|
|||||||||
 |
|
||||||||
|
|
||||||||||||||
| . 网站首页 . 新闻 . 新品 . 方案 . 专访 . 活动 . DSP . EDA . 评测室 . 技术文库 . 会员区 . 商城 . 服务导航 . 邮购 . 资源 . | ||
 |
||
|
||
|
|||||
| Intersil ISL6228笔记本电脑电源方案 | |||||
作者：Intersil 文章来源：本站原创 点击数： 更新时间：2007-9-26  |
|||||
|
概述： High-Performance Dual-Output Buck Controller for Notebook Applications The ISL6228 IC is a dual channel synchronous-buck PWM controller featuring Intersils Robust Ripple Regulator (R3) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers and bootstrap diodes result in fewer components and smaller implementation area. Intersil’s R3 technology combines the best features of fixedfrequency and hysteretic PWMs while eliminating many of their shortcomings. R3 technology employs an innovative modulator that synthesizes an AC ripple voltage signal VR, analogous to the output inductor ripple current. The AC signal VR enters a window comparator where the lower threshold is the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation of the PWM signal. The voltage reference VW sets the steady-state PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixedfrequency PWM controllers. Unlike a conventional hysteretic converter, each channel of the ISL6228 has an error amplifier that provides ±1% voltage regulation at the FB pin. The ISL6228 has a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6228 operates in continuous-conduction-mode (CCM) in heavy load, and in diode-emulation-mode (DEM) in light load to improve light-load efficiency. In CCM, the controller always operates as a synchronous rectifier. In DEM, the low-side MOSFET is permitted to stay off, blocking negative current flow into the low-side MOSFET from the output inductor.  ISL6228 主要特性： High performance R3 technology Fast transient response ±1% regulation accuracy: -10°C to +100°C Individual power stage input rail for each channel Wide input voltage range: +3.3V to +25V Output voltage range: +0.6V to +5V Diode emulation mode for increased light load efficiency Programmable PWM frequency: 200kHz to 600kHz Pre-biased output start-up capability Integrated MOSFET drivers and bootstrap diode Internal digital soft-start Power good monitor Fault protection - Undervoltage protection - Soft crowbar overvoltage protection - Inductor DCR overcurrent protection - Over-temperature protection - Fault identification by PGOOD pull-down resistance Pb-free available (RoHS compliant) 应用： General purpose switching buck regulators PCI express graphical processing unit Auxiliary power rail VRM Network adapter 图1。ISL6228方框图。  图2。ISL6228应用电路图。  详情请见ISL6228数据表： http://www.intersil.com/data/fn/fn9095.pdf 下面是评估板 ISL6228EVAL3Z评估板的性能和电路图介绍。 The ISL6228EVAL3Z evaluation board demonstrates the performance of the ISL6228 dual-channel PWM controller. The ISL6228 features Intersils Robust Ripple Regulator (R3) technology. Channel-1 output voltage is 1.5V or 1.8V, pending the state of switch S5. Channel-2 output voltage is 1.8V. Each channel has an on-board dynamic-load generator included for evaluating the transient-load response. It applies a 300μs pulse of 4.5A load across VO1 and GND, and it applies a 300μs pulse of 5A load across VO2 and GND. Contents of this document include: Recommended Test Equipment Interface Connections Switch Descriptions Test Point Descriptions Design Criteria Typical Performance - Efficiency - Start-up - Shut-down - Steady State, CCM - Steady State, DCM - Load-transient response Evaluation Board Documentation - Bill of materials - Schematic - Silk-screen plots - Board layer plots  图3。评估板 ISL6228EVAL3Z 电路图 下面是评估板 ISL6228EVAL3Z 材料清单（BOM）：   详情请见评估板应用手册： >http://www.intersil.com/data/an/an1291.pdf |
|||||
| 欢迎点击进入：TI德州中文网 (国内唯一针对TI应用的中文技术网站) 文章录入：admin 责任编辑：admin | |||||
| 【发表评论】【加入收藏】【告诉好友】【打印此文】【关闭窗口】 | |||||
| 最新热点 | 最新推荐 | 相关文章 | ||
| Intersil汽车TFT-LCD显示器电… Intersil IPTV机顶盒解决方案 Intersil PDA解决方案 Intersil游戏控制台解决方案 Intersil 家庭影院接收器解决… Intersil有源亚低音扩音器解… Intersil CCTV解决方案 Intersil CD/DVD驱动器解决方… |
| 网友评论：（只显示最新10条。评论内容只代表网友观点，与本站立场无关！） |
| | 设为首页 | 加入收藏 | 联系站长 | 友情链接 | 版权申明 | 网站公告 | 管理登录 | | |||
|
