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首页 > 产品中心 > 电源管理 > DC降压型芯片 > Buck降压型芯片 >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
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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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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目录XFq嘉泰姆

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

一,产品概述(General Description)    XFq嘉泰姆


      The CXSD6293 is a single-phase, constant-on-time, and  synchronousXFq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 theXFq嘉泰姆
requirement of low output voltage applications. The CXSD6293 steps downXFq嘉泰姆
high voltage to generate low-volt-age chipset or RAM supplies in notebookXFq嘉泰姆
computers.The PWM controller operates fixed 300kHz pseudo-con-XFq嘉泰姆
stant frequency PWM with an adaptive constant-on-time control. The deviceXFq嘉泰姆
provides excellent transient response and accurate DC voltage output in eitherXFq嘉泰姆
PFM or PWM Mode. In Pulse Frequency Mode (PFM), the CXSD6293 pro-XFq嘉泰姆
vides very high efficiency over light to heavy loads with loading-modulatedXFq嘉泰姆
switching frequencies. The device works in ultrasonic mode with PFM at noXFq嘉泰姆
load. The unique ultrasonic mode maintains the switching frequency aboveXFq嘉泰姆
20kHz, which eliminates noise in audio applications.XFq嘉泰姆
          The CXSD6293 is equipped with accurate over-current,outputXFq嘉泰姆
under-voltage, and output over-voltage protections.A Power-On-ResetXFq嘉泰姆
function monitors the voltage on VCC to prevent wrong operation duringXFq嘉泰姆
power-on. The CXSD6293 has a 1.5ms digital soft-start to ramp up theXFq嘉泰姆
output voltage to reduce the start-up current. A soft-stop function activelyXFq嘉泰姆
discharges the output capacitors with controlled reverse inductor current.XFq嘉泰姆
The CXSD6293 is available in TDFN3x3-10 packageXFq嘉泰姆
二.产品特点(Features)XFq嘉泰姆


1.)Operates from An Input Battery Voltage Range of +3V to +25VXFq嘉泰姆
      ±0.6% 0.5V Reference Over Line, Load Regulation, andXFq嘉泰姆
      Operating Temp.
 XFq嘉泰姆
2.)Drive Dual Low Cost N-Channel MOSFETsXFq嘉泰姆
    Adaptive Shoot-Through Protection XFq嘉泰姆
3.)Power-On-Reset Monitoring on VCC PinXFq嘉泰姆
4.)PFM Mode for Increasing Light Load EfficiencyXFq嘉泰姆
5.)Constant-On-Time Control SchemeXFq嘉泰姆
     Switching Frequency Compensation for PWM OperationXFq嘉泰姆
6.)300kHz Constant Switching FrequencyXFq嘉泰姆
7.)Integrated MOSFET Drivers and Bootstrap DiodeXFq嘉泰姆
8.)Internal Soft-Start and Soft-StopXFq嘉泰姆
9.)Power Good MonitoringXFq嘉泰姆
10.)70% Under-Voltage ProtectionXFq嘉泰姆
11.)125% Over-Voltage ProtectionXFq嘉泰姆
     Using Low-Side MOSFET’s RDS(ON)XFq嘉泰姆
12.)Over-Temperature ProtectionXFq嘉泰姆
13.)TDFN-10 3mmx3mm PackageXFq嘉泰姆
14.)Lead Free and Green Devices Available (RoHS Compliant)XFq嘉泰姆
三,应用范围 (Applications)XFq嘉泰姆


NotebookXFq嘉泰姆
Low Cost PCXFq嘉泰姆
Wide Input DC/DC RegulatorsXFq嘉泰姆
四.下载产品资料PDF文档 XFq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XFq嘉泰姆

