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參數資料
| 型號： | PM6670ASTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件頁數： | 17/53頁 |
| 文件大?。?/td> | 745K |
| 代理商： | PM6670ASTR |
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Device description
PM6670AS
24/53
Doc ID 14436 Rev 2
Figure 29.
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 with 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 60mV in order to enhance the recovering
capability. In 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 20mV, 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 determines 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
ΔV
V
VC
CINT
INT
ESR
C
2
k
f
k
f
out
Zout
SW
π
=
>
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| PM6670S | 功能描述:DC/DC 開關控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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| PM6670TR | 功能描述:直流/直流開關調節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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