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| 型号： | IP1837TRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/40页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 35A 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： | 250kHz ~ 1.5MHz |
| 电流 - 输出： | 35A |
| 同步整流器： | 是 |
| 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） |
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Highly ? Integrated ? 35A Single ‐ input ? Voltage, ??
Synchronous ? Buck ? Regulator ?
iP1837
An ? overcurrent ? detection ? trips ? the ? OCP ? comparator, ?
latches ? OCP ? signal ? and ? cycles ? the ? soft ? start ? function ? in ?
hiccup ? mode. ? The ? hiccup ? is ? performed ? by ? shorting ? the ??
soft ‐ start ? capacitor ? to ? ground ? and ? counting ? the ? number ? of ?
switching ? cycles. ? The ? Soft ? Start ? pin ? is ? held ? low ? until ? 4096 ?
cycles ? have ? been ? completed. ??
Following ? this, ? the ? OCP ? signal ? resets ? and ? the ? converter ?
recovers. ? After ? every ? soft ? start ? cycle, ? the ? converter ? stays ? in ?
this ? mode ? until ? the ? overload ? or ? short ? circuit ? is ? removed. ??
For ? the ? iP1837, ? the ? Sync ? FET ? is ? turned ? OFF ? on ? the ? falling ?
edge ? of ? a ? PWMSet ? or ? Clock ? signal ? that ? has ? a ? duration ? of ?
25% ? of ? the ? switching ? period. ??
For ? operation ? at ? the ? maximum ? duty ? cycle, ? the ? OCP ? circuit ?
samples ? current ? for ? 40 ? ns, ? starting ? 40 ? ns ? after ? the ? low ? drive ?
signal ? for ? the ? Sync ? FET ? > ? 70% ? of ? PVcc. ?
T ABLE ? 2: ? O VERCURRENT ? SETTING ? VS . ? E XTERNAL ? R OCSET ? ?
Thus, ? for ? low ? duty ? cycle ? operation, ? the ? inductor ? current ? is ?
sensed ? close ? to ? the ? valley. ? This ? allows ? a ? longer ? delay ? after ?
the ? falling ? edge ? of ? the ? switch ? node, ? than ? the ? corresponding ?
delay ? for ? an ? over ‐ current ? sensing ? scheme ? which ? samples ?
the ? current ? at ? the ? peak ? of ? the ? inductor ? current. ? This ? longer ?
delay ? serves ? to ? filter ? out ? any ? noise ? on ? the ? switch ? node ? and ?
hence ? on ? the ? OCSet ? pin, ? making ? this ? method ? more ?
immune ? to ? false ? tripping. ?
THERMAL ? SHUTDOWN ??
Temperature ? sensing ? is ? provided ? inside ? iP1837. ??
The ? trip ? threshold ? is ? typically ? set ? to ? 145 o C. ? When ? the ??
trip ? threshold ? is ? exceeded, ? thermal ? shutdown ? turns ??
off ? both ? MOSFETs ? and ? discharges ? the ? soft ? start ? capacitor. ?
Automatic ? restart ? is ? initiated ? when ? the ? sensed ?
temperature ? drops ? within ? the ? operating ? range. ? There ??
is ? a ? 20 o C ? hysteresis ? in ? the ? thermal ? shutdown ? threshold. ?
TRIMMABLE ? RISING ? EDGE ? DEADBAND ??
?
I otrip ? (A) ?
25 ?
26 ?
27 ?
28 ?
29 ?
30 ?
31 ?
32 ?
33 ?
34 ?
35 ?
36 ?
37 ?
38 ?
39 ?
40 ?
41 ?
42 ?
External?Rocset?(kohm)?
4.02 ?
4.42 ?
4.87 ?
5.4 ?
6.04 ?
6.8 ?
7.68 ?
8.66 ?
10 ?
11.5 ?
13.7 ?
16.2 ?
20 ?
26.1 ?
35.7 ?
54.9 ?
113 ?
Open ?
The ? iP1837 ? has ? a ? rising ? edge ? deadband ? that ? is ? post ‐
package ? trimmable. ? It ? is ? typically ? trimmed ? to ? 5ns ‐ 10ns ?
which ? is ? an ? optimal ? range ? to ? minimize ? switching ? transition ?
loss ? and ? at ? the ? same ? time, ? prevent ? cross ? conduction. ?
REMOTE ? VOLTAGE ? SENSING ?
True ? differential ? remote ? sensing ? in ? the ? feedback ? loop ? is ?
critical ? to ? high ? current ? applications ? where ? the ? output ?
voltage ? across ? the ? load ? may ? differ ? from ? the ? output ? voltage ?
measured ? locally ? across ? an ? output ? capacitor ? at ? the ? output ?
inductor, ? and ? to ? applications ? that ? require ? die ? voltage ?
sensing. ??
The ? Vosp ? and ? Vosm ? pins ? of ? the ? iP1837 ? form ? the ? inputs ? to ??
a ? remote ? sense ? differential ? amplifier ? with ? high ? speed, ? low ?
input ? offset ? (post ‐ package ? trimmed ? to ? +/ ‐ 3mV) ? and ? low ?
input ? bias ? current ? which ? ensure ? accurate ? voltage ? sensing ?
and ? fast ? transient ? response ? in ? such ? applications. ?
It ? should ? be ? noted, ? however, ? that ? the ? output ? Voso ? of ? the ?
difference ? amplifier ? also ? forms ? the ? input ? toa ? power ? good ?
comparator ? and ? overvoltage ? comparator, ? both ? referenced ?
to ? an ? upper ? threshold ? of ? 0.7V ? as ? discussed ? in ? the ? next ?
section. ? Hence, ? in ? applications ? where ? Vo ? > ? 0.6V, ? it ? is ?
necessary ? to ? use ? a ? resistive ? divider ? network ? after ? Vo ? to ?
attenuate ? the ? sensed ? output ? voltage ? signal ? between ? the ?
For ? operating ? duty ? cycles ? less ? than ? the ? maximum ? duty ?
cycle ? of ? 75%, ? the ? OCP ? circuit ? still ? samples ? current ? for ?
typically ? 40ns, ? but ? starts ? sampling ? 40 ? ns ? after ? the ? rising ?
edge ? of ? PWMSet ? . ??
remote ? Vo ? and ? the ? remote ? ground ? to ? 0.6V, ? which ? is ? then ?
applied ? between ? Vosp ? and ? Vosm. ?
17
March ? 5, ? 2012 ?? | ?? V1.26 ???
97600
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