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参数资料
| 型号： | IRDCIP1201-A |
| 厂商： | International Rectifier |
| 文件页数： | 19/29页 |
| 文件大小： | 0K |
| 描述： | BUCK CONV REF DESIGN KIT IP1201 |
| 标准包装： | 1 |
| 系列： | iPOWIR™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 1.5V，2.5V |
| 电流 - 输出： | 15A，15A |
| 输入电压： | 3.14 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | iP1201 |
| 相关产品： | IP1201TRPBF-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201PBF-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201TR-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201-ND - IC REG BUCK SYNC ADJ 30A 198BGA |
| 其它名称： | *IRDCIP1201-A |
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iP1201
FZ
R 7 1 + sR 5 C 9
H ( s ) = g m × × (9)
H ( s ) = g m ×
× R 5
R 7 + R 9
f z =
2 π × R 5 × C 9
tor value for the second output.
Control Loop Compensation
The iP1201 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 compensa-
tion. If iP1201 outputs are configured for parallel
operation, then compensation of the outputs will dif-
fer 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 (8):
f LC = 1 / (2 π L 0 × C 0 ) (8)
The error amplifiers of the iP1201 PWM controller
are transconductance amplifiers, and their outputs
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 6) of which is in the midfrequency range and
Type III that can be used for any type of output ca-
pacitors and have a wide range of f esr .
Magnitude(dB)
H(s) dB
Frequency
Fig. 20: Typical Type II compensation and its gain
plot
From Fig.19 the transfer function H(s) of the error
amplifier is given by (9):
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 (10) and (11):
R 7
(10)
where, g m is the transconductance of the error am-
plifier.
1
(11)
Follow the steps below to determine the feedback
loop compensation component values:
1. Select a zero db crossover frequency f 0 in the range
of 10% to 20% of the switching frequency f sw.
Type II
Vout1
2. Calculate R 5 using equation (12):
R 5 = V 1 ramp ×
f × f esr
R + R 9
R9
FB1
iP1201
. 25
1
V IN
× 0 2
f LC
× 7
R 7
×
1
g m
(12)
Ve
R7
C10
C9
R5
VREF
CC1
(Optional)
E/A1
Where,
V IN = Maximum Input voltage
f 0 = Error amplifier zero crossover frequency
f esr = Output capacitor C o zero frequency
f LC = Output frequency resonant filter
g m = Error amplifier transconductance. Use
2000 μ mho for g m .
V ramp = Oscillator ramp Voltage.
Use 1.25V for V ramp
www.irf.com
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