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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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产品简介

目录6zC嘉泰姆

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

一,产品概述(General Description)    6zC嘉泰姆


      The CXSD6293 is a single-phase, constant-on-time, and  synchronous6zC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 the6zC嘉泰姆
requirement of low output voltage applications. The CXSD6293 steps down6zC嘉泰姆
high voltage to generate low-volt-age chipset or RAM supplies in notebook6zC嘉泰姆
computers.The PWM controller operates fixed 300kHz pseudo-con-6zC嘉泰姆
stant frequency PWM with an adaptive constant-on-time control. The device6zC嘉泰姆
provides excellent transient response and accurate DC voltage output in either6zC嘉泰姆
PFM or PWM Mode. In Pulse Frequency Mode (PFM), the CXSD6293 pro-6zC嘉泰姆
vides very high efficiency over light to heavy loads with loading-modulated6zC嘉泰姆
switching frequencies. The device works in ultrasonic mode with PFM at no6zC嘉泰姆
load. The unique ultrasonic mode maintains the switching frequency above6zC嘉泰姆
20kHz, which eliminates noise in audio applications.6zC嘉泰姆
          The CXSD6293 is equipped with accurate over-current,output6zC嘉泰姆
under-voltage, and output over-voltage protections.A Power-On-Reset6zC嘉泰姆
function monitors the voltage on VCC to prevent wrong operation during6zC嘉泰姆
power-on. The CXSD6293 has a 1.5ms digital soft-start to ramp up the6zC嘉泰姆
output voltage to reduce the start-up current. A soft-stop function actively6zC嘉泰姆
discharges the output capacitors with controlled reverse inductor current.6zC嘉泰姆
The CXSD6293 is available in TDFN3x3-10 package6zC嘉泰姆
二.产品特点(Features)6zC嘉泰姆


1.)Operates from An Input Battery Voltage Range of +3V to +25V6zC嘉泰姆
      ±0.6% 0.5V Reference Over Line, Load Regulation, and6zC嘉泰姆
      Operating Temp.
 6zC嘉泰姆
2.)Drive Dual Low Cost N-Channel MOSFETs6zC嘉泰姆
    Adaptive Shoot-Through Protection 6zC嘉泰姆
3.)Power-On-Reset Monitoring on VCC Pin6zC嘉泰姆
4.)PFM Mode for Increasing Light Load Efficiency6zC嘉泰姆
5.)Constant-On-Time Control Scheme6zC嘉泰姆
     Switching Frequency Compensation for PWM Operation6zC嘉泰姆
6.)300kHz Constant Switching Frequency6zC嘉泰姆
7.)Integrated MOSFET Drivers and Bootstrap Diode6zC嘉泰姆
8.)Internal Soft-Start and Soft-Stop6zC嘉泰姆
9.)Power Good Monitoring6zC嘉泰姆
10.)70% Under-Voltage Protection6zC嘉泰姆
11.)125% Over-Voltage Protection6zC嘉泰姆
     Using Low-Side MOSFET’s RDS(ON)6zC嘉泰姆
12.)Over-Temperature Protection6zC嘉泰姆
13.)TDFN-10 3mmx3mm Package6zC嘉泰姆
14.)Lead Free and Green Devices Available (RoHS Compliant)6zC嘉泰姆
三,应用范围 (Applications)6zC嘉泰姆


Notebook6zC嘉泰姆
Low Cost PC6zC嘉泰姆
Wide Input DC/DC Regulators6zC嘉泰姆
四.下载产品资料PDF文档 6zC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6zC嘉泰姆

 QQ截图20160419174301.jpg6zC嘉泰姆

五,产品封装图 (Package)6zC嘉泰姆


6zC嘉泰姆
blob.png6zC嘉泰姆

六.电路原理图6zC嘉泰姆


blob.png6zC嘉泰姆
七,功能概述6zC嘉泰姆


Constant-On-Time PWM Controller with Input Feed-For-ward6zC嘉泰姆
The constant-on-time control architecture is a pseudo-fixed frequency with input voltage feed-forward. This ar-6zC嘉泰姆
chitecture relies on the output filter capacitor’s effective series resistance (ESR) to act as a current-sense resis-6zC嘉泰姆
tor so the output ripple voltage provides the PWM ramp signal. In PFM operation, the high-side switch on-time is6zC嘉泰姆
controlled by the on-time generator is determined solely by a one-shot whose pulse width is inversely propor-6zC嘉泰姆
tional to the input voltage and directly proportional to the output voltage. In PWM operation, the high-side switch6zC嘉泰姆
on-time is determined by a switching frequency control circuit in the on-time generator block.The switching6zC嘉泰姆
frequency control circuit senses the switch-ing frequency of the high-side switch and keeps regulat-6zC嘉泰姆
ing it at a constant frequency in PWM mode. The design improves the frequency variation and is more outstand-6zC嘉泰姆
ing than a conventional constant-on-time controller, which has large switching frequency variation over input6zC嘉泰姆

