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参数资料
| 型号： | IRDCIP1203-A |
| 厂商： | International Rectifier |
| 文件页数： | 14/23页 |
| 文件大小： | 0K |
| 描述： | IP1203 REFERENCE DESIGN KIT |
| 标准包装： | 1 |
| 系列： | iPOWIR™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 15A |
| 输入电压： | 5.5 ~ 13.2 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 400kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | iP1203 |
| 相关产品： | IP1203TRPBF-ND - IC REG BUCK SYNC ADJ 15A 24LGA IP1203PBF-ND - IC REG BUCK SYNC ADJ 15A 24LGA IP1203TR-ND - IC REG BUCK SYNC ADJ 15A 24LGA IP1203-ND - IC REG BUCK SYNC ADJ 15A 24LGA |
| 其它名称： | *IRDCIP1203-A |
iP1203
Control Loop Compensation
The iP1203 feedback control is based on single loop
voltage mode control principle.
Vout
R2
iP1203
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 ° 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 (9):
f LC = 1 / (2 π L 0 × C 0 )
(9)
R5
C6
C9
R19
FB
V REF
CC
(Optional)
E/A1
The error amplifier of the iP1203 PWM controller is
transconductance amplifier, and its output is avail-
able for external compensation.
Two types of compensators are studied in this sec-
tion. The first one is called Type II and it is used to
compensate systems the ESR frequency f esr (equa-
tion 7) 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 .
Magnitude(dB)
H(s) dB
FZ
Frequency
H ( s ) = g m ×
× R 19
R 5
R 5 + R 2
H ( s ) = g m ×
R 5 1 + sR 19 C 9
R 5 + R 2
f z =
2 π × R 19 × C 9
For output voltage settings less than 1.0V that use
low ESR ceramic capacitors, it is recommended that
the unity gain crossover frequency be set around
20kHz to maintain stable operation.
Type II
From Fig.15 the transfer function H(s) of the error
amplifier is given by (10):
× (10)
sR 19 C 9
The term s represents the frequency dependence of
the transfer function.
The Type II controller introduces a gain and a zero
expressed by equations (11) and (12):
14
Fig. 15: Typical Type II Compensation and its Gain
Plot
(11)
where, g m is the transconductance of the error am-
plifier.
1
(12)
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.
www.irf.com
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