目录Nfa嘉泰姆

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

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

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

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

二.产品特点(Features)Nfa嘉泰姆

* High Efficiency: Up to 95%Nfa嘉泰姆
* 600KHz Frequency OperationNfa嘉泰姆
* 2.0A Output CurrentNfa嘉泰姆
* No Schottky Diode RequiredNfa嘉泰姆
* 3.5V to 18V Input Voltage RangeNfa嘉泰姆
* 0.6V ReferenceNfa嘉泰姆
 Slope Compensated Current ModeNfa嘉泰姆
 Control for Excellent Line and LoadNfa嘉泰姆
 Transient ResponseNfa嘉泰姆
* Integrated internal compensationNfa嘉泰姆
* Stable with Low ESR Ceramic OutputNfa嘉泰姆
   CapacitorsNfa嘉泰姆
* Over Current Protection withNfa嘉泰姆
    Hiccup-ModeNfa嘉泰姆
* Input over voltage protection(OVP)Nfa嘉泰姆
*  Thermal ShutdownNfa嘉泰姆
*  Inrush Current Limit and Soft StartNfa嘉泰姆
*  Available in SOT23-6 PackageNfa嘉泰姆
*  -40°C to +85°C Temperature RangeNfa嘉泰姆
三,应用范围 (Applications)Nfa嘉泰姆

Distributed Power SystemsNfa嘉泰姆
Digital Set Top BoxesNfa嘉泰姆
Flat Panel Television and MonitorsNfa嘉泰姆
Wireless and DSL ModemsNfa嘉泰姆
Notebook ComputerNfa嘉泰姆
四.技术规格书下载（产品PDF）Nfa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！Nfa嘉泰姆

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五,产品封装图 (Package)Nfa嘉泰姆

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

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

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

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