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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发表时间：2020-04-28浏览次数：180

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

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

一,产品概述(General Description) QAd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.QAd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.QAd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.QAd嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.QAd嘉泰姆
二.产品特点(Features)QAd嘉泰姆
Wide Input Voltage from 4.5V to 24VQAd嘉泰姆
3A Continuous Output CurrentQAd嘉泰姆
Adjustable Output Voltage from 0.925V to 20VQAd嘉泰姆
Intergrated High/Low Side MOSFETQAd嘉泰姆
PFM/PWM mode OperationQAd嘉泰姆
Fixed 340kHz Switching FrequencyQAd嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsQAd嘉泰姆
Power-On-Reset DetectionQAd嘉泰姆
Programmable Soft-StartQAd嘉泰姆
Over-Temperature ProtectionQAd嘉泰姆
Current-Limit Protection with Frequency FoldbackQAd嘉泰姆
Enable/Shutdown FunctionQAd嘉泰姆
Small SOP-8P PackageQAd嘉泰姆
Lead Free and Green Devices AvailableQAd嘉泰姆
(RoHS CompliantQAd嘉泰姆
三,应用范围 (Applications)QAd嘉泰姆

LCD Monitor/TVQAd嘉泰姆

Set-Top BoxQAd嘉泰姆
DSL, Switch HUBQAd嘉泰姆
Notebook ComputerQAd嘉泰姆

四.下载产品资料PDF文档 QAd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！QAd嘉泰姆

QQ截图20160419174301.jpg QAd嘉泰姆

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五,产品封装图 (Package)QAd嘉泰姆

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六.电路原理图QAd嘉泰姆

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七,功能概述QAd嘉泰姆

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

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Part_No QAd嘉泰姆	PackageQAd嘉泰姆	ArchitectuQAd嘉泰姆	No.ofQAd嘉泰姆 PWM QAd嘉泰姆 OutpuQAd嘉泰姆	DriveQAd嘉泰姆 LoutQAd嘉泰姆 (A) QAd嘉泰姆	minQAd嘉泰姆	maxQAd嘉泰姆	FmaxQAd嘉泰姆 Khz QAd嘉泰姆	Vref QAd嘉泰姆 (V) QAd嘉泰姆	R-Top (milohm) QAd嘉泰姆	R-Sync (milohm) QAd嘉泰姆	Iq (No load) (uA) QAd嘉泰姆
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CXSD62124QAd嘉泰姆	SOP-8PQAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	4QAd嘉泰姆	4.5QAd嘉泰姆	26QAd嘉泰姆	380QAd嘉泰姆	0.8QAd嘉泰姆	80QAd嘉泰姆		1000QAd嘉泰姆
CXSD62125QAd嘉泰姆	SOT23-5\|TSOT23-5QAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆	25QAd嘉泰姆
CXSD62125AQAd嘉泰姆	SOT23-5QAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆
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CXSD62127QAd嘉泰姆	SOP-8PQAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	3QAd嘉泰姆	4.3QAd嘉泰姆	14QAd嘉泰姆	500QAd嘉泰姆	0.8QAd嘉泰姆	55QAd嘉泰姆	45QAd嘉泰姆	500QAd嘉泰姆
CXSD62128BQAd嘉泰姆	TDFN3x3-10QAd嘉泰姆			3QAd嘉泰姆	2.6QAd嘉泰姆	5.5QAd嘉泰姆	2000QAd嘉泰姆	0.8QAd嘉泰姆	110QAd嘉泰姆	110QAd嘉泰姆	460QAd嘉泰姆
CXSD62129QAd嘉泰姆	TDFN3x3-10QAd嘉泰姆	CMQAd嘉泰姆	2QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆	500QAd嘉泰姆
CXSD62129AQAd嘉泰姆	TDFN3x3-10QAd嘉泰姆	CMQAd嘉泰姆	2QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆
CXSD62130QAd嘉泰姆	TDFN2x2-6QAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆	25QAd嘉泰姆
CXSD62130AQAd嘉泰姆	TDFN2x2-6QAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆
CXSD62131QAd嘉泰姆	TDFN3x3-12QAd嘉泰姆	CMQAd嘉泰姆	2QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆	25QAd嘉泰姆
CXSD62131AQAd嘉泰姆	TDFN3x3-12QAd嘉泰姆	CMQAd嘉泰姆	2QAd嘉泰姆	1QAd嘉泰姆	2.7QAd嘉泰姆	6QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆
CXSD62131CQAd嘉泰姆	TDFN 3x3 12QAd嘉泰姆	CMQAd嘉泰姆	2QAd嘉泰姆	1QAd嘉泰姆	3QAd嘉泰姆	5.5QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆	30QAd嘉泰姆
CXSD62132QAd嘉泰姆	TQFN3x3-20QAd嘉泰姆	CMQAd嘉泰姆	3QAd嘉泰姆	2QAd嘉泰姆	2.9QAd嘉泰姆	5.5QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	-QAd嘉泰姆	-QAd嘉泰姆	300QAd嘉泰姆
CXSD62133QAd嘉泰姆	TDFN2x2-8QAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	1QAd嘉泰姆	3.3QAd嘉泰姆	8QAd嘉泰姆	1500QAd嘉泰姆	0.6QAd嘉泰姆	280QAd嘉泰姆	250QAd嘉泰姆	25QAd嘉泰姆
CXSD62134QAd嘉泰姆	SOP-8QAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	2QAd嘉泰姆	4.5QAd嘉泰姆	24QAd嘉泰姆	340QAd嘉泰姆	0.925QAd嘉泰姆	110QAd嘉泰姆	110QAd嘉泰姆	1900QAd嘉泰姆
CXSD62135QAd嘉泰姆	SOP-8PQAd嘉泰姆	CMQAd嘉泰姆	1QAd嘉泰姆	3QAd嘉泰姆	4.5QAd嘉泰姆	24QAd嘉泰姆	340QAd嘉泰姆	0.925QAd嘉泰姆	110QAd嘉泰姆	110QAd嘉泰姆	1900QAd嘉泰姆

上一篇：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

下一篇：CXSD62147 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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