 QQ截图20160419174301.jpgXFq嘉泰姆

五,产品封装图 (Package)XFq嘉泰姆


XFq嘉泰姆
blob.pngXFq嘉泰姆

六.电路原理图XFq嘉泰姆


blob.pngXFq嘉泰姆
七,功能概述XFq嘉泰姆


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

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

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

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

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

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

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

zero-cross-ing threshold. The behavior is the same as PFM mode. XFq嘉泰姆
Power-On-Reset (POR)XFq嘉泰姆
A Power-On-Reset (POR) function is designed to prevent wrong logic controls when the VCC voltage is low. TheXFq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 setXFq嘉泰姆
high. When the rising VCC voltage reaches the rising POR voltage threshold (4.2V, typical), the POR signal goesXFq嘉泰姆
high and the chip initiates soft-start operations. When this voltage drops lower than 4.0V (typical), the POR dis-XFq嘉泰姆
ables the chip.XFq嘉泰姆

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13.2XFq嘉泰姆

0.8XFq嘉泰姆

5~12XFq嘉泰姆

2000XFq嘉泰姆

CXSD6298XFq嘉泰姆

TDFN3x3-10XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

25XFq嘉泰姆

4.5XFq嘉泰姆

25XFq嘉泰姆

0.6XFq嘉泰姆

5~12XFq嘉泰姆

80XFq嘉泰姆

CXSD6299|AXFq嘉泰姆

SOP-8PXFq嘉泰姆

VMXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

25XFq嘉泰姆

4.5XFq嘉泰姆

13.2XFq嘉泰姆

0.8XFq嘉泰姆

5~12XFq嘉泰姆

16000XFq嘉泰姆

CXSD62100XFq嘉泰姆

TQFN3x3-10XFq嘉泰姆

VMXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

25XFq嘉泰姆

4.5XFq嘉泰姆

13.2XFq嘉泰姆

0.6XFq嘉泰姆

5~12XFq嘉泰姆

2500XFq嘉泰姆

CXSD62101|LXFq嘉泰姆

TDFN3x3-10XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

30XFq嘉泰姆

3XFq嘉泰姆

25XFq嘉泰姆

0.8XFq嘉泰姆

5~12XFq嘉泰姆

2000XFq嘉泰姆

CXSD62102XFq嘉泰姆

TQFN3x3-16XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

30XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.6XFq嘉泰姆

5XFq嘉泰姆

600XFq嘉泰姆

CXSD62102AXFq嘉泰姆

TQFN 3x3 16XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

30XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.6XFq嘉泰姆

5XFq嘉泰姆

600XFq嘉泰姆

CXSD62103XFq嘉泰姆

QFN4x4-24XFq嘉泰姆

VMXFq嘉泰姆

2XFq嘉泰姆

1XFq嘉泰姆

50XFq嘉泰姆

4.5XFq嘉泰姆

13.2XFq嘉泰姆

0.6XFq嘉泰姆

5~12XFq嘉泰姆

5000XFq嘉泰姆

CXSD62104XFq嘉泰姆

TQFN4x4-24XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

15XFq嘉泰姆

6XFq嘉泰姆

25XFq嘉泰姆

2XFq嘉泰姆

NXFq嘉泰姆

550XFq嘉泰姆

CXSD62105XFq嘉泰姆

TQFN4x4-24XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

15XFq嘉泰姆

6XFq嘉泰姆

25XFq嘉泰姆

2XFq嘉泰姆

NXFq嘉泰姆

550XFq嘉泰姆

CXSD62106|AXFq嘉泰姆

TQFN4x4-4XFq嘉泰姆

TQFN3x3-20XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

20XFq嘉泰姆

3XFq嘉泰姆

28XFq嘉泰姆

0.75XFq嘉泰姆

5XFq嘉泰姆

800XFq嘉泰姆

