目录b20嘉泰姆

1.产品概述                       2.产品特点b20嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 b20嘉泰姆
5.产品封装图                     6.电路原理图                   b20嘉泰姆
7.功能概述                        8.相关产品b20嘉泰姆

 b20嘉泰姆

一,产品概述(General Description)      b20嘉泰姆

     The CXSD61054 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054 operates at high efficiencyb20嘉泰姆
over a wide output current load range.b20嘉泰姆

      This device offers two operation modes,PWM control and PFM Modeb20嘉泰姆
switching control, which allows a high efficiency over the wider range of theb20嘉泰姆
load.The  rber of readily available standard external components and isb20嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.b20嘉泰姆

二.产品特点(Features)b20嘉泰姆

* High Efficiency: Up to 95%b20嘉泰姆
* 600KHz Frequency Operationb20嘉泰姆
* 2.0A Output Currentb20嘉泰姆
* No Schottky Diode Requiredb20嘉泰姆
* 3.5V to 18V Input Voltage Rangeb20嘉泰姆
* 0.6V Referenceb20嘉泰姆
 Slope Compensated Current Modeb20嘉泰姆
 Control for Excellent Line and Loadb20嘉泰姆
 Transient Responseb20嘉泰姆
* Integrated internal compensationb20嘉泰姆
* Stable with Low ESR Ceramic Outputb20嘉泰姆
   Capacitorsb20嘉泰姆
* Over Current Protection withb20嘉泰姆
    Hiccup-Modeb20嘉泰姆
* Input over voltage protection(OVP)b20嘉泰姆
*  Thermal Shutdownb20嘉泰姆
*  Inrush Current Limit and Soft Startb20嘉泰姆
*  Available in SOT23-6 Packageb20嘉泰姆
*  -40°C to +85°C Temperature Rangeb20嘉泰姆
三,应用范围 (Applications)b20嘉泰姆

Distributed Power Systemsb20嘉泰姆
Digital Set Top Boxesb20嘉泰姆
Flat Panel Television and Monitorsb20嘉泰姆
Wireless and DSL Modemsb20嘉泰姆
Notebook Computerb20嘉泰姆
四.技术规格书下载（产品PDF）b20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！b20嘉泰姆

 b20嘉泰姆

五,产品封装图 (Package)b20嘉泰姆

b20嘉泰姆
六.电路原理图b20嘉泰姆

b20嘉泰姆
b20嘉泰姆
七,功能概述b20嘉泰姆

Internal Regulator b20嘉泰姆
The CXSD61054 is a current mode step down DC/DC converter that provides excellentb20嘉泰姆
transient response with no extra external compensation components. This device containsb20嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600Kb20嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DCb20嘉泰姆
performance.b20嘉泰姆

Error Amplifierb20嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andb20嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenb20嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,b20嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationb20嘉泰姆
network minimizes the external component counts and simplifies the control loop design. b20嘉泰姆
Internal Soft-Startb20嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingb20嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)b20嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSb20嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanb20嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.b20嘉泰姆
Over-Current-Protection and Hiccupb20嘉泰姆
The CXSD61054 has cycle-by-cycle over current limit when the inductor current peak valueb20嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB isb20嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV isb20嘉泰姆
triggered, the CXSD61054 enters hiccup mode to periodically restart the part. Thisb20嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averageb20嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect theb20嘉泰姆
regulator. The CXSD61054 exits the hiccup mode once the over current condition isb20嘉泰姆
removed. b20嘉泰姆
Startup and Shutdown b20嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. Theb20嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then theb20嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingb20嘉泰姆
八,相关芯片选择指南               更多同类产品......b20嘉泰姆

共有条评论 用户名: 密码: 验证码: 匿名发表