- 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： | 20/39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页当前第20页第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
For ? our ? design, ? R bot ? is ? selected ? to ? be ? 604 ? ohm. ??
This ? selection ? is ? based ? on ? a ? trade ‐ off ? between ? two ?
considerations: ??
1) ? The ? resistive ? divider ? should ? be ? as ? low ? impedance ? as ?
possible ? in ? order ? to ? have ? minimal ? impact ? on ? the ?
impedance ? seen ? at ? the ? Vosp ? and ? Vosm ? pins. ?
2) ? The ? resistive ? divider ? should ? have ? high ? enough ?
impedance ? so ? as ? to ? minimize ? the ? bleed ? current ? from ?
the ? output. ?
Hence, ? from ? Equation ? (9), ? R top ? = ? 1.21K. ?
In ? order ? to ? ensure ? that ? the ? Vosp ? and ? Vosm ? see ? balanced ?
impedances, ? it ? is ? advisable ? to ? use ? R comp ? such ? that: ?
Ceramic ? capacitors ? are ? recommended ? due ? to ? their ? peak ?
current ? capabilities. ? They ? also ? feature ? low ? ESR ? and ? ESL ? at ?
higher ? frequency ? which ? enables ? better ? efficiency. ? For ? this ?
application, ? it ? is ? advisable ? to ? have ? 5x22uF ? 16V ? ceramic ?
capacitors ? ECJ ‐ 3YX1C106K ? from ? Panasonic. ? In ? addition ? to ?
these, ? although ? not ? mandatory, ? a ? 1X330uF, ? 25V ? SMD ?
capacitor ? EEV ‐ FK1E331P ? may ? also ? be ? used ? as ? a ? bulk ?
capacitor ? and ? is ? recommended ? if ? the ? input ? power ? supply ? is ?
not ? located ? close ? to ? the ? converter. ?
INDUCTOR ? SELECTION ??
The ? inductor ? is ? selected ? based ? on ? output ? power, ? operating ?
frequency ? and ? efficiency ? requirements. ? A ? low ? inductor ?
value ? causes ? large ? ripple ? current, ? resulting ? in ? the ? smaller ?
size, ? and ? a ? faster ? response ? to ? a ? load ? transient ? but ? poor ?
R comp ? R top || R bot ? 402 ?
(10) ?
efficiency ? and ? high ? output ? noise. ? Generally, ? the ? selection ?
of ? the ? inductor ? value ? can ? be ? reduced ? to ? the ? desired ?
SOFT ‐ START ? PROGRAMMING ?
The ? soft ‐ start ? timing ? can ? be ? programmed ? by ? selecting ? the ?
soft ‐ start ? capacitance ? value. ? From ? (1), ? for ? a ? desired ? start ‐
up ? time ? of ? the ? converter, ? the ? soft ? start ? capacitor ? can ? be ?
calculated ? by ? using: ?
maximum ? ripple ? current ? in ? the ? inductor. ? The ? optimum ?
point ? is ? usually ? found ? between ? 20% ? and ? 50% ? ripple ? of ? the ?
output ? current. ?
For ? the ? buck ? converter, ? the ? inductor ? value ? for ? the ? desired ?
operating ? ripple ? current ? can ? be ? determined ? using ? the ?
following ? relation: ?
V in ? V o ? L ?
; ? t ? D ?
C SS ( ? F) ? T start ( ms ) ? 0.033 (11) ?
Where ? T start ? is ? the ? desired ? start ‐ up ? time ? (ms). ?
For ? a ? start ‐ up ? time ? of ? 3ms, ? the ? soft ‐ start ? capacitor ? will ? be ?
? i
? t
L ? ? V in ? V o ? ?
1
F s
V o
V in ? ? i * F s
(14) ?
0.099 μ F. ? Choose ? a ? 0.1 μ F ? ceramic ? capacitor. ?
Where: ?
INPUT ? CAPACITOR ? SELECTION ??
The ? ripple ? current ? generated ? during ? the ? on ? time ? of ? the ?
upper ? MOSFET ? should ? be ? provided ? by ? the ? input ? capacitor. ?
The ? RMS ? value ? of ? this ? ripple ? is ? expressed ? by: ?
V in ? = ? Maximum ? input ? voltage ?
V 0 ? = ? Output ? Voltage ?
Δ i ? = ? Inductor ? Ripple ? Current ?
F s ? = ? Switching ? Frequency ?
Δ t ? – ? Turn ? on ? time ?
I RMS ? I o ? D ? ( 1 ? D )
(12) ?
?
D ? – ? Duty ? Cycle ?
D ?
Where: ?
V o
V in
(13) ?
If ?? Δ i ?≈? 35%( I o ), ? then ? the ? output ? inductor ? is ? calculated ? to ? be ?
0.29 μ H. ? Select ? L ? = ? 0.3 μ H. ??
The ? 59PR9874N ? from ? Vitec ? provides ? a ? compact ? inductor ?
suitable ? for ? this ? application. ?
D ? is ? the ? Duty ? Cycle ?
I RMS ? is ? the ? RMS ? value ? of ? the ? input ? capacitor ? current. ??
Io ? is ? the ? output ? current. ?
For ? I o =25A ? and ? D ? = ? 0.15, ? the ? I RMS ?? = ? 8.93A. ?
20
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。