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：162

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w6T嘉泰姆

1.产品概述         2.产品特点w6T嘉泰姆
3.应用范围       4.下载产品资料PDF文档 w6T嘉泰姆
5.产品封装图                     6.电路原理图             w6T嘉泰姆
7.功能概述       8.相关产品w6T嘉泰姆

一,产品概述(General Description) w6T嘉泰姆
The CXSD62123 is a 2A, asynchronous, step-down con-verter with integratedw6T嘉泰姆
100mΩ P-channel MOSFET. The device, with current-mode control scheme, canw6T嘉泰姆
convert 4.5~26V input voltage to the output voltage adjustable from 0.8 to 90%w6T嘉泰姆

VIN to provide excellent output voltage regulation.w6T嘉泰姆
The CXSD62123 regulates the output voltage in automatic PSM/PWM modew6T嘉泰姆
operation, depending on the output current, for high efficiency operation over lightw6T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) w6T嘉泰姆

into a single package.In shutdown mode, the supply current drops below 5μA.w6T嘉泰姆

This device, available in a 8-pin SOP-8 package, pro-vides a very compact w6T嘉泰姆

system solution with minimal exter-nal components.w6T嘉泰姆
二.产品特点(Features)w6T嘉泰姆
Wide Input Voltage from 4.5V to 26Vw6T嘉泰姆
Output Current up to 2Aw6T嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINw6T嘉泰姆
- 0.8V Reference Voltagew6T嘉泰姆
- ±2.5% System Accuracyw6T嘉泰姆
100mΩ Integrated P-Channel Power MOSFETw6T嘉泰姆
High Efficiency up to 91%w6T嘉泰姆
- Pulse-Skipping Mode (PSM) / PWM Mode Op-erationw6T嘉泰姆
Current-Mode Operationw6T嘉泰姆
- Stable with Ceramic Output Capacitorsw6T嘉泰姆
- Fast Transient Responsew6T嘉泰姆
Power-On-Reset Monitoringw6T嘉泰姆
Fixed 380kHz Switching Frequency in PWM Modew6T嘉泰姆
Built-in Digital Soft-Startw6T嘉泰姆
Output Current-Limit Protection with Frequency Foldbackw6T嘉泰姆
70% Under-Voltage Protectionw6T嘉泰姆
Over-Temperature Protectionw6T嘉泰姆
<5μA Quiescent Current During Shutdown SOP-8 Packagew6T嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)w6T嘉泰姆
三,应用范围 (Applications)w6T嘉泰姆
LCD Monitor / TVw6T嘉泰姆
Set-Top Boxw6T嘉泰姆
Portable DVDw6T嘉泰姆
Wireless LANw6T嘉泰姆
ADSL, Switch HUBw6T嘉泰姆
Notebook Computerw6T嘉泰姆
Step-Down Converters Requiring High Efficiency and 2A Output Currentw6T嘉泰姆

