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| 型号： | IP1827TRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/39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： | 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 ? 25A Single ‐ input ? Voltage, ?
Synchronous ? Buck ? Regulator ?
iP1827
THEORY ? OF ? OPERATION ?
?
INTRODUCTION ?
The ? iP1827 ? uses ? a ? PWM ? voltage ? mode ? control ? scheme ? with ?
external ? compensation ? to ? provide ? good ? noise ? immunity ?
and ? maximum ? flexibility ? in ? selecting ? inductor ? values ? and ?
capacitor ? types. ??
The ? switching ? frequency ? is ? programmable ? from ? 250kHz ??
to ? 1.5MHz ? and ? provides ? the ? capability ? of ? optimizing ? the ?
design ? in ? terms ? of ? size ? and ? performance. ??
iP1827 ? provides ? precisely ? regulated ? output ? voltage ?
programmed ? from ? 0.6V ? to ? 0.75*Vin ? using ? two ? external ?
resistors. ? The ? iP1827 ? is ? capable ? of ? operating ? with ? either ??
a ? 3.3V ? Vcc ? bias ? voltage ? (3.13V ? to ? 3.46V) ? or ? a ? PVcc ? bias ?
voltage ? from ? 4.5V ? to ? 7.5V, ? allowing ? an ? extended ? operating ?
input ? voltage ? range ? from ? 1.5V ? to ? 16V. ??
The ? device ? utilizes ? the ? on ‐ resistance ? of ? the ? low ? side ?
MOSFET ? as ? the ? current ? sense ? element; ? this ? method ?
enhances ? the ? converter’s ? efficiency ? and ? reduces ? cost ? by ?
eliminating ? the ? need ? for ? external ? current ? sense ? resistor. ??
iP1827 ? includes ? two ? low ? R ds(on) ? MOSFETs ? using ? IR’s ? HEXFET ?
technology. ? These ? are ? specifically ? designed ? for ? high ?
efficiency ? applications. ???
BIASING ? THE ? IP1827 ?
The ? iP1827 ? offers ? flexibility ? in ? choosing ? the ? bias ? supply ?
voltage ? as ? it ? is ? capable ? of ? operating ? with ? a ? 5V ? bias ? voltage ?
as ? well ? as ? a ? 3.3V ? bias ? voltage ? (Figure ? 1 ? and ? Figure ? 32) ? If ? it ? is ?
preferred ? to ? use ? a ? 5V ? bias ? voltage, ? this ? should ? be ? applied ?
between ? the ? PVcc ? pin ? and ? the ? local ? bias ? PGnd ? (pin ? 12), ?
with ? the ? Vcc ? pin ? tied ? to ? the ? local ? bias ? PGnd ? also. ?
6.5
6.45
6.4
6.35
Alternatively, ? if ? operation ? from ? 3.3V ? bias ? is ? desired, ? the ?
3.3V ? supply ? should ? be ? applied ? between ? Vcc ? and ? the ? local ?
bias ? PGnd. ? An ? internal ? charge ‐ pump ? whose ? output ? is ? tied ?
to ? PVcc, ? roughly ? doubles ? this ? Vcc ? voltage. ? This ? should ? be ?
preferred ? for ? high ? current ? applications ? which ? may ? benefit ?
from ? the ? lower ? Rds(on) ? on ? account ? of ? the ? higher ? PVcc ?
(almost ? 6.3V, ? from ? Figure ? 6), ? which ? forms ? the ? supply ? to ? the ?
gate ? drivers. ??
UNDER ‐ VOLTAGE ? LOCKOUT ? AND ? POR ?
The ? under ‐ voltage ? lockout ? circuit ? monitors ? the ? input ?
supply ? PVcc ? and ? the ? Enable ? input. ? It ? ensures ? that ? the ?
MOSFET ? driver ? outputs ? remain ? in ? the ? off ? state ? whenever ?
either ? of ? these ? two ? signals ? drop ? below ? the ? set ? thresholds. ?
Normal ? operation ? resumes ? once ? PVcc ? and ? Enable ? rise ?
above ? their ? thresholds. ?
The ? POR ? (Power ? On ? Ready) ? signal ? is ? generated ? when ? all ?
these ? signals ? reach ? the ? valid ? logic ? level ? (see ? system ? block ?
diagram). ? When ? the ? POR ? is ? asserted ? the ? soft ? start ?
sequence ? starts ? (see ? soft ? start ? section). ?
ENABLE ?
The ? Enable ? feature ? allows ? another ? level ? of ? flexibility ? for ?
start ? up. ? The ? Enable ? has ? precise ? threshold ? which ? is ?
internally ? monitored ? by ? Under ‐ Voltage ? Lockout ? (UVLO) ?
circuit. ? Therefore, ? the ? iP1827 ? will ? turn ? on ? only ? when ? the ?
voltage ? at ? the ? Enable ? pin ? exceeds ? this ? threshold, ? typically, ?
1.2V. ?
If ? the ? input ? to ? the ? Enable ? pin ? is ? derived ? from ? the ? bus ?
voltage ? by ? a ? suitably ? programmed ? resistive ? divider, ? it ? can ?
be ? ensured ? that ? the ? iP1827 ? does ? not ? turn ? on ? until ? the ? bus ?
voltage ? reaches ? the ? desired ? level. ? Only ? after ? the ? bus ?
voltage ? reaches ? or ? exceeds ? this ? level ? will ? the ? voltage ? at ?
Enable ? pin ? exceed ? its ? threshold, ? thus ? enabling ? the ? iP1827. ?
Therefore, ? in ? addition ? to ? being ? a ? logic ? input ? pin ? to ? enable ?
the ? iP1827, ? the ? Enable ? feature, ? with ? its ? precise ? threshold, ?
also ? allows ? the ? user ? to ? implement ? an ? Under ‐ Voltage ?
Lockout ? for ? the ? bus ? voltage ? V in . ? This ? is ? desirable ? particularly ?
for ? high ? output ? voltage ? applications, ? where ? we ? might ? want ?
the ? iP1827 ? to ? be ? disabled ? at ? least ? until ? V in ? exceeds ? the ?
desired ? output ? voltage ? level. ?
6.3
6.25
6.2
Figure ? 7a ? shows ? the ? startup ? sequence ? with ? the ? Enable ?
used ? to ? implement ? a ? precise ? under ‐ voltage ? lockout ? for ? V in . ??
Figure ? 7b. ? shows ? the ? recommended ? start ‐ up ? sequence ? for ?
6.15
200
300
400
500
600
700
800
900 1000 1100 1200 1300 1400 1500
iP1827, ? when ? Enable ? is ? used ? as ? a ? logic ? input.
Fsw (kHz)
?
Figure ? 6: ? PVcc ? v/s ? Switching ? Frequency ? (Fsw) ? with ? Vcc=3.3V ?
13
March ? 5, ? 2012 ??? | ??? V1.4 ?
97599
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IP1827TRPBF-CUT TAPE | 制造商:IR 功能描述:IP1827 Series Integrated 25 A Single-input Voltage Synchronous Buck Regulator |
| IP1837 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Highly Integrated 35A Singlea??input Voltage, Synchronous Buck Regulator |
| IP1837PBF | 功能描述:电源管理IC开发工具 35A 1.5V to 16V REG iPOWIR 1.5MHz RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IP1837TRPBF | 功能描述:开关变换器、稳压器与控制器 35A iPOWIR 1.5MHz Pvin 1.5V to 16V REG RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IP1842 | 制造商:SEME-LAB 制造商全称:Seme LAB 功能描述:CURRENT MODE REGULATING PULSE WIDTH MODULATORS |
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