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参数资料
| 型号： | IRDCIP1202-A |
| 厂商： | International Rectifier |
| 文件页数： | 18/29页 |
| 文件大小： | 0K |
| 描述： | BUCK CONV REF DESIGN KIT IP1202 |
| 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 |
| 功率 - 输出： | 60W |
| 输出电压： | 1.5V，2.5V |
| 电流 - 输出： | 15A，15A |
| 输入电压： | 5.5 ~ 13.2 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： | iP1202 |
| 其它名称： | *IRDCIP1202-A |
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iP1202
The inductor L o is selected according to equation (9):
Type II
Vout1
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
TheiP1202feedbackcontrolisbasedonsingleloop
voltage mode control principle if both outputs are
configured in dual output independent mode. In this
case, both outputs can have identical compensation.
If iP1202 outputs are configured for parallel opera-
tion, 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 iP1202 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 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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