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：87

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B2d嘉泰姆
3.应用范围       4.下载产品资料PDF文档 B2d嘉泰姆
5.产品封装图                     6.电路原理图             B2d嘉泰姆
7.功能概述       8.相关产品B2d嘉泰姆

一,产品概述(General Description) B2d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.B2d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.B2d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.B2d嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.B2d嘉泰姆
二.产品特点(Features)B2d嘉泰姆
Wide Input Voltage from 4.5V to 24VB2d嘉泰姆
3A Continuous Output CurrentB2d嘉泰姆
Adjustable Output Voltage from 0.925V to 20VB2d嘉泰姆
Intergrated High/Low Side MOSFETB2d嘉泰姆
PFM/PWM mode OperationB2d嘉泰姆
Fixed 340kHz Switching FrequencyB2d嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsB2d嘉泰姆
Power-On-Reset DetectionB2d嘉泰姆
Programmable Soft-StartB2d嘉泰姆
Over-Temperature ProtectionB2d嘉泰姆
Current-Limit Protection with Frequency FoldbackB2d嘉泰姆
Enable/Shutdown FunctionB2d嘉泰姆
Small SOP-8P PackageB2d嘉泰姆
Lead Free and Green Devices AvailableB2d嘉泰姆
(RoHS CompliantB2d嘉泰姆
三,应用范围 (Applications)B2d嘉泰姆

LCD Monitor/TVB2d嘉泰姆

Set-Top BoxB2d嘉泰姆
DSL, Switch HUBB2d嘉泰姆
Notebook ComputerB2d嘉泰姆

四.下载产品资料PDF文档 B2d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！B2d嘉泰姆

QQ截图20160419174301.jpg B2d嘉泰姆

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五,产品封装图 (Package)B2d嘉泰姆

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六.电路原理图B2d嘉泰姆

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七,功能概述B2d嘉泰姆

Main Control LoopB2d嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-B2d嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldB2d嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPB2d嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifierB2d嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputB2d嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toB2d嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currentB2d嘉泰姆
matches the new load current.B2d嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage LockoutB2d嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur whenB2d嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdB2d嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.B2d嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5VB2d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 ENB2d嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputB2d嘉泰姆
voltage to the setting of output voltage.B2d嘉泰姆
Over-Temperature Protection (OTP)B2d嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-B2d嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermalB2d嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctionB2d嘉泰姆
temperature cools by 50oC.B2d嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,B2d嘉泰姆
increasing life time of the IC.B2d嘉泰姆
Enable/ShutdownB2d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.B2d嘉泰姆
Current-Limit ProtectionB2d嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits theB2d嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.B2d嘉泰姆
Frequency FoldbackB2d嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofB2d嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,B2d嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbackB2d嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.B2d嘉泰姆
Over-Voltage ProtectionB2d嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of theB2d嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driverB2d嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsB2d嘉泰姆
normal operation.B2d嘉泰姆
八,相关产品 更多同类产品.......B2d嘉泰姆

