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参数资料
| 型号： | IP1202TRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/29页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 30A 198BGA |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 750 |
| 系列： | iPOWIR™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 5.5 V ~ 13.2 V |
| 频率 - 开关： | 200kHz ~ 400kHz |
| 电流 - 输出： | 30A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 198-BGA（161 凸块） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | BGA（15.5x9.25） |
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iP1202PbF
The inductor L o is selected according to equation (9):
Type II
Vout1
iP1202PbF
L O = V out x (1 - D) / (f sw x I ripple )
(9)
R9
iP1202
For output 1 of the above example, and for I ripple of
30% of I OUT1 , L O1 is calculated to be 1.0 μ H.
The core must be selected according to the peak of
maximum output current.
A similar calculation can be applied to find an induc-
tor value for the second output.
R7
C10
FB1
VREF
E/A1
CC1
Control Loop Compensation
C9
(Optional)
FZ
R 7 1 + sR 5 C 9
H ( s ) = g m × × (11)
H ( s ) = g m ×
× R 5
R 7 + R 9
The iP1202PbF feedback control is based on single
loop voltage mode control principle if both outputs
are configured in dual output independent mode. In
this case, both outputs can have identical compen-
sation. If iP1202PbF outputs are configured for par-
allel operation, then compensation of the outputs will
differ slightly.
The goal in the design of the compensator is to
achieve the highest unity gain (0 db) crossover fre-
quency with sufficient phase margin for the closed
loop transfer function. The LC filter of the power sup-
ply introduces a double pole with ?40db/dec slope
and 180 0 phase lag. The 180 ° phase contribution from
the LC filter is the source of instabilty.
The resonant frequency of the LC filter is expressed
by equation (10):
f LC = 1 / (2 π L 0 × C 0 ) (10)
The error amplifiers of the iP1202PbF PWM control-
ler are transconductance amplifiers, and their out-
puts are available for external compensation.
Two type of compensators are studied in this sec-
tion. The first one is called Type II and it is used to
compensate systems the e.s.r. frequency f esr (equa-
tion 8) of which is in the midfrequency range and Type
III that can be used for any type of output capacitors
and have a wide range of f esr .
R5
Magnitude(dB)
H(s) dB
Frequency
Fig. 18: Typical Type II compensation and its gain
plot
From Fig.18 the transfer function H(s) of the error
amplifier is given by (11):
R 7 + R 9 sC 9 R 5
The term s represents the frequency dependence of
the transfer function.
The Type II controller introduces a gain and a zero
expressed by equations (12) and (13):
R 7
(12)
where, g m is the transconductance of the error am-
plifier.
f z =
1
2 π × R 5 × C 9
(13)
Follow the steps below to determine the feedback
loop compensation component values:
18
1. Select a zero db crossover frequency f 0 in the range
of 10% to 20% of the switching frequency f sw.
www.irf.com
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