 voltage,output current, and temperature. Both in PFM and PWM,the on-time generator, which senses input 6zC嘉泰姆

voltage on PHASE pin, provides very fast on-time response to input line transients.Another one-shot sets a 6zC嘉泰姆

minimum off-time (typical:300ns). The on-time one-shot is triggered if the error com-parator is high, the6zC嘉泰姆

 low-side switch current is below the current-limit threshold, and the minimum off-time one-shot has 6zC嘉泰姆

timed out. 6zC嘉泰姆
Pulse-Frequency Modulation (PFM)6zC嘉泰姆
In PFM mode, an automatic switchover to pulse-frequency modulation (PFM) takes place at light loads. This6zC嘉泰姆
switchover is affected by a comparator that truncates the low-side switch on-time at the inductor current zero6zC嘉泰姆
crossing. This mechanism causes the threshold between PFM and PWM operation to coincide with the boundary6zC嘉泰姆
between continuous and discontinuous inductor-current operation (also known as the critical conduction point).6zC嘉泰姆
The on-time of PFM is given by:6zC嘉泰姆
Ultrasonic Mode6zC嘉泰姆
The ultrasonic mode activates an unique PFM mode with a minimum switching frequency of 20kHz. The minimum6zC嘉泰姆
frequency 20kHz of ultrasonic mode eliminates audio-frequency interference in light load condition. It will transit6zC嘉泰姆
to unique PFM mode when output loading makes the frequency bigger than ultrasonic frequency.6zC嘉泰姆
In ultrasonic mode, the controller automatically transits to fixed-frequency PWM operation when the load reaches6zC嘉泰姆
the same critical conduction point (ILOAD(PFM to PWM)).When the controller detects that no switching has oc-6zC嘉泰姆
curred within about 40μs (Typical), an ultrasonic pulse will be occurred. The ultrasonic controller turns on the6zC嘉泰姆
low-side MOSFET firstly to reduce the output voltage. After feedback voltage drops below the internal reference6zC嘉泰姆
voltage, the controller turns off the low-side MOSFET and triggers a constant-on-time. When the constant-on-6zC嘉泰姆

time has expired, the controller turns on the low-side MOSFET again until the inductor current is below the 6zC嘉泰姆

zero-cross-ing threshold. The behavior is the same as PFM mode. 6zC嘉泰姆
Power-On-Reset (POR)6zC嘉泰姆
A Power-On-Reset (POR) function is designed to prevent wrong logic controls when the VCC voltage is low. The6zC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 set6zC嘉泰姆
high. When the rising VCC voltage reaches the rising POR voltage threshold (4.2V, typical), the POR signal goes6zC嘉泰姆
high and the chip initiates soft-start operations. When this voltage drops lower than 4.0V (typical), the POR dis-6zC嘉泰姆
ables the chip.6zC嘉泰姆

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VM6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

