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：57

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A81嘉泰姆
3.应用范围       4.下载产品资料PDF文档 A81嘉泰姆
5.产品封装图                     6.电路原理图             A81嘉泰姆
7.功能概述       8.相关产品A81嘉泰姆

一,产品概述(General Description) A81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.A81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.A81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.A81嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.A81嘉泰姆
二.产品特点(Features)A81嘉泰姆
Wide Input Voltage from 4.5V to 24VA81嘉泰姆
3A Continuous Output CurrentA81嘉泰姆
Adjustable Output Voltage from 0.925V to 20VA81嘉泰姆
Intergrated High/Low Side MOSFETA81嘉泰姆
PFM/PWM mode OperationA81嘉泰姆
Fixed 340kHz Switching FrequencyA81嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsA81嘉泰姆
Power-On-Reset DetectionA81嘉泰姆
Programmable Soft-StartA81嘉泰姆
Over-Temperature ProtectionA81嘉泰姆
Current-Limit Protection with Frequency FoldbackA81嘉泰姆
Enable/Shutdown FunctionA81嘉泰姆
Small SOP-8P PackageA81嘉泰姆
Lead Free and Green Devices AvailableA81嘉泰姆
(RoHS CompliantA81嘉泰姆
三,应用范围 (Applications)A81嘉泰姆

LCD Monitor/TVA81嘉泰姆

Set-Top BoxA81嘉泰姆
DSL, Switch HUBA81嘉泰姆
Notebook ComputerA81嘉泰姆

四.下载产品资料PDF文档 A81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！A81嘉泰姆

QQ截图20160419174301.jpg A81嘉泰姆

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五,产品封装图 (Package)A81嘉泰姆

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六.电路原理图A81嘉泰姆

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七,功能概述A81嘉泰姆

Main Control LoopA81嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-A81嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldA81嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPA81嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifierA81嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputA81嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toA81嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currentA81嘉泰姆
matches the new load current.A81嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage LockoutA81嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur whenA81嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdA81嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.A81嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5VA81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 ENA81嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputA81嘉泰姆
voltage to the setting of output voltage.A81嘉泰姆
Over-Temperature Protection (OTP)A81嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-A81嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermalA81嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctionA81嘉泰姆
temperature cools by 50oC.A81嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,A81嘉泰姆
increasing life time of the IC.A81嘉泰姆
Enable/ShutdownA81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.A81嘉泰姆
Current-Limit ProtectionA81嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits theA81嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.A81嘉泰姆
Frequency FoldbackA81嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofA81嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,A81嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackA81嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.A81嘉泰姆
Over-Voltage ProtectionA81嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of theA81嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driverA81嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsA81嘉泰姆
normal operation.A81嘉泰姆
八,相关产品 更多同类产品.......A81嘉泰姆

