CXSD61020 wide input voltage high-efficiency Step-down DC/DC converter that operates in either CV (C

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

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                     6.电路原理图                   
7.功能概述                        8.相关产品

 

一,产品概述(General Description)      

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    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. 

       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.产品特点(Features)

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10V to 36V Input Voltage

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

三,应用范围 (Applications)

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Car Charger/Adaptor
Rechargeable Portable Devices
General-Purpose CC/CV Supply
四.下载产品资料PDF文档 

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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！

 

五,产品封装图 (Package)

PIN 1	NAME HSB	PIN DESCRIPTION High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
2	IN	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 as
		close to the IC as possible.
3 4	SW GND	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 single
5	FB	point for best noise immunity.Feedback Input. The voltage at this pin is regulated to 0.8V. Connect to the resistor
		divider between output and GND to set the output voltage.
6 7	COMP EN	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.
8	ISET	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 the
	Exposed	output current.Heat Dissipation Pad. Connect this exposed pad to large ground copper area with

六.电路原理图


七,功能概述

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    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.
八,相关产品                更多同类产品......

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DC-DC降压IC
型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	静态工作电流
CXSD61023A	42V	可调输出/带CC/cv模式 恒流模式保护	3.5A	0.8V	125K	94%	3mA
CXSD61021A	42V	可调输出/带CC/cv模式 恒流模式保护	3A	0.8V	125K	94%	3mA
CXSD61022A	42V	可调输出/带CC/cv模式 恒流模式保护	2.5A	0.8V	125K	94%	3mA
CXSD61020	40V	可调输出/带CC/cv模式	3A	0.8V	225K	92%	2.84mA
CXSD61027	50V	5V固定输出	3.2A		150K	87%	4.7mA
CXSD61026	50V	5V固定输出	2.4A		150K	89%	4.7mA
CXSD61025	50V	5V固定输出	2.1A		150K	90%	4.7mA
CXSD61024	50V	5V固定输出	1.8A		150K	90%	4.7mA
CXSD61015	40V	可调输出/带CC/CV模式带线损补偿	3A	0.8V	125K	94%	4mA
CXSD61014A	40V	5V固定输出	3.5A		150K	93%	2mA
CXSD61013B	45V	可调输出/	2A	1.23V	150K	93%	2mA
CXSD61012	40V	可调输出/带CC/CV模式	2A	1.18V	110K	93%	10mA
CXSD61011	42V	可调输出	3A	0.8V	50-500K	91%	3mA
CXSD61018	40V	可调输出/带CC/cv模式	3A	1.25V	180K	89%	2.1mA
CXSD61019	40V	可调输出/带CC/cv模式	3.5A	1.25V	180K	87%	2.1mA
CXSD61017	45V	可调输出/带CC模式	3A	1.25V	150K	89%	2.0mA
CXSD61016	45V	可调输出/带CC模式	2A	1.235V	150K	83%	2.0mA
CXSD61006B	4.75V-40V	可调输出	0.8A	0.8V	550K	90%	10uA
CXSD61006	4.0-42V	可调输出	1.5A	0.8V	650K	91%	600uA
CXSD61005	4.5-25V	可调输出	1.8A	0.8V	1.4M	92%	1.8mA
CXSD61010A	20V	可调输出	3.5A	1.2V	400K	89%	700uA
CXSD61010	28V	可调输出	3A	1.22V	380K	89%	3mA
CXSD61009	20V	可调输出	3A	0.8V	380K	88%	3mA
CXSD61008	20V	可调输出	2A	0.8V	380K	89%	2mA
CXSD61007	45V	5.0V/可调输出/3.3/12V	2A	1.23V	150K	82%	2mA
CXSD61003	45V	5.0V/可调输出	3A	1.23V	380K	73%	2mA
CXSD61004	27V	可调输出	2A	1.22V	420K	95%	1mA