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参数资料
| 型号： | PM6675STR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件页数： | 17/53页 |
| 文件大小： | 2632K |
| 代理商： | PM6675STR |
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Device description
PM6675S
24/53
Figure 35.
Circuitry for output ripple compensation
The additional capacitor is used to reduce the voltage on the COMP pin when higher than
300 mVpp and is unnecessary for most of applications. The trans conductance amplifier
(gm) generates a current, proportional to the DC error, used to charge the CINT capacitor.
The voltage across the CINT capacitor feeds the negative input of the PWM comparator,
forcing the loop to compensate the total static error. An internal voltage clamp forces the
COMP pin voltage range to ±150 mV respect to VREF. This is useful to avoid or smooth
output voltage overshoot during a load transient. When the Pulse-Skip Mode is entered, the
clamping range is automatically reduced to 60 mV in order to enhance the recovering
capability. If the ripple amplitude is larger than 150 mV, an additional capacitor CFILT can be
connected between the COMP pin and ground to reduce ripple amplitude, otherwise the
integrator will operate out of its linearity range. This capacitor is unnecessary for most of
applications and can be omitted.
The design of the external feedback network depends on the output voltage ripple. If the
ripple is higher than approximately 20 mV, the correct CINT capacitor is usually enough to
keep the loop stable. The stability of the system depends firstly on the output capacitor zero
frequency.
The following condition must be satisfied:
Equation 6
where k is a fixed design parameter (k > 3). It determinates the minimum integrator
capacitor value:
+
-
V
VREF
REF
COMP
g
gm
m
VSNS
R
RFb1
Fb1
R
RFb2
Fb2
Vr
+
PWM
Comparator
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP PIN
VOLTAGE
OUTPUT
VOLTAGE
I=gm(V1-Vr)
V
V11
t
V
V
VC
CINT
INT
ESR
C
2
k
f
k
f
out
Zout
SW
π
=
>
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相关代理商/技术参数 |
参数描述 |
|---|---|
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| PM6680 | 功能描述:DC/DC 开关控制器 No Rsense dual StepDwn Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| PM6680_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:No Rsense dual step-down controller with adjustable voltages for notebook system power |
| PM6680A | 功能描述:DC/DC 开关控制器 Dual sync controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| PM6680ATR | 功能描述:DC/DC 开关控制器 Dual sync controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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