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：58

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qwM嘉泰姆

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

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

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

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

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

system solution with minimal exter-nal components.qwM嘉泰姆
二.产品特点(Features)qwM嘉泰姆
Wide Input Voltage from 4.5V to 26VqwM嘉泰姆
Output Current up to 2AqwM嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINqwM嘉泰姆
- 0.8V Reference VoltageqwM嘉泰姆
- ±2.5% System AccuracyqwM嘉泰姆
100mΩ Integrated P-Channel Power MOSFETqwM嘉泰姆
High Efficiency up to 91%qwM嘉泰姆
- Pulse-Skipping Mode (PSM) / PWM Mode Op-erationqwM嘉泰姆
Current-Mode OperationqwM嘉泰姆
- Stable with Ceramic Output CapacitorsqwM嘉泰姆
- Fast Transient ResponseqwM嘉泰姆
Power-On-Reset MonitoringqwM嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModeqwM嘉泰姆
Built-in Digital Soft-StartqwM嘉泰姆
Output Current-Limit Protection with Frequency FoldbackqwM嘉泰姆
70% Under-Voltage ProtectionqwM嘉泰姆
Over-Temperature ProtectionqwM嘉泰姆
<5μA Quiescent Current During Shutdown SOP-8 PackageqwM嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)qwM嘉泰姆
三,应用范围 (Applications)qwM嘉泰姆
LCD Monitor / TVqwM嘉泰姆
Set-Top BoxqwM嘉泰姆
Portable DVDqwM嘉泰姆
Wireless LANqwM嘉泰姆
ADSL, Switch HUBqwM嘉泰姆
Notebook ComputerqwM嘉泰姆
Step-Down Converters Requiring High Efficiency and 2A Output CurrentqwM嘉泰姆

