CXSD6293

CXSD6293将退出笔记本电脑中产生低压芯片组或RAM电源的高压计算机。PWM控制器运行固定的300kHz伪con-具有自适应恒定时间控制的恒频PWM。装置提供卓越的瞬态响应和精确的直流电压输出PFM或PWM模式。

CXSD6293单相的时间恒定的同步的驱动N通道mosfet的PWM控制器满足低输出电压应用的要求

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产品简介

目录Uyt嘉泰姆

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

一,产品概述(General Description)    Uyt嘉泰姆


      The CXSD6293 is a single-phase, constant-on-time, and  synchronousUyt嘉泰姆
PWM controller, which drives N-channel MOSFETs. An internal 0.5V temperature-compensated reference voltage with high accuracy is designed to meet theUyt嘉泰姆
requirement of low output voltage applications. The CXSD6293 steps downUyt嘉泰姆
high voltage to generate low-volt-age chipset or RAM supplies in notebookUyt嘉泰姆
computers.The PWM controller operates fixed 300kHz pseudo-con-Uyt嘉泰姆
stant frequency PWM with an adaptive constant-on-time control. The deviceUyt嘉泰姆
provides excellent transient response and accurate DC voltage output in eitherUyt嘉泰姆
PFM or PWM Mode. In Pulse Frequency Mode (PFM), the CXSD6293 pro-Uyt嘉泰姆
vides very high efficiency over light to heavy loads with loading-modulatedUyt嘉泰姆
switching frequencies. The device works in ultrasonic mode with PFM at noUyt嘉泰姆
load. The unique ultrasonic mode maintains the switching frequency aboveUyt嘉泰姆
20kHz, which eliminates noise in audio applications.Uyt嘉泰姆
          The CXSD6293 is equipped with accurate over-current,outputUyt嘉泰姆
under-voltage, and output over-voltage protections.A Power-On-ResetUyt嘉泰姆
function monitors the voltage on VCC to prevent wrong operation duringUyt嘉泰姆
power-on. The CXSD6293 has a 1.5ms digital soft-start to ramp up theUyt嘉泰姆
output voltage to reduce the start-up current. A soft-stop function activelyUyt嘉泰姆
discharges the output capacitors with controlled reverse inductor current.Uyt嘉泰姆
The CXSD6293 is available in TDFN3x3-10 packageUyt嘉泰姆
二.产品特点(Features)Uyt嘉泰姆


1.)Operates from An Input Battery Voltage Range of +3V to +25VUyt嘉泰姆
      ±0.6% 0.5V Reference Over Line, Load Regulation, andUyt嘉泰姆
      Operating Temp.
 Uyt嘉泰姆
2.)Drive Dual Low Cost N-Channel MOSFETsUyt嘉泰姆
    Adaptive Shoot-Through Protection Uyt嘉泰姆
3.)Power-On-Reset Monitoring on VCC PinUyt嘉泰姆
4.)PFM Mode for Increasing Light Load EfficiencyUyt嘉泰姆
5.)Constant-On-Time Control SchemeUyt嘉泰姆
     Switching Frequency Compensation for PWM OperationUyt嘉泰姆
6.)300kHz Constant Switching FrequencyUyt嘉泰姆
7.)Integrated MOSFET Drivers and Bootstrap DiodeUyt嘉泰姆
8.)Internal Soft-Start and Soft-StopUyt嘉泰姆
9.)Power Good MonitoringUyt嘉泰姆
10.)70% Under-Voltage ProtectionUyt嘉泰姆
11.)125% Over-Voltage ProtectionUyt嘉泰姆
     Using Low-Side MOSFET’s RDS(ON)Uyt嘉泰姆
12.)Over-Temperature ProtectionUyt嘉泰姆
13.)TDFN-10 3mmx3mm PackageUyt嘉泰姆
14.)Lead Free and Green Devices Available (RoHS Compliant)Uyt嘉泰姆
三,应用范围 (Applications)Uyt嘉泰姆