Switching Regulator > Buck ConverterA81嘉泰姆
Part_No A81嘉泰姆	PackageA81嘉泰姆	ArchitectuA81嘉泰姆	No.ofA81嘉泰姆 PWM A81嘉泰姆 OutpuA81嘉泰姆	DriveA81嘉泰姆 LoutA81嘉泰姆 (A) A81嘉泰姆	Vin(V) A81嘉泰姆		FmaxA81嘉泰姆 Khz A81嘉泰姆	Vref A81嘉泰姆 (V) A81嘉泰姆	R-Top (milohm) A81嘉泰姆	R-Sync (milohm) A81嘉泰姆	Iq (No load) (uA) A81嘉泰姆
Part_No A81嘉泰姆	PackageA81嘉泰姆	ArchitectuA81嘉泰姆	No.ofA81嘉泰姆 PWM A81嘉泰姆 OutpuA81嘉泰姆	DriveA81嘉泰姆 LoutA81嘉泰姆 (A) A81嘉泰姆	minA81嘉泰姆	maxA81嘉泰姆	FmaxA81嘉泰姆 Khz A81嘉泰姆	Vref A81嘉泰姆 (V) A81嘉泰姆	R-Top (milohm) A81嘉泰姆	R-Sync (milohm) A81嘉泰姆	Iq (No load) (uA) A81嘉泰姆
CXSD62122A81嘉泰姆	TQFN5x6-28A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	5A81嘉泰姆	4.5A81嘉泰姆	26A81嘉泰姆	380A81嘉泰姆	0.8A81嘉泰姆	50A81嘉泰姆	20A81嘉泰姆	1000A81嘉泰姆
CXSD62123A81嘉泰姆	SOP-8A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	2A81嘉泰姆	4.5A81嘉泰姆	26A81嘉泰姆	380A81嘉泰姆	0.8A81嘉泰姆	100A81嘉泰姆		1000A81嘉泰姆
CXSD62124A81嘉泰姆	SOP-8PA81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	4A81嘉泰姆	4.5A81嘉泰姆	26A81嘉泰姆	380A81嘉泰姆	0.8A81嘉泰姆	80A81嘉泰姆		1000A81嘉泰姆
CXSD62125A81嘉泰姆	SOT23-5\|TSOT23-5A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆	25A81嘉泰姆
CXSD62125AA81嘉泰姆	SOT23-5A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆
CXSD62126A81嘉泰姆	SOP-8A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	3A81嘉泰姆	4.3A81嘉泰姆	14A81嘉泰姆	500A81嘉泰姆	0.8A81嘉泰姆	70A81嘉泰姆	70A81嘉泰姆	500A81嘉泰姆
CXSD62127A81嘉泰姆	SOP-8PA81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	3A81嘉泰姆	4.3A81嘉泰姆	14A81嘉泰姆	500A81嘉泰姆	0.8A81嘉泰姆	55A81嘉泰姆	45A81嘉泰姆	500A81嘉泰姆
CXSD62128BA81嘉泰姆	TDFN3x3-10A81嘉泰姆			3A81嘉泰姆	2.6A81嘉泰姆	5.5A81嘉泰姆	2000A81嘉泰姆	0.8A81嘉泰姆	110A81嘉泰姆	110A81嘉泰姆	460A81嘉泰姆
CXSD62129A81嘉泰姆	TDFN3x3-10A81嘉泰姆	CMA81嘉泰姆	2A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆	500A81嘉泰姆
CXSD62129AA81嘉泰姆	TDFN3x3-10A81嘉泰姆	CMA81嘉泰姆	2A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆
CXSD62130A81嘉泰姆	TDFN2x2-6A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆	25A81嘉泰姆
CXSD62130AA81嘉泰姆	TDFN2x2-6A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆
CXSD62131A81嘉泰姆	TDFN3x3-12A81嘉泰姆	CMA81嘉泰姆	2A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆	25A81嘉泰姆
CXSD62131AA81嘉泰姆	TDFN3x3-12A81嘉泰姆	CMA81嘉泰姆	2A81嘉泰姆	1A81嘉泰姆	2.7A81嘉泰姆	6A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆
CXSD62131CA81嘉泰姆	TDFN 3x3 12A81嘉泰姆	CMA81嘉泰姆	2A81嘉泰姆	1A81嘉泰姆	3A81嘉泰姆	5.5A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆	30A81嘉泰姆
CXSD62132A81嘉泰姆	TQFN3x3-20A81嘉泰姆	CMA81嘉泰姆	3A81嘉泰姆	2A81嘉泰姆	2.9A81嘉泰姆	5.5A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	-A81嘉泰姆	-A81嘉泰姆	300A81嘉泰姆
CXSD62133A81嘉泰姆	TDFN2x2-8A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	1A81嘉泰姆	3.3A81嘉泰姆	8A81嘉泰姆	1500A81嘉泰姆	0.6A81嘉泰姆	280A81嘉泰姆	250A81嘉泰姆	25A81嘉泰姆
CXSD62134A81嘉泰姆	SOP-8A81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	2A81嘉泰姆	4.5A81嘉泰姆	24A81嘉泰姆	340A81嘉泰姆	0.925A81嘉泰姆	110A81嘉泰姆	110A81嘉泰姆	1900A81嘉泰姆
CXSD62135A81嘉泰姆	SOP-8PA81嘉泰姆	CMA81嘉泰姆	1A81嘉泰姆	3A81嘉泰姆	4.5A81嘉泰姆	24A81嘉泰姆	340A81嘉泰姆	0.925A81嘉泰姆	110A81嘉泰姆	110A81嘉泰姆	1900A81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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