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

发表时间：2020-04-24浏览次数：9

目录ElO嘉泰姆

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

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

VIN to provide excellent output voltage regulation.ElO嘉泰姆
The CXSD62123 regulates the output voltage in automatic PSM/PWM modeElO嘉泰姆
operation, depending on the output current, for high efficiency operation over lightElO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) ElO嘉泰姆

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

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

system solution with minimal exter-nal components.ElO嘉泰姆
二.产品特点(Features)ElO嘉泰姆
Wide Input Voltage from 4.5V to 26VElO嘉泰姆
Output Current up to 2AElO嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINElO嘉泰姆
- 0.8V Reference VoltageElO嘉泰姆
- ±2.5% System AccuracyElO嘉泰姆
100mΩ Integrated P-Channel Power MOSFETElO嘉泰姆
High Efficiency up to 91%ElO嘉泰姆
- Pulse-Skipping Mode (PSM) / PWM Mode Op-erationElO嘉泰姆
Current-Mode OperationElO嘉泰姆
- Stable with Ceramic Output CapacitorsElO嘉泰姆
- Fast Transient ResponseElO嘉泰姆
Power-On-Reset MonitoringElO嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModeElO嘉泰姆
Built-in Digital Soft-StartElO嘉泰姆
Output Current-Limit Protection with Frequency FoldbackElO嘉泰姆
70% Under-Voltage ProtectionElO嘉泰姆
Over-Temperature ProtectionElO嘉泰姆
<5μA Quiescent Current During Shutdown SOP-8 PackageElO嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)ElO嘉泰姆
三,应用范围 (Applications)ElO嘉泰姆
LCD Monitor / TVElO嘉泰姆
Set-Top BoxElO嘉泰姆
Portable DVDElO嘉泰姆
Wireless LANElO嘉泰姆
ADSL, Switch HUBElO嘉泰姆
Notebook ComputerElO嘉泰姆
Step-Down Converters Requiring High Efficiency and 2A Output CurrentElO嘉泰姆

四.下载产品资料PDF文档 ElO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！ElO嘉泰姆

QQ截图20160419174301.jpg ElO嘉泰姆

五,产品封装图 (Package)ElO嘉泰姆

ElO嘉泰姆
六.电路原理图ElO嘉泰姆
ElO嘉泰姆
ElO嘉泰姆

七,功能概述ElO嘉泰姆

Inductor Value CalculationElO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 efficiencyElO嘉泰姆
due to an increase in MOSFET gate charge losses. The equation (2) shows that the inductance value has a directElO嘉泰姆
effect on ripple current.Accepting larger values of ripple current allows the use of low inductances but results inElO嘉泰姆
higher output voltage ripple and greater core losses. A reasonable starting point for setting ripple current isElO嘉泰姆
∆I ≤ 0.4. IOUT(MAX). Remember, the maximum ripple current occurs at the maximum input voltage. ElO嘉泰姆
Output Diode SelectionElO嘉泰姆
The Schottky diode carries load current during the offtime. Therefore, the average diode current is dependentElO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-ElO嘉泰姆
erage power dissipation so as not to exceed the diode ratings.ElO嘉泰姆
In high power switching regulator, a correct layout is important to ensure proper operation of the regulator. InElO嘉泰姆
general, interconnecting impedance should be minimized by using short and wide printed circuit traces. Signal andElO嘉泰姆
power grounds are to be kept separating and finally c om bined using ground plane construction orElO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.ElO嘉泰姆
Below is a checklist for your layout:ElO嘉泰姆
pedances should be minimized by using wide and short printed circuit traces.ElO嘉泰姆
3. Keep the sensitive small signal nodes (FB, COMP)away from switching nodes (LX or others) on the PCB.ElO嘉泰姆
Therefore, place the feedback divider and the feedback compensation network close to the IC to avoid switch-ElO嘉泰姆
ing noise. Connect the ground of feedback divider directly to the GND pin of the IC using a dedicatedElO嘉泰姆
ground trace.ElO嘉泰姆
4. The VCC decoupling capacitor should be right next to the VCC and GND pins. Capacitor C2 should beElO嘉泰姆
connected as close to the VIN and UGND pins as possible.ElO嘉泰姆
5. Place the decoupling ceramic capacitor C1 near the VIN as close as possible. The bulk capacitors C8 areElO嘉泰姆
also placed near VIN. Use a wide power ground plane to connect the C1, C8, C4, and Schottky diode to pro-ElO嘉泰姆
vide a low impedance path between the components for large and high slew rate current.ElO嘉泰姆
八,相关产品 更多同类产品.......ElO嘉泰姆

