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：298

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0dW嘉泰姆
3.应用范围       4.下载产品资料PDF文档 0dW嘉泰姆
5.产品封装图                     6.电路原理图             0dW嘉泰姆
7.功能概述       8.相关产品0dW嘉泰姆

一,产品概述(General Description) 0dW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.0dW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.0dW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.0dW嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.0dW嘉泰姆
二.产品特点(Features)0dW嘉泰姆
Wide Input Voltage from 4.5V to 24V0dW嘉泰姆
3A Continuous Output Current0dW嘉泰姆
Adjustable Output Voltage from 0.925V to 20V0dW嘉泰姆
Intergrated High/Low Side MOSFET0dW嘉泰姆
PFM/PWM mode Operation0dW嘉泰姆
Fixed 340kHz Switching Frequency0dW嘉泰姆
Stable with Low ESR Ceramic Output Capacitors0dW嘉泰姆
Power-On-Reset Detection0dW嘉泰姆
Programmable Soft-Start0dW嘉泰姆
Over-Temperature Protection0dW嘉泰姆
Current-Limit Protection with Frequency Foldback0dW嘉泰姆
Enable/Shutdown Function0dW嘉泰姆
Small SOP-8P Package0dW嘉泰姆
Lead Free and Green Devices Available0dW嘉泰姆
(RoHS Compliant0dW嘉泰姆
三,应用范围 (Applications)0dW嘉泰姆

LCD Monitor/TV0dW嘉泰姆

Set-Top Box0dW嘉泰姆
DSL, Switch HUB0dW嘉泰姆
Notebook Computer0dW嘉泰姆

四.下载产品资料PDF文档 0dW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！0dW嘉泰姆

QQ截图20160419174301.jpg 0dW嘉泰姆

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五,产品封装图 (Package)0dW嘉泰姆

0dW嘉泰姆

六.电路原理图0dW嘉泰姆

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七,功能概述0dW嘉泰姆

Main Control Loop0dW嘉泰姆
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-0dW嘉泰姆
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and would0dW嘉泰姆
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMP0dW嘉泰姆
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifier0dW嘉泰姆
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an output0dW嘉泰姆
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative to0dW嘉泰姆
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor current0dW嘉泰姆
matches the new load current.0dW嘉泰姆
VIN Power-On-Reset (POR) and EN Under-voltage Lockout0dW嘉泰姆
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur when0dW嘉泰姆
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising threshold0dW嘉泰姆
of 4.05V (typical) with 0.3V of hysteresis.0dW嘉泰姆
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5V0dW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 EN0dW嘉泰姆
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the output0dW嘉泰姆
voltage to the setting of output voltage.0dW嘉泰姆
Over-Temperature Protection (OTP)0dW嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-0dW嘉泰姆
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermal0dW嘉泰姆
sensor allows the converter to start a start-up process and regulate the output voltage again after the junction0dW嘉泰姆
temperature cools by 50oC.0dW嘉泰姆
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,0dW嘉泰姆
increasing life time of the IC.0dW嘉泰姆
Enable/Shutdown0dW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.0dW嘉泰姆
Current-Limit Protection0dW嘉泰姆
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits the0dW嘉泰姆
IC from damages during overload, short-circuit and over-voltage conditions.0dW嘉泰姆
Frequency Foldback0dW嘉泰姆
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency of0dW嘉泰姆
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,0dW嘉泰姆
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedback0dW嘉泰姆
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.0dW嘉泰姆
Over-Voltage Protection0dW嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of the0dW嘉泰姆
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driver0dW嘉泰姆
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore its0dW嘉泰姆
normal operation.0dW嘉泰姆
八,相关产品 更多同类产品.......0dW嘉泰姆

