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：56

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

一,产品概述(General Description) zRd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.zRd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.zRd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.zRd嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.zRd嘉泰姆
二.产品特点(Features)zRd嘉泰姆
Wide Input Voltage from 4.5V to 24VzRd嘉泰姆
3A Continuous Output CurrentzRd嘉泰姆
Adjustable Output Voltage from 0.925V to 20VzRd嘉泰姆
Intergrated High/Low Side MOSFETzRd嘉泰姆
PFM/PWM mode OperationzRd嘉泰姆
Fixed 340kHz Switching FrequencyzRd嘉泰姆
Stable with Low ESR Ceramic Output CapacitorszRd嘉泰姆
Power-On-Reset DetectionzRd嘉泰姆
Programmable Soft-StartzRd嘉泰姆
Over-Temperature ProtectionzRd嘉泰姆
Current-Limit Protection with Frequency FoldbackzRd嘉泰姆
Enable/Shutdown FunctionzRd嘉泰姆
Small SOP-8P PackagezRd嘉泰姆
Lead Free and Green Devices AvailablezRd嘉泰姆
(RoHS CompliantzRd嘉泰姆
三,应用范围 (Applications)zRd嘉泰姆

LCD Monitor/TVzRd嘉泰姆

Set-Top BoxzRd嘉泰姆
DSL, Switch HUBzRd嘉泰姆
Notebook ComputerzRd嘉泰姆

四.下载产品资料PDF文档 zRd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！zRd嘉泰姆

QQ截图20160419174301.jpg zRd嘉泰姆

zRd嘉泰姆

五,产品封装图 (Package)zRd嘉泰姆

zRd嘉泰姆

六.电路原理图zRd嘉泰姆

zRd嘉泰姆

七,功能概述zRd嘉泰姆

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

Switching Regulator > Buck ConverterzRd嘉泰姆
Part_No zRd嘉泰姆	PackagezRd嘉泰姆	ArchitectuzRd嘉泰姆	No.ofzRd嘉泰姆 PWM zRd嘉泰姆 OutpuzRd嘉泰姆	DrivezRd嘉泰姆 LoutzRd嘉泰姆 (A) zRd嘉泰姆	Vin(V) zRd嘉泰姆		FmaxzRd嘉泰姆 Khz zRd嘉泰姆	Vref zRd嘉泰姆 (V) zRd嘉泰姆	R-Top (milohm) zRd嘉泰姆	R-Sync (milohm) zRd嘉泰姆	Iq (No load) (uA) zRd嘉泰姆
Part_No zRd嘉泰姆	PackagezRd嘉泰姆	ArchitectuzRd嘉泰姆	No.ofzRd嘉泰姆 PWM zRd嘉泰姆 OutpuzRd嘉泰姆	DrivezRd嘉泰姆 LoutzRd嘉泰姆 (A) zRd嘉泰姆	minzRd嘉泰姆	maxzRd嘉泰姆	FmaxzRd嘉泰姆 Khz zRd嘉泰姆	Vref zRd嘉泰姆 (V) zRd嘉泰姆	R-Top (milohm) zRd嘉泰姆	R-Sync (milohm) zRd嘉泰姆	Iq (No load) (uA) zRd嘉泰姆
CXSD62122zRd嘉泰姆	TQFN5x6-28zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	5zRd嘉泰姆	4.5zRd嘉泰姆	26zRd嘉泰姆	380zRd嘉泰姆	0.8zRd嘉泰姆	50zRd嘉泰姆	20zRd嘉泰姆	1000zRd嘉泰姆
CXSD62123zRd嘉泰姆	SOP-8zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	2zRd嘉泰姆	4.5zRd嘉泰姆	26zRd嘉泰姆	380zRd嘉泰姆	0.8zRd嘉泰姆	100zRd嘉泰姆		1000zRd嘉泰姆
