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：290

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xz8嘉泰姆
3.应用范围       4.下载产品资料PDF文档 xz8嘉泰姆
5.产品封装图                     6.电路原理图             xz8嘉泰姆
7.功能概述       8.相关产品xz8嘉泰姆

一,产品概述(General Description) xz8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.xz8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.xz8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.xz8嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.xz8嘉泰姆
二.产品特点(Features)xz8嘉泰姆
Wide Input Voltage from 4.5V to 24Vxz8嘉泰姆
3A Continuous Output Currentxz8嘉泰姆
Adjustable Output Voltage from 0.925V to 20Vxz8嘉泰姆
Intergrated High/Low Side MOSFETxz8嘉泰姆
PFM/PWM mode Operationxz8嘉泰姆
Fixed 340kHz Switching Frequencyxz8嘉泰姆
Stable with Low ESR Ceramic Output Capacitorsxz8嘉泰姆
Power-On-Reset Detectionxz8嘉泰姆
Programmable Soft-Startxz8嘉泰姆
Over-Temperature Protectionxz8嘉泰姆
Current-Limit Protection with Frequency Foldbackxz8嘉泰姆
Enable/Shutdown Functionxz8嘉泰姆
Small SOP-8P Packagexz8嘉泰姆
Lead Free and Green Devices Availablexz8嘉泰姆
(RoHS Compliantxz8嘉泰姆
三,应用范围 (Applications)xz8嘉泰姆

LCD Monitor/TVxz8嘉泰姆

Set-Top Boxxz8嘉泰姆
DSL, Switch HUBxz8嘉泰姆
Notebook Computerxz8嘉泰姆

四.下载产品资料PDF文档 xz8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！xz8嘉泰姆

QQ截图20160419174301.jpg xz8嘉泰姆

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五,产品封装图 (Package)xz8嘉泰姆

xz8嘉泰姆

六.电路原理图xz8嘉泰姆

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七,功能概述xz8嘉泰姆

Main Control Loopxz8嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-xz8嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldxz8嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPxz8嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifierxz8嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputxz8嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toxz8嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currentxz8嘉泰姆
matches the new load current.xz8嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage Lockoutxz8嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur whenxz8嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdxz8嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.xz8嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5Vxz8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 ENxz8嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputxz8嘉泰姆
voltage to the setting of output voltage.xz8嘉泰姆
Over-Temperature Protection (OTP)xz8嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-xz8嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermalxz8嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctionxz8嘉泰姆
temperature cools by 50oC.xz8嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,xz8嘉泰姆
increasing life time of the IC.xz8嘉泰姆
Enable/Shutdownxz8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.xz8嘉泰姆
Current-Limit Protectionxz8嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits thexz8嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.xz8嘉泰姆
Frequency Foldbackxz8嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofxz8嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,xz8嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackxz8嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.xz8嘉泰姆
Over-Voltage Protectionxz8嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of thexz8嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driverxz8嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsxz8嘉泰姆
normal operation.xz8嘉泰姆
八,相关产品 更多同类产品.......xz8嘉泰姆

