CXSD61055 is a fully integrated, high– efficiency 2A synchronous rectified step-down converter.CXSD61055 operates at high efficiency over a wide output current load range. This device offers two

目录73k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73k嘉泰姆

一,产品概述(General Description)         73k嘉泰姆

    The CXSD61055 is a fully integrated, high– efficiency 2A synchronous rectified step-down converter.The CXSD61055 operates at high efficiency over a wide output current load range.
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 CXSD61055 requires a minimum number of readily available standard external
components and is available in an 6-pin SOT23 ROHS compliant package.
二</span>.产品特点(Features)73k嘉泰姆

1.)High Efficiency: Up to 96%
2.)600KHz Frequency Operation
3.)2A Output Current
4.)No Schottky Diode Required
5.)4.5V to 16V Input Voltage Range
6.)0.6V Reference
7.)Slope Compensated Current Mode Control for
     Excellent Line and Load Transient Response
8.)Integrated internal compensation
9.)Stable with Low ESR Ceramic Output Capacitors
10.)Over Current Protection with Hiccup-Mode
11.)Thermal Shutdown
12.)Inrush Current Limit and Soft Start
13.)Available in SOT23-6 Package
14.)-40°C to +85°C Temperature Range
三</span>,应用范围 (Applications)73k嘉泰姆

Distributed Power Systems
Digital Set Top Boxes
Flat Panel Television and Monitors
Wireless and DSL Modems
Notebook Computer
四.下载产品资料PDF文档 73k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>
73k嘉泰姆

五</span>,产品封装图 (Package)

73k嘉泰姆

六</span>.电路原理图</span>

七</span>,功能概述73k嘉泰姆

Internal Regulator
    The CXSD61055 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. 
Error Amplifier
The error amplifier compares the FB pin voltage with the internal FB reference (V FB) 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 CXSD61055 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 CXSD61055 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 CXSD61055
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
circuitries. Three events can shut down the chip: EN low, VIN low and thermal shutdown. In the
shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMP
voltage and the internal supply rail are then pulled down. The floating driver is not subject to
this shutdown command.
八,相关产品                     更多同类产品......73k嘉泰姆