参数资料
| 型号： | ISL6561CR-T |
| 厂商： | Intersil |
| 文件页数： | 24/26页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM MULTIPHASE 40-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel VR10X |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 4 |
| 输出电压： | 0.84 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： | 带卷 (TR) |
ISL6561
0.3
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.
0.2
0.3
I L,PP = 0
I L,PP = 0.25 I O
I L,PP = 0.5 I O
I L,PP = 0.75 I O
0.2
0.1
I L,PP = 0
I L,PP = 0.5 I O
I L,PP = 0.75 I O
0.1
0
0
0.2
0.4
0.6
0.8
1.0
DUTY CYCLE (V O / V IN )
FIGURE 16. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 2-PHASE CONVERTER
0
0
0.2
0.4
0.6
0.8
1.0
DUTY CYCLE (V O / V IN )
0.3
I L,PP = 0
I L,PP = 0.25 I O
I L,PP = 0.5 I O
I L,PP = 0.75 I O
FIGURE 18. NORMALIZED INPUT-CAPACITOR RMS CURRENT
VS DUTY CYCLE FOR 4-PHASE CONVERTER
MULTI-PHASE RMS IMPROVEMENT
0.2
0.1
Figure 19 is provided as a reference to demonstrate the
dramatic reductions in input-capacitor RMS current upon the
implementation of the multi-phase topology. For example,
compare the input rms current requirements of a two-phase
converter versus that of a single phase. Assume both
converters have a duty cycle of 0.25, maximum sustained
output current of 40A, and a ratio of I C,PP to I O of 0.5. The
single phase converter would require 17.3 Arms current
0
0
0.2
0.4
0.6
0.8
1.0
capacity while the two-phase converter would only require
10.9 Arms. The advantages become even more pronounced
DUTY CYCLE (V O / V IN )
FIGURE 17. NORMALIZED INPUT-CAPACITOR RMS CURRENT
VS DUTY CYCLE FOR 3-PHASE CONVERTER
For a two phase design, use Figure 16 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,PP ) 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 1.25 times greater
than the maximum input voltage.
Figures 17 and 18 provide the same input RMS current
information for three and four phase designs respectively.
Use the same approach to selecting the bulk capacitor type
and number as described above.
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
24
when output current is increased and additional phases are
added to keep the component cost down relative to the
single phase approach.
0.6
0.4
0.2
I L,PP = 0
I L,PP = 0.5 I O
I L,PP = 0.75 I O
0
0 0.2 0.4 0.6 0.8 1.0
DUTY CYCLE (V O / V IN )
FIGURE 19. NORMALIZED INPUT-CAPACITOR RMS CURRENT
VS DUTY CYCLE FOR SINGLE-PHASE
CONVERTER
FN9098.5
May 12, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6561CRZ | 功能描述:IC CTRLR PWM MULTIPHASE 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 |
| ISL6561CRZ | 制造商:Intersil Corporation 功能描述:Pulse Width Modulation (PWM) Controller |
| ISL6561CRZA | 功能描述:IC CTRLR PWM MULTIPHASE 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 |
| ISL6561CRZA-T | 功能描述:IC CTRLR PWM MULTIPHASE 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 |
| ISL6561CRZR5208 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
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