2A异步降压型转换器CXSD62123电流模式控制4.5～26V的输入电压PSM/PWM模式下调节输出电压

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发表时间：2020-04-24浏览次数：104

2A异步降压型转换器CXSD62123电流模式控制4.5～26V的输入电压PSM/PWM模式下调节输出电压

目录Iz0嘉泰姆

1.产品概述         2.产品特点Iz0嘉泰姆
3.应用范围       4.下载产品资料PDF文档 Iz0嘉泰姆
5.产品封装图                     6.电路原理图             Iz0嘉泰姆
7.功能概述       8.相关产品Iz0嘉泰姆

一,产品概述(General Description) Iz0嘉泰姆
The CXSD62123 is a 2A, asynchronous, step-down con-verter with integratedIz0嘉泰姆
100mΩ P-channel MOSFET. The device, with current-mode control scheme, canIz0嘉泰姆
convert 4.5~26V input voltage to the output voltage adjustable from 0.8 to 90%Iz0嘉泰姆

VIN to provide excellent output voltage regulation.Iz0嘉泰姆
The CXSD62123 regulates the output voltage in automatic PSM/PWM modeIz0嘉泰姆
operation, depending on the output current, for high efficiency operation over lightIz0嘉泰姆
to full load current. The CXSD62123 is also equipped with power-on-reset, soft-start, and whole protections (under-voltage,over- temperature, and current-limit) Iz0嘉泰姆

into a single package.In shutdown mode, the supply current drops below 5μA.Iz0嘉泰姆

This device, available in a 8-pin SOP-8 package, pro-vides a very compact Iz0嘉泰姆

system solution with minimal exter-nal components.Iz0嘉泰姆
二.产品特点(Features)Iz0嘉泰姆
Wide Input Voltage from 4.5V to 26VIz0嘉泰姆
Output Current up to 2AIz0嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINIz0嘉泰姆
- 0.8V Reference VoltageIz0嘉泰姆
- ±2.5% System AccuracyIz0嘉泰姆
100mΩ Integrated P-Channel Power MOSFETIz0嘉泰姆
High Efficiency up to 91%Iz0嘉泰姆
- Pulse-Skipping Mode (PSM) / PWM Mode Op-erationIz0嘉泰姆
Current-Mode OperationIz0嘉泰姆
- Stable with Ceramic Output CapacitorsIz0嘉泰姆
- Fast Transient ResponseIz0嘉泰姆
Power-On-Reset MonitoringIz0嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModeIz0嘉泰姆
Built-in Digital Soft-StartIz0嘉泰姆
Output Current-Limit Protection with Frequency FoldbackIz0嘉泰姆
70% Under-Voltage ProtectionIz0嘉泰姆
Over-Temperature ProtectionIz0嘉泰姆
<5μA Quiescent Current During Shutdown SOP-8 PackageIz0嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)Iz0嘉泰姆
三,应用范围 (Applications)Iz0嘉泰姆
LCD Monitor / TVIz0嘉泰姆
Set-Top BoxIz0嘉泰姆
Portable DVDIz0嘉泰姆
Wireless LANIz0嘉泰姆
ADSL, Switch HUBIz0嘉泰姆
Notebook ComputerIz0嘉泰姆
Step-Down Converters Requiring High Efficiency and 2A Output CurrentIz0嘉泰姆

