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參數(shù)資料
| 型號： | PC34704BEP |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC56 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, 0.40 MM PITCH, ROHS COMPLIANT, QFN-56 |
| 文件頁數(shù)： | 37/50頁 |
| 文件大?。?/td> | 2010K |
| 代理商： | PC34704BEP |
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Analog Integrated Circuit Device Data
42
Freescale Semiconductor
34704
FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
Now calculate the maximum allowed ESR to reach the
desired.
R1 and RB: These two resistors help to set the output
voltage to the desire value using a VFB7=0.6V, select R1
between 10k and 150K and then calculate RB as follows:
NOTE: RB is not grounded, instead is connected to
VREF7 pin (VREF7=1.5V) which provide a positive voltage to
assure a positive voltage at the FB7 pin.
Compensation network. (C1,C2,C3, R2, R3)
For compensating a buck converter, 4 important
frequencies referring to the plant are:
Output LC filter cutoff frequency (FLC):
Where D’min is the minimum off time percentage given by:
Cutoff frequency due to capacitor ESR:
The right plane zero frequency:
Crossover frequency (or bandwidth): select this
frequency as far away form the RHPZ as much as
possible:
The Type 3 external compensation network will be in
charge of canceling some of these poles and zeros to
achieve stability in the system. The following poles and
zeroes frequencies are provided by the type 3 compensation:
The passive components associated to these frequencies are calculated with the following formulas.
On the 34704 VRAMP is half of 1.2V since each operation mode spends only half the ramp.
[
]
+
≤
D
I
D
Io
Vo
ESR
OB
r
1
max
[
]
RB
0.9
1.5 Vo
–
0.9
–
------------------------------------------R1
=
[Hz]
OUT
LC
D
F
π
2
'
min
=
|
'
max
min
Vout
Vin
D
=
[Hz]
ESR
C
F
OUT
ESR
)
(
2
1
π
=
[Hz]
L
D
R
D
LOAD
π
2
*
)
'
(
RHP
2
min
Z =
[Hz]
6
Z
BW
RHP
F
<<
BW
P
F
=
0
LC
Z
F
9
.
0
1 =
LC
Z
F
1
.
1
2 =
ESR
P
F
=
1
2
Fsw
F
P
=
()
=
1
2
1
2
2 R
F
C
Z
π
()
=
1
2
1
2
1C
F
R
Z
π
()
=
2
1
3
2 R
F
C
P
π
()
=
1
2
1
'
1
0
2
min
R
F
D
V
Vin
C
P
RAMP
π
()
=
2
1
3
1C
F
R
P
π
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