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：178

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

一,产品概述(General Description) jVr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.jVr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.jVr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.jVr嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.jVr嘉泰姆
二.产品特点(Features)jVr嘉泰姆
Wide Input Voltage from 4.5V to 24VjVr嘉泰姆
3A Continuous Output CurrentjVr嘉泰姆
Adjustable Output Voltage from 0.925V to 20VjVr嘉泰姆
Intergrated High/Low Side MOSFETjVr嘉泰姆
PFM/PWM mode OperationjVr嘉泰姆
Fixed 340kHz Switching FrequencyjVr嘉泰姆
Stable with Low ESR Ceramic Output CapacitorsjVr嘉泰姆
Power-On-Reset DetectionjVr嘉泰姆
Programmable Soft-StartjVr嘉泰姆
Over-Temperature ProtectionjVr嘉泰姆
Current-Limit Protection with Frequency FoldbackjVr嘉泰姆
Enable/Shutdown FunctionjVr嘉泰姆
Small SOP-8P PackagejVr嘉泰姆
Lead Free and Green Devices AvailablejVr嘉泰姆
(RoHS CompliantjVr嘉泰姆
三,应用范围 (Applications)jVr嘉泰姆

LCD Monitor/TVjVr嘉泰姆

Set-Top BoxjVr嘉泰姆
DSL, Switch HUBjVr嘉泰姆
Notebook ComputerjVr嘉泰姆

四.下载产品资料PDF文档 jVr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！jVr嘉泰姆

QQ截图20160419174301.jpg jVr嘉泰姆

jVr嘉泰姆

五,产品封装图 (Package)jVr嘉泰姆

jVr嘉泰姆

六.电路原理图jVr嘉泰姆

jVr嘉泰姆

七,功能概述jVr嘉泰姆

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

Switching Regulator > Buck ConverterjVr嘉泰姆
Part_No jVr嘉泰姆	PackagejVr嘉泰姆	ArchitectujVr嘉泰姆	No.ofjVr嘉泰姆 PWM jVr嘉泰姆 OutpujVr嘉泰姆	DrivejVr嘉泰姆 LoutjVr嘉泰姆 (A) jVr嘉泰姆	Vin(V) jVr嘉泰姆		FmaxjVr嘉泰姆 Khz jVr嘉泰姆	Vref jVr嘉泰姆 (V) jVr嘉泰姆	R-Top (milohm) jVr嘉泰姆	R-Sync (milohm) jVr嘉泰姆	Iq (No load) (uA) jVr嘉泰姆
Part_No jVr嘉泰姆	PackagejVr嘉泰姆	ArchitectujVr嘉泰姆	No.ofjVr嘉泰姆 PWM jVr嘉泰姆 OutpujVr嘉泰姆	DrivejVr嘉泰姆 LoutjVr嘉泰姆 (A) jVr嘉泰姆	minjVr嘉泰姆	maxjVr嘉泰姆	FmaxjVr嘉泰姆 Khz jVr嘉泰姆	Vref jVr嘉泰姆 (V) jVr嘉泰姆	R-Top (milohm) jVr嘉泰姆	R-Sync (milohm) jVr嘉泰姆	Iq (No load) (uA) jVr嘉泰姆
CXSD62122jVr嘉泰姆	TQFN5x6-28jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	5jVr嘉泰姆	4.5jVr嘉泰姆	26jVr嘉泰姆	380jVr嘉泰姆	0.8jVr嘉泰姆	50jVr嘉泰姆	20jVr嘉泰姆	1000jVr嘉泰姆
CXSD62123jVr嘉泰姆	SOP-8jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	2jVr嘉泰姆	4.5jVr嘉泰姆	26jVr嘉泰姆	380jVr嘉泰姆	0.8jVr嘉泰姆	100jVr嘉泰姆		1000jVr嘉泰姆