NotebookUyt嘉泰姆
Low Cost PCUyt嘉泰姆
Wide Input DC/DC RegulatorsUyt嘉泰姆
四.下载产品资料PDF文档 Uyt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Uyt嘉泰姆

 QQ截图20160419174301.jpgUyt嘉泰姆

五,产品封装图 (Package)Uyt嘉泰姆


Uyt嘉泰姆
blob.pngUyt嘉泰姆

六.电路原理图Uyt嘉泰姆


blob.pngUyt嘉泰姆
七,功能概述Uyt嘉泰姆


Constant-On-Time PWM Controller with Input Feed-For-wardUyt嘉泰姆
The constant-on-time control architecture is a pseudo-fixed frequency with input voltage feed-forward. This ar-Uyt嘉泰姆
chitecture relies on the output filter capacitor’s effective series resistance (ESR) to act as a current-sense resis-Uyt嘉泰姆
tor so the output ripple voltage provides the PWM ramp signal. In PFM operation, the high-side switch on-time isUyt嘉泰姆
controlled by the on-time generator is determined solely by a one-shot whose pulse width is inversely propor-Uyt嘉泰姆
tional to the input voltage and directly proportional to the output voltage. In PWM operation, the high-side switchUyt嘉泰姆
on-time is determined by a switching frequency control circuit in the on-time generator block.The switchingUyt嘉泰姆
frequency control circuit senses the switch-ing frequency of the high-side switch and keeps regulat-Uyt嘉泰姆
ing it at a constant frequency in PWM mode. The design improves the frequency variation and is more outstand-Uyt嘉泰姆
ing than a conventional constant-on-time controller, which has large switching frequency variation over inputUyt嘉泰姆

 voltage,output current, and temperature. Both in PFM and PWM,the on-time generator, which senses input Uyt嘉泰姆

voltage on PHASE pin, provides very fast on-time response to input line transients.Another one-shot sets a Uyt嘉泰姆

minimum off-time (typical:300ns). The on-time one-shot is triggered if the error com-parator is high, theUyt嘉泰姆

 low-side switch current is below the current-limit threshold, and the minimum off-time one-shot has Uyt嘉泰姆

timed out. Uyt嘉泰姆
Pulse-Frequency Modulation (PFM)Uyt嘉泰姆
In PFM mode, an automatic switchover to pulse-frequency modulation (PFM) takes place at light loads. ThisUyt嘉泰姆
switchover is affected by a comparator that truncates the low-side switch on-time at the inductor current zeroUyt嘉泰姆
crossing. This mechanism causes the threshold between PFM and PWM operation to coincide with the boundaryUyt嘉泰姆
between continuous and discontinuous inductor-current operation (also known as the critical conduction point).Uyt嘉泰姆
The on-time of PFM is given by:Uyt嘉泰姆
Ultrasonic ModeUyt嘉泰姆
The ultrasonic mode activates an unique PFM mode with a minimum switching frequency of 20kHz. The minimumUyt嘉泰姆
frequency 20kHz of ultrasonic mode eliminates audio-frequency interference in light load condition. It will transitUyt嘉泰姆
to unique PFM mode when output loading makes the frequency bigger than ultrasonic frequency.Uyt嘉泰姆
In ultrasonic mode, the controller automatically transits to fixed-frequency PWM operation when the load reachesUyt嘉泰姆
the same critical conduction point (ILOAD(PFM to PWM)).When the controller detects that no switching has oc-Uyt嘉泰姆
curred within about 40μs (Typical), an ultrasonic pulse will be occurred. The ultrasonic controller turns on theUyt嘉泰姆
low-side MOSFET firstly to reduce the output voltage. After feedback voltage drops below the internal referenceUyt嘉泰姆
voltage, the controller turns off the low-side MOSFET and triggers a constant-on-time. When the constant-on-Uyt嘉泰姆

