參數(shù)資料
型號(hào)： PM6675
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, VFQFPN-24
文件頁(yè)數(shù)： 11/47頁(yè)
文件大?。?/td> 650K
代理商： PM6675
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
PM6675
Device description
19/47
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 determinates the minimum integrator
capacitor value:
Equation 7
where gm = 50
s is the integrator trans conductance.
If the ripple on the COMP pin is greater than the integrator 150mV, the auxiliary capacitor
CFILT can be added. If q is the desired attenuation factor of the output ripple, CFILT is given
by:
Equation 8
In order to reduce the noise on the COMP pin, it is possible to add a resistor RINT that,
together with CINT and CFILT, becomes a low pass filter. The cutoff frequency fCUT must be
much greater (10 or more times) than the switching frequency:
Equation 9
If the ripple is very small (lower than approximately 20mV), a different compensation
network, called "Virtual-ESR" Network, is needed. This additional circuit generates a
triangular ripple that is added to the output voltage ripple at the input of the integrator. The
complete control scheme is shown in Figure 8.
ESR
C
2
k
f
k
f
out
Zout
SW
π
=
>
Vout
Vr
f
k
f
2
g
C
Zout
SW
m
INT
π
>
q
)
q
1
(
C
INT
FILT
=
FILT
INT
FILT
INT
CUT
INT
C
f
2
1
R
+
π
=
相關(guān)PDF資料
PDF描述
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PM6675AS 功能描述:DC/DC 開(kāi)關(guān)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(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
PM6675ASTR 功能描述:低壓差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6675ATR 功能描述:低壓差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6675S 功能描述:DC/DC 開(kāi)關(guān)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(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
PM6675STR 功能描述:低壓差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
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