参数资料
型号: ISL6334DCRZ
厂商: Intersil
文件页数: 26/28页
文件大小: 0K
描述: IC CTRLR PWM 4PHASE VR11.1 40QFN
标准包装: 50
应用: 控制器,Intel VR11.1
输入电压: 3 V ~ 12 V
输出数: 1
输出电压: 0.5 V ~ 1.6 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 40-VFQFN 裸露焊盘
供应商设备封装: 40-QFN(6x6)
包装: 管件
ISL6334D
0.3
I L(P-P) = 0
I L(P-P) = 0.5 I O
0.6
0.2
0.1
I L(P-P) = 0.25 I O
I L(P-P) = 0.75 I O
0.4
0.2
I L(P-P) = 0
I L(P-P) = 0.5 I O
I L(P-P) = 0.75 I O
0
0
0.2
0.4
0.6
0.8
1.0
0
0
0.2
0.4
0.6
0.8
1.0
DUTY CYCLE (V O/ V IN )
FIGURE 20. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
For a 2-phase design, use Figure 18 to determine the input
capacitor RMS current requirement given the duty cycle,
maximum sustained output current (I O ), and the ratio of the
per-phase peak-to-peak inductor current (I L(P-P) ) to I O .
Select a bulk capacitor with a ripple current rating which will
minimize the total number of input capacitors required to
support the RMS current calculated. The voltage rating of
the capacitors should also be at least 1.25x greater than the
maximum input voltage.
Figures 19 and 20 provide the same input RMS current
information for 3- and 4-phase designs respectively. Use the
same approach to selecting the bulk capacitor type and
number, as previously described.
Low capacitance, high-frequency ceramic capacitors are
needed in addition to the bulk capacitors to suppress leading
and falling edge voltage spikes. The result from the high
current slew rates produced by the upper MOSFETs turn on
and off. Select low ESL ceramic capacitors and place one as
close as possible to each upper MOSFET drain to minimize
board parasitic impedances and maximize suppression.
26
DUTY CYCLE (V O/ V IN )
FIGURE 21. NORMALIZED INPUT-CAPACITOR RMS
CURRENT vs DUTY CYCLE FOR SINGLE-PHASE
CONVERTER
MULTIPHASE RMS IMPROVEMENT
Figure 21 is provided as a reference to demonstrate the
dramatic reductions in input-capacitor RMS current upon the
implementation of the multiphase topology. For example,
compare the input RMS current requirements of a 2-phase
converter versus that of a single phase. Assume both
converters have a duty cycle of 0.25, a maximum sustained
output current of 40A, and a ratio of I L(P-P) to I O of 0.5. The
single phase converter would require 17.3A RMS current
capacity while the two-phase converter would only require
10.9A RMS . The advantages become even more pronounced
when output current is increased and additional phases are
added to keep the component cost down relative to the
single phase approach.
Layout Considerations
The following layout strategies are intended to minimize the
impact of board parasitic impedances on converter
performance and to optimize the heat-dissipating capabilities
of the printed-circuit board. These sections highlight some
important practices which should not be overlooked during the
layout process.
FN6802.3
November 22, 2013
相关PDF资料
PDF描述
GSC35DRTN-S93 CONN EDGECARD 70POS DIP .100 SLD
ISL6536IB IC SUPERVISOR 4-CHAN 8-SOIC
ISL6334DCRZ-T IC CTRLR PWM 4PHASE VR11.1 40QFN
MIC5330-PGYML TR IC REG LDO 3V/1.8V .3A 8-MLF
ISL6334AIRZ-T IC CTRLR PWM 4PHASE BUCK 40-QFN
相关代理商/技术参数
参数描述
ISL6334DCRZ-T 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
ISL6334DIRZ 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
ISL6334DIRZ-T 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
ISL6334IRZ 功能描述:IC CTRLR PWM 4PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
ISL6334IRZ-T 功能描述:IC CTRLR PWM 4PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件