CXSD62124jVr嘉泰姆	SOP-8PjVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	4jVr嘉泰姆	4.5jVr嘉泰姆	26jVr嘉泰姆	380jVr嘉泰姆	0.8jVr嘉泰姆	80jVr嘉泰姆		1000jVr嘉泰姆
CXSD62125jVr嘉泰姆	SOT23-5\|TSOT23-5jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆	25jVr嘉泰姆
CXSD62125AjVr嘉泰姆	SOT23-5jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆
CXSD62126jVr嘉泰姆	SOP-8jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	3jVr嘉泰姆	4.3jVr嘉泰姆	14jVr嘉泰姆	500jVr嘉泰姆	0.8jVr嘉泰姆	70jVr嘉泰姆	70jVr嘉泰姆	500jVr嘉泰姆
CXSD62127jVr嘉泰姆	SOP-8PjVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	3jVr嘉泰姆	4.3jVr嘉泰姆	14jVr嘉泰姆	500jVr嘉泰姆	0.8jVr嘉泰姆	55jVr嘉泰姆	45jVr嘉泰姆	500jVr嘉泰姆
CXSD62128BjVr嘉泰姆	TDFN3x3-10jVr嘉泰姆			3jVr嘉泰姆	2.6jVr嘉泰姆	5.5jVr嘉泰姆	2000jVr嘉泰姆	0.8jVr嘉泰姆	110jVr嘉泰姆	110jVr嘉泰姆	460jVr嘉泰姆
CXSD62129jVr嘉泰姆	TDFN3x3-10jVr嘉泰姆	CMjVr嘉泰姆	2jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆	500jVr嘉泰姆
CXSD62129AjVr嘉泰姆	TDFN3x3-10jVr嘉泰姆	CMjVr嘉泰姆	2jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆
CXSD62130jVr嘉泰姆	TDFN2x2-6jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆	25jVr嘉泰姆
CXSD62130AjVr嘉泰姆	TDFN2x2-6jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆
CXSD62131jVr嘉泰姆	TDFN3x3-12jVr嘉泰姆	CMjVr嘉泰姆	2jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆	25jVr嘉泰姆
CXSD62131AjVr嘉泰姆	TDFN3x3-12jVr嘉泰姆	CMjVr嘉泰姆	2jVr嘉泰姆	1jVr嘉泰姆	2.7jVr嘉泰姆	6jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆
CXSD62131CjVr嘉泰姆	TDFN 3x3 12jVr嘉泰姆	CMjVr嘉泰姆	2jVr嘉泰姆	1jVr嘉泰姆	3jVr嘉泰姆	5.5jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆	30jVr嘉泰姆
CXSD62132jVr嘉泰姆	TQFN3x3-20jVr嘉泰姆	CMjVr嘉泰姆	3jVr嘉泰姆	2jVr嘉泰姆	2.9jVr嘉泰姆	5.5jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	-jVr嘉泰姆	-jVr嘉泰姆	300jVr嘉泰姆
CXSD62133jVr嘉泰姆	TDFN2x2-8jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	1jVr嘉泰姆	3.3jVr嘉泰姆	8jVr嘉泰姆	1500jVr嘉泰姆	0.6jVr嘉泰姆	280jVr嘉泰姆	250jVr嘉泰姆	25jVr嘉泰姆
CXSD62134jVr嘉泰姆	SOP-8jVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	2jVr嘉泰姆	4.5jVr嘉泰姆	24jVr嘉泰姆	340jVr嘉泰姆	0.925jVr嘉泰姆	110jVr嘉泰姆	110jVr嘉泰姆	1900jVr嘉泰姆
CXSD62135jVr嘉泰姆	SOP-8PjVr嘉泰姆	CMjVr嘉泰姆	1jVr嘉泰姆	3jVr嘉泰姆	4.5jVr嘉泰姆	24jVr嘉泰姆	340jVr嘉泰姆	0.925jVr嘉泰姆	110jVr嘉泰姆	110jVr嘉泰姆	1900jVr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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