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

目录zzP嘉泰姆

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

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

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

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

二.产品特点(Features)zzP嘉泰姆

* High Efficiency: Up to 95%zzP嘉泰姆
* 600KHz Frequency OperationzzP嘉泰姆
* 2.0A Output CurrentzzP嘉泰姆
* No Schottky Diode RequiredzzP嘉泰姆
* 3.5V to 18V Input Voltage RangezzP嘉泰姆
* 0.6V ReferencezzP嘉泰姆
 Slope Compensated Current ModezzP嘉泰姆
 Control for Excellent Line and LoadzzP嘉泰姆
 Transient ResponsezzP嘉泰姆
* Integrated internal compensationzzP嘉泰姆
* Stable with Low ESR Ceramic OutputzzP嘉泰姆
   CapacitorszzP嘉泰姆
* Over Current Protection withzzP嘉泰姆
    Hiccup-ModezzP嘉泰姆
* Input over voltage protection(OVP)zzP嘉泰姆
*  Thermal ShutdownzzP嘉泰姆
*  Inrush Current Limit and Soft StartzzP嘉泰姆
*  Available in SOT23-6 PackagezzP嘉泰姆
*  -40°C to +85°C Temperature RangezzP嘉泰姆
三,应用范围 (Applications)zzP嘉泰姆

Distributed Power SystemszzP嘉泰姆
Digital Set Top BoxeszzP嘉泰姆
Flat Panel Television and MonitorszzP嘉泰姆
Wireless and DSL ModemszzP嘉泰姆
Notebook ComputerzzP嘉泰姆
四.技术规格书下载（产品PDF）zzP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！zzP嘉泰姆

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五,产品封装图 (Package)zzP嘉泰姆

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六.电路原理图zzP嘉泰姆
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七,功能概述zzP嘉泰姆

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

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