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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:151
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vDN嘉泰姆

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

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

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

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

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

system solution with minimal exter-nal components.vDN嘉泰姆
二.产品特点(Features)vDN嘉泰姆
Wide Input Voltage from 4.5V to 26VvDN嘉泰姆
Output Current up to 2AvDN嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINvDN嘉泰姆
- 0.8V Reference VoltagevDN嘉泰姆
- ±2.5% System AccuracyvDN嘉泰姆
100m Integrated P-Channel Power MOSFETvDN嘉泰姆
High Efficiency up to 91%vDN嘉泰姆
- Pulse-Skipping Mode (PSM) / PWM Mode Op-erationvDN嘉泰姆
Current-Mode OperationvDN嘉泰姆
- Stable with Ceramic Output CapacitorsvDN嘉泰姆
- Fast Transient ResponsevDN嘉泰姆
Power-On-Reset MonitoringvDN嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModevDN嘉泰姆
Built-in Digital Soft-StartvDN嘉泰姆
Output Current-Limit Protection with Frequency FoldbackvDN嘉泰姆
70% Under-Voltage ProtectionvDN嘉泰姆
Over-Temperature ProtectionvDN嘉泰姆
<5μA Quiescent Current During Shutdown SOP-8 PackagevDN嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)vDN嘉泰姆
三,应用范围 (Applications)vDN嘉泰姆
LCD Monitor / TVvDN嘉泰姆
Set-Top BoxvDN嘉泰姆
Portable DVDvDN嘉泰姆
Wireless LANvDN嘉泰姆
ADSL, Switch HUBvDN嘉泰姆
Notebook ComputervDN嘉泰姆
Step-Down Converters Requiring High Efficiency and 2A Output CurrentvDN嘉泰姆

四.下载产品资料PDF文档 vDN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vDN嘉泰姆

 QQ截图20160419174301.jpgvDN嘉泰姆

五,产品封装图 (Package)vDN嘉泰姆

vDN嘉泰姆
六.电路原理图vDN嘉泰姆
blob.pngvDN嘉泰姆
blob.pngvDN嘉泰姆

七,功能概述vDN嘉泰姆


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


Switching Regulator > Buck ConvertervDN嘉泰姆

 Part_No vDN嘉泰姆

 PackagevDN嘉泰姆

ArchitectuvDN嘉泰姆

No.ofvDN嘉泰姆

PWM vDN嘉泰姆

OutpuvDN嘉泰姆

DrivevDN嘉泰姆

LoutvDN嘉泰姆

(A) vDN嘉泰姆

Vin(V) vDN嘉泰姆

FmaxvDN嘉泰姆

Khz vDN嘉泰姆

Vref vDN嘉泰姆

(V) vDN嘉泰姆

R-Top (milohm) vDN嘉泰姆

R-Sync (milohm) vDN嘉泰姆

Iq (No load) (uA) vDN嘉泰姆

minvDN嘉泰姆

maxvDN嘉泰姆

CXSD62122vDN嘉泰姆

TQFN5x6-28vDN嘉泰姆

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4.5vDN嘉泰姆

26vDN嘉泰姆

380vDN嘉泰姆

0.8vDN嘉泰姆

50vDN嘉泰姆

20vDN嘉泰姆

1000vDN嘉泰姆

CXSD62123vDN嘉泰姆

SOP-8vDN嘉泰姆

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4.5vDN嘉泰姆

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100vDN嘉泰姆

 

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500vDN嘉泰姆

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14vDN嘉泰姆

500vDN嘉泰姆

0.8vDN嘉泰姆

55vDN嘉泰姆

45vDN嘉泰姆

500vDN嘉泰姆

CXSD62128BvDN嘉泰姆

TDFN3x3-10vDN嘉泰姆

   

3vDN嘉泰姆

2.6vDN嘉泰姆

5.5vDN嘉泰姆

2000vDN嘉泰姆

0.8vDN嘉泰姆

110vDN嘉泰姆

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460vDN嘉泰姆

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TDFN3x3-10vDN嘉泰姆

CMvDN嘉泰姆

2vDN嘉泰姆

1vDN嘉泰姆

2.7vDN嘉泰姆

6vDN嘉泰姆

1500vDN嘉泰姆

0.6vDN嘉泰姆

280vDN嘉泰姆

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2vDN嘉泰姆

1vDN嘉泰姆

2.7vDN嘉泰姆

6vDN嘉泰姆

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0.6vDN嘉泰姆

280vDN嘉泰姆

250vDN嘉泰姆

 

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TDFN2x2-6vDN嘉泰姆

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1vDN嘉泰姆

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6vDN嘉泰姆

1500vDN嘉泰姆

0.6vDN嘉泰姆

280vDN嘉泰姆

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CMvDN嘉泰姆

1vDN嘉泰姆

1vDN嘉泰姆

2.7vDN嘉泰姆

6vDN嘉泰姆

1500vDN嘉泰姆

0.6vDN嘉泰姆

280vDN嘉泰姆

250vDN嘉泰姆

 

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2vDN嘉泰姆

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2vDN嘉泰姆

1vDN嘉泰姆

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0.6vDN嘉泰姆

280vDN嘉泰姆

250vDN嘉泰姆

 

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TDFN 3x3 12vDN嘉泰姆

CMvDN嘉泰姆

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1vDN嘉泰姆

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