Switching Regulator > Buck ConverterB2d嘉泰姆
Part_No B2d嘉泰姆	PackageB2d嘉泰姆	ArchitectuB2d嘉泰姆	No.ofB2d嘉泰姆 PWM B2d嘉泰姆 OutpuB2d嘉泰姆	DriveB2d嘉泰姆 LoutB2d嘉泰姆 (A) B2d嘉泰姆	Vin(V) B2d嘉泰姆		FmaxB2d嘉泰姆 Khz B2d嘉泰姆	Vref B2d嘉泰姆 (V) B2d嘉泰姆	R-Top (milohm) B2d嘉泰姆	R-Sync (milohm) B2d嘉泰姆	Iq (No load) (uA) B2d嘉泰姆
Part_No B2d嘉泰姆	PackageB2d嘉泰姆	ArchitectuB2d嘉泰姆	No.ofB2d嘉泰姆 PWM B2d嘉泰姆 OutpuB2d嘉泰姆	DriveB2d嘉泰姆 LoutB2d嘉泰姆 (A) B2d嘉泰姆	minB2d嘉泰姆	maxB2d嘉泰姆	FmaxB2d嘉泰姆 Khz B2d嘉泰姆	Vref B2d嘉泰姆 (V) B2d嘉泰姆	R-Top (milohm) B2d嘉泰姆	R-Sync (milohm) B2d嘉泰姆	Iq (No load) (uA) B2d嘉泰姆
CXSD62122B2d嘉泰姆	TQFN5x6-28B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	5B2d嘉泰姆	4.5B2d嘉泰姆	26B2d嘉泰姆	380B2d嘉泰姆	0.8B2d嘉泰姆	50B2d嘉泰姆	20B2d嘉泰姆	1000B2d嘉泰姆
CXSD62123B2d嘉泰姆	SOP-8B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	2B2d嘉泰姆	4.5B2d嘉泰姆	26B2d嘉泰姆	380B2d嘉泰姆	0.8B2d嘉泰姆	100B2d嘉泰姆		1000B2d嘉泰姆
CXSD62124B2d嘉泰姆	SOP-8PB2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	4B2d嘉泰姆	4.5B2d嘉泰姆	26B2d嘉泰姆	380B2d嘉泰姆	0.8B2d嘉泰姆	80B2d嘉泰姆		1000B2d嘉泰姆
CXSD62125B2d嘉泰姆	SOT23-5\|TSOT23-5B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆	25B2d嘉泰姆
CXSD62125AB2d嘉泰姆	SOT23-5B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆
CXSD62126B2d嘉泰姆	SOP-8B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	3B2d嘉泰姆	4.3B2d嘉泰姆	14B2d嘉泰姆	500B2d嘉泰姆	0.8B2d嘉泰姆	70B2d嘉泰姆	70B2d嘉泰姆	500B2d嘉泰姆
CXSD62127B2d嘉泰姆	SOP-8PB2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	3B2d嘉泰姆	4.3B2d嘉泰姆	14B2d嘉泰姆	500B2d嘉泰姆	0.8B2d嘉泰姆	55B2d嘉泰姆	45B2d嘉泰姆	500B2d嘉泰姆
CXSD62128BB2d嘉泰姆	TDFN3x3-10B2d嘉泰姆			3B2d嘉泰姆	2.6B2d嘉泰姆	5.5B2d嘉泰姆	2000B2d嘉泰姆	0.8B2d嘉泰姆	110B2d嘉泰姆	110B2d嘉泰姆	460B2d嘉泰姆
CXSD62129B2d嘉泰姆	TDFN3x3-10B2d嘉泰姆	CMB2d嘉泰姆	2B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆	500B2d嘉泰姆
CXSD62129AB2d嘉泰姆	TDFN3x3-10B2d嘉泰姆	CMB2d嘉泰姆	2B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆
CXSD62130B2d嘉泰姆	TDFN2x2-6B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆	25B2d嘉泰姆
CXSD62130AB2d嘉泰姆	TDFN2x2-6B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆
CXSD62131B2d嘉泰姆	TDFN3x3-12B2d嘉泰姆	CMB2d嘉泰姆	2B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆	25B2d嘉泰姆
CXSD62131AB2d嘉泰姆	TDFN3x3-12B2d嘉泰姆	CMB2d嘉泰姆	2B2d嘉泰姆	1B2d嘉泰姆	2.7B2d嘉泰姆	6B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆
CXSD62131CB2d嘉泰姆	TDFN 3x3 12B2d嘉泰姆	CMB2d嘉泰姆	2B2d嘉泰姆	1B2d嘉泰姆	3B2d嘉泰姆	5.5B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆	30B2d嘉泰姆
CXSD62132B2d嘉泰姆	TQFN3x3-20B2d嘉泰姆	CMB2d嘉泰姆	3B2d嘉泰姆	2B2d嘉泰姆	2.9B2d嘉泰姆	5.5B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	-B2d嘉泰姆	-B2d嘉泰姆	300B2d嘉泰姆
CXSD62133B2d嘉泰姆	TDFN2x2-8B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	1B2d嘉泰姆	3.3B2d嘉泰姆	8B2d嘉泰姆	1500B2d嘉泰姆	0.6B2d嘉泰姆	280B2d嘉泰姆	250B2d嘉泰姆	25B2d嘉泰姆
CXSD62134B2d嘉泰姆	SOP-8B2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	2B2d嘉泰姆	4.5B2d嘉泰姆	24B2d嘉泰姆	340B2d嘉泰姆	0.925B2d嘉泰姆	110B2d嘉泰姆	110B2d嘉泰姆	1900B2d嘉泰姆
CXSD62135B2d嘉泰姆	SOP-8PB2d嘉泰姆	CMB2d嘉泰姆	1B2d嘉泰姆	3B2d嘉泰姆	4.5B2d嘉泰姆	24B2d嘉泰姆	340B2d嘉泰姆	0.925B2d嘉泰姆	110B2d嘉泰姆	110B2d嘉泰姆	1900B2d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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