参数资料
型号: PC34704BEP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 电源管理
英文描述: 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC56
封装: 7 X 7 MM, 1 MM HEIGHT, 0.40 MM PITCH, ROHS COMPLIANT, QFN-56
文件页数: 32/50页
文件大小: 2010K
代理商: PC34704BEP
Analog Integrated Circuit Device Data
38
Freescale Semiconductor
34704
FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
1. Output LC filter cutoff frequency (FLC):
2. Cutoff frequency due to capacitor ESR:
3. Crossover frequency (or bandwidth):
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.
OUT
LC
F
π
2
1
=
[Hz]
ESR
C
F
OUT
ESR
)
(
2
1
π
=
[Hz]
10
Fsw
F
BW =
[Hz]
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
0
min
R
F
V
Vin
C
P
RAMP
π
()
=
1
2
1
2
2 R
F
C
Z
π
()
=
2
1
3
1C
F
R
P
π
()
=
1
2
1
2
1C
F
R
Z
π
()
=
2
1
3
2 R
F
C
P
π
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