CXSD62147 PFM/PWM模式操作固定340kHz开关频率低ESR陶瓷输出电容稳定

发表时间：2020-04-28浏览次数：17

1.产品概述         2.产品特点CW2嘉泰姆
3.应用范围       4.下载产品资料PDF文档 CW2嘉泰姆
5.产品封装图                     6.电路原理图             CW2嘉泰姆
7.功能概述       8.相关产品CW2嘉泰姆

一,产品概述(General Description) CW2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.CW2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.CW2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.CW2嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.CW2嘉泰姆
二.产品特点(Features)CW2嘉泰姆
Wide Input Voltage from 4.5V to 24VCW2嘉泰姆
3A Continuous Output CurrentCW2嘉泰姆
Adjustable Output Voltage from 0.925V to 20VCW2嘉泰姆
Intergrated High/Low Side MOSFETCW2嘉泰姆
PFM/PWM mode OperationCW2嘉泰姆
Fixed 340kHz Switching FrequencyCW2嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsCW2嘉泰姆
Power-On-Reset DetectionCW2嘉泰姆
Programmable Soft-StartCW2嘉泰姆
Over-Temperature ProtectionCW2嘉泰姆
Current-Limit Protection with Frequency FoldbackCW2嘉泰姆
Enable/Shutdown FunctionCW2嘉泰姆
Small SOP-8P PackageCW2嘉泰姆
Lead Free and Green Devices AvailableCW2嘉泰姆
(RoHS CompliantCW2嘉泰姆
三,应用范围 (Applications)CW2嘉泰姆

LCD Monitor/TVCW2嘉泰姆

Set-Top BoxCW2嘉泰姆
DSL, Switch HUBCW2嘉泰姆
Notebook ComputerCW2嘉泰姆

四.下载产品资料PDF文档 CW2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！CW2嘉泰姆

QQ截图20160419174301.jpg CW2嘉泰姆

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五,产品封装图 (Package)CW2嘉泰姆

CW2嘉泰姆

六.电路原理图CW2嘉泰姆

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七,功能概述CW2嘉泰姆

Main Control LoopCW2嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-CW2嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldCW2嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPCW2嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifierCW2嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputCW2嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toCW2嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currentCW2嘉泰姆
matches the new load current.CW2嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage LockoutCW2嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur whenCW2嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdCW2嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.CW2嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5VCW2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 ENCW2嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputCW2嘉泰姆
voltage to the setting of output voltage.CW2嘉泰姆
Over-Temperature Protection (OTP)CW2嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-CW2嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermalCW2嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctionCW2嘉泰姆
temperature cools by 50oC.CW2嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,CW2嘉泰姆
increasing life time of the IC.CW2嘉泰姆
Enable/ShutdownCW2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.CW2嘉泰姆
Current-Limit ProtectionCW2嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits theCW2嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.CW2嘉泰姆
Frequency FoldbackCW2嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofCW2嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,CW2嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackCW2嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.CW2嘉泰姆
Over-Voltage ProtectionCW2嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of theCW2嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driverCW2嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsCW2嘉泰姆
normal operation.CW2嘉泰姆
八,相关产品 更多同类产品.......CW2嘉泰姆

