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：307

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i2i嘉泰姆
3.应用范围       4.下载产品资料PDF文档 i2i嘉泰姆
5.产品封装图                     6.电路原理图             i2i嘉泰姆
7.功能概述       8.相关产品i2i嘉泰姆

一,产品概述(General Description) i2i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.i2i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.i2i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.i2i嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.i2i嘉泰姆
二.产品特点(Features)i2i嘉泰姆
Wide Input Voltage from 4.5V to 24Vi2i嘉泰姆
3A Continuous Output Currenti2i嘉泰姆
Adjustable Output Voltage from 0.925V to 20Vi2i嘉泰姆
Intergrated High/Low Side MOSFETi2i嘉泰姆
PFM/PWM mode Operationi2i嘉泰姆
Fixed 340kHz Switching Frequencyi2i嘉泰姆
Stable with Low ESR Ceramic Output Capacitorsi2i嘉泰姆
Power-On-Reset Detectioni2i嘉泰姆
Programmable Soft-Starti2i嘉泰姆
Over-Temperature Protectioni2i嘉泰姆
Current-Limit Protection with Frequency Foldbacki2i嘉泰姆
Enable/Shutdown Functioni2i嘉泰姆
Small SOP-8P Packagei2i嘉泰姆
Lead Free and Green Devices Availablei2i嘉泰姆
(RoHS Complianti2i嘉泰姆
三,应用范围 (Applications)i2i嘉泰姆

LCD Monitor/TVi2i嘉泰姆

Set-Top Boxi2i嘉泰姆
DSL, Switch HUBi2i嘉泰姆
Notebook Computeri2i嘉泰姆

四.下载产品资料PDF文档 i2i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！i2i嘉泰姆

QQ截图20160419174301.jpg i2i嘉泰姆

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五,产品封装图 (Package)i2i嘉泰姆

i2i嘉泰姆

六.电路原理图i2i嘉泰姆

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七,功能概述i2i嘉泰姆

Main Control Loopi2i嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-i2i嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and wouldi2i嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMPi2i嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifieri2i嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an outputi2i嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative toi2i嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor currenti2i嘉泰姆
matches the new load current.i2i嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage Lockouti2i嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur wheni2i嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising thresholdi2i嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.i2i嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5Vi2i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 ENi2i嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the outputi2i嘉泰姆
voltage to the setting of output voltage.i2i嘉泰姆
Over-Temperature Protection (OTP)i2i嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-i2i嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermali2i嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junctioni2i嘉泰姆
temperature cools by 50oC.i2i嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,i2i嘉泰姆
increasing life time of the IC.i2i嘉泰姆
Enable/Shutdowni2i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.i2i嘉泰姆
Current-Limit Protectioni2i嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits thei2i嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.i2i嘉泰姆
Frequency Foldbacki2i嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency ofi2i嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,i2i嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedbacki2i嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.i2i嘉泰姆
Over-Voltage Protectioni2i嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of thei2i嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driveri2i嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore itsi2i嘉泰姆
normal operation.i2i嘉泰姆
八,相关产品 更多同类产品.......i2i嘉泰姆

