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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发表时间：2020-04-28浏览次数：72

CXSD62147 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qJH嘉泰姆
3.应用范围       4.下载产品资料PDF文档 qJH嘉泰姆
5.产品封装图                     6.电路原理图             qJH嘉泰姆
7.功能概述       8.相关产品qJH嘉泰姆

一,产品概述(General Description) qJH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.qJH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.qJH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.qJH嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.qJH嘉泰姆
二.产品特点(Features)qJH嘉泰姆
Wide Input Voltage from 4.5V to 24VqJH嘉泰姆
3A Continuous Output CurrentqJH嘉泰姆
Adjustable Output Voltage from 0.925V to 20VqJH嘉泰姆
Intergrated High/Low Side MOSFETqJH嘉泰姆
PFM/PWM mode OperationqJH嘉泰姆
Fixed 340kHz Switching FrequencyqJH嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsqJH嘉泰姆
Power-On-Reset DetectionqJH嘉泰姆
Programmable Soft-StartqJH嘉泰姆
Over-Temperature ProtectionqJH嘉泰姆
Current-Limit Protection with Frequency FoldbackqJH嘉泰姆
Enable/Shutdown FunctionqJH嘉泰姆
Small SOP-8P PackageqJH嘉泰姆
Lead Free and Green Devices AvailableqJH嘉泰姆
(RoHS CompliantqJH嘉泰姆
三,应用范围 (Applications)qJH嘉泰姆

