参数资料
型号: IP1827TRPBF
厂商: International Rectifier
文件页数: 24/39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
These ? result ? in: ?
F LC =26.53kHz ?
F ESR =4.4MHz ?
F s /2 =300kHz ?
Select ? crossover ? frequency ? F o =110 ? kHz ?
Since ? F LC <F o <F s /2<F ESR , ? Type ? III ? is ? selected ? to ? place ??
PROGRAMMING ? THE ? CURRENT ‐ LIMIT ?
The ? Current ‐ Limit ? threshold ? can ? be ? set ? by ? connecting ??
a ? resistor ? (R OCSet ) ? from ? the ? SW ? pin ? to ? the ? OCSet ? pin. ??
The ? resistor ? can ? be ? selected ? by ? using ? Table ? 2. ??
In ? order ? to ? set ? a ? trip ? current ? of ? 31A, ? we ? may ? select ??
R OCSet ? = ? 20.5K, ? using ? Table ? 2. ??
the ? pole ? and ? zeros. ?
SETTING ? THE ? POWER ? GOOD ? THRESHOLD ?
Detailed ? calculation ? of ? compensation ? Type ? III: ?
Desired ? Phase ? Margin ?Θ? = ? 80° ?
A ? window ? comparator ? internally ? sets ? a ? lower ? Power ? Good ?
threshold ? at ? 0.51V ? and ? an ? upper ? Power ? Good ? threshold ? at ?
0.7V. ? When ? the ? voltage ? at ? the ? Voso ? pin ? is ? within ? the ?
F Z 2 ? F o
F P 2 ? F o
1 ? sin ?
1 ? sin ?
1 ? sin ?
1 ? sin ?
? 9.62 kHz ?
? 1257.31 kHz ?
window ? set ? by ? these ? thresholds, ? PGood ? is ? asserted. ?
The ? power ? good ? output ? PGD ? is ? an ? open ? drain ? output. ?
Hence, ? it ? is ? necessary ? to ? use ? a ? pull ? up ? resistor ? R PG ? from ?
PGD ? pin ? to ? Vcc. ? The ? value ? of ? the ? pull ‐ up ? resistor ? must ? be ?
chosen ? such ? as ? to ? limit ? the ? current ? flowing ? into ? the ? PGD ?
F Z 1 ? 0.5 * F Z 2 ? 4.81 kHz ?
F P 3 ? 0.5 * F s ? 300 kHz ?
Select: ? C 7 ? = ? 2.2nF ?
Calculate: ? R 3 , ? C 3 ? and ? C 4 : ?
pin, ? when ? the ? output ? voltage ? is ? not ? in ? regulation, ? to ? less ?
than ? 5mA. ? A ? typical ? value ? used ? is ? 10k Ω . ?
It ? must ? be ? noted ? that ? if ? the ? voltage ? on ? Voso ? exceeds ? the ?
upper ? threshold ? 0.7V, ? not ? only ? is ? PGD ? de ‐ asserted, ? but ? also ?
an ? overvoltage ? fault ? is ? flagged, ? following ? which, ? even ? if ? the ?
overvoltage ? condition ? gets ? resolved, ? the ? converter ? can ? be ?
re ‐ started ? only ? by ? cycling ? Vcc ? or ? Enable. ??
R 3 ?
2 ? * F o * L o * C o
C 7 * V in * F m * ?
; R 3 ? 4.42 k ?
?
?
Select: ? R 3 ? = ? 4.22 ? k ??
C 4 ?
C 3 ?
1
2 ? * F Z 1 * R 3
1
2 ? * F P 3 * R 3
; C 4 ? 7.84 nF, Select : C 4 ? 8.2 nF ?
; C 3 ? 125.71 pF , Select : C 3 ? 120 pF ?
Calculate: ? R 10 , ? R 8 ? and ? R 9 : ?
R 10 ?
R 8 ?
1
2 ? * C 7 * F P 2
1
2 ? * C 7 * F Z 2
; R 10 ? 60 ? , Select : R 10 ? 57.6 ? ?
- R 10 ; R 8 ? 7.46 k ? , ?
Select: ? R 8 ? = ? 7.5 ? k ???
24
March ? 5, ? 2012 ??? | ??? V1.4 ?
97599
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