current limit when the inductor current peak valueuu8嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB isuu8嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV isuu8嘉泰姆
triggered, the JTM2234 enters hiccup mode to periodically restart the part. Thisuu8嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averageuu8嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect theuu8嘉泰姆
regulator. The JTM2234 exits the hiccup mode once the over current condition isuu8嘉泰姆
removed. uu8嘉泰姆
Startup and Shutdown uu8嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. Theuu8嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then theuu8嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remaininguu8嘉泰姆
八,相关芯片选择指南               更多同类产品......uu8嘉泰姆