参数资料
型号: IP1827TRPBF
厂商: International Rectifier
文件页数: 22/39页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 25A LGA
标准包装: 2,000
系列: iPOWIR™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 12 V
输入电压: 1.5 V ~ 16 V
PWM 型: 电压模式
频率 - 开关: 225kHz ~ 1.65MHz
电流 - 输出: 25A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 17-LLGA
包装: 带卷 (TR)
供应商设备封装: 17-LGA(7.65x7.65)
Highly ? Integrated ? 25A Single ‐ input ? Voltage, ?
Synchronous ? Buck ? Regulator ?
iP1827
Z IN
V OSO
R 8
R 3
C POLE
C 4
Z f
Where: ?
V in ? = ? Maximum ? Input ? Voltage ?
F o ? = ? Crossover ? Frequency ?
F ESR ? = ? Zero ? Frequency ? of ? the ? Output ? Capacitor ?
F LC ? = ? Resonant ? Frequency ? of ? the ? Output ? Filter ?
R 8 ? = ? Feedback ? Resistor ?
R 9
Fb
E/A
Comp
Ve
β? = ??? V ref /V o ?
F m =Modulator ? gain ??
To ? cancel ? one ? of ? the ? LC ? filter ? poles, ? place ? the ? zero ? before ?
Gain(dB)
V REF
the ? LC ? filter ? resonant ? frequency ? pole: ?
F z ? 0 . 75 *
H(s) dB
F z ? 75 % F LC
1
2 ? L o * C o
(22)
?
F
F Z
POLE
Frequency
?
Use ? equations ? (20), ? (21) ? and ? (22) ? to ? calculate ? C 4 . ?
Figure ? 18: ? Type ? II ? compensation ? network ??
and ? its ? asymptotic ? gain ? plot ?
The ? transfer ? function ? ( V e /V oso ) ? is ? given ? by: ?
One ? more ? capacitor ? is ? sometimes ? added ? in ? parallel ? with ? C 4 ?
and ? R 3 . ? This ? introduces ? one ? more ? pole ? which ? is ? mainly ? used ?
to ? suppress ? the ? switching ? noise. ?
V e Z f 1 ? sR 3 C 4
F P ?
2 ? * R 3 *
? H ( s ) ? ? ? ? (18) ?
V oso Z IN sR 8 C 4
The ? (s) ? indicates ? that ? the ? transfer ? function ? varies ? as ? a ?
function ? of ? frequency. ? This ? configuration ? introduces ? a ? gain ?
The ? additional ? pole ? is ? given ? by: ?
1
C 4 * C POLE
C 4 ? C POLE
(23) ?
and ? zero, ? expressed ? by: ?
The ? pole ? sets ? to ? one ? half ? of ? the ? switching ? frequency ? which ?
H ? s ? ?
F z ?
?
? *R 3 *F s ?
R 3
R 8
1
2 ? * R 3 * C 4
(19)
(20)
?
C POLE ?
results ? in ? the ? capacitor ? C POLE: ?
1 1
1 ? *R 3 *F s
C 4
(24) ?
First ? select ? the ? desired ? zero ‐ crossover ? frequency ? ( F o ): ?
F o ? F ESR and F o ? ? 1/5 ~ 1/10 ? * F s ?
Use ? the ? following ? equation ? to ? calculate ? R 3 : ?
For ? a ? general ? solution ? for ? unconditional ? stability ? for ? any ?
type ? of ? output ? capacitors, ? and ? a ? wide ? range ? of ? ESR ? values, ?
we ? should ? implement ? local ? feedback ? with ? a ? type ? III ?
compensation ? network. ? The ? typically ? used ? compensation ?
network ? for ? voltage ‐ mode ? controller ? is ? shown ? in ? Figure ? 19. ?
V e Z f
R 3 ?
F o * F ESR * R 8
V in * F m * ? * F LC 2
(21) ?
Again, ? the ? transfer ? function ? is ? given ? by: ?
? H ( s ) ? ?
V oso Z IN
?
22
March ? 5, ? 2012 ??? | ??? V1.4 ?
97599
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