Switching Regulator > Buck Converter0dW嘉泰姆
Part_No 0dW嘉泰姆	Package0dW嘉泰姆	Architectu0dW嘉泰姆	No.of0dW嘉泰姆 PWM 0dW嘉泰姆 Outpu0dW嘉泰姆	Drive0dW嘉泰姆 Lout0dW嘉泰姆 (A) 0dW嘉泰姆	Vin(V) 0dW嘉泰姆		Fmax0dW嘉泰姆 Khz 0dW嘉泰姆	Vref 0dW嘉泰姆 (V) 0dW嘉泰姆	R-Top (milohm) 0dW嘉泰姆	R-Sync (milohm) 0dW嘉泰姆	Iq (No load) (uA) 0dW嘉泰姆
Part_No 0dW嘉泰姆	Package0dW嘉泰姆	Architectu0dW嘉泰姆	No.of0dW嘉泰姆 PWM 0dW嘉泰姆 Outpu0dW嘉泰姆	Drive0dW嘉泰姆 Lout0dW嘉泰姆 (A) 0dW嘉泰姆	min0dW嘉泰姆	max0dW嘉泰姆	Fmax0dW嘉泰姆 Khz 0dW嘉泰姆	Vref 0dW嘉泰姆 (V) 0dW嘉泰姆	R-Top (milohm) 0dW嘉泰姆	R-Sync (milohm) 0dW嘉泰姆	Iq (No load) (uA) 0dW嘉泰姆
CXSD621220dW嘉泰姆	TQFN5x6-280dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	50dW嘉泰姆	4.50dW嘉泰姆	260dW嘉泰姆	3800dW嘉泰姆	0.80dW嘉泰姆	500dW嘉泰姆	200dW嘉泰姆	10000dW嘉泰姆
CXSD621230dW嘉泰姆	SOP-80dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	20dW嘉泰姆	4.50dW嘉泰姆	260dW嘉泰姆	3800dW嘉泰姆	0.80dW嘉泰姆	1000dW嘉泰姆		10000dW嘉泰姆
CXSD621240dW嘉泰姆	SOP-8P0dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	40dW嘉泰姆	4.50dW嘉泰姆	260dW嘉泰姆	3800dW嘉泰姆	0.80dW嘉泰姆	800dW嘉泰姆		10000dW嘉泰姆
CXSD621250dW嘉泰姆	SOT23-5\|TSOT23-50dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆	250dW嘉泰姆
CXSD62125A0dW嘉泰姆	SOT23-50dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆
CXSD621260dW嘉泰姆	SOP-80dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	30dW嘉泰姆	4.30dW嘉泰姆	140dW嘉泰姆	5000dW嘉泰姆	0.80dW嘉泰姆	700dW嘉泰姆	700dW嘉泰姆	5000dW嘉泰姆
CXSD621270dW嘉泰姆	SOP-8P0dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	30dW嘉泰姆	4.30dW嘉泰姆	140dW嘉泰姆	5000dW嘉泰姆	0.80dW嘉泰姆	550dW嘉泰姆	450dW嘉泰姆	5000dW嘉泰姆
CXSD62128B0dW嘉泰姆	TDFN3x3-100dW嘉泰姆			30dW嘉泰姆	2.60dW嘉泰姆	5.50dW嘉泰姆	20000dW嘉泰姆	0.80dW嘉泰姆	1100dW嘉泰姆	1100dW嘉泰姆	4600dW嘉泰姆
CXSD621290dW嘉泰姆	TDFN3x3-100dW嘉泰姆	CM0dW嘉泰姆	20dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆	5000dW嘉泰姆
CXSD62129A0dW嘉泰姆	TDFN3x3-100dW嘉泰姆	CM0dW嘉泰姆	20dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆
CXSD621300dW嘉泰姆	TDFN2x2-60dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆	250dW嘉泰姆
CXSD62130A0dW嘉泰姆	TDFN2x2-60dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆
CXSD621310dW嘉泰姆	TDFN3x3-120dW嘉泰姆	CM0dW嘉泰姆	20dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆	250dW嘉泰姆
CXSD62131A0dW嘉泰姆	TDFN3x3-120dW嘉泰姆	CM0dW嘉泰姆	20dW嘉泰姆	10dW嘉泰姆	2.70dW嘉泰姆	60dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆
CXSD62131C0dW嘉泰姆	TDFN 3x3 120dW嘉泰姆	CM0dW嘉泰姆	20dW嘉泰姆	10dW嘉泰姆	30dW嘉泰姆	5.50dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆	300dW嘉泰姆
CXSD621320dW嘉泰姆	TQFN3x3-200dW嘉泰姆	CM0dW嘉泰姆	30dW嘉泰姆	20dW嘉泰姆	2.90dW嘉泰姆	5.50dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	-0dW嘉泰姆	-0dW嘉泰姆	3000dW嘉泰姆
CXSD621330dW嘉泰姆	TDFN2x2-80dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	10dW嘉泰姆	3.30dW嘉泰姆	80dW嘉泰姆	15000dW嘉泰姆	0.60dW嘉泰姆	2800dW嘉泰姆	2500dW嘉泰姆	250dW嘉泰姆
CXSD621340dW嘉泰姆	SOP-80dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	20dW嘉泰姆	4.50dW嘉泰姆	240dW嘉泰姆	3400dW嘉泰姆	0.9250dW嘉泰姆	1100dW嘉泰姆	1100dW嘉泰姆	19000dW嘉泰姆
CXSD621350dW嘉泰姆	SOP-8P0dW嘉泰姆	CM0dW嘉泰姆	10dW嘉泰姆	30dW嘉泰姆	4.50dW嘉泰姆	240dW嘉泰姆	3400dW嘉泰姆	0.9250dW嘉泰姆	1100dW嘉泰姆	1100dW嘉泰姆	19000dW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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