四.下载产品资料PDF文档 w6T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！w6T嘉泰姆

QQ截图20160419174301.jpg w6T嘉泰姆

五,产品封装图 (Package)w6T嘉泰姆

w6T嘉泰姆
六.电路原理图w6T嘉泰姆
w6T嘉泰姆
w6T嘉泰姆

七,功能概述w6T嘉泰姆

Inductor Value Calculationw6T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 efficiencyw6T嘉泰姆
due to an increase in MOSFET gate charge losses. The equation (2) shows that the inductance value has a directw6T嘉泰姆
effect on ripple current.Accepting larger values of ripple current allows the use of low inductances but results inw6T嘉泰姆
higher output voltage ripple and greater core losses. A reasonable starting point for setting ripple current isw6T嘉泰姆
∆I ≤ 0.4. IOUT(MAX). Remember, the maximum ripple current occurs at the maximum input voltage. w6T嘉泰姆
Output Diode Selectionw6T嘉泰姆
The Schottky diode carries load current during the offtime. Therefore, the average diode current is dependentw6T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-w6T嘉泰姆
erage power dissipation so as not to exceed the diode ratings.w6T嘉泰姆
In high power switching regulator, a correct layout is important to ensure proper operation of the regulator. Inw6T嘉泰姆
general, interconnecting impedance should be minimized by using short and wide printed circuit traces. Signal andw6T嘉泰姆
power grounds are to be kept separating and finally c om bined using ground plane construction orw6T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.w6T嘉泰姆
Below is a checklist for your layout:w6T嘉泰姆
pedances should be minimized by using wide and short printed circuit traces.w6T嘉泰姆
3. Keep the sensitive small signal nodes (FB, COMP)away from switching nodes (LX or others) on the PCB.w6T嘉泰姆
Therefore, place the feedback divider and the feedback compensation network close to the IC to avoid switch-w6T嘉泰姆
ing noise. Connect the ground of feedback divider directly to the GND pin of the IC using a dedicatedw6T嘉泰姆
ground trace.w6T嘉泰姆
4. The VCC decoupling capacitor should be right next to the VCC and GND pins. Capacitor C2 should bew6T嘉泰姆
connected as close to the VIN and UGND pins as possible.w6T嘉泰姆
5. Place the decoupling ceramic capacitor C1 near the VIN as close as possible. The bulk capacitors C8 arew6T嘉泰姆
also placed near VIN. Use a wide power ground plane to connect the C1, C8, C4, and Schottky diode to pro-w6T嘉泰姆
vide a low impedance path between the components for large and high slew rate current.w6T嘉泰姆
八,相关产品 更多同类产品.......w6T嘉泰姆