time has expired, the controller turns on the low-side MOSFET again until the inductor current is below the Uyt嘉泰姆

zero-cross-ing threshold. The behavior is the same as PFM mode. Uyt嘉泰姆
Power-On-Reset (POR)Uyt嘉泰姆
A Power-On-Reset (POR) function is designed to prevent wrong logic controls when the VCC voltage is low. TheUyt嘉泰姆
POR function continually monitors the bias supply volt-age on the VCC pin if at least one of the enable pins is setUyt嘉泰姆
high. When the rising VCC voltage reaches the rising POR voltage threshold (4.2V, typical), the POR signal goesUyt嘉泰姆
high and the chip initiates soft-start operations. When this voltage drops lower than 4.0V (typical), the POR dis-Uyt嘉泰姆
ables the chip.Uyt嘉泰姆

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0.8Uyt嘉泰姆

5~12Uyt嘉泰姆

2000Uyt嘉泰姆

CXSD62102Uyt嘉泰姆

TQFN3x3-16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

30Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.6Uyt嘉泰姆

5Uyt嘉泰姆

600Uyt嘉泰姆

CXSD62102AUyt嘉泰姆

TQFN 3x3 16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

30Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.6Uyt嘉泰姆

5Uyt嘉泰姆

600Uyt嘉泰姆

CXSD62103Uyt嘉泰姆

QFN4x4-24Uyt嘉泰姆

VMUyt嘉泰姆

2Uyt嘉泰姆

1Uyt嘉泰姆

50Uyt嘉泰姆

4.5Uyt嘉泰姆

13.2Uyt嘉泰姆

0.6Uyt嘉泰姆

5~12Uyt嘉泰姆

5000Uyt嘉泰姆

CXSD62104Uyt嘉泰姆

TQFN4x4-24Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

15Uyt嘉泰姆

6Uyt嘉泰姆

25Uyt嘉泰姆

2Uyt嘉泰姆

NUyt嘉泰姆

550Uyt嘉泰姆

CXSD62105Uyt嘉泰姆

TQFN4x4-24Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

15Uyt嘉泰姆

6Uyt嘉泰姆

25Uyt嘉泰姆

2Uyt嘉泰姆

NUyt嘉泰姆

550Uyt嘉泰姆

CXSD62106|AUyt嘉泰姆

TQFN4x4-4Uyt嘉泰姆

TQFN3x3-20Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

20Uyt嘉泰姆

3Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

800Uyt嘉泰姆

CXSD62107Uyt嘉泰姆

TQFN3x3-16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

20Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

400Uyt嘉泰姆

CXSD62108Uyt嘉泰姆

QFN3.5x3.5-14Uyt嘉泰姆

TQFN3x3-16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

20Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

400Uyt嘉泰姆

CXSD62109Uyt嘉泰姆

TQFN3x3-16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

20Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

400Uyt嘉泰姆

CXSD62110Uyt嘉泰姆

QFN3x3-20Uyt嘉泰姆