四.下载产品资料PDF文档 qwM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！qwM嘉泰姆

QQ截图20160419174301.jpg qwM嘉泰姆

五,产品封装图 (Package)qwM嘉泰姆

qwM嘉泰姆
六.电路原理图qwM嘉泰姆
qwM嘉泰姆
qwM嘉泰姆

七,功能概述qwM嘉泰姆

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

Switching Regulator > Buck ConverterqwM嘉泰姆
Part_No qwM嘉泰姆	PackageqwM嘉泰姆	ArchitectuqwM嘉泰姆	No.ofqwM嘉泰姆 PWM qwM嘉泰姆 OutpuqwM嘉泰姆	DriveqwM嘉泰姆 LoutqwM嘉泰姆 (A) qwM嘉泰姆	Vin(V) qwM嘉泰姆		FmaxqwM嘉泰姆 Khz qwM嘉泰姆	Vref qwM嘉泰姆 (V) qwM嘉泰姆	R-Top (milohm) qwM嘉泰姆	R-Sync (milohm) qwM嘉泰姆	Iq (No load) (uA) qwM嘉泰姆
Part_No qwM嘉泰姆	PackageqwM嘉泰姆	ArchitectuqwM嘉泰姆	No.ofqwM嘉泰姆 PWM qwM嘉泰姆 OutpuqwM嘉泰姆	DriveqwM嘉泰姆 LoutqwM嘉泰姆 (A) qwM嘉泰姆	minqwM嘉泰姆	maxqwM嘉泰姆	FmaxqwM嘉泰姆 Khz qwM嘉泰姆	Vref qwM嘉泰姆 (V) qwM嘉泰姆	R-Top (milohm) qwM嘉泰姆	R-Sync (milohm) qwM嘉泰姆	Iq (No load) (uA) qwM嘉泰姆
CXSD62122qwM嘉泰姆	TQFN5x6-28qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	5qwM嘉泰姆	4.5qwM嘉泰姆	26qwM嘉泰姆	380qwM嘉泰姆	0.8qwM嘉泰姆	50qwM嘉泰姆	20qwM嘉泰姆	1000qwM嘉泰姆
CXSD62123qwM嘉泰姆	SOP-8qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	2qwM嘉泰姆	4.5qwM嘉泰姆	26qwM嘉泰姆	380qwM嘉泰姆	0.8qwM嘉泰姆	100qwM嘉泰姆		1000qwM嘉泰姆
CXSD62124qwM嘉泰姆	SOP-8PqwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	4qwM嘉泰姆	4.5qwM嘉泰姆	26qwM嘉泰姆	380qwM嘉泰姆	0.8qwM嘉泰姆	80qwM嘉泰姆		1000qwM嘉泰姆
CXSD62125qwM嘉泰姆	SOT23-5\|TSOT23-5qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆	25qwM嘉泰姆
CXSD62125AqwM嘉泰姆	SOT23-5qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆
CXSD62126qwM嘉泰姆	SOP-8qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	3qwM嘉泰姆	4.3qwM嘉泰姆	14qwM嘉泰姆	500qwM嘉泰姆	0.8qwM嘉泰姆	70qwM嘉泰姆	70qwM嘉泰姆	500qwM嘉泰姆
CXSD62127qwM嘉泰姆	SOP-8PqwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	3qwM嘉泰姆	4.3qwM嘉泰姆	14qwM嘉泰姆	500qwM嘉泰姆	0.8qwM嘉泰姆	55qwM嘉泰姆	45qwM嘉泰姆	500qwM嘉泰姆
CXSD62128BqwM嘉泰姆	TDFN3x3-10qwM嘉泰姆			3qwM嘉泰姆	2.6qwM嘉泰姆	5.5qwM嘉泰姆	2000qwM嘉泰姆	0.8qwM嘉泰姆	110qwM嘉泰姆	110qwM嘉泰姆	460qwM嘉泰姆
CXSD62129qwM嘉泰姆	TDFN3x3-10qwM嘉泰姆	CMqwM嘉泰姆	2qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆	500qwM嘉泰姆
CXSD62129AqwM嘉泰姆	TDFN3x3-10qwM嘉泰姆	CMqwM嘉泰姆	2qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆
CXSD62130qwM嘉泰姆	TDFN2x2-6qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆	25qwM嘉泰姆
CXSD62130AqwM嘉泰姆	TDFN2x2-6qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆
CXSD62131qwM嘉泰姆	TDFN3x3-12qwM嘉泰姆	CMqwM嘉泰姆	2qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆	25qwM嘉泰姆
CXSD62131AqwM嘉泰姆	TDFN3x3-12qwM嘉泰姆	CMqwM嘉泰姆	2qwM嘉泰姆	1qwM嘉泰姆	2.7qwM嘉泰姆	6qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆
CXSD62131CqwM嘉泰姆	TDFN 3x3 12qwM嘉泰姆	CMqwM嘉泰姆	2qwM嘉泰姆	1qwM嘉泰姆	3qwM嘉泰姆	5.5qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆	30qwM嘉泰姆
CXSD62132qwM嘉泰姆	TQFN3x3-20qwM嘉泰姆	CMqwM嘉泰姆	3qwM嘉泰姆	2qwM嘉泰姆	2.9qwM嘉泰姆	5.5qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	-qwM嘉泰姆	-qwM嘉泰姆	300qwM嘉泰姆
CXSD62133qwM嘉泰姆	TDFN2x2-8qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	1qwM嘉泰姆	3.3qwM嘉泰姆	8qwM嘉泰姆	1500qwM嘉泰姆	0.6qwM嘉泰姆	280qwM嘉泰姆	250qwM嘉泰姆	25qwM嘉泰姆
CXSD62134qwM嘉泰姆	SOP-8qwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	2qwM嘉泰姆	4.5qwM嘉泰姆	24qwM嘉泰姆	340qwM嘉泰姆	0.925qwM嘉泰姆	110qwM嘉泰姆	110qwM嘉泰姆	1900qwM嘉泰姆
CXSD62135qwM嘉泰姆	SOP-8PqwM嘉泰姆	CMqwM嘉泰姆	1qwM嘉泰姆	3qwM嘉泰姆	4.5qwM嘉泰姆	24qwM嘉泰姆	340qwM嘉泰姆	0.925qwM嘉泰姆	110qwM嘉泰姆	110qwM嘉泰姆	1900qwM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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