四.下载产品资料PDF文档 Iz0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！Iz0嘉泰姆

QQ截图20160419174301.jpg Iz0嘉泰姆

五,产品封装图 (Package)Iz0嘉泰姆

Iz0嘉泰姆
六.电路原理图Iz0嘉泰姆
Iz0嘉泰姆
Iz0嘉泰姆

七,功能概述Iz0嘉泰姆

Inductor Value CalculationIz0嘉泰姆
The operating frequency and inductor selection are interrelated in that higher operating frequencies permit the use of a smaller inductor for the same amount of inductorripple current. However, this is at the expense of efficiencyIz0嘉泰姆
due to an increase in MOSFET gate charge losses. The equation (2) shows that the inductance value has a directIz0嘉泰姆
effect on ripple current.Accepting larger values of ripple current allows the use of low inductances but results inIz0嘉泰姆
higher output voltage ripple and greater core losses. A reasonable starting point for setting ripple current isIz0嘉泰姆
∆I ≤ 0.4. IOUT(MAX). Remember, the maximum ripple current occurs at the maximum input voltage. Iz0嘉泰姆
Output Diode SelectionIz0嘉泰姆
The Schottky diode carries load current during the offtime. Therefore, the average diode current is dependentIz0嘉泰姆
on the P-channel power MOSFET duty cycle. At high input voltages, the diode conducts most of the time. As VIN ap-proaches VOUT, the diode conducts only a small fraction of the time. The most stressful condition for the diode is when the output is short-circuited. Therefore, it is important to adequately specify the diode peak current and av-Iz0嘉泰姆
erage power dissipation so as not to exceed the diode ratings.Iz0嘉泰姆
In high power switching regulator, a correct layout is important to ensure proper operation of the regulator. InIz0嘉泰姆
general, interconnecting impedance should be minimized by using short and wide printed circuit traces. Signal andIz0嘉泰姆
power grounds are to be kept separating and finally c om bined using ground plane construction orIz0嘉泰姆
single point grounding. Figure 2 illustrates the layout,with bold lines indicating high current paths. Components along the bold lines should be placed close together.Iz0嘉泰姆
Below is a checklist for your layout:Iz0嘉泰姆
pedances should be minimized by using wide and short printed circuit traces.Iz0嘉泰姆
3. Keep the sensitive small signal nodes (FB, COMP)away from switching nodes (LX or others) on the PCB.Iz0嘉泰姆
Therefore, place the feedback divider and the feedback compensation network close to the IC to avoid switch-Iz0嘉泰姆
ing noise. Connect the ground of feedback divider directly to the GND pin of the IC using a dedicatedIz0嘉泰姆
ground trace.Iz0嘉泰姆
4. The VCC decoupling capacitor should be right next to the VCC and GND pins. Capacitor C2 should beIz0嘉泰姆
connected as close to the VIN and UGND pins as possible.Iz0嘉泰姆
5. Place the decoupling ceramic capacitor C1 near the VIN as close as possible. The bulk capacitors C8 areIz0嘉泰姆
also placed near VIN. Use a wide power ground plane to connect the C1, C8, C4, and Schottky diode to pro-Iz0嘉泰姆
vide a low impedance path between the components for large and high slew rate current.Iz0嘉泰姆
八,相关产品 更多同类产品.......Iz0嘉泰姆