TQFN3x3-16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

20Uyt嘉泰姆

3Uyt嘉泰姆

28Uyt嘉泰姆

1.8|1.5|0.5Uyt嘉泰姆

5Uyt嘉泰姆

740Uyt嘉泰姆

CXSD62111Uyt嘉泰姆

TQFN4x4-24Uyt嘉泰姆

|QFN3x3-20Uyt嘉泰姆

CMUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

15Uyt嘉泰姆

5Uyt嘉泰姆

28Uyt嘉泰姆

0.5Uyt嘉泰姆

NUyt嘉泰姆

3000Uyt嘉泰姆

CXSD62112Uyt嘉泰姆

TDFN3x3-10Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

20Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.5Uyt嘉泰姆

5Uyt嘉泰姆

250Uyt嘉泰姆

CXSD62113|CUyt嘉泰姆

TQFN3x3-20Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

15Uyt嘉泰姆

6Uyt嘉泰姆

25Uyt嘉泰姆

2Uyt嘉泰姆

NUyt嘉泰姆

550Uyt嘉泰姆

CXSD62113EUyt嘉泰姆

TQFN 3x3 20Uyt嘉泰姆

COTUyt嘉泰姆

2Uyt嘉泰姆

2Uyt嘉泰姆

11Uyt嘉泰姆

6Uyt嘉泰姆

25Uyt嘉泰姆

2Uyt嘉泰姆

NUyt嘉泰姆

550Uyt嘉泰姆

CXSD62114Uyt嘉泰姆

TQFN3x3-20Uyt嘉泰姆

COTUyt嘉泰姆

2Uyt嘉泰姆

2Uyt嘉泰姆

11Uyt嘉泰姆

5.5Uyt嘉泰姆

25Uyt嘉泰姆

2Uyt嘉泰姆

NUyt嘉泰姆

280Uyt嘉泰姆

CXSD62115Uyt嘉泰姆

QFN4x4-24Uyt嘉泰姆

VMUyt嘉泰姆

2Uyt嘉泰姆

1Uyt嘉泰姆

60Uyt嘉泰姆

3.1Uyt嘉泰姆

13.2Uyt嘉泰姆

0.85Uyt嘉泰姆

12Uyt嘉泰姆

5000Uyt嘉泰姆

CXSD62116A|B|CUyt嘉泰姆

SOP-8PUyt嘉泰姆

VMUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

20Uyt嘉泰姆

2.9Uyt嘉泰姆

13.2Uyt嘉泰姆

0.8Uyt嘉泰姆

12Uyt嘉泰姆

16000Uyt嘉泰姆

CXSD62117Uyt嘉泰姆

SOP-20Uyt嘉泰姆

VMUyt嘉泰姆

2Uyt嘉泰姆

2Uyt嘉泰姆

30Uyt嘉泰姆

10Uyt嘉泰姆

13.2Uyt嘉泰姆

1Uyt嘉泰姆

12Uyt嘉泰姆

5000Uyt嘉泰姆

CXSD62118Uyt嘉泰姆

TDFN3x3-10Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

1Uyt嘉泰姆

25Uyt嘉泰姆

1.8Uyt嘉泰姆

28Uyt嘉泰姆

0.7Uyt嘉泰姆

5Uyt嘉泰姆

250Uyt嘉泰姆

CXSD62119Uyt嘉泰姆

TQFN3x3-20Uyt嘉泰姆

COTUyt嘉泰姆

2Uyt嘉泰姆

1Uyt嘉泰姆

40Uyt嘉泰姆

1.8Uyt嘉泰姆

25Uyt嘉泰姆

REFIN SettingUyt嘉泰姆

5Uyt嘉泰姆

700Uyt嘉泰姆

CXSD62120Uyt嘉泰姆

QFN 3x3 20Uyt嘉泰姆

TQFN 3x3 16Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

20Uyt嘉泰姆

3Uyt嘉泰姆

28Uyt嘉泰姆

1.8|1.5 1.35|1.2 0.5Uyt嘉泰姆

5Uyt嘉泰姆

800Uyt嘉泰姆

CXSD62121AUyt嘉泰姆

TQFN3x3 20Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

15Uyt嘉泰姆

3Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

220Uyt嘉泰姆

CXSD62121BUyt嘉泰姆

TQFN3x3 20Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

15Uyt嘉泰姆

3Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

220Uyt嘉泰姆

CXSD62121Uyt嘉泰姆

TQFN3x3-20Uyt嘉泰姆

COTUyt嘉泰姆

1Uyt嘉泰姆

2Uyt嘉泰姆

20Uyt嘉泰姆

3Uyt嘉泰姆

28Uyt嘉泰姆

0.75Uyt嘉泰姆

5Uyt嘉泰姆

180Uyt嘉泰姆

 Uyt嘉泰姆

 Uyt嘉泰姆

 Uyt嘉泰姆

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