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参数资料
| 型号： | IRDCIP1202-A |
| 厂商： | International Rectifier |
| 文件页数： | 20/29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
(20)
=
f p 2
f p 3 ?
2 π × R 23 × C 18
f z 1 =
2 π × R 23 × C 9
put capacitor C o and determine the value of R 24 from
equation (20). Make sure R 24 <
R 7 = R 9 x V ref V
(25)
-
f z 2 =
2 π × R 9 × C 19
Thefrequenciesofthethreepolesandthetwozeros
of the type III compensation scheme are represented
by the following equations:
f p1 = 0 (19)
1
2 π × R 24 × C 19
1
(21)
1
(22)
1
(23)
The crossover frequency f 0 for type III compensation
is represented by equation (24):
7. Place the second pole f p2 at or near f esr of the out-
R 9
10
8. Use equation (25) to calculate R 7 .
V
o ref
More than one iteration may be required to calculate
the values of the compensation components if cross-
over frequencies higher than the range specified in
step 1 are required (for higher bandwidths and faster
transient response performance). To ensure stability
a phase margin greater than 45° should be achieved.
Refer to AN-1043 for more detailed compensation
techniques using Transconductance Amplifiers.
Compensation in Current Share Mode
The iP1202 can be configured in single output paral-
leled configuration. The feedback loop of the first out-
put is closed around the output voltage, and the sec-
ond amplifier, which is also a transconductance one,
forces equal sharing of the inductor currents in both
outputs.
f 0 = V 0 . 8 × V IN × R 23 × C 19 ×
1
ramp
1
2 π × L 0 × C 0
(24)
Voltage Loop
Select C18 such that C 18 <
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.
2. Select R 23 ~ 10k ?
3. Place the first zero f z1 at 75% of the resonant fre-
quency f LC of the output filter.
Determine C 9 from equation (22).
4. Place a third pole f P3 at or near the switching fre-
quency f SW .
C 9
10
5. Calculate C 19 from equation (24).
6. Place the second zero at 125% of the resonant
frequency f LC of the output filter. Calculate R 9 using
equation (23).
20
Type II and Type III methods of voltage loop com-
pensation discussed above, can be used to com-
pensate the voltage loop of a single output iP1202.
In this case, the total amount of capacitance seen
by both channels and the inductance of the voltage
controlling channel should be considered for com-
pensation.
Current Loop
Use the following procedure for current loop com-
pensation:
In Fig. 20, L 1 and L 2 are the inductors for outputs 1
and 2 respectively. Rsh1 and Rsh2 are the current
sensing shunts for the same outputs.
www.irf.com
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