參數(shù)資料
型號(hào)： PM6685TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁(yè)數(shù)： 33/52頁(yè)
文件大?。?/td> 2536K
代理商： PM6685TR
PM6685
Monitoring and protections
39/52
The stability of the system depends firstly on the output capacitor zero frequency. The
following condition should be satisfied:
Equation 21
where k is a design parameter greater than 3 and Rout is the ESR of the output capacitor. It
determinates the minimum integrator capacitor value CINT:
Equation 22
where gm=50us is the integrator transconductance.
In order to ensure stability it must be also verified that:
Equation 23
In order to reduce ground noise due to load transient on the other section, it is
recommended to add a resistor RINT and a capacitor Cfilt that, together with CINT, realize a
low pass filter (see Figure 36). The cutoff frequency fCUT must be much greater (10 or more
times) than the switching frequency of the section:
Equation 24
Due to the capacitive divider (CINT, Cfilt), the ripple voltage at the COMP pin is given by:
Equation 25
out
Zout
sw
R
C
2
k
f
k
f
×
π
=
×
>
OUT
Zout
sw
m
INT
V
Vr
f
k
f
2
g
C
×
×
π
>
OUT
Zout
m
INT
V
Vr
f
2
g
C
×
π
>
filt
INT
filt
INT
CUT
INT
C
f
2
1
R
+
×
π
=
q
V
C
V
RIPPLEout
filt
INT
RIPPLEout
RIPPLEINT
×
=
+
×
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6686 制造商:STMicroelectronics 功能描述:
PM6686TR 功能描述:DC/DC 開關(guān)控制器 Step-down Controller w/adj. voltages-dual RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
PM6-6F-L 功能描述:端子 Metric Fork Terminal non-insulated, 4.0 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
PM6-6R-D 制造商:Panduit Corp 功能描述:
PM6-6R-L 功能描述:端子 Metric Ring Terminal non-insulated, 2.5 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
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