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

发表时间：2020-04-28浏览次数：12

1.产品概述         2.产品特点tg3嘉泰姆
3.应用范围       4.下载产品资料PDF文档 tg3嘉泰姆
5.产品封装图                     6.电路原理图             tg3嘉泰姆
7.功能概述       8.相关产品tg3嘉泰姆

一,产品概述(General Description) tg3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.tg3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.tg3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.tg3嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.tg3嘉泰姆
二.产品特点(Features)tg3嘉泰姆
Wide Input Voltage from 4.5V to 24Vtg3嘉泰姆
3A Continuous Output Currenttg3嘉泰姆
Adjustable Output Voltage from 0.925V to 20Vtg3嘉泰姆
Intergrated High/Low Side MOSFETtg3嘉泰姆
PFM/PWM mode Operationtg3嘉泰姆
Fixed 340kHz Switching Frequencytg3嘉泰姆
Stable with Low ESR Ceramic Output Capacitorstg3嘉泰姆
Power-On-Reset Detectiontg3嘉泰姆
Programmable Soft-Starttg3嘉泰姆
Over-Temperature Protectiontg3嘉泰姆
Current-Limit Protection with Frequency Foldbacktg3嘉泰姆
Enable/Shutdown Functiontg3嘉泰姆
Small SOP-8P Packagetg3嘉泰姆
Lead Free and Green Devices Availabletg3嘉泰姆
(RoHS Complianttg3嘉泰姆
三,应用范围 (Applications)tg3嘉泰姆

LCD Monitor/TVtg3嘉泰姆

Set-Top Boxtg3嘉泰姆
DSL, Switch HUBtg3嘉泰姆
Notebook Computertg3嘉泰姆

四.下载产品资料PDF文档 tg3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！tg3嘉泰姆

QQ截图20160419174301.jpg tg3嘉泰姆

tg3嘉泰姆

五,产品封装图 (Package)tg3嘉泰姆

tg3嘉泰姆

六.电路原理图tg3嘉泰姆

tg3嘉泰姆

七,功能概述tg3嘉泰姆

Main Control Looptg3嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-tg3嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldtg3嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPtg3嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifiertg3嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputtg3嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative totg3嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currenttg3嘉泰姆
matches the new load current.tg3嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage Lockouttg3嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur whentg3嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdtg3嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.tg3嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5Vtg3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 ENtg3嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputtg3嘉泰姆
voltage to the setting of output voltage.tg3嘉泰姆
Over-Temperature Protection (OTP)tg3嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-tg3嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermaltg3嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctiontg3嘉泰姆
temperature cools by 50oC.tg3嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,tg3嘉泰姆
increasing life time of the IC.tg3嘉泰姆
Enable/Shutdowntg3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.tg3嘉泰姆
Current-Limit Protectiontg3嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits thetg3嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.tg3嘉泰姆
Frequency Foldbacktg3嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency oftg3嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,tg3嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbacktg3嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.tg3嘉泰姆
Over-Voltage Protectiontg3嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of thetg3嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate drivertg3嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itstg3嘉泰姆
normal operation.tg3嘉泰姆
八,相关产品 更多同类产品.......tg3嘉泰姆

