目录85o嘉泰姆

1.产品概述                       2.产品特点85o嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 85o嘉泰姆
5.产品封装图                     6.电路原理图                   85o嘉泰姆
7.功能概述                        8.相关产品85o嘉泰姆

一,产品概述(General Description)         85o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.85o嘉泰姆
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.85o嘉泰姆
    The CXSD61055 requires a minimum number of readily available standard external85o嘉泰姆
components and is available in an 6-pin SOT23 ROHS compliant package.85o嘉泰姆
二.产品特点(Features)85o嘉泰姆

1.)High Efficiency: Up to 96%85o嘉泰姆
2.)600KHz Frequency Operation85o嘉泰姆
3.)2A Output Current85o嘉泰姆
4.)No Schottky Diode Required85o嘉泰姆
5.)4.5V to 16V Input Voltage Range85o嘉泰姆
6.)0.6V Reference85o嘉泰姆
7.)Slope Compensated Current Mode Control for85o嘉泰姆
     Excellent Line and Load Transient Response85o嘉泰姆
8.)Integrated internal compensation85o嘉泰姆
9.)Stable with Low ESR Ceramic Output Capacitors85o嘉泰姆
10.)Over Current Protection with Hiccup-Mode85o嘉泰姆
11.)Thermal Shutdown85o嘉泰姆
12.)Inrush Current Limit and Soft Start85o嘉泰姆
13.)Available in SOT23-6 Package85o嘉泰姆
14.)-40°C to +85°C Temperature Range85o嘉泰姆
三,应用范围 (Applications)85o嘉泰姆

Distributed Power Systems85o嘉泰姆
Digital Set Top Boxes85o嘉泰姆
Flat Panel Television and Monitors85o嘉泰姆
Wireless and DSL Modems85o嘉泰姆
Notebook Computer85o嘉泰姆
四.下载产品资料PDF文档 85o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！85o嘉泰姆

 85o嘉泰姆

五,产品封装图 (Package)85o嘉泰姆
85o嘉泰姆

六.电路原理图85o嘉泰姆
85o嘉泰姆
七,功能概述85o嘉泰姆

Internal Regulator85o嘉泰姆
    The CXSD61055 is a current mode step down DC/DC converter that provides excellent transient85o嘉泰姆
response with no extra external compensation components. This device contains an internal,85o嘉泰姆
low resistance, high voltage power MOSFET, and operates at a high 600K operating frequency to85o嘉泰姆
ensure a compact, high efficiency design with excellent AC and DC performance. 85o嘉泰姆
Error Amplifier85o嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (V FB) and outputs a85o嘉泰姆
current proportional to the difference between the two. This output current is then used to charge85o嘉泰姆
or discharge the internal compensation network to form the COMP voltage, which is used to85o嘉泰姆
control the power MOSFET current.The optimized internal compensation network minimizes the85o嘉泰姆
external component counts and simplifies the control loop design. 85o嘉泰姆
Internal Soft-Start85o嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshooting85o嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)85o嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SS overrides85o嘉泰姆
REF so the error amplifier uses SS as the reference. When SS is higher than REF, REF85o嘉泰姆
regains control. The SS time is internally fixed to 1 ms. Over-Current-Protection and Hiccup85o嘉泰姆
The CXSD61055 has cycle-by-cycle over current limit when the inductor current peak value85o嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB85o嘉泰姆
is below the Under-Voltage (UV) threshold,typically 30% below the reference. Once a UV is85o嘉泰姆
triggered, the CXSD61055 enters hiccup mode to periodically restart the part. This protection mode85o嘉泰姆
is especially useful when the output is dead-short to ground. The average short circuit85o嘉泰姆
current is greatly reduced to alleviate the thermal issue and to protect the regulator. The CXSD6105585o嘉泰姆
exits the hiccup mode once the over current condition is removed. 85o嘉泰姆
Startup and Shutdown85o嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. The85o嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then the85o嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remaining85o嘉泰姆
circuitries. Three events can shut down the chip: EN low, VIN low and thermal shutdown. In the85o嘉泰姆
shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMP85o嘉泰姆
voltage and the internal supply rail are then pulled down. The floating driver is not subject to85o嘉泰姆
this shutdown command.85o嘉泰姆
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