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

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发表时间：2020-04-28浏览次数：60

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

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

一,产品概述(General Description) lhz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.lhz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.lhz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.lhz嘉泰姆
This device, available SOP-8P, provides a very compact system solution external components and PCB area.lhz嘉泰姆
二.产品特点(Features)lhz嘉泰姆
Wide Input Voltage from 4.5V to 24Vlhz嘉泰姆
3A Continuous Output Currentlhz嘉泰姆
Adjustable Output Voltage from 0.925V to 20Vlhz嘉泰姆
Intergrated High/Low Side MOSFETlhz嘉泰姆
PFM/PWM mode Operationlhz嘉泰姆
Fixed 340kHz Switching Frequencylhz嘉泰姆
Stable with Low ESR Ceramic Output Capacitorslhz嘉泰姆
Power-On-Reset Detectionlhz嘉泰姆
Programmable Soft-Startlhz嘉泰姆
Over-Temperature Protectionlhz嘉泰姆
Current-Limit Protection with Frequency Foldbacklhz嘉泰姆
Enable/Shutdown Functionlhz嘉泰姆
Small SOP-8P Packagelhz嘉泰姆
Lead Free and Green Devices Availablelhz嘉泰姆
(RoHS Compliantlhz嘉泰姆
三,应用范围 (Applications)lhz嘉泰姆