LCD Monitor/TVqJH嘉泰姆

Set-Top BoxqJH嘉泰姆
DSL, Switch HUBqJH嘉泰姆
Notebook ComputerqJH嘉泰姆

四.下载产品资料PDF文档 qJH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！qJH嘉泰姆

QQ截图20160419174301.jpg qJH嘉泰姆

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五,产品封装图 (Package)qJH嘉泰姆

qJH嘉泰姆

六.电路原理图qJH嘉泰姆

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七,功能概述qJH嘉泰姆

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

Switching Regulator > Buck ConverterqJH嘉泰姆
Part_No qJH嘉泰姆	PackageqJH嘉泰姆	ArchitectuqJH嘉泰姆	No.ofqJH嘉泰姆 PWM qJH嘉泰姆 OutpuqJH嘉泰姆	DriveqJH嘉泰姆 LoutqJH嘉泰姆 (A) qJH嘉泰姆	Vin(V) qJH嘉泰姆		FmaxqJH嘉泰姆 Khz qJH嘉泰姆	Vref qJH嘉泰姆 (V) qJH嘉泰姆	R-Top (milohm) qJH嘉泰姆	R-Sync (milohm) qJH嘉泰姆	Iq (No load) (uA) qJH嘉泰姆
Part_No qJH嘉泰姆	PackageqJH嘉泰姆	ArchitectuqJH嘉泰姆	No.ofqJH嘉泰姆 PWM qJH嘉泰姆 OutpuqJH嘉泰姆	DriveqJH嘉泰姆 LoutqJH嘉泰姆 (A) qJH嘉泰姆	minqJH嘉泰姆	maxqJH嘉泰姆	FmaxqJH嘉泰姆 Khz qJH嘉泰姆	Vref qJH嘉泰姆 (V) qJH嘉泰姆	R-Top (milohm) qJH嘉泰姆	R-Sync (milohm) qJH嘉泰姆	Iq (No load) (uA) qJH嘉泰姆
CXSD62122qJH嘉泰姆	TQFN5x6-28qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	5qJH嘉泰姆	4.5qJH嘉泰姆	26qJH嘉泰姆	380qJH嘉泰姆	0.8qJH嘉泰姆	50qJH嘉泰姆	20qJH嘉泰姆	1000qJH嘉泰姆
CXSD62123qJH嘉泰姆	SOP-8qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	2qJH嘉泰姆	4.5qJH嘉泰姆	26qJH嘉泰姆	380qJH嘉泰姆	0.8qJH嘉泰姆	100qJH嘉泰姆		1000qJH嘉泰姆
CXSD62124qJH嘉泰姆	SOP-8PqJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	4qJH嘉泰姆	4.5qJH嘉泰姆	26qJH嘉泰姆	380qJH嘉泰姆	0.8qJH嘉泰姆	80qJH嘉泰姆		1000qJH嘉泰姆
CXSD62125qJH嘉泰姆	SOT23-5\|TSOT23-5qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆	25qJH嘉泰姆
CXSD62125AqJH嘉泰姆	SOT23-5qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆
CXSD62126qJH嘉泰姆	SOP-8qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	3qJH嘉泰姆	4.3qJH嘉泰姆	14qJH嘉泰姆	500qJH嘉泰姆	0.8qJH嘉泰姆	70qJH嘉泰姆	70qJH嘉泰姆	500qJH嘉泰姆
CXSD62127qJH嘉泰姆	SOP-8PqJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	3qJH嘉泰姆	4.3qJH嘉泰姆	14qJH嘉泰姆	500qJH嘉泰姆	0.8qJH嘉泰姆	55qJH嘉泰姆	45qJH嘉泰姆	500qJH嘉泰姆
CXSD62128BqJH嘉泰姆	TDFN3x3-10qJH嘉泰姆			3qJH嘉泰姆	2.6qJH嘉泰姆	5.5qJH嘉泰姆	2000qJH嘉泰姆	0.8qJH嘉泰姆	110qJH嘉泰姆	110qJH嘉泰姆	460qJH嘉泰姆
CXSD62129qJH嘉泰姆	TDFN3x3-10qJH嘉泰姆	CMqJH嘉泰姆	2qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆	500qJH嘉泰姆
CXSD62129AqJH嘉泰姆	TDFN3x3-10qJH嘉泰姆	CMqJH嘉泰姆	2qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆
CXSD62130qJH嘉泰姆	TDFN2x2-6qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆	25qJH嘉泰姆
CXSD62130AqJH嘉泰姆	TDFN2x2-6qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆
CXSD62131qJH嘉泰姆	TDFN3x3-12qJH嘉泰姆	CMqJH嘉泰姆	2qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆	25qJH嘉泰姆
CXSD62131AqJH嘉泰姆	TDFN3x3-12qJH嘉泰姆	CMqJH嘉泰姆	2qJH嘉泰姆	1qJH嘉泰姆	2.7qJH嘉泰姆	6qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆
CXSD62131CqJH嘉泰姆	TDFN 3x3 12qJH嘉泰姆	CMqJH嘉泰姆	2qJH嘉泰姆	1qJH嘉泰姆	3qJH嘉泰姆	5.5qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆	30qJH嘉泰姆
CXSD62132qJH嘉泰姆	TQFN3x3-20qJH嘉泰姆	CMqJH嘉泰姆	3qJH嘉泰姆	2qJH嘉泰姆	2.9qJH嘉泰姆	5.5qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	-qJH嘉泰姆	-qJH嘉泰姆	300qJH嘉泰姆
CXSD62133qJH嘉泰姆	TDFN2x2-8qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	1qJH嘉泰姆	3.3qJH嘉泰姆	8qJH嘉泰姆	1500qJH嘉泰姆	0.6qJH嘉泰姆	280qJH嘉泰姆	250qJH嘉泰姆	25qJH嘉泰姆
CXSD62134qJH嘉泰姆	SOP-8qJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	2qJH嘉泰姆	4.5qJH嘉泰姆	24qJH嘉泰姆	340qJH嘉泰姆	0.925qJH嘉泰姆	110qJH嘉泰姆	110qJH嘉泰姆	1900qJH嘉泰姆
CXSD62135qJH嘉泰姆	SOP-8PqJH嘉泰姆	CMqJH嘉泰姆	1qJH嘉泰姆	3qJH嘉泰姆	4.5qJH嘉泰姆	24qJH嘉泰姆	340qJH嘉泰姆	0.925qJH嘉泰姆	110qJH嘉泰姆	110qJH嘉泰姆	1900qJH嘉泰姆

上一篇：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

下一篇：2.5A连续输出电流CXSD62148 固定500kHz开关频率可调输出电压0.807V至13V HICCUP模式的限流保护

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