3A连续输出电流CXSD62145高/低边MOSFET PFM/PWM模式操作固定340kHz开关频率低ESR陶瓷输出电容稳定

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发表时间：2020-04-28浏览次数：173

3A连续输出电流CXSD62145高/低边MOSFET PFM/PWM模式操作固定340kHz开关频率低ESR陶瓷输出电容稳定

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

一,产品概述(General Description) rUw嘉泰姆
 CXSD62144 CXSD62145 CXSD62146 CXSD62147 is a 3A synchronous buck converter with integrated 110mΩ power MOSFETs. The CXSD62144 design with a current-mode control scheme, can convert wide input voltage of 4.5V to 24V to the output voltage adjustable from 0.925V to 20V to provide excellent output voltage regulation.rUw嘉泰姆
The CXSD62144 CXSD62145 CXSD62146 CXSD62147 is equipped with an automatic PFM/PWM mode operation. At light load, the IC operates in the PFM mode to reduce the switching losses. At heavy load, the IC works in PWM.rUw嘉泰姆
The CXSD62144 CXSD62145 CXSD62146 CXSD62147 is also equipped with Power-on-reset, softstart, and whole protections (over-temperature, and current-limit) into a single package.rUw嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.rUw嘉泰姆
二.产品特点(Features)rUw嘉泰姆
Wide Input Voltage from 4.5V to 24VrUw嘉泰姆
3A Continuous Output CurrentrUw嘉泰姆
Adjustable Output Voltage from 0.925V to 20VrUw嘉泰姆
Intergrated High/Low Side MOSFETrUw嘉泰姆
PFM/PWM mode OperationrUw嘉泰姆
Fixed 340kHz Switching FrequencyrUw嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsrUw嘉泰姆
Power-On-Reset DetectionrUw嘉泰姆
Programmable Soft-StartrUw嘉泰姆
Over-Temperature ProtectionrUw嘉泰姆
Current-Limit Protection with Frequency FoldbackrUw嘉泰姆
Enable/Shutdown FunctionrUw嘉泰姆
Small SOP-8P PackagerUw嘉泰姆
Lead Free and Green Devices AvailablerUw嘉泰姆
(RoHS CompliantrUw嘉泰姆
三,应用范围 (Applications)rUw嘉泰姆

LCD Monitor/TVrUw嘉泰姆

Set-Top BoxrUw嘉泰姆
DSL, Switch HUBrUw嘉泰姆
Notebook ComputerrUw嘉泰姆

四.下载产品资料PDF文档 rUw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！rUw嘉泰姆

QQ截图20160419174301.jpg rUw嘉泰姆

rUw嘉泰姆

五,产品封装图 (Package)rUw嘉泰姆

rUw嘉泰姆

六.电路原理图rUw嘉泰姆

rUw嘉泰姆

七,功能概述rUw嘉泰姆

Main Control LooprUw嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-rUw嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldrUw嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPrUw嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifierrUw嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputrUw嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative torUw嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currentrUw嘉泰姆
matches the new load current.rUw嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage LockoutrUw嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur whenrUw嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdrUw嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.rUw嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5VrUw嘉泰姆
with 0.2V of hysteresis. The EN pin should be connected a resistor divider from VIN to EN .After the VIN and ENrUw嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputrUw嘉泰姆
voltage to the setting of output voltage.rUw嘉泰姆
Over-Temperature Protection (OTP)rUw嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-rUw嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermalrUw嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctionrUw嘉泰姆
temperature cools by 50oC.rUw嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,rUw嘉泰姆
increasing life time of the IC.rUw嘉泰姆
Enable/ShutdownrUw嘉泰姆
Driving EN to ground places the CXSD62144 in shutdown.When in shutdown, the internal N-Channel power MOSFET turns off, all internal circuitry shuts down and the quies-cent supply current reduces to 0.3μA.rUw嘉泰姆
Current-Limit ProtectionrUw嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits therUw嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.rUw嘉泰姆
Frequency FoldbackrUw嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofrUw嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,rUw嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackrUw嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.rUw嘉泰姆
Over-Voltage ProtectionrUw嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of therUw嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driverrUw嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsrUw嘉泰姆
normal operation.rUw嘉泰姆
八,相关产品 更多同类产品.......rUw嘉泰姆

