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

目录DMp嘉泰姆

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

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

     The JTM2234 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The JTM2234 operates at high efficiency
over a wide output current load range.
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      This device offers two operation modes,PWM control and PFM Mode
switching control, which allows a high efficiency over the wider range of the
load.The  rber of readily available standard external components and is
available in an 6-pin SOT23 ROHS compliant package.DMp嘉泰姆

二</span>.产品特点(Features)DMp嘉泰姆

* High Efficiency: Up to 95%
* 600KHz Frequency Operation
* 2.0A Output Current
* No Schottky Diode Required
* 3.5V to 18V Input Voltage Range
* 0.6V Reference
 Slope Compensated Current Mode
 Control for Excellent Line and Load
 Transient Response
* Integrated internal compensation
* Stable with Low ESR Ceramic Output
   Capacitors
* Over Current Protection with
    Hiccup-Mode
* Input over voltage protection(OVP)
*  Thermal Shutdown
*  Inrush Current Limit and Soft Start
*  Available in SOT23-6 Package
*  -40°C to +85°C Temperature Range
三</span>,应用范围 (Applications)DMp嘉泰姆

Distributed Power Systems
Digital Set Top Boxes
Flat Panel Television and Monitors
Wireless and DSL Modems
Notebook Computer
四.技术</span>规格书下载（产品PDF）</span>DMp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</span>！</span>
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五,产品封装图 (Package)DMp嘉泰姆

六.电路原理图</span>

七</span>,功能概述DMp嘉泰姆

Internal Regulator 
The JTM2234 is a current mode step down DC/DC converter that provides excellent
transient response with no extra external compensation components. This device contains
an internal, low resistance, high voltage power MOSFET, and operates at a high 600K
operating frequency to ensure a compact, high efficiency design with excellent AC and DC
performance.DMp嘉泰姆

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