Switching Regulator > Buck Converteri2i嘉泰姆
Part_No i2i嘉泰姆	Packagei2i嘉泰姆	Architectui2i嘉泰姆	No.ofi2i嘉泰姆 PWM i2i嘉泰姆 Outpui2i嘉泰姆	Drivei2i嘉泰姆 Louti2i嘉泰姆 (A) i2i嘉泰姆	Vin(V) i2i嘉泰姆		Fmaxi2i嘉泰姆 Khz i2i嘉泰姆	Vref i2i嘉泰姆 (V) i2i嘉泰姆	R-Top (milohm) i2i嘉泰姆	R-Sync (milohm) i2i嘉泰姆	Iq (No load) (uA) i2i嘉泰姆
Part_No i2i嘉泰姆	Packagei2i嘉泰姆	Architectui2i嘉泰姆	No.ofi2i嘉泰姆 PWM i2i嘉泰姆 Outpui2i嘉泰姆	Drivei2i嘉泰姆 Louti2i嘉泰姆 (A) i2i嘉泰姆	mini2i嘉泰姆	maxi2i嘉泰姆	Fmaxi2i嘉泰姆 Khz i2i嘉泰姆	Vref i2i嘉泰姆 (V) i2i嘉泰姆	R-Top (milohm) i2i嘉泰姆	R-Sync (milohm) i2i嘉泰姆	Iq (No load) (uA) i2i嘉泰姆
CXSD62122i2i嘉泰姆	TQFN5x6-28i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	5i2i嘉泰姆	4.5i2i嘉泰姆	26i2i嘉泰姆	380i2i嘉泰姆	0.8i2i嘉泰姆	50i2i嘉泰姆	20i2i嘉泰姆	1000i2i嘉泰姆
CXSD62123i2i嘉泰姆	SOP-8i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	2i2i嘉泰姆	4.5i2i嘉泰姆	26i2i嘉泰姆	380i2i嘉泰姆	0.8i2i嘉泰姆	100i2i嘉泰姆		1000i2i嘉泰姆
CXSD62124i2i嘉泰姆	SOP-8Pi2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	4i2i嘉泰姆	4.5i2i嘉泰姆	26i2i嘉泰姆	380i2i嘉泰姆	0.8i2i嘉泰姆	80i2i嘉泰姆		1000i2i嘉泰姆
CXSD62125i2i嘉泰姆	SOT23-5\|TSOT23-5i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆	25i2i嘉泰姆
CXSD62125Ai2i嘉泰姆	SOT23-5i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆
CXSD62126i2i嘉泰姆	SOP-8i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	3i2i嘉泰姆	4.3i2i嘉泰姆	14i2i嘉泰姆	500i2i嘉泰姆	0.8i2i嘉泰姆	70i2i嘉泰姆	70i2i嘉泰姆	500i2i嘉泰姆
CXSD62127i2i嘉泰姆	SOP-8Pi2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	3i2i嘉泰姆	4.3i2i嘉泰姆	14i2i嘉泰姆	500i2i嘉泰姆	0.8i2i嘉泰姆	55i2i嘉泰姆	45i2i嘉泰姆	500i2i嘉泰姆
CXSD62128Bi2i嘉泰姆	TDFN3x3-10i2i嘉泰姆			3i2i嘉泰姆	2.6i2i嘉泰姆	5.5i2i嘉泰姆	2000i2i嘉泰姆	0.8i2i嘉泰姆	110i2i嘉泰姆	110i2i嘉泰姆	460i2i嘉泰姆
CXSD62129i2i嘉泰姆	TDFN3x3-10i2i嘉泰姆	CMi2i嘉泰姆	2i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆	500i2i嘉泰姆
CXSD62129Ai2i嘉泰姆	TDFN3x3-10i2i嘉泰姆	CMi2i嘉泰姆	2i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆
CXSD62130i2i嘉泰姆	TDFN2x2-6i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆	25i2i嘉泰姆
CXSD62130Ai2i嘉泰姆	TDFN2x2-6i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆
CXSD62131i2i嘉泰姆	TDFN3x3-12i2i嘉泰姆	CMi2i嘉泰姆	2i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆	25i2i嘉泰姆
CXSD62131Ai2i嘉泰姆	TDFN3x3-12i2i嘉泰姆	CMi2i嘉泰姆	2i2i嘉泰姆	1i2i嘉泰姆	2.7i2i嘉泰姆	6i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆
CXSD62131Ci2i嘉泰姆	TDFN 3x3 12i2i嘉泰姆	CMi2i嘉泰姆	2i2i嘉泰姆	1i2i嘉泰姆	3i2i嘉泰姆	5.5i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆	30i2i嘉泰姆
CXSD62132i2i嘉泰姆	TQFN3x3-20i2i嘉泰姆	CMi2i嘉泰姆	3i2i嘉泰姆	2i2i嘉泰姆	2.9i2i嘉泰姆	5.5i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	-i2i嘉泰姆	-i2i嘉泰姆	300i2i嘉泰姆
CXSD62133i2i嘉泰姆	TDFN2x2-8i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	1i2i嘉泰姆	3.3i2i嘉泰姆	8i2i嘉泰姆	1500i2i嘉泰姆	0.6i2i嘉泰姆	280i2i嘉泰姆	250i2i嘉泰姆	25i2i嘉泰姆
CXSD62134i2i嘉泰姆	SOP-8i2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	2i2i嘉泰姆	4.5i2i嘉泰姆	24i2i嘉泰姆	340i2i嘉泰姆	0.925i2i嘉泰姆	110i2i嘉泰姆	110i2i嘉泰姆	1900i2i嘉泰姆
CXSD62135i2i嘉泰姆	SOP-8Pi2i嘉泰姆	CMi2i嘉泰姆	1i2i嘉泰姆	3i2i嘉泰姆	4.5i2i嘉泰姆	24i2i嘉泰姆	340i2i嘉泰姆	0.925i2i嘉泰姆	110i2i嘉泰姆	110i2i嘉泰姆	1900i2i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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