- 您现在的位置：买卖IC网 > PDF目录13785 > IP1827TRPBF (International Rectifier)IC REG BUCK SYNC ADJ 25A LGA PDF资料下载
参数资料
| 型号： | IP1827TRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/39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） |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页
Highly ? Integrated ? 25A Single ‐ input ? Voltage, ?
Synchronous ? Buck ? Regulator ?
iP1827
OUTPUT ? CAPACITOR ? SELECTION ?
The ? voltage ? ripple ? and ? transient ? requirements ? determine ?
the ? output ? capacitors ? type ? and ? values. ? The ? criteria ? are ?
normally ? based ? on ? the ? value ? of ? the ? Effective ? Series ?
The ? output ? LC ? filter ? introduces ? a ? double ? pole, ?‐ 40dB/ ?
decade ? gain ? slope ? above ? its ? corner ? resonant ? frequency, ?
and ? a ? total ? phase ? lag ? of ? 180 o ? (see ? Figure ? 16). ? The ? resonant ?
frequency ? of ? the ? LC ? filter ? is ? expressed ? as ? follows: ?
Resistance ? (ESR). ? However ? the ? actual ? capacitance ? value ?
and ? the ? Equivalent ? Series ? Inductance ? (ESL) ? are ? other ?
contributing ? components. ? These ? components ? can ? be ?
F LC ?
1
2 ? ? L o ? C o
(16) ?
described ? as: ?
? V o ? ? V o ( ESR ) ? ? V o ( ESL ) ? ? V o ( C )
Figure ? 17 ? shows ? gain ? and ? phase ? of ? the ? LC ? filter. ? Since ? we ?
already ? have ? 180 o ? phase ? shift ? from ? the ? output ? filter ? alone, ?
the ? system ? runs ? the ? risk ? of ? being ? unstable. ?
? V o ( ESL ) ? ? in
? V ? V o ?
? V o ( ESR ) ? ? I L * ESR
? * ESL
? L ?
Gain
0dB
Phase
°
0dB
? V o ( C )
?
? I L
8 * C o * F s
(15)
?
-40dB/decade
-90 °
Δ V 0 = Output Voltage Ripple
Δ I L = Inductor Ripple Current
F LC
Frequency
-180 °
F LC
Frequency ?
?
Since ? the ? output ? capacitor ? has ? a ? major ? role ? in ? the ? overall ?
performance ? of ? the ? converter ? and ? determines ? the ? result ? of ?
transient ? response, ? selection ? of ? the ? capacitor ? is ? critical. ?
The ? iP1827 ? can ? perform ? well ? with ? all ? types ? of ? capacitors. ?
As ? a ? rule, ? the ? capacitor ? must ? have ? low ? enough ? ESR ? to ? meet ?
output ? ripple ? and ? load ? transient ? requirements. ?
The ? goal ? for ? this ? design ? is ? to ? meet ? the ? voltage ? ripple ?
requirement ? in ? the ? smallest ? possible ? capacitor ? size. ?
Therefore ? it ? is ? advisable ? to ? select ? ceramic ? capacitors ? due ??
to ? their ? low ? ESR ? and ? ESL ? and ? small ? size. ? Fifteen ? of ? the ?
Panasonic ? ECJ ‐ 2FB0J226ML ? (22uF, ? 6.3V, ? 3mOhm) ?
capacitors ? are ? a ? good ? choice. ?
FEEDBACK ? COMPENSATION ?
The ? iP1827 ? is ? a ? voltage ? mode ? controller. ? The ? control ? loop ? is ?
? Figure ? 17: ? Gain ? and ? Phase ? of ? LC ? filter ?
The ? iP1827 ? uses ? a ? voltage ‐ type ? error ? amplifier ? with ??
high ‐ gain ? (110dB) ? and ? wide ‐ bandwidth. ? The ? output ? of ??
the ? amplifier ? is ? available ? for ? DC ? gain ? control ? and ? AC ? phase ?
compensation. ?
The ? error ? amplifier ? can ? be ? compensated ? either ? in ? type ? II ??
or ? type ? III ? compensation. ??
Local ? feedback ? with ? Type ? II ? compensation ? is ? shown ? in ?
Figure ? 18. ??
This ? method ? requires ? that ? the ? output ? capacitor ? should ?
have ? enough ? ESR ? to ? satisfy ? stability ? requirements. ??
In ? general ? the ? output ? capacitor’s ? ESR ? generates ? a ? zero ?
typically ? at ? 5kHz ? to ? 50kHz ? which ? is ? essential ? for ? an ?
acceptable ? phase ? margin. ?
The ? ESR ? zero ? of ? the ? output ? capacitor ? is ? expressed ? as ?
follows: ?
a ? single ? voltage ? feedback ? path ? including ? error ? amplifier ?
and ? error ? comparator. ? To ? achieve ? fast ? transient ? response ?
and ? accurate ? output ? regulation, ? a ? compensation ? circuit ? is ?
F ESR ?
1
2 ? ? *ESR*C o
(17) ?
necessary. ? The ? goal ? of ? the ? compensation ? network ? is ? to ?
provide ? an ? open ‐ loop ? transfer ? function ? with ? the ? highest ??
0 ? dB ? crossing ? frequency ? and ? adequate ? phase ? margin ?
(greater ? than ? 45 o ). ?
?
21
March ? 5, ? 2012 ??? | ??? V1.4 ?
97599
相关PDF资料 |
PDF描述 |
|---|---|
| SCRH4D28-2R7 | INDUCTOR SMD 2.7UH 1.60A 100KHZ |
| ACC06DRAI-S734 | CONN EDGECARD 12POS .100 R/A PCB |
| MAX6723AUTYDD3+T | IC SUPERVISOR MPU SOT23-6 |
| SCRH4D28-270 | INDUCTOR SMD 27UH 0.58A 100KHZ |
| RCC44DRYS | CONN EDGECARD 88POS DIP .100 SLD |
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 |
发布紧急采购，3分钟左右您将得到回复。