Switching Regulator > Buck ConverterCW2嘉泰姆
Part_No CW2嘉泰姆	PackageCW2嘉泰姆	ArchitectuCW2嘉泰姆	No.ofCW2嘉泰姆 PWM CW2嘉泰姆 OutpuCW2嘉泰姆	DriveCW2嘉泰姆 LoutCW2嘉泰姆 (A) CW2嘉泰姆	Vin(V) CW2嘉泰姆		FmaxCW2嘉泰姆 Khz CW2嘉泰姆	Vref CW2嘉泰姆 (V) CW2嘉泰姆	R-Top (milohm) CW2嘉泰姆	R-Sync (milohm) CW2嘉泰姆	Iq (No load) (uA) CW2嘉泰姆
Part_No CW2嘉泰姆	PackageCW2嘉泰姆	ArchitectuCW2嘉泰姆	No.ofCW2嘉泰姆 PWM CW2嘉泰姆 OutpuCW2嘉泰姆	DriveCW2嘉泰姆 LoutCW2嘉泰姆 (A) CW2嘉泰姆	minCW2嘉泰姆	maxCW2嘉泰姆	FmaxCW2嘉泰姆 Khz CW2嘉泰姆	Vref CW2嘉泰姆 (V) CW2嘉泰姆	R-Top (milohm) CW2嘉泰姆	R-Sync (milohm) CW2嘉泰姆	Iq (No load) (uA) CW2嘉泰姆
CXSD62122CW2嘉泰姆	TQFN5x6-28CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	5CW2嘉泰姆	4.5CW2嘉泰姆	26CW2嘉泰姆	380CW2嘉泰姆	0.8CW2嘉泰姆	50CW2嘉泰姆	20CW2嘉泰姆	1000CW2嘉泰姆
CXSD62123CW2嘉泰姆	SOP-8CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	2CW2嘉泰姆	4.5CW2嘉泰姆	26CW2嘉泰姆	380CW2嘉泰姆	0.8CW2嘉泰姆	100CW2嘉泰姆		1000CW2嘉泰姆
CXSD62124CW2嘉泰姆	SOP-8PCW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	4CW2嘉泰姆	4.5CW2嘉泰姆	26CW2嘉泰姆	380CW2嘉泰姆	0.8CW2嘉泰姆	80CW2嘉泰姆		1000CW2嘉泰姆
CXSD62125CW2嘉泰姆	SOT23-5\|TSOT23-5CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆	25CW2嘉泰姆
CXSD62125ACW2嘉泰姆	SOT23-5CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆
CXSD62126CW2嘉泰姆	SOP-8CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	3CW2嘉泰姆	4.3CW2嘉泰姆	14CW2嘉泰姆	500CW2嘉泰姆	0.8CW2嘉泰姆	70CW2嘉泰姆	70CW2嘉泰姆	500CW2嘉泰姆
CXSD62127CW2嘉泰姆	SOP-8PCW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	3CW2嘉泰姆	4.3CW2嘉泰姆	14CW2嘉泰姆	500CW2嘉泰姆	0.8CW2嘉泰姆	55CW2嘉泰姆	45CW2嘉泰姆	500CW2嘉泰姆
CXSD62128BCW2嘉泰姆	TDFN3x3-10CW2嘉泰姆			3CW2嘉泰姆	2.6CW2嘉泰姆	5.5CW2嘉泰姆	2000CW2嘉泰姆	0.8CW2嘉泰姆	110CW2嘉泰姆	110CW2嘉泰姆	460CW2嘉泰姆
CXSD62129CW2嘉泰姆	TDFN3x3-10CW2嘉泰姆	CMCW2嘉泰姆	2CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆	500CW2嘉泰姆
CXSD62129ACW2嘉泰姆	TDFN3x3-10CW2嘉泰姆	CMCW2嘉泰姆	2CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆
CXSD62130CW2嘉泰姆	TDFN2x2-6CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆	25CW2嘉泰姆
CXSD62130ACW2嘉泰姆	TDFN2x2-6CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆
CXSD62131CW2嘉泰姆	TDFN3x3-12CW2嘉泰姆	CMCW2嘉泰姆	2CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆	25CW2嘉泰姆
CXSD62131ACW2嘉泰姆	TDFN3x3-12CW2嘉泰姆	CMCW2嘉泰姆	2CW2嘉泰姆	1CW2嘉泰姆	2.7CW2嘉泰姆	6CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆
CXSD62131CCW2嘉泰姆	TDFN 3x3 12CW2嘉泰姆	CMCW2嘉泰姆	2CW2嘉泰姆	1CW2嘉泰姆	3CW2嘉泰姆	5.5CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆	30CW2嘉泰姆
CXSD62132CW2嘉泰姆	TQFN3x3-20CW2嘉泰姆	CMCW2嘉泰姆	3CW2嘉泰姆	2CW2嘉泰姆	2.9CW2嘉泰姆	5.5CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	-CW2嘉泰姆	-CW2嘉泰姆	300CW2嘉泰姆
CXSD62133CW2嘉泰姆	TDFN2x2-8CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	1CW2嘉泰姆	3.3CW2嘉泰姆	8CW2嘉泰姆	1500CW2嘉泰姆	0.6CW2嘉泰姆	280CW2嘉泰姆	250CW2嘉泰姆	25CW2嘉泰姆
CXSD62134CW2嘉泰姆	SOP-8CW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	2CW2嘉泰姆	4.5CW2嘉泰姆	24CW2嘉泰姆	340CW2嘉泰姆	0.925CW2嘉泰姆	110CW2嘉泰姆	110CW2嘉泰姆	1900CW2嘉泰姆
CXSD62135CW2嘉泰姆	SOP-8PCW2嘉泰姆	CMCW2嘉泰姆	1CW2嘉泰姆	3CW2嘉泰姆	4.5CW2嘉泰姆	24CW2嘉泰姆	340CW2嘉泰姆	0.925CW2嘉泰姆	110CW2嘉泰姆	110CW2嘉泰姆	1900CW2嘉泰姆

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