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：300

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

一,产品概述(General Description) QTT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.QTT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.QTT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.QTT嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.QTT嘉泰姆
二.产品特点(Features)QTT嘉泰姆
Wide Input Voltage from 4.5V to 24VQTT嘉泰姆
3A Continuous Output CurrentQTT嘉泰姆
Adjustable Output Voltage from 0.925V to 20VQTT嘉泰姆
Intergrated High/Low Side MOSFETQTT嘉泰姆
PFM/PWM mode OperationQTT嘉泰姆
Fixed 340kHz Switching FrequencyQTT嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsQTT嘉泰姆
Power-On-Reset DetectionQTT嘉泰姆
Programmable Soft-StartQTT嘉泰姆
Over-Temperature ProtectionQTT嘉泰姆
Current-Limit Protection with Frequency FoldbackQTT嘉泰姆
Enable/Shutdown FunctionQTT嘉泰姆
Small SOP-8P PackageQTT嘉泰姆
Lead Free and Green Devices AvailableQTT嘉泰姆
(RoHS CompliantQTT嘉泰姆
三,应用范围 (Applications)QTT嘉泰姆

LCD Monitor/TVQTT嘉泰姆

Set-Top BoxQTT嘉泰姆
DSL, Switch HUBQTT嘉泰姆
Notebook ComputerQTT嘉泰姆

四.下载产品资料PDF文档 QTT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！QTT嘉泰姆

QQ截图20160419174301.jpg QTT嘉泰姆

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五,产品封装图 (Package)QTT嘉泰姆

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六.电路原理图QTT嘉泰姆

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七,功能概述QTT嘉泰姆

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

Switching Regulator > Buck ConverterQTT嘉泰姆
Part_No QTT嘉泰姆	PackageQTT嘉泰姆	ArchitectuQTT嘉泰姆	No.ofQTT嘉泰姆 PWM QTT嘉泰姆 OutpuQTT嘉泰姆	DriveQTT嘉泰姆 LoutQTT嘉泰姆 (A) QTT嘉泰姆	Vin(V) QTT嘉泰姆		FmaxQTT嘉泰姆 Khz QTT嘉泰姆	Vref QTT嘉泰姆 (V) QTT嘉泰姆	R-Top (milohm) QTT嘉泰姆	R-Sync (milohm) QTT嘉泰姆	Iq (No load) (uA) QTT嘉泰姆
Part_No QTT嘉泰姆	PackageQTT嘉泰姆	ArchitectuQTT嘉泰姆	No.ofQTT嘉泰姆 PWM QTT嘉泰姆 OutpuQTT嘉泰姆	DriveQTT嘉泰姆 LoutQTT嘉泰姆 (A) QTT嘉泰姆	minQTT嘉泰姆	maxQTT嘉泰姆	FmaxQTT嘉泰姆 Khz QTT嘉泰姆	Vref QTT嘉泰姆 (V) QTT嘉泰姆	R-Top (milohm) QTT嘉泰姆	R-Sync (milohm) QTT嘉泰姆	Iq (No load) (uA) QTT嘉泰姆
CXSD62122QTT嘉泰姆	TQFN5x6-28QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	5QTT嘉泰姆	4.5QTT嘉泰姆	26QTT嘉泰姆	380QTT嘉泰姆	0.8QTT嘉泰姆	50QTT嘉泰姆	20QTT嘉泰姆	1000QTT嘉泰姆
CXSD62123QTT嘉泰姆	SOP-8QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	2QTT嘉泰姆	4.5QTT嘉泰姆	26QTT嘉泰姆	380QTT嘉泰姆	0.8QTT嘉泰姆	100QTT嘉泰姆		1000QTT嘉泰姆
CXSD62124QTT嘉泰姆	SOP-8PQTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	4QTT嘉泰姆	4.5QTT嘉泰姆	26QTT嘉泰姆	380QTT嘉泰姆	0.8QTT嘉泰姆	80QTT嘉泰姆		1000QTT嘉泰姆
CXSD62125QTT嘉泰姆	SOT23-5\|TSOT23-5QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆	25QTT嘉泰姆
CXSD62125AQTT嘉泰姆	SOT23-5QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆
CXSD62126QTT嘉泰姆	SOP-8QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	3QTT嘉泰姆	4.3QTT嘉泰姆	14QTT嘉泰姆	500QTT嘉泰姆	0.8QTT嘉泰姆	70QTT嘉泰姆	70QTT嘉泰姆	500QTT嘉泰姆
CXSD62127QTT嘉泰姆	SOP-8PQTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	3QTT嘉泰姆	4.3QTT嘉泰姆	14QTT嘉泰姆	500QTT嘉泰姆	0.8QTT嘉泰姆	55QTT嘉泰姆	45QTT嘉泰姆	500QTT嘉泰姆
CXSD62128BQTT嘉泰姆	TDFN3x3-10QTT嘉泰姆			3QTT嘉泰姆	2.6QTT嘉泰姆	5.5QTT嘉泰姆	2000QTT嘉泰姆	0.8QTT嘉泰姆	110QTT嘉泰姆	110QTT嘉泰姆	460QTT嘉泰姆
CXSD62129QTT嘉泰姆	TDFN3x3-10QTT嘉泰姆	CMQTT嘉泰姆	2QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆	500QTT嘉泰姆
CXSD62129AQTT嘉泰姆	TDFN3x3-10QTT嘉泰姆	CMQTT嘉泰姆	2QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆
CXSD62130QTT嘉泰姆	TDFN2x2-6QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆	25QTT嘉泰姆
CXSD62130AQTT嘉泰姆	TDFN2x2-6QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆
CXSD62131QTT嘉泰姆	TDFN3x3-12QTT嘉泰姆	CMQTT嘉泰姆	2QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆	25QTT嘉泰姆
CXSD62131AQTT嘉泰姆	TDFN3x3-12QTT嘉泰姆	CMQTT嘉泰姆	2QTT嘉泰姆	1QTT嘉泰姆	2.7QTT嘉泰姆	6QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆
CXSD62131CQTT嘉泰姆	TDFN 3x3 12QTT嘉泰姆	CMQTT嘉泰姆	2QTT嘉泰姆	1QTT嘉泰姆	3QTT嘉泰姆	5.5QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆	30QTT嘉泰姆
CXSD62132QTT嘉泰姆	TQFN3x3-20QTT嘉泰姆	CMQTT嘉泰姆	3QTT嘉泰姆	2QTT嘉泰姆	2.9QTT嘉泰姆	5.5QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	-QTT嘉泰姆	-QTT嘉泰姆	300QTT嘉泰姆
CXSD62133QTT嘉泰姆	TDFN2x2-8QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	1QTT嘉泰姆	3.3QTT嘉泰姆	8QTT嘉泰姆	1500QTT嘉泰姆	0.6QTT嘉泰姆	280QTT嘉泰姆	250QTT嘉泰姆	25QTT嘉泰姆
CXSD62134QTT嘉泰姆	SOP-8QTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	2QTT嘉泰姆	4.5QTT嘉泰姆	24QTT嘉泰姆	340QTT嘉泰姆	0.925QTT嘉泰姆	110QTT嘉泰姆	110QTT嘉泰姆	1900QTT嘉泰姆
CXSD62135QTT嘉泰姆	SOP-8PQTT嘉泰姆	CMQTT嘉泰姆	1QTT嘉泰姆	3QTT嘉泰姆	4.5QTT嘉泰姆	24QTT嘉泰姆	340QTT嘉泰姆	0.925QTT嘉泰姆	110QTT嘉泰姆	110QTT嘉泰姆	1900QTT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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