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

目录eLf嘉泰姆

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

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

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

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

二.产品特点(Features)eLf嘉泰姆

* High Efficiency: Up to 95%eLf嘉泰姆
* 600KHz Frequency OperationeLf嘉泰姆
* 2.0A Output CurrenteLf嘉泰姆
* No Schottky Diode RequiredeLf嘉泰姆
* 3.5V to 18V Input Voltage RangeeLf嘉泰姆
* 0.6V ReferenceeLf嘉泰姆
 Slope Compensated Current ModeeLf嘉泰姆
 Control for Excellent Line and LoadeLf嘉泰姆
 Transient ResponseeLf嘉泰姆
* Integrated internal compensationeLf嘉泰姆
* Stable with Low ESR Ceramic OutputeLf嘉泰姆
   CapacitorseLf嘉泰姆
* Over Current Protection witheLf嘉泰姆
    Hiccup-ModeeLf嘉泰姆
* Input over voltage protection(OVP)eLf嘉泰姆
*  Thermal ShutdowneLf嘉泰姆
*  Inrush Current Limit and Soft StarteLf嘉泰姆
*  Available in SOT23-6 PackageeLf嘉泰姆
*  -40°C to +85°C Temperature RangeeLf嘉泰姆
三,应用范围 (Applications)eLf嘉泰姆

Distributed Power SystemseLf嘉泰姆
Digital Set Top BoxeseLf嘉泰姆
Flat Panel Television and MonitorseLf嘉泰姆
Wireless and DSL ModemseLf嘉泰姆
Notebook ComputereLf嘉泰姆
四.技术规格书下载（产品PDF）eLf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！eLf嘉泰姆

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五,产品封装图 (Package)eLf嘉泰姆

eLf嘉泰姆
六.电路原理图eLf嘉泰姆
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七,功能概述eLf嘉泰姆

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

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