Switching Regulator > Buck ConverterrUw嘉泰姆
Part_No rUw嘉泰姆	PackagerUw嘉泰姆	ArchitecturUw嘉泰姆	No.ofrUw嘉泰姆 PWM rUw嘉泰姆 OutpurUw嘉泰姆	DriverUw嘉泰姆 LoutrUw嘉泰姆 (A) rUw嘉泰姆	Vin(V) rUw嘉泰姆		FmaxrUw嘉泰姆 Khz rUw嘉泰姆	Vref rUw嘉泰姆 (V) rUw嘉泰姆	R-Top (milohm) rUw嘉泰姆	R-Sync (milohm) rUw嘉泰姆	Iq (No load) (uA) rUw嘉泰姆
Part_No rUw嘉泰姆	PackagerUw嘉泰姆	ArchitecturUw嘉泰姆	No.ofrUw嘉泰姆 PWM rUw嘉泰姆 OutpurUw嘉泰姆	DriverUw嘉泰姆 LoutrUw嘉泰姆 (A) rUw嘉泰姆	minrUw嘉泰姆	maxrUw嘉泰姆	FmaxrUw嘉泰姆 Khz rUw嘉泰姆	Vref rUw嘉泰姆 (V) rUw嘉泰姆	R-Top (milohm) rUw嘉泰姆	R-Sync (milohm) rUw嘉泰姆	Iq (No load) (uA) rUw嘉泰姆
CXSD62122rUw嘉泰姆	TQFN5x6-28rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	5rUw嘉泰姆	4.5rUw嘉泰姆	26rUw嘉泰姆	380rUw嘉泰姆	0.8rUw嘉泰姆	50rUw嘉泰姆	20rUw嘉泰姆	1000rUw嘉泰姆
CXSD62123rUw嘉泰姆	SOP-8rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	2rUw嘉泰姆	4.5rUw嘉泰姆	26rUw嘉泰姆	380rUw嘉泰姆	0.8rUw嘉泰姆	100rUw嘉泰姆		1000rUw嘉泰姆
CXSD62124rUw嘉泰姆	SOP-8PrUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	4rUw嘉泰姆	4.5rUw嘉泰姆	26rUw嘉泰姆	380rUw嘉泰姆	0.8rUw嘉泰姆	80rUw嘉泰姆		1000rUw嘉泰姆
CXSD62125rUw嘉泰姆	SOT23-5\|TSOT23-5rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆	25rUw嘉泰姆
CXSD62125ArUw嘉泰姆	SOT23-5rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆
CXSD62126rUw嘉泰姆	SOP-8rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	3rUw嘉泰姆	4.3rUw嘉泰姆	14rUw嘉泰姆	500rUw嘉泰姆	0.8rUw嘉泰姆	70rUw嘉泰姆	70rUw嘉泰姆	500rUw嘉泰姆
CXSD62127rUw嘉泰姆	SOP-8PrUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	3rUw嘉泰姆	4.3rUw嘉泰姆	14rUw嘉泰姆	500rUw嘉泰姆	0.8rUw嘉泰姆	55rUw嘉泰姆	45rUw嘉泰姆	500rUw嘉泰姆
CXSD62128BrUw嘉泰姆	TDFN3x3-10rUw嘉泰姆			3rUw嘉泰姆	2.6rUw嘉泰姆	5.5rUw嘉泰姆	2000rUw嘉泰姆	0.8rUw嘉泰姆	110rUw嘉泰姆	110rUw嘉泰姆	460rUw嘉泰姆
CXSD62129rUw嘉泰姆	TDFN3x3-10rUw嘉泰姆	CMrUw嘉泰姆	2rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆	500rUw嘉泰姆
CXSD62129ArUw嘉泰姆	TDFN3x3-10rUw嘉泰姆	CMrUw嘉泰姆	2rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆
CXSD62130rUw嘉泰姆	TDFN2x2-6rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆	25rUw嘉泰姆
CXSD62130ArUw嘉泰姆	TDFN2x2-6rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆
CXSD62131rUw嘉泰姆	TDFN3x3-12rUw嘉泰姆	CMrUw嘉泰姆	2rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆	25rUw嘉泰姆
CXSD62131ArUw嘉泰姆	TDFN3x3-12rUw嘉泰姆	CMrUw嘉泰姆	2rUw嘉泰姆	1rUw嘉泰姆	2.7rUw嘉泰姆	6rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆
CXSD62131CrUw嘉泰姆	TDFN 3x3 12rUw嘉泰姆	CMrUw嘉泰姆	2rUw嘉泰姆	1rUw嘉泰姆	3rUw嘉泰姆	5.5rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆	30rUw嘉泰姆
CXSD62132rUw嘉泰姆	TQFN3x3-20rUw嘉泰姆	CMrUw嘉泰姆	3rUw嘉泰姆	2rUw嘉泰姆	2.9rUw嘉泰姆	5.5rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	-rUw嘉泰姆	-rUw嘉泰姆	300rUw嘉泰姆
CXSD62133rUw嘉泰姆	TDFN2x2-8rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	1rUw嘉泰姆	3.3rUw嘉泰姆	8rUw嘉泰姆	1500rUw嘉泰姆	0.6rUw嘉泰姆	280rUw嘉泰姆	250rUw嘉泰姆	25rUw嘉泰姆
CXSD62134rUw嘉泰姆	SOP-8rUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	2rUw嘉泰姆	4.5rUw嘉泰姆	24rUw嘉泰姆	340rUw嘉泰姆	0.925rUw嘉泰姆	110rUw嘉泰姆	110rUw嘉泰姆	1900rUw嘉泰姆
CXSD62135rUw嘉泰姆	SOP-8PrUw嘉泰姆	CMrUw嘉泰姆	1rUw嘉泰姆	3rUw嘉泰姆	4.5rUw嘉泰姆	24rUw嘉泰姆	340rUw嘉泰姆	0.925rUw嘉泰姆	110rUw嘉泰姆	110rUw嘉泰姆	1900rUw嘉泰姆

上一篇：110m功率mosfet 3A同步降压转换器CXSD62144电流模式控制4.5V至24V的宽输入电压转换为0.925V至20V的可调输出电压

下一篇：CXSD62146可编程软启动宽输入电压从4.5伏到24伏PFM模式下降低开关损耗上电复位

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