Switching Regulator > Buck Convertertg3嘉泰姆
Part_No tg3嘉泰姆	Packagetg3嘉泰姆	Architectutg3嘉泰姆	No.oftg3嘉泰姆 PWM tg3嘉泰姆 Outputg3嘉泰姆	Drivetg3嘉泰姆 Louttg3嘉泰姆 (A) tg3嘉泰姆	Vin(V) tg3嘉泰姆		Fmaxtg3嘉泰姆 Khz tg3嘉泰姆	Vref tg3嘉泰姆 (V) tg3嘉泰姆	R-Top (milohm) tg3嘉泰姆	R-Sync (milohm) tg3嘉泰姆	Iq (No load) (uA) tg3嘉泰姆
Part_No tg3嘉泰姆	Packagetg3嘉泰姆	Architectutg3嘉泰姆	No.oftg3嘉泰姆 PWM tg3嘉泰姆 Outputg3嘉泰姆	Drivetg3嘉泰姆 Louttg3嘉泰姆 (A) tg3嘉泰姆	mintg3嘉泰姆	maxtg3嘉泰姆	Fmaxtg3嘉泰姆 Khz tg3嘉泰姆	Vref tg3嘉泰姆 (V) tg3嘉泰姆	R-Top (milohm) tg3嘉泰姆	R-Sync (milohm) tg3嘉泰姆	Iq (No load) (uA) tg3嘉泰姆
CXSD62122tg3嘉泰姆	TQFN5x6-28tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	5tg3嘉泰姆	4.5tg3嘉泰姆	26tg3嘉泰姆	380tg3嘉泰姆	0.8tg3嘉泰姆	50tg3嘉泰姆	20tg3嘉泰姆	1000tg3嘉泰姆
CXSD62123tg3嘉泰姆	SOP-8tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	2tg3嘉泰姆	4.5tg3嘉泰姆	26tg3嘉泰姆	380tg3嘉泰姆	0.8tg3嘉泰姆	100tg3嘉泰姆		1000tg3嘉泰姆
CXSD62124tg3嘉泰姆	SOP-8Ptg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	4tg3嘉泰姆	4.5tg3嘉泰姆	26tg3嘉泰姆	380tg3嘉泰姆	0.8tg3嘉泰姆	80tg3嘉泰姆		1000tg3嘉泰姆
CXSD62125tg3嘉泰姆	SOT23-5\|TSOT23-5tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆	25tg3嘉泰姆
CXSD62125Atg3嘉泰姆	SOT23-5tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆
CXSD62126tg3嘉泰姆	SOP-8tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	3tg3嘉泰姆	4.3tg3嘉泰姆	14tg3嘉泰姆	500tg3嘉泰姆	0.8tg3嘉泰姆	70tg3嘉泰姆	70tg3嘉泰姆	500tg3嘉泰姆
CXSD62127tg3嘉泰姆	SOP-8Ptg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	3tg3嘉泰姆	4.3tg3嘉泰姆	14tg3嘉泰姆	500tg3嘉泰姆	0.8tg3嘉泰姆	55tg3嘉泰姆	45tg3嘉泰姆	500tg3嘉泰姆
CXSD62128Btg3嘉泰姆	TDFN3x3-10tg3嘉泰姆			3tg3嘉泰姆	2.6tg3嘉泰姆	5.5tg3嘉泰姆	2000tg3嘉泰姆	0.8tg3嘉泰姆	110tg3嘉泰姆	110tg3嘉泰姆	460tg3嘉泰姆
CXSD62129tg3嘉泰姆	TDFN3x3-10tg3嘉泰姆	CMtg3嘉泰姆	2tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆	500tg3嘉泰姆
CXSD62129Atg3嘉泰姆	TDFN3x3-10tg3嘉泰姆	CMtg3嘉泰姆	2tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆
CXSD62130tg3嘉泰姆	TDFN2x2-6tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆	25tg3嘉泰姆
CXSD62130Atg3嘉泰姆	TDFN2x2-6tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆
CXSD62131tg3嘉泰姆	TDFN3x3-12tg3嘉泰姆	CMtg3嘉泰姆	2tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆	25tg3嘉泰姆
CXSD62131Atg3嘉泰姆	TDFN3x3-12tg3嘉泰姆	CMtg3嘉泰姆	2tg3嘉泰姆	1tg3嘉泰姆	2.7tg3嘉泰姆	6tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆
CXSD62131Ctg3嘉泰姆	TDFN 3x3 12tg3嘉泰姆	CMtg3嘉泰姆	2tg3嘉泰姆	1tg3嘉泰姆	3tg3嘉泰姆	5.5tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆	30tg3嘉泰姆
CXSD62132tg3嘉泰姆	TQFN3x3-20tg3嘉泰姆	CMtg3嘉泰姆	3tg3嘉泰姆	2tg3嘉泰姆	2.9tg3嘉泰姆	5.5tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	-tg3嘉泰姆	-tg3嘉泰姆	300tg3嘉泰姆
CXSD62133tg3嘉泰姆	TDFN2x2-8tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	1tg3嘉泰姆	3.3tg3嘉泰姆	8tg3嘉泰姆	1500tg3嘉泰姆	0.6tg3嘉泰姆	280tg3嘉泰姆	250tg3嘉泰姆	25tg3嘉泰姆
CXSD62134tg3嘉泰姆	SOP-8tg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	2tg3嘉泰姆	4.5tg3嘉泰姆	24tg3嘉泰姆	340tg3嘉泰姆	0.925tg3嘉泰姆	110tg3嘉泰姆	110tg3嘉泰姆	1900tg3嘉泰姆
CXSD62135tg3嘉泰姆	SOP-8Ptg3嘉泰姆	CMtg3嘉泰姆	1tg3嘉泰姆	3tg3嘉泰姆	4.5tg3嘉泰姆	24tg3嘉泰姆	340tg3嘉泰姆	0.925tg3嘉泰姆	110tg3嘉泰姆	110tg3嘉泰姆	1900tg3嘉泰姆

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