Switching Regulator > Buck ConverterIz0嘉泰姆
Part_No Iz0嘉泰姆	PackageIz0嘉泰姆	ArchitectuIz0嘉泰姆	No.ofIz0嘉泰姆 PWM Iz0嘉泰姆 OutpuIz0嘉泰姆	DriveIz0嘉泰姆 LoutIz0嘉泰姆 (A) Iz0嘉泰姆	Vin(V) Iz0嘉泰姆		FmaxIz0嘉泰姆 Khz Iz0嘉泰姆	Vref Iz0嘉泰姆 (V) Iz0嘉泰姆	R-Top (milohm) Iz0嘉泰姆	R-Sync (milohm) Iz0嘉泰姆	Iq (No load) (uA) Iz0嘉泰姆
Part_No Iz0嘉泰姆	PackageIz0嘉泰姆	ArchitectuIz0嘉泰姆	No.ofIz0嘉泰姆 PWM Iz0嘉泰姆 OutpuIz0嘉泰姆	DriveIz0嘉泰姆 LoutIz0嘉泰姆 (A) Iz0嘉泰姆	minIz0嘉泰姆	maxIz0嘉泰姆	FmaxIz0嘉泰姆 Khz Iz0嘉泰姆	Vref Iz0嘉泰姆 (V) Iz0嘉泰姆	R-Top (milohm) Iz0嘉泰姆	R-Sync (milohm) Iz0嘉泰姆	Iq (No load) (uA) Iz0嘉泰姆
CXSD62122Iz0嘉泰姆	TQFN5x6-28Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	5Iz0嘉泰姆	4.5Iz0嘉泰姆	26Iz0嘉泰姆	380Iz0嘉泰姆	0.8Iz0嘉泰姆	50Iz0嘉泰姆	20Iz0嘉泰姆	1000Iz0嘉泰姆
CXSD62123Iz0嘉泰姆	SOP-8Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	2Iz0嘉泰姆	4.5Iz0嘉泰姆	26Iz0嘉泰姆	380Iz0嘉泰姆	0.8Iz0嘉泰姆	100Iz0嘉泰姆		1000Iz0嘉泰姆
CXSD62124Iz0嘉泰姆	SOP-8PIz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	4Iz0嘉泰姆	4.5Iz0嘉泰姆	26Iz0嘉泰姆	380Iz0嘉泰姆	0.8Iz0嘉泰姆	80Iz0嘉泰姆		1000Iz0嘉泰姆
CXSD62125Iz0嘉泰姆	SOT23-5\|TSOT23-5Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆	25Iz0嘉泰姆
CXSD62125AIz0嘉泰姆	SOT23-5Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆
CXSD62126Iz0嘉泰姆	SOP-8Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	3Iz0嘉泰姆	4.3Iz0嘉泰姆	14Iz0嘉泰姆	500Iz0嘉泰姆	0.8Iz0嘉泰姆	70Iz0嘉泰姆	70Iz0嘉泰姆	500Iz0嘉泰姆
CXSD62127Iz0嘉泰姆	SOP-8PIz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	3Iz0嘉泰姆	4.3Iz0嘉泰姆	14Iz0嘉泰姆	500Iz0嘉泰姆	0.8Iz0嘉泰姆	55Iz0嘉泰姆	45Iz0嘉泰姆	500Iz0嘉泰姆
CXSD62128BIz0嘉泰姆	TDFN3x3-10Iz0嘉泰姆			3Iz0嘉泰姆	2.6Iz0嘉泰姆	5.5Iz0嘉泰姆	2000Iz0嘉泰姆	0.8Iz0嘉泰姆	110Iz0嘉泰姆	110Iz0嘉泰姆	460Iz0嘉泰姆
CXSD62129Iz0嘉泰姆	TDFN3x3-10Iz0嘉泰姆	CMIz0嘉泰姆	2Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆	500Iz0嘉泰姆
CXSD62129AIz0嘉泰姆	TDFN3x3-10Iz0嘉泰姆	CMIz0嘉泰姆	2Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆
CXSD62130Iz0嘉泰姆	TDFN2x2-6Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆	25Iz0嘉泰姆
CXSD62130AIz0嘉泰姆	TDFN2x2-6Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆
CXSD62131Iz0嘉泰姆	TDFN3x3-12Iz0嘉泰姆	CMIz0嘉泰姆	2Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆	25Iz0嘉泰姆
CXSD62131AIz0嘉泰姆	TDFN3x3-12Iz0嘉泰姆	CMIz0嘉泰姆	2Iz0嘉泰姆	1Iz0嘉泰姆	2.7Iz0嘉泰姆	6Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆
CXSD62131CIz0嘉泰姆	TDFN 3x3 12Iz0嘉泰姆	CMIz0嘉泰姆	2Iz0嘉泰姆	1Iz0嘉泰姆	3Iz0嘉泰姆	5.5Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆	30Iz0嘉泰姆
CXSD62132Iz0嘉泰姆	TQFN3x3-20Iz0嘉泰姆	CMIz0嘉泰姆	3Iz0嘉泰姆	2Iz0嘉泰姆	2.9Iz0嘉泰姆	5.5Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	-Iz0嘉泰姆	-Iz0嘉泰姆	300Iz0嘉泰姆
CXSD62133Iz0嘉泰姆	TDFN2x2-8Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	1Iz0嘉泰姆	3.3Iz0嘉泰姆	8Iz0嘉泰姆	1500Iz0嘉泰姆	0.6Iz0嘉泰姆	280Iz0嘉泰姆	250Iz0嘉泰姆	25Iz0嘉泰姆
CXSD62134Iz0嘉泰姆	SOP-8Iz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	2Iz0嘉泰姆	4.5Iz0嘉泰姆	24Iz0嘉泰姆	340Iz0嘉泰姆	0.925Iz0嘉泰姆	110Iz0嘉泰姆	110Iz0嘉泰姆	1900Iz0嘉泰姆
CXSD62135Iz0嘉泰姆	SOP-8PIz0嘉泰姆	CMIz0嘉泰姆	1Iz0嘉泰姆	3Iz0嘉泰姆	4.5Iz0嘉泰姆	24Iz0嘉泰姆	340Iz0嘉泰姆	0.925Iz0嘉泰姆	110Iz0嘉泰姆	110Iz0嘉泰姆	1900Iz0嘉泰姆

上一篇：5A同步降压转换器CXSD62122 50mΩ P沟道功率MOSFET和20mΩ N沟道功率MOSFET电流模式控制方案

下一篇：4A26V380kHz异步降压转换器CXSD62124 80mW P沟道MOSFET 输出电流调节自动PSM/PWM模式操作中的输出电压

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