目录lxK嘉泰姆

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

 lxK嘉泰姆

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

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

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

二.产品特点(Features)lxK嘉泰姆

* High Efficiency: Up to 95%lxK嘉泰姆
* 600KHz Frequency OperationlxK嘉泰姆
* 2.0A Output CurrentlxK嘉泰姆
* No Schottky Diode RequiredlxK嘉泰姆
* 3.5V to 18V Input Voltage RangelxK嘉泰姆
* 0.6V ReferencelxK嘉泰姆
 Slope Compensated Current ModelxK嘉泰姆
 Control for Excellent Line and LoadlxK嘉泰姆
 Transient ResponselxK嘉泰姆
* Integrated internal compensationlxK嘉泰姆
* Stable with Low ESR Ceramic OutputlxK嘉泰姆
   CapacitorslxK嘉泰姆
* Over Current Protection withlxK嘉泰姆
    Hiccup-ModelxK嘉泰姆
* Input over voltage protection(OVP)lxK嘉泰姆
*  Thermal ShutdownlxK嘉泰姆
*  Inrush Current Limit and Soft StartlxK嘉泰姆
*  Available in SOT23-6 PackagelxK嘉泰姆
*  -40°C to +85°C Temperature RangelxK嘉泰姆
三,应用范围 (Applications)lxK嘉泰姆

Distributed Power SystemslxK嘉泰姆
Digital Set Top BoxeslxK嘉泰姆
Flat Panel Television and MonitorslxK嘉泰姆
Wireless and DSL ModemslxK嘉泰姆
Notebook ComputerlxK嘉泰姆
四.技术规格书下载（产品PDF）lxK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！lxK嘉泰姆

 lxK嘉泰姆

五,产品封装图 (Package)lxK嘉泰姆

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

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

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

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