CXSD62124zRd嘉泰姆	SOP-8PzRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	4zRd嘉泰姆	4.5zRd嘉泰姆	26zRd嘉泰姆	380zRd嘉泰姆	0.8zRd嘉泰姆	80zRd嘉泰姆		1000zRd嘉泰姆
CXSD62125zRd嘉泰姆	SOT23-5\|TSOT23-5zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆	25zRd嘉泰姆
CXSD62125AzRd嘉泰姆	SOT23-5zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆
CXSD62126zRd嘉泰姆	SOP-8zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	3zRd嘉泰姆	4.3zRd嘉泰姆	14zRd嘉泰姆	500zRd嘉泰姆	0.8zRd嘉泰姆	70zRd嘉泰姆	70zRd嘉泰姆	500zRd嘉泰姆
CXSD62127zRd嘉泰姆	SOP-8PzRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	3zRd嘉泰姆	4.3zRd嘉泰姆	14zRd嘉泰姆	500zRd嘉泰姆	0.8zRd嘉泰姆	55zRd嘉泰姆	45zRd嘉泰姆	500zRd嘉泰姆
CXSD62128BzRd嘉泰姆	TDFN3x3-10zRd嘉泰姆			3zRd嘉泰姆	2.6zRd嘉泰姆	5.5zRd嘉泰姆	2000zRd嘉泰姆	0.8zRd嘉泰姆	110zRd嘉泰姆	110zRd嘉泰姆	460zRd嘉泰姆
CXSD62129zRd嘉泰姆	TDFN3x3-10zRd嘉泰姆	CMzRd嘉泰姆	2zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆	500zRd嘉泰姆
CXSD62129AzRd嘉泰姆	TDFN3x3-10zRd嘉泰姆	CMzRd嘉泰姆	2zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆
CXSD62130zRd嘉泰姆	TDFN2x2-6zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆	25zRd嘉泰姆
CXSD62130AzRd嘉泰姆	TDFN2x2-6zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆
CXSD62131zRd嘉泰姆	TDFN3x3-12zRd嘉泰姆	CMzRd嘉泰姆	2zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆	25zRd嘉泰姆
CXSD62131AzRd嘉泰姆	TDFN3x3-12zRd嘉泰姆	CMzRd嘉泰姆	2zRd嘉泰姆	1zRd嘉泰姆	2.7zRd嘉泰姆	6zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆
CXSD62131CzRd嘉泰姆	TDFN 3x3 12zRd嘉泰姆	CMzRd嘉泰姆	2zRd嘉泰姆	1zRd嘉泰姆	3zRd嘉泰姆	5.5zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆	30zRd嘉泰姆
CXSD62132zRd嘉泰姆	TQFN3x3-20zRd嘉泰姆	CMzRd嘉泰姆	3zRd嘉泰姆	2zRd嘉泰姆	2.9zRd嘉泰姆	5.5zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	-zRd嘉泰姆	-zRd嘉泰姆	300zRd嘉泰姆
CXSD62133zRd嘉泰姆	TDFN2x2-8zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	1zRd嘉泰姆	3.3zRd嘉泰姆	8zRd嘉泰姆	1500zRd嘉泰姆	0.6zRd嘉泰姆	280zRd嘉泰姆	250zRd嘉泰姆	25zRd嘉泰姆
CXSD62134zRd嘉泰姆	SOP-8zRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	2zRd嘉泰姆	4.5zRd嘉泰姆	24zRd嘉泰姆	340zRd嘉泰姆	0.925zRd嘉泰姆	110zRd嘉泰姆	110zRd嘉泰姆	1900zRd嘉泰姆
CXSD62135zRd嘉泰姆	SOP-8PzRd嘉泰姆	CMzRd嘉泰姆	1zRd嘉泰姆	3zRd嘉泰姆	4.5zRd嘉泰姆	24zRd嘉泰姆	340zRd嘉泰姆	0.925zRd嘉泰姆	110zRd嘉泰姆	110zRd嘉泰姆	1900zRd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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