CXSD61020 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

目录usV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usV嘉泰姆

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一,产品概述(General Description)      usV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. usV嘉泰姆

       The CXSD61020 achieves higher efficiency  than  traditional  constant  current switching regulators by eliminating its associated power loss.
      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.
二</span>.产品特点(Features)usV嘉泰姆

10V to 36V Input Voltage
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40V Transparent Input Voltage Surge
Up to 3A Constant Output Current
Output Voltage Up to 15V
High efficiency: up to 92%
225KHz Switching Frequency Eases EMI Design
Integrated Sensor-less Constant Current (CC)Control
Resistor Programmable for Current Limit from1.5A to 3A
8% CC Accuracy
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三</span>,应用范围 (Applications)usV嘉泰姆

Car Charger/Adaptor
Rechargeable Portable Devices
General-Purpose CC/CV Supply
四.下载产品资料PDF文档 usV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</span>,产品封装图 (Package)
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六</span>.电路原理图</span>


七</span>,功能概述usV嘉泰姆

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