參數(shù)資料
型號(hào)： PM6685TR
廠商： STMICROELECTRONICS
元件分類(lèi)： 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)： 35/52頁(yè)
文件大?。?/td> 2536K
代理商： PM6685TR
Monitoring and protections
PM6685
40/52
Where VRIPPLEout is the output ripple and q is the attenuation factor of the output ripple.
If the ripple is very small (lower than approximately 30mV), a further compensation network,
named virtual ESR network, is needed. This additional part generates a triangular ripple
that is added to the ESR output voltage ripple at the input of the integrator network. The
complete control schematic is represented in Figure 37.
Figure 37. Virtual ESR network
The T node voltage is the sum of the output voltage and the triangular waveform generated
by the virtual ESR network. In fact the virtual ESR network behaves like a further equivalent
ESR RESR.
A good trade-off is to design the network in order to achieve an RESR given by:
Equation 26
where
IL is the inductor current ripple and VRIPPLE is the overall ripple of the T node
voltage. It should be chosen higher than approximately 30mV.
The stability of the system depends firstly on the output capacitor value and on RTOT:
+
-
V
Vrr
C
CO
OM
MP
P
g
gm
m
O
OU
UT
T
R
RF
Fb
b1
1
R
RF
Fb
b2
2
V
Vrr
+
P
PW
WM
M
C
Co
om
mp
pa
arra
atto
orr
C
CIINNTT
R
RIINNTT
C
CFFIILLTT
t
Vr
C
COOUUTT
COMP PIN
VOLTAGE
L
D
OUTPUT
VOLTAGE
I=gm(V1-Vr)
V
V1
1
C
R
R1
1
R
t
T
T NODE
VOLTAGE
V
V1
R
ROOUUTT
V1
out
L
RIPPLE
ESR
R
I
V
R
=
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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(kāi)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(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
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(lèi)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(lèi)型:Crimp
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