Switching Regulator > Buck Converterw6T嘉泰姆
Part_No w6T嘉泰姆	Packagew6T嘉泰姆	Architectuw6T嘉泰姆	No.ofw6T嘉泰姆 PWM w6T嘉泰姆 Outpuw6T嘉泰姆	Drivew6T嘉泰姆 Loutw6T嘉泰姆 (A) w6T嘉泰姆	Vin(V) w6T嘉泰姆		Fmaxw6T嘉泰姆 Khz w6T嘉泰姆	Vref w6T嘉泰姆 (V) w6T嘉泰姆	R-Top (milohm) w6T嘉泰姆	R-Sync (milohm) w6T嘉泰姆	Iq (No load) (uA) w6T嘉泰姆
Part_No w6T嘉泰姆	Packagew6T嘉泰姆	Architectuw6T嘉泰姆	No.ofw6T嘉泰姆 PWM w6T嘉泰姆 Outpuw6T嘉泰姆	Drivew6T嘉泰姆 Loutw6T嘉泰姆 (A) w6T嘉泰姆	minw6T嘉泰姆	maxw6T嘉泰姆	Fmaxw6T嘉泰姆 Khz w6T嘉泰姆	Vref w6T嘉泰姆 (V) w6T嘉泰姆	R-Top (milohm) w6T嘉泰姆	R-Sync (milohm) w6T嘉泰姆	Iq (No load) (uA) w6T嘉泰姆
CXSD62122w6T嘉泰姆	TQFN5x6-28w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	5w6T嘉泰姆	4.5w6T嘉泰姆	26w6T嘉泰姆	380w6T嘉泰姆	0.8w6T嘉泰姆	50w6T嘉泰姆	20w6T嘉泰姆	1000w6T嘉泰姆
CXSD62123w6T嘉泰姆	SOP-8w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	2w6T嘉泰姆	4.5w6T嘉泰姆	26w6T嘉泰姆	380w6T嘉泰姆	0.8w6T嘉泰姆	100w6T嘉泰姆		1000w6T嘉泰姆
CXSD62124w6T嘉泰姆	SOP-8Pw6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	4w6T嘉泰姆	4.5w6T嘉泰姆	26w6T嘉泰姆	380w6T嘉泰姆	0.8w6T嘉泰姆	80w6T嘉泰姆		1000w6T嘉泰姆
CXSD62125w6T嘉泰姆	SOT23-5\|TSOT23-5w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆	25w6T嘉泰姆
CXSD62125Aw6T嘉泰姆	SOT23-5w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆
CXSD62126w6T嘉泰姆	SOP-8w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	3w6T嘉泰姆	4.3w6T嘉泰姆	14w6T嘉泰姆	500w6T嘉泰姆	0.8w6T嘉泰姆	70w6T嘉泰姆	70w6T嘉泰姆	500w6T嘉泰姆
CXSD62127w6T嘉泰姆	SOP-8Pw6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	3w6T嘉泰姆	4.3w6T嘉泰姆	14w6T嘉泰姆	500w6T嘉泰姆	0.8w6T嘉泰姆	55w6T嘉泰姆	45w6T嘉泰姆	500w6T嘉泰姆
CXSD62128Bw6T嘉泰姆	TDFN3x3-10w6T嘉泰姆			3w6T嘉泰姆	2.6w6T嘉泰姆	5.5w6T嘉泰姆	2000w6T嘉泰姆	0.8w6T嘉泰姆	110w6T嘉泰姆	110w6T嘉泰姆	460w6T嘉泰姆
CXSD62129w6T嘉泰姆	TDFN3x3-10w6T嘉泰姆	CMw6T嘉泰姆	2w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆	500w6T嘉泰姆
CXSD62129Aw6T嘉泰姆	TDFN3x3-10w6T嘉泰姆	CMw6T嘉泰姆	2w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆
CXSD62130w6T嘉泰姆	TDFN2x2-6w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆	25w6T嘉泰姆
CXSD62130Aw6T嘉泰姆	TDFN2x2-6w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆
CXSD62131w6T嘉泰姆	TDFN3x3-12w6T嘉泰姆	CMw6T嘉泰姆	2w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆	25w6T嘉泰姆
CXSD62131Aw6T嘉泰姆	TDFN3x3-12w6T嘉泰姆	CMw6T嘉泰姆	2w6T嘉泰姆	1w6T嘉泰姆	2.7w6T嘉泰姆	6w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆
CXSD62131Cw6T嘉泰姆	TDFN 3x3 12w6T嘉泰姆	CMw6T嘉泰姆	2w6T嘉泰姆	1w6T嘉泰姆	3w6T嘉泰姆	5.5w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆	30w6T嘉泰姆
CXSD62132w6T嘉泰姆	TQFN3x3-20w6T嘉泰姆	CMw6T嘉泰姆	3w6T嘉泰姆	2w6T嘉泰姆	2.9w6T嘉泰姆	5.5w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	-w6T嘉泰姆	-w6T嘉泰姆	300w6T嘉泰姆
CXSD62133w6T嘉泰姆	TDFN2x2-8w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	1w6T嘉泰姆	3.3w6T嘉泰姆	8w6T嘉泰姆	1500w6T嘉泰姆	0.6w6T嘉泰姆	280w6T嘉泰姆	250w6T嘉泰姆	25w6T嘉泰姆
CXSD62134w6T嘉泰姆	SOP-8w6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	2w6T嘉泰姆	4.5w6T嘉泰姆	24w6T嘉泰姆	340w6T嘉泰姆	0.925w6T嘉泰姆	110w6T嘉泰姆	110w6T嘉泰姆	1900w6T嘉泰姆
CXSD62135w6T嘉泰姆	SOP-8Pw6T嘉泰姆	CMw6T嘉泰姆	1w6T嘉泰姆	3w6T嘉泰姆	4.5w6T嘉泰姆	24w6T嘉泰姆	340w6T嘉泰姆	0.925w6T嘉泰姆	110w6T嘉泰姆	110w6T嘉泰姆	1900w6T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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