LCD Monitor/TVlhz嘉泰姆

Set-Top Boxlhz嘉泰姆
DSL, Switch HUBlhz嘉泰姆
Notebook Computerlhz嘉泰姆

四.下载产品资料PDF文档 lhz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！lhz嘉泰姆

QQ截图20160419174301.jpg lhz嘉泰姆

lhz嘉泰姆

五,产品封装图 (Package)lhz嘉泰姆

lhz嘉泰姆

六.电路原理图lhz嘉泰姆

lhz嘉泰姆

七,功能概述lhz嘉泰姆

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

Switching Regulator > Buck Converterlhz嘉泰姆
Part_No lhz嘉泰姆	Packagelhz嘉泰姆	Architectulhz嘉泰姆	No.oflhz嘉泰姆 PWM lhz嘉泰姆 Outpulhz嘉泰姆	Drivelhz嘉泰姆 Loutlhz嘉泰姆 (A) lhz嘉泰姆	Vin(V) lhz嘉泰姆		Fmaxlhz嘉泰姆 Khz lhz嘉泰姆	Vref lhz嘉泰姆 (V) lhz嘉泰姆	R-Top (milohm) lhz嘉泰姆	R-Sync (milohm) lhz嘉泰姆	Iq (No load) (uA) lhz嘉泰姆
Part_No lhz嘉泰姆	Packagelhz嘉泰姆	Architectulhz嘉泰姆	No.oflhz嘉泰姆 PWM lhz嘉泰姆 Outpulhz嘉泰姆	Drivelhz嘉泰姆 Loutlhz嘉泰姆 (A) lhz嘉泰姆	minlhz嘉泰姆	maxlhz嘉泰姆	Fmaxlhz嘉泰姆 Khz lhz嘉泰姆	Vref lhz嘉泰姆 (V) lhz嘉泰姆	R-Top (milohm) lhz嘉泰姆	R-Sync (milohm) lhz嘉泰姆	Iq (No load) (uA) lhz嘉泰姆
CXSD62122lhz嘉泰姆	TQFN5x6-28lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	5lhz嘉泰姆	4.5lhz嘉泰姆	26lhz嘉泰姆	380lhz嘉泰姆	0.8lhz嘉泰姆	50lhz嘉泰姆	20lhz嘉泰姆	1000lhz嘉泰姆
CXSD62123lhz嘉泰姆	SOP-8lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	2lhz嘉泰姆	4.5lhz嘉泰姆	26lhz嘉泰姆	380lhz嘉泰姆	0.8lhz嘉泰姆	100lhz嘉泰姆		1000lhz嘉泰姆
CXSD62124lhz嘉泰姆	SOP-8Plhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	4lhz嘉泰姆	4.5lhz嘉泰姆	26lhz嘉泰姆	380lhz嘉泰姆	0.8lhz嘉泰姆	80lhz嘉泰姆		1000lhz嘉泰姆
CXSD62125lhz嘉泰姆	SOT23-5\|TSOT23-5lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆	25lhz嘉泰姆
CXSD62125Alhz嘉泰姆	SOT23-5lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆
CXSD62126lhz嘉泰姆	SOP-8lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	3lhz嘉泰姆	4.3lhz嘉泰姆	14lhz嘉泰姆	500lhz嘉泰姆	0.8lhz嘉泰姆	70lhz嘉泰姆	70lhz嘉泰姆	500lhz嘉泰姆
CXSD62127lhz嘉泰姆	SOP-8Plhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	3lhz嘉泰姆	4.3lhz嘉泰姆	14lhz嘉泰姆	500lhz嘉泰姆	0.8lhz嘉泰姆	55lhz嘉泰姆	45lhz嘉泰姆	500lhz嘉泰姆
CXSD62128Blhz嘉泰姆	TDFN3x3-10lhz嘉泰姆			3lhz嘉泰姆	2.6lhz嘉泰姆	5.5lhz嘉泰姆	2000lhz嘉泰姆	0.8lhz嘉泰姆	110lhz嘉泰姆	110lhz嘉泰姆	460lhz嘉泰姆
CXSD62129lhz嘉泰姆	TDFN3x3-10lhz嘉泰姆	CMlhz嘉泰姆	2lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆	500lhz嘉泰姆
CXSD62129Alhz嘉泰姆	TDFN3x3-10lhz嘉泰姆	CMlhz嘉泰姆	2lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆
CXSD62130lhz嘉泰姆	TDFN2x2-6lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆	25lhz嘉泰姆
CXSD62130Alhz嘉泰姆	TDFN2x2-6lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆
CXSD62131lhz嘉泰姆	TDFN3x3-12lhz嘉泰姆	CMlhz嘉泰姆	2lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆	25lhz嘉泰姆
CXSD62131Alhz嘉泰姆	TDFN3x3-12lhz嘉泰姆	CMlhz嘉泰姆	2lhz嘉泰姆	1lhz嘉泰姆	2.7lhz嘉泰姆	6lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆
CXSD62131Clhz嘉泰姆	TDFN 3x3 12lhz嘉泰姆	CMlhz嘉泰姆	2lhz嘉泰姆	1lhz嘉泰姆	3lhz嘉泰姆	5.5lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆	30lhz嘉泰姆
CXSD62132lhz嘉泰姆	TQFN3x3-20lhz嘉泰姆	CMlhz嘉泰姆	3lhz嘉泰姆	2lhz嘉泰姆	2.9lhz嘉泰姆	5.5lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	-lhz嘉泰姆	-lhz嘉泰姆	300lhz嘉泰姆
CXSD62133lhz嘉泰姆	TDFN2x2-8lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	1lhz嘉泰姆	3.3lhz嘉泰姆	8lhz嘉泰姆	1500lhz嘉泰姆	0.6lhz嘉泰姆	280lhz嘉泰姆	250lhz嘉泰姆	25lhz嘉泰姆
CXSD62134lhz嘉泰姆	SOP-8lhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	2lhz嘉泰姆	4.5lhz嘉泰姆	24lhz嘉泰姆	340lhz嘉泰姆	0.925lhz嘉泰姆	110lhz嘉泰姆	110lhz嘉泰姆	1900lhz嘉泰姆
CXSD62135lhz嘉泰姆	SOP-8Plhz嘉泰姆	CMlhz嘉泰姆	1lhz嘉泰姆	3lhz嘉泰姆	4.5lhz嘉泰姆	24lhz嘉泰姆	340lhz嘉泰姆	0.925lhz嘉泰姆	110lhz嘉泰姆	110lhz嘉泰姆	1900lhz嘉泰姆

上一篇：110m功率mosfet 3A同步降压转换器CXSD62144电流模式控制4.5V至24V的宽输入电压转换为0.925V至20V的可调输出电压

下一篇：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

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