CXSD62107XFq嘉泰姆

TQFN3x3-16XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

20XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.75XFq嘉泰姆

5XFq嘉泰姆

400XFq嘉泰姆

CXSD62108XFq嘉泰姆

QFN3.5x3.5-14XFq嘉泰姆

TQFN3x3-16XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

20XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.75XFq嘉泰姆

5XFq嘉泰姆

400XFq嘉泰姆

CXSD62109XFq嘉泰姆

TQFN3x3-16XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

20XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.75XFq嘉泰姆

5XFq嘉泰姆

400XFq嘉泰姆

CXSD62110XFq嘉泰姆

QFN3x3-20XFq嘉泰姆

TQFN3x3-16XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

20XFq嘉泰姆

3XFq嘉泰姆

28XFq嘉泰姆

1.8|1.5|0.5XFq嘉泰姆

5XFq嘉泰姆

740XFq嘉泰姆

CXSD62111XFq嘉泰姆

TQFN4x4-24XFq嘉泰姆

|QFN3x3-20XFq嘉泰姆

CMXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

15XFq嘉泰姆

5XFq嘉泰姆

28XFq嘉泰姆

0.5XFq嘉泰姆

NXFq嘉泰姆

3000XFq嘉泰姆

CXSD62112XFq嘉泰姆

TDFN3x3-10XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

20XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.5XFq嘉泰姆

5XFq嘉泰姆

250XFq嘉泰姆

CXSD62113|CXFq嘉泰姆

TQFN3x3-20XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

15XFq嘉泰姆

6XFq嘉泰姆

25XFq嘉泰姆

2XFq嘉泰姆

NXFq嘉泰姆

550XFq嘉泰姆

CXSD62113EXFq嘉泰姆

TQFN 3x3 20XFq嘉泰姆

COTXFq嘉泰姆

2XFq嘉泰姆

2XFq嘉泰姆

11XFq嘉泰姆

6XFq嘉泰姆

25XFq嘉泰姆

2XFq嘉泰姆

NXFq嘉泰姆

550XFq嘉泰姆

CXSD62114XFq嘉泰姆

TQFN3x3-20XFq嘉泰姆

COTXFq嘉泰姆

2XFq嘉泰姆

2XFq嘉泰姆

11XFq嘉泰姆

5.5XFq嘉泰姆

25XFq嘉泰姆

2XFq嘉泰姆

NXFq嘉泰姆

280XFq嘉泰姆

CXSD62115XFq嘉泰姆

QFN4x4-24XFq嘉泰姆

VMXFq嘉泰姆

2XFq嘉泰姆

1XFq嘉泰姆

60XFq嘉泰姆

3.1XFq嘉泰姆

13.2XFq嘉泰姆

0.85XFq嘉泰姆

12XFq嘉泰姆

5000XFq嘉泰姆

CXSD62116A|B|CXFq嘉泰姆

SOP-8PXFq嘉泰姆

VMXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

20XFq嘉泰姆

2.9XFq嘉泰姆

13.2XFq嘉泰姆

0.8XFq嘉泰姆

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16000XFq嘉泰姆

CXSD62117XFq嘉泰姆

SOP-20XFq嘉泰姆

VMXFq嘉泰姆

2XFq嘉泰姆

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30XFq嘉泰姆

10XFq嘉泰姆

13.2XFq嘉泰姆

1XFq嘉泰姆

12XFq嘉泰姆

5000XFq嘉泰姆

CXSD62118XFq嘉泰姆

TDFN3x3-10XFq嘉泰姆

COTXFq嘉泰姆

1XFq嘉泰姆

1XFq嘉泰姆

25XFq嘉泰姆

1.8XFq嘉泰姆

28XFq嘉泰姆

0.7XFq嘉泰姆

5XFq嘉泰姆

250XFq嘉泰姆

CXSD62119XFq嘉泰姆

TQFN3x3-20XFq嘉泰姆

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1XFq嘉泰姆

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1.8XFq嘉泰姆

25XFq嘉泰姆

REFIN SettingXFq嘉泰姆

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700XFq嘉泰姆

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1.8|1.5 1.35|1.2 0.5XFq嘉泰姆

5XFq嘉泰姆

800XFq嘉泰姆

CXSD62121AXFq嘉泰姆

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COTXFq嘉泰姆

1XFq嘉泰姆

2XFq嘉泰姆

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28XFq嘉泰姆

0.75XFq嘉泰姆

5XFq嘉泰姆

220XFq嘉泰姆

CXSD62121BXFq嘉泰姆

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