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

目录eCM嘉泰姆

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

 eCM嘉泰姆

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

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

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

二.产品特点(Features)eCM嘉泰姆

* High Efficiency: Up to 95%eCM嘉泰姆
* 600KHz Frequency OperationeCM嘉泰姆
* 2.0A Output CurrenteCM嘉泰姆
* No Schottky Diode RequiredeCM嘉泰姆
* 3.5V to 18V Input Voltage RangeeCM嘉泰姆
* 0.6V ReferenceeCM嘉泰姆
 Slope Compensated Current ModeeCM嘉泰姆
 Control for Excellent Line and LoadeCM嘉泰姆
 Transient ResponseeCM嘉泰姆
* Integrated internal compensationeCM嘉泰姆
* Stable with Low ESR Ceramic OutputeCM嘉泰姆
   CapacitorseCM嘉泰姆
* Over Current Protection witheCM嘉泰姆
    Hiccup-ModeeCM嘉泰姆
* Input over voltage protection(OVP)eCM嘉泰姆
*  Thermal ShutdowneCM嘉泰姆
*  Inrush Current Limit and Soft StarteCM嘉泰姆
*  Available in SOT23-6 PackageeCM嘉泰姆
*  -40°C to +85°C Temperature RangeeCM嘉泰姆
三,应用范围 (Applications)eCM嘉泰姆

Distributed Power SystemseCM嘉泰姆
Digital Set Top BoxeseCM嘉泰姆
Flat Panel Television and MonitorseCM嘉泰姆
Wireless and DSL ModemseCM嘉泰姆
Notebook ComputereCM嘉泰姆
四.技术规格书下载（产品PDF）eCM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！eCM嘉泰姆

 eCM嘉泰姆

五,产品封装图 (Package)eCM嘉泰姆

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

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

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