目录QNQ嘉泰姆

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

 QNQ嘉泰姆

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

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

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

二.产品特点(Features)QNQ嘉泰姆

* High Efficiency: Up to 95%QNQ嘉泰姆
* 600KHz Frequency OperationQNQ嘉泰姆
* 2.0A Output CurrentQNQ嘉泰姆
* No Schottky Diode RequiredQNQ嘉泰姆
* 3.5V to 18V Input Voltage RangeQNQ嘉泰姆
* 0.6V ReferenceQNQ嘉泰姆
 Slope Compensated Current ModeQNQ嘉泰姆
 Control for Excellent Line and LoadQNQ嘉泰姆
 Transient ResponseQNQ嘉泰姆
* Integrated internal compensationQNQ嘉泰姆
* Stable with Low ESR Ceramic OutputQNQ嘉泰姆
   CapacitorsQNQ嘉泰姆
* Over Current Protection withQNQ嘉泰姆
    Hiccup-ModeQNQ嘉泰姆
* Input over voltage protection(OVP)QNQ嘉泰姆
*  Thermal ShutdownQNQ嘉泰姆
*  Inrush Current Limit and Soft StartQNQ嘉泰姆
*  Available in SOT23-6 PackageQNQ嘉泰姆
*  -40°C to +85°C Temperature RangeQNQ嘉泰姆
三,应用范围 (Applications)QNQ嘉泰姆

Distributed Power SystemsQNQ嘉泰姆
Digital Set Top BoxesQNQ嘉泰姆
Flat Panel Television and MonitorsQNQ嘉泰姆
Wireless and DSL ModemsQNQ嘉泰姆
Notebook ComputerQNQ嘉泰姆
四.技术规格书下载（产品PDF）QNQ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！QNQ嘉泰姆

 QNQ嘉泰姆

五,产品封装图 (Package)QNQ嘉泰姆

QNQ嘉泰姆
六.电路原理图QNQ嘉泰姆

QNQ嘉泰姆
QNQ嘉泰姆
七,功能概述QNQ嘉泰姆

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

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

共有条评论 用户名: 密码: 验证码: 匿名发表