256zC嘉泰姆

4.56zC嘉泰姆

13.26zC嘉泰姆

0.86zC嘉泰姆

5~126zC嘉泰姆

160006zC嘉泰姆

CXSD621006zC嘉泰姆

TQFN3x3-106zC嘉泰姆

VM6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

256zC嘉泰姆

4.56zC嘉泰姆

13.26zC嘉泰姆

0.66zC嘉泰姆

5~126zC嘉泰姆

25006zC嘉泰姆

CXSD62101|L6zC嘉泰姆

TDFN3x3-106zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

306zC嘉泰姆

36zC嘉泰姆

256zC嘉泰姆

0.86zC嘉泰姆

5~126zC嘉泰姆

20006zC嘉泰姆

CXSD621026zC嘉泰姆

TQFN3x3-166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

306zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.66zC嘉泰姆

56zC嘉泰姆

6006zC嘉泰姆

CXSD62102A6zC嘉泰姆

TQFN 3x3 166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

306zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.66zC嘉泰姆

56zC嘉泰姆

6006zC嘉泰姆

CXSD621036zC嘉泰姆

QFN4x4-246zC嘉泰姆

VM6zC嘉泰姆

26zC嘉泰姆

16zC嘉泰姆

506zC嘉泰姆

4.56zC嘉泰姆

13.26zC嘉泰姆

0.66zC嘉泰姆

5~126zC嘉泰姆

50006zC嘉泰姆

CXSD621046zC嘉泰姆

TQFN4x4-246zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

156zC嘉泰姆

66zC嘉泰姆

256zC嘉泰姆

26zC嘉泰姆

N6zC嘉泰姆

5506zC嘉泰姆

CXSD621056zC嘉泰姆

TQFN4x4-246zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

156zC嘉泰姆

66zC嘉泰姆

256zC嘉泰姆

26zC嘉泰姆

N6zC嘉泰姆

5506zC嘉泰姆

CXSD62106|A6zC嘉泰姆

TQFN4x4-46zC嘉泰姆

TQFN3x3-206zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

206zC嘉泰姆

36zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

8006zC嘉泰姆

CXSD621076zC嘉泰姆

TQFN3x3-166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

206zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

4006zC嘉泰姆

CXSD621086zC嘉泰姆

QFN3.5x3.5-146zC嘉泰姆

TQFN3x3-166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

206zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

4006zC嘉泰姆

CXSD621096zC嘉泰姆

TQFN3x3-166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

206zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

4006zC嘉泰姆

CXSD621106zC嘉泰姆

QFN3x3-206zC嘉泰姆

TQFN3x3-166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

206zC嘉泰姆

36zC嘉泰姆

286zC嘉泰姆

1.8|1.5|0.56zC嘉泰姆

56zC嘉泰姆

7406zC嘉泰姆

CXSD621116zC嘉泰姆

TQFN4x4-246zC嘉泰姆

|QFN3x3-206zC嘉泰姆

CM6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

156zC嘉泰姆

56zC嘉泰姆

286zC嘉泰姆

0.56zC嘉泰姆

N6zC嘉泰姆

30006zC嘉泰姆

CXSD621126zC嘉泰姆

TDFN3x3-106zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

206zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.56zC嘉泰姆

56zC嘉泰姆

2506zC嘉泰姆

CXSD62113|C6zC嘉泰姆

TQFN3x3-206zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

156zC嘉泰姆

66zC嘉泰姆

256zC嘉泰姆

26zC嘉泰姆

N6zC嘉泰姆

5506zC嘉泰姆

CXSD62113E6zC嘉泰姆

TQFN 3x3 206zC嘉泰姆

COT6zC嘉泰姆

26zC嘉泰姆

26zC嘉泰姆

116zC嘉泰姆

66zC嘉泰姆

256zC嘉泰姆

26zC嘉泰姆

N6zC嘉泰姆

5506zC嘉泰姆

CXSD621146zC嘉泰姆

TQFN3x3-206zC嘉泰姆

COT6zC嘉泰姆

26zC嘉泰姆

26zC嘉泰姆

116zC嘉泰姆

5.56zC嘉泰姆

256zC嘉泰姆

26zC嘉泰姆

N6zC嘉泰姆

2806zC嘉泰姆

CXSD621156zC嘉泰姆

QFN4x4-246zC嘉泰姆

VM6zC嘉泰姆

26zC嘉泰姆

16zC嘉泰姆

606zC嘉泰姆

3.16zC嘉泰姆

13.26zC嘉泰姆

0.856zC嘉泰姆

126zC嘉泰姆

50006zC嘉泰姆

CXSD62116A|B|C6zC嘉泰姆

SOP-8P6zC嘉泰姆

VM6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

206zC嘉泰姆

2.96zC嘉泰姆

13.26zC嘉泰姆

0.86zC嘉泰姆

126zC嘉泰姆

160006zC嘉泰姆

CXSD621176zC嘉泰姆

SOP-206zC嘉泰姆

VM6zC嘉泰姆

26zC嘉泰姆

26zC嘉泰姆

306zC嘉泰姆

106zC嘉泰姆

13.26zC嘉泰姆

16zC嘉泰姆

126zC嘉泰姆

50006zC嘉泰姆

CXSD621186zC嘉泰姆

TDFN3x3-106zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

16zC嘉泰姆

256zC嘉泰姆

1.86zC嘉泰姆

286zC嘉泰姆

0.76zC嘉泰姆

56zC嘉泰姆

2506zC嘉泰姆

CXSD621196zC嘉泰姆

TQFN3x3-206zC嘉泰姆

COT6zC嘉泰姆

26zC嘉泰姆

16zC嘉泰姆

406zC嘉泰姆

1.86zC嘉泰姆

256zC嘉泰姆

REFIN Setting6zC嘉泰姆

56zC嘉泰姆

7006zC嘉泰姆

CXSD621206zC嘉泰姆

QFN 3x3 206zC嘉泰姆

TQFN 3x3 166zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

206zC嘉泰姆

36zC嘉泰姆

286zC嘉泰姆

1.8|1.5 1.35|1.2 0.56zC嘉泰姆

56zC嘉泰姆

8006zC嘉泰姆

CXSD62121A6zC嘉泰姆

TQFN3x3 206zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

156zC嘉泰姆

36zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

2206zC嘉泰姆

CXSD62121B6zC嘉泰姆

TQFN3x3 206zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

156zC嘉泰姆

36zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

2206zC嘉泰姆

CXSD621216zC嘉泰姆

TQFN3x3-206zC嘉泰姆

COT6zC嘉泰姆

16zC嘉泰姆

26zC嘉泰姆

206zC嘉泰姆

36zC嘉泰姆

286zC嘉泰姆

0.756zC嘉泰姆

56zC嘉泰姆

1806zC嘉泰姆

 6zC嘉泰姆

 6zC嘉泰姆

 6zC嘉泰姆

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