参数资料
型号: IP1827TRPBF
厂商: International Rectifier
文件页数: 15/39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
POR
0.2V
0.8V
An ? internal ? current ? source ? sources ? current ? ( I OCSet ? ) ? out ? of ?
the ? OCSet ? pin. ? The ? internal ? current ? source ? develops ? a ?
voltage ? across ? ROCSet . ? When ? the ? low ? side ? MOSFET ? is ?
turned ? on, ? the ? inductor ? current ? flows ? through ? Q2 ? and ?
results ? in ? a ? voltage ? at ? OCSet ? which ? is ? given ? by: ?
Vss
V OCSet ? ( I OCSet ? R OCSet ) ? ( R DS (on ) ? I L )
(2)
Vout
t1
t2
t3
?
An ? over ? current ? is ? detected ? if ? the ? OCSet ? pin ? goes ? below ?
ground. ? Hence, ? at ? the ? current ? limit ? threshold, ? V OCset =0. ?
Then, ? for ? a ? current ? limit ? setting ? I Ltrip , ? R OCSet ? is ? calculated ? as ?
Figure ? 10: ? Theoretical ? operation ? waveforms ? during ? soft ‐ start ?
follows: ?
OPERATING ? FREQUENCY ??
The ? switching ? frequency ? can ? be ? programmed ? between ?
R OCSet ?
R DS ( on ) * I Ltrip
I OCSet
(3)
250kHz ? – ? 1500kHz ? by ? connecting ? an ? external ? resistor ? from ?
R T ? pin ? to ? Gnd. ? Table ? 1 ? tabulates ? the ? oscillator ? frequency ?
versus ? R T . ?
T ABLE ? 1: ? S WITCHING ? F REQUENCY ? VS . ? E XTERNAL ? R ESISTOR ? ( R T ) ?
Q1
?
?
?
Vin
SW
Fsw ? (kHz) ?
250 ?
R T ? (kohm) ?
88.7 ?
Q2
?
300 ?
400 ?
450 ?
500 ?
600 ?
73.2 ?
54.9 ?
48.7 ?
44.2 ?
36.5 ?
Hiccup
Control
IntV cc
?
?
?
I OCSet
?
PGnd
R OCSet
OCSet
800 ?
1000 ?
1500 ?
27.4 ?
22.1 ?
14 ?
?
Figure ? 11: ? Connection ? of ? over ‐ current ? sensing ? resistor ?
It ? should ? be ? noted ? that ? the ? iP1827 ? uses ? a ? temperature ?
SHUTDOWN ?
The ? iP1827 ? can ? be ? shutdown ? by ? pulling ? the ? Enable ? pin ?
below ? its ? 1 ? V ? threshold. ? This ? will ? tri ‐ state ? both, ? the ? high ?
side ? driver ? as ? well ? as ? the ? low ? side ? driver. ??
TEMPERATURE ‐ COMPENSATED ??
OVER ‐ CURRENT ? PROTECTION ?
The ? over ? current ? protection ? is ? performed ? by ? sensing ?
current ? through ? the ? R DS(on) ? of ? low ? side ? MOSFET. ? This ?
method ? enhances ? the ? converter’s ? efficiency ? and ? reduces ?
cost ? by ? eliminating ? a ? current ? sense ? resistor. ? As ? shown ? in ?
Figure ? 11, ? an ? external ? resistor ? (R OCSet ) ? is ? connected ?
between ? OCSet ? pin ? and ? the ? switch ? node ? (SW) ? which ? sets ?
the ? current ? limit ? set ? point. ??
compensated ? overcurrent ? protection ? scheme, ? i.e., ? I OCSet ?
varies ? with ? temperature ? with ? the ? same ? temperature ?
coeffecient ? as ? R DS(on) , ? so ? that ? I Ltrip ? depends ? only ? on ? Rocset ?
and ? is ? independent ? of ? temperature. ??
The ? value ? of ? Rocset ? calculated ? above ? is ? realized ? as ? a ?
parallel ? combination ? of ? an ? internal ? 2.7K ? resistor ? and ? an ?
external ? resistor ? connected ? between ? the ? Rocset ? and ? SW ?
pins. ? Table ? 2 ? shows ? the ? selection ? of ? the ? external ? Rocset ?
resistor ? for ? various ? values ? of ? the ? trip ? load ? current ? I otrip ?? at ??
Vcc ? = ? 3.3V. ? ?
15
March ? 5, ? 2012 ??? | ??? V1.4 ?
97599
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