参数资料
型号: IP1827TRPBF
厂商: International Rectifier
文件页数: 19/39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
DESIGN ? PROCEDURE ??
APPLICATION ? INFORMATION ?
Design ? Example ?
The ? following ? example ? is ? a ? typical ? application ? for ? iP1827. ?
The ? application ? circuit ? is ? shown ? on ? page ? 1. ?
V in ? = ? 12V ? (13.2V ? max) ?
V o ? = ? 1.8V ?
I o ? = ? 25A ?
Δ V o ? (transient) ?≤? ±90mV ? for ?Δ Io ? = ? 10.5A ? @ ? 2.5A/μs ?
Δ V o ? (ripple) ?≤? ±13.5mV ? (±0.75%) ?
F s ? = ? 600kHz ?
ENABLING ? THE ? IP1827 ?
As ? explained ? earlier, ? the ? precise ? threshold ? of ? the ? Enable ?
lends ? itself ? well ? to ? implementation ? of ? a ? UVLO ? for ? the ??
OUTPUT ? VOLTAGE ? PROGRAMMING ?
Output ? voltage ? is ? programmed ? by ? the ? reference ? voltage ?
and ? external ? voltage ? divider. ? If ? the ? remote ? sense ? feature ? is ?
used, ? the ? divider ? is ? connected ? to ? the ? Vosp ? and ? Vosm ? pins. ?
If ? only ? local ? sensing ? is ? used ? for ? feedback, ? with ? the ? remote ?
sense ? amplifier ? used ? only ? in ? the ? over ‐ voltage ? protection, ?
circuit, ? the ? resistive ? divider ? should ? be ? connected ? to ? the ??
Fb ? pin. ?
For ? this ? design, ? with ? high ? output ? current ? requirements, ? we ?
choose ? to ? use ? the ? true ? differential ? remote ? sense ? feature. ?
The ? Fb ? pin ? is ? the ? inverting ? input ? of ? the ? error ? amplifier, ?
which ? is ? internally ? referenced ? to ? 0.6V. ? This ? references ? the ?
output ? of ? the ? remote ? sense ? amplifier ? to ? 0.6V ? also. ? In ? order ?
to ? satisfy ? this ? condition, ? the ? voltage ? between ? the ? Vosp ? and ?
Vosm ? pins ? of ? the ? error ? amplifier ? should ? be ? 0.6V ? when ? the ?
output ? is ? at ? its ? desired ? value. ? The ? output ? voltage ? is ? defined ?
by ? using ? the ? following ? equation: ?
V o ? V ref ? ? ? 1 ?
?
?
Bus ? Voltage. ?
iP1827
Enable
Vin
R 1
? R top ?
(8) ?
? R bot ?
when ? an ? external ? resistor ? divider ? is ? connected ? to ? the ?
R 2
?
output ? as ? shown ? in ? Figure ? 16. ?
Equation ? (8) ? can ? be ? rewritten ? as: ?
? V EN ? 1.2
R 2
R 1 ? R 2
R 2 ? R 1
R top ? R bot ? ?
? V
?
?
For ? a ? typical ? Enable ? threshold ? of ? V EN ? = ? 1.2 ? V ?
V in (min) *
V EN
V in( min ) ? V EN
(6)
(7) ?
?
? V o ? V ref
? ref
iP1827
Vosp
?
?
(9) ?
V OUT
R top
For ? a ? V in ? (min) ? = ? 10.2V, ? R 1 ? = ? 49.9K ? and ? R 2 ? = ? 7.5K ? is ? a ? good ?
choice. ?
Vosm
R comp
R bot
?
PROGRAMMING ? THE ? FREQUENCY ?
For ? F s ? = ? 600 ? kHz, ? select ? R t ? = ? 36.5 ? k Ω , ? using ? Table ? 1. ?
Figure ? 16: ? Typical ? application ? of ? the ? iP1827 ??
for ? programming ? the ? output ? voltage ?
19
March ? 5, ? 2012 ??? | ??? V1.4 ?
97599
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