参数资料
型号: IRDCIP1202-A
厂商: International Rectifier
文件页数: 19/29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:
已用 IC / 零件: iP1202
其它名称: *IRDCIP1202-A
iP1202
R 5 = V 1 ramp ×
1 f × f esr R + R 9 1
1 ( 1 + sR 23 C 9 ) × ( 1 + sR 9 C 19 )
( 1 + sR 23 C 18 ) × ( 1 + sR 24 C 19 )
2. Calculate R 5 using equation (14):
. 25 × 0 2 × 7 × (14)
V IN f LC R 7 g m
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 2mS for
g m .
V ramp = Oscillator ramp Voltage.
Use 1.25V for V ramp
3. Place a zero at 75% of f LC to cancel one of the LC
filter poles.
Type III
Type III compensation scheme allows the use of any
type of capacitors with esr frequency of any range.
This scheme suggests a double pole double zero
compensation and requires more components around
the error amplifier to achieve the desired gain and
phase margins. Fig. 19 represents the type III com-
pensation network for iP1202.
The transfer function of the type III compensator is
given by eqaution (18)
H ( s ) = × (18)
sR 9 C 9
C18
f z = 0 . 75 ×
2 π
1
L o × C o
(15)
Vout1
R23
C9
4. Calculate C 9 using equations (13) and (15)
C19
CC1
Calculation of compensation components for output1,
based on the example above yields:
R24
R9
iP1202
f LC = 5.0kHz
f z = 3.8kHz
f 0 = 45kHz
f esr = 14kHz, per equation (6) using R esr = 12m ? .
R 5 = 2.49K
C 9 = 18nF
R7
C10
FB1
VREF
E/A1
The same steps can be used to determine the val-
ues of the compensation components for output2.
Sometimes, a pole f p2 is added at half the switching
frequency to filter the switching noise. This is done
by adding a capacitor C opt in Fig.18 from the output of
the error amplifier (CC pin of iP1202) to ground. This
pole is given by equation (16):
Magnitude(dB)
H(s) dB
f p 2 ≈
1
2 π × R 5 × C opt
(16)
FZ1
FZ2
FP2
FP3
Frequency
C opt =
1
C opt is found from equation (17) by rearranging the
terms in equation (16) and by setting f p2 = f sw / 2:
(17)
2 π × f p 2 × R 5
www.irf.com
Fig. 19: Typical Type III compensation and its gain
plot
19
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