- 您现在的位置：买卖IC网 > PDF目录15164 > ISL6326BCRZ-T (Intersil)IC REG CTRLR BUCK PWM VM 40-QFN PDF资料下载
参数资料
| 型号： | ISL6326BCRZ-T |
| 厂商： | Intersil |
| 文件页数： | 28/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 275kHz |
| 占空比： | 25% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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页第21页第22页第23页第24页第25页第26页第27页当前第28页第29页第30页
ISL6326B
voltage ripple as outlined in Output Filter Design . Choose the
lowest switching frequency that allows the regulator to meet
the transient-response requirements.
Input Capacitor Selection
The input capacitors are responsible for sourcing the AC
component of the input current flowing into the upper
MOSFETs. Their RMS current capacity must be sufficient to
handle the AC component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
0.3
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 18 and 19 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
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
0.1
0.3
0.2
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
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
0.1
DUTY CYCLE (V O /V IN )
FIGURE 17. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 2-PHASE CONVERTER
0
0
0.2
0.4
0.6
0.8
1.0
0.3
0.2
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
DUTY CYCLE (V O/ V IN )
FIGURE 19. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
MULTIPHASE RMS IMPROVEMENT
Figure 20 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 two-phase
0.1
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 L,PP to I O of 0.5. The
single phase converter would require 17.3Arms current
0
0
0.2
0.4 0.6
DUTY CYCLE (V O/ V IN )
0.8
1.0
capacity while the two-phase converter would only require
10.9Arms. The advantages become even more pronounced
when output current is increased and additional phases are
FIGURE 18. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 3-PHASE CONVERTER
For a two phase design, use Figure 17 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
28
added to keep the component cost down relative to the
single phase approach.
FN9286.0
April 21, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| H2BBG-10102-G4-ND | JUMPER-H1501TR/A2015G/H1501TR 2" |
| ISL9506HRZ-T | IC REG CTRLR BUCK PWM 40-QFN |
| VE-J51-EY-F4 | CONVERTER MOD DC/DC 12V 50W |
| RGM08DTAS-S189 | CONN EDGECARD 16POS R/A .156 SLD |
| H2BBG-10102-B4-ND | JUMPER-H1501TR/A2015B/H1501TR 2" |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6326BIRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326BIRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6326CRZ-T W/GOLD BOND WIRE ONLY - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。