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目录qnU嘉泰姆

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

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

    The CXSD61020 is a wide input voltage high-efficiency Step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. CXSD61020 provides up to 3A output current at 225-KHz switching frequency eases EMI design. Integrated sensor-less CC control scheme of the CXSD61020 eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. qnU嘉泰姆

       The CXSD61020 achieves higher efficiency  than  traditional  constant  current switching regulators by eliminating its associated power loss.qnU嘉泰姆
      Protection features include cycle-by-cycle current limit, thermal shut-down, and frequency foldback at shot circuit. The devices are available in a SOP-8EP package and require very few external devices for operation.qnU嘉泰姆
二.产品特点(Features)qnU嘉泰姆

10V to 36V Input VoltageqnU嘉泰姆

40V Transparent Input Voltage SurgeqnU嘉泰姆
Up to 3A Constant Output CurrentqnU嘉泰姆
Output Voltage Up to 15VqnU嘉泰姆
High efficiency: up to 92%qnU嘉泰姆
225KHz Switching Frequency Eases EMI DesignqnU嘉泰姆
Integrated Sensor-less Constant Current (CC)ControlqnU嘉泰姆
Resistor Programmable for Current Limit from1.5A to 3AqnU嘉泰姆
8% CC AccuracyqnU嘉泰姆

三,应用范围 (Applications)qnU嘉泰姆

Car Charger/AdaptorqnU嘉泰姆
Rechargeable Portable DevicesqnU嘉泰姆
General-Purpose CC/CV SupplyqnU嘉泰姆
四.下载产品资料PDF文档 qnU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！qnU嘉泰姆

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五,产品封装图 (Package)qnU嘉泰姆
qnU嘉泰姆

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

    As seen in Functional Block Diagram, the CXSD61020 is a peak current mode pulse width modulationqnU嘉泰姆
(PWM) converter with CC and CV control. The converter operates as follows: A switching cycleqnU嘉泰姆
starts when the rising edge of the Oscillator clock output causes the High-Side Power Switch to turnqnU嘉泰姆
on and the Low-Side Power Switch to turn off. With the SW side of the inductor now connected to IN,qnU嘉泰姆
the inductor current ramps up to store energy in the magnetic field. The inductor current level isqnU嘉泰姆
measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resultingqnU嘉泰姆
summation is higher than the COMP voltage, the output of the PWM Comparator goes high. WhenqnU嘉泰姆
this happens or when Oscillator clock output goes low, the High-Side Power Switch turns off. At thisqnU嘉泰姆
point, the SW side of the inductor swings to a diode voltage below ground, causing the inductor currentqnU嘉泰姆
to decrease and magnetic energy to be transferred to output. This state continues until the cycle startsqnU嘉泰姆
again. The High-Side Power Switch is driven by logic using HBS as the positive rail. This pin isqnU嘉泰姆
charged to VSW + 5V when the Low-Side Power Switch turns on. The COMP voltage is theqnU嘉泰姆
integration of the error between FB input and the nternal 0.8V reference voltage. If FB is lower thanqnU嘉泰姆
the reference voltage, COMP tends to go higher to increase current to the output. Output current willqnU嘉泰姆
increase until it reaches the CC limit set by the ISET resistor. At this point, the device will transitionqnU嘉泰姆
from regulating output voltage to regulating output current, and the output voltage will drop withqnU嘉泰姆
increasing load. The Oscillator normally switches at 225-KHz. However, if FB voltage is less than 0.6V,qnU嘉泰姆
then the switching frequency decreases until it reaches a typical value of 30kHz at VFB = 0.15V.qnU嘉泰姆
八,相关产品                更多同类产品......qnU嘉泰姆

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