Switching Regulator > Buck ConverterElO嘉泰姆
Part_No ElO嘉泰姆	PackageElO嘉泰姆	ArchitectuElO嘉泰姆	No.ofElO嘉泰姆 PWM ElO嘉泰姆 OutpuElO嘉泰姆	DriveElO嘉泰姆 LoutElO嘉泰姆 (A) ElO嘉泰姆	Vin(V) ElO嘉泰姆		FmaxElO嘉泰姆 Khz ElO嘉泰姆	Vref ElO嘉泰姆 (V) ElO嘉泰姆	R-Top (milohm) ElO嘉泰姆	R-Sync (milohm) ElO嘉泰姆	Iq (No load) (uA) ElO嘉泰姆
Part_No ElO嘉泰姆	PackageElO嘉泰姆	ArchitectuElO嘉泰姆	No.ofElO嘉泰姆 PWM ElO嘉泰姆 OutpuElO嘉泰姆	DriveElO嘉泰姆 LoutElO嘉泰姆 (A) ElO嘉泰姆	minElO嘉泰姆	maxElO嘉泰姆	FmaxElO嘉泰姆 Khz ElO嘉泰姆	Vref ElO嘉泰姆 (V) ElO嘉泰姆	R-Top (milohm) ElO嘉泰姆	R-Sync (milohm) ElO嘉泰姆	Iq (No load) (uA) ElO嘉泰姆
CXSD62122ElO嘉泰姆	TQFN5x6-28ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	5ElO嘉泰姆	4.5ElO嘉泰姆	26ElO嘉泰姆	380ElO嘉泰姆	0.8ElO嘉泰姆	50ElO嘉泰姆	20ElO嘉泰姆	1000ElO嘉泰姆
CXSD62123ElO嘉泰姆	SOP-8ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	2ElO嘉泰姆	4.5ElO嘉泰姆	26ElO嘉泰姆	380ElO嘉泰姆	0.8ElO嘉泰姆	100ElO嘉泰姆		1000ElO嘉泰姆
CXSD62124ElO嘉泰姆	SOP-8PElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	4ElO嘉泰姆	4.5ElO嘉泰姆	26ElO嘉泰姆	380ElO嘉泰姆	0.8ElO嘉泰姆	80ElO嘉泰姆		1000ElO嘉泰姆
CXSD62125ElO嘉泰姆	SOT23-5\|TSOT23-5ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆	25ElO嘉泰姆
CXSD62125AElO嘉泰姆	SOT23-5ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆
CXSD62126ElO嘉泰姆	SOP-8ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	3ElO嘉泰姆	4.3ElO嘉泰姆	14ElO嘉泰姆	500ElO嘉泰姆	0.8ElO嘉泰姆	70ElO嘉泰姆	70ElO嘉泰姆	500ElO嘉泰姆
CXSD62127ElO嘉泰姆	SOP-8PElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	3ElO嘉泰姆	4.3ElO嘉泰姆	14ElO嘉泰姆	500ElO嘉泰姆	0.8ElO嘉泰姆	55ElO嘉泰姆	45ElO嘉泰姆	500ElO嘉泰姆
CXSD62128BElO嘉泰姆	TDFN3x3-10ElO嘉泰姆			3ElO嘉泰姆	2.6ElO嘉泰姆	5.5ElO嘉泰姆	2000ElO嘉泰姆	0.8ElO嘉泰姆	110ElO嘉泰姆	110ElO嘉泰姆	460ElO嘉泰姆
CXSD62129ElO嘉泰姆	TDFN3x3-10ElO嘉泰姆	CMElO嘉泰姆	2ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆	500ElO嘉泰姆
CXSD62129AElO嘉泰姆	TDFN3x3-10ElO嘉泰姆	CMElO嘉泰姆	2ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆
CXSD62130ElO嘉泰姆	TDFN2x2-6ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆	25ElO嘉泰姆
CXSD62130AElO嘉泰姆	TDFN2x2-6ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆
CXSD62131ElO嘉泰姆	TDFN3x3-12ElO嘉泰姆	CMElO嘉泰姆	2ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆	25ElO嘉泰姆
CXSD62131AElO嘉泰姆	TDFN3x3-12ElO嘉泰姆	CMElO嘉泰姆	2ElO嘉泰姆	1ElO嘉泰姆	2.7ElO嘉泰姆	6ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆
CXSD62131CElO嘉泰姆	TDFN 3x3 12ElO嘉泰姆	CMElO嘉泰姆	2ElO嘉泰姆	1ElO嘉泰姆	3ElO嘉泰姆	5.5ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆	30ElO嘉泰姆
CXSD62132ElO嘉泰姆	TQFN3x3-20ElO嘉泰姆	CMElO嘉泰姆	3ElO嘉泰姆	2ElO嘉泰姆	2.9ElO嘉泰姆	5.5ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	-ElO嘉泰姆	-ElO嘉泰姆	300ElO嘉泰姆
CXSD62133ElO嘉泰姆	TDFN2x2-8ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	1ElO嘉泰姆	3.3ElO嘉泰姆	8ElO嘉泰姆	1500ElO嘉泰姆	0.6ElO嘉泰姆	280ElO嘉泰姆	250ElO嘉泰姆	25ElO嘉泰姆
CXSD62134ElO嘉泰姆	SOP-8ElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	2ElO嘉泰姆	4.5ElO嘉泰姆	24ElO嘉泰姆	340ElO嘉泰姆	0.925ElO嘉泰姆	110ElO嘉泰姆	110ElO嘉泰姆	1900ElO嘉泰姆
CXSD62135ElO嘉泰姆	SOP-8PElO嘉泰姆	CMElO嘉泰姆	1ElO嘉泰姆	3ElO嘉泰姆	4.5ElO嘉泰姆	24ElO嘉泰姆	340ElO嘉泰姆	0.925ElO嘉泰姆	110ElO嘉泰姆	110ElO嘉泰姆	1900ElO嘉泰姆

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