Switching Regulator > Buck Converterxz8嘉泰姆
Part_No xz8嘉泰姆	Packagexz8嘉泰姆	Architectuxz8嘉泰姆	No.ofxz8嘉泰姆 PWM xz8嘉泰姆 Outpuxz8嘉泰姆	Drivexz8嘉泰姆 Loutxz8嘉泰姆 (A) xz8嘉泰姆	Vin(V) xz8嘉泰姆		Fmaxxz8嘉泰姆 Khz xz8嘉泰姆	Vref xz8嘉泰姆 (V) xz8嘉泰姆	R-Top (milohm) xz8嘉泰姆	R-Sync (milohm) xz8嘉泰姆	Iq (No load) (uA) xz8嘉泰姆
Part_No xz8嘉泰姆	Packagexz8嘉泰姆	Architectuxz8嘉泰姆	No.ofxz8嘉泰姆 PWM xz8嘉泰姆 Outpuxz8嘉泰姆	Drivexz8嘉泰姆 Loutxz8嘉泰姆 (A) xz8嘉泰姆	minxz8嘉泰姆	maxxz8嘉泰姆	Fmaxxz8嘉泰姆 Khz xz8嘉泰姆	Vref xz8嘉泰姆 (V) xz8嘉泰姆	R-Top (milohm) xz8嘉泰姆	R-Sync (milohm) xz8嘉泰姆	Iq (No load) (uA) xz8嘉泰姆
CXSD62122xz8嘉泰姆	TQFN5x6-28xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	5xz8嘉泰姆	4.5xz8嘉泰姆	26xz8嘉泰姆	380xz8嘉泰姆	0.8xz8嘉泰姆	50xz8嘉泰姆	20xz8嘉泰姆	1000xz8嘉泰姆
CXSD62123xz8嘉泰姆	SOP-8xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	2xz8嘉泰姆	4.5xz8嘉泰姆	26xz8嘉泰姆	380xz8嘉泰姆	0.8xz8嘉泰姆	100xz8嘉泰姆		1000xz8嘉泰姆
CXSD62124xz8嘉泰姆	SOP-8Pxz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	4xz8嘉泰姆	4.5xz8嘉泰姆	26xz8嘉泰姆	380xz8嘉泰姆	0.8xz8嘉泰姆	80xz8嘉泰姆		1000xz8嘉泰姆
CXSD62125xz8嘉泰姆	SOT23-5\|TSOT23-5xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆	25xz8嘉泰姆
CXSD62125Axz8嘉泰姆	SOT23-5xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆
CXSD62126xz8嘉泰姆	SOP-8xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	3xz8嘉泰姆	4.3xz8嘉泰姆	14xz8嘉泰姆	500xz8嘉泰姆	0.8xz8嘉泰姆	70xz8嘉泰姆	70xz8嘉泰姆	500xz8嘉泰姆
CXSD62127xz8嘉泰姆	SOP-8Pxz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	3xz8嘉泰姆	4.3xz8嘉泰姆	14xz8嘉泰姆	500xz8嘉泰姆	0.8xz8嘉泰姆	55xz8嘉泰姆	45xz8嘉泰姆	500xz8嘉泰姆
CXSD62128Bxz8嘉泰姆	TDFN3x3-10xz8嘉泰姆			3xz8嘉泰姆	2.6xz8嘉泰姆	5.5xz8嘉泰姆	2000xz8嘉泰姆	0.8xz8嘉泰姆	110xz8嘉泰姆	110xz8嘉泰姆	460xz8嘉泰姆
CXSD62129xz8嘉泰姆	TDFN3x3-10xz8嘉泰姆	CMxz8嘉泰姆	2xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆	500xz8嘉泰姆
CXSD62129Axz8嘉泰姆	TDFN3x3-10xz8嘉泰姆	CMxz8嘉泰姆	2xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆
CXSD62130xz8嘉泰姆	TDFN2x2-6xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆	25xz8嘉泰姆
CXSD62130Axz8嘉泰姆	TDFN2x2-6xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆
CXSD62131xz8嘉泰姆	TDFN3x3-12xz8嘉泰姆	CMxz8嘉泰姆	2xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆	25xz8嘉泰姆
CXSD62131Axz8嘉泰姆	TDFN3x3-12xz8嘉泰姆	CMxz8嘉泰姆	2xz8嘉泰姆	1xz8嘉泰姆	2.7xz8嘉泰姆	6xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆
CXSD62131Cxz8嘉泰姆	TDFN 3x3 12xz8嘉泰姆	CMxz8嘉泰姆	2xz8嘉泰姆	1xz8嘉泰姆	3xz8嘉泰姆	5.5xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆	30xz8嘉泰姆
CXSD62132xz8嘉泰姆	TQFN3x3-20xz8嘉泰姆	CMxz8嘉泰姆	3xz8嘉泰姆	2xz8嘉泰姆	2.9xz8嘉泰姆	5.5xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	-xz8嘉泰姆	-xz8嘉泰姆	300xz8嘉泰姆
CXSD62133xz8嘉泰姆	TDFN2x2-8xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	1xz8嘉泰姆	3.3xz8嘉泰姆	8xz8嘉泰姆	1500xz8嘉泰姆	0.6xz8嘉泰姆	280xz8嘉泰姆	250xz8嘉泰姆	25xz8嘉泰姆
CXSD62134xz8嘉泰姆	SOP-8xz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	2xz8嘉泰姆	4.5xz8嘉泰姆	24xz8嘉泰姆	340xz8嘉泰姆	0.925xz8嘉泰姆	110xz8嘉泰姆	110xz8嘉泰姆	1900xz8嘉泰姆
CXSD62135xz8嘉泰姆	SOP-8Pxz8嘉泰姆	CMxz8嘉泰姆	1xz8嘉泰姆	3xz8嘉泰姆	4.5xz8嘉泰姆	24xz8嘉泰姆	340xz8嘉泰姆	0.925xz8嘉泰姆	110xz8嘉泰姆	110xz8嘉泰姆	1900xz8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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