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CXSD61020 wide input voltage high-efficiency Step-down DC/DC converter that operates in either CV (C
发表时间:2020-04-08浏览次数:111
CXSD61020 wide input voltage high-efficiency Step-down DC/DC converter that operates in either CV (C
 

目录mLX嘉泰姆

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

 mLX嘉泰姆

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

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


10V to 36V Input VoltagemLX嘉泰姆

40V Transparent Input Voltage SurgemLX嘉泰姆
Up to 3A Constant Output CurrentmLX嘉泰姆
Output Voltage Up to 15VmLX嘉泰姆
High efficiency: up to 92%mLX嘉泰姆
225KHz Switching Frequency Eases EMI DesignmLX嘉泰姆
Integrated Sensor-less Constant Current (CC)ControlmLX嘉泰姆
Resistor Programmable for Current Limit from1.5A to 3AmLX嘉泰姆
8% CC AccuracymLX嘉泰姆

三,应用范围 (Applications)mLX嘉泰姆


Car Charger/AdaptormLX嘉泰姆
Rechargeable Portable DevicesmLX嘉泰姆
General-Purpose CC/CV SupplymLX嘉泰姆
四.下载产品资料PDF文档 mLX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mLX嘉泰姆

 QQ截图20160419174301.jpgmLX嘉泰姆

五,产品封装图 (Package)mLX嘉泰姆
blob.pngmLX嘉泰姆

PINmLX嘉泰姆
1mLX嘉泰姆

NAMEmLX嘉泰姆
HSBmLX嘉泰姆

PIN DESCRIPTIONmLX嘉泰姆
High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.mLX嘉泰姆

2mLX嘉泰姆

INmLX嘉泰姆

Connect a 22nF capacitor from BS pin to SW pin.Power Supply Input. Bypass this pin with a 10 F ceramic capacitor to GND, placed asmLX嘉泰姆

   

close to the IC as possible.mLX嘉泰姆

3mLX嘉泰姆
4mLX嘉泰姆

SWmLX嘉泰姆
GNDmLX嘉泰姆

Power Switching Output to External Inductor.Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return FB, COMP, and ISET to this GND, and connect this GND to power GND at a singlemLX嘉泰姆

5mLX嘉泰姆

FBmLX嘉泰姆

point for best noise immunity.Feedback Input. The voltage at this pin is regulated to 0.8V. Connect to the resistormLX嘉泰姆

   

divider between output and GND to set the output voltage.mLX嘉泰姆

6mLX嘉泰姆
7mLX嘉泰姆

COMPmLX嘉泰姆
ENmLX嘉泰姆

Error Amplifier Output. This pin is used to compensate the converter.Enable Input. EN is pulled up to 4.8V with a 10μA current, and contains a precise 1.6V logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC.mLX嘉泰姆

8mLX嘉泰姆

ISETmLX嘉泰姆

Drive to a logic-low to disable the IC and enter shutdown mode.Output Current Setting Pin. Connect a resistor from ISET to GND to program themLX嘉泰姆

 

ExposedmLX嘉泰姆

output current.Heat Dissipation Pad. Connect this exposed pad to large ground copper area withmLX嘉泰姆

六.电路原理图mLX嘉泰姆
mLX嘉泰姆
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七,功能概述mLX嘉泰姆


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