参数资料
| 型号： | ISL6308CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 3PHASE BUCK 40-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，DDR |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.3 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) |
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ISL6308
Switching frequency is determined by the selection of the
frequency-setting resistor, R FS . Figure 23 and Equation 43
are provided to assist in selecting the correct value for R FS
should also be at least 1.25 times greater than the maximum
input voltage. Figures 25 and 26 provide the same input
RMS current information for two-phase and single-phase
R FS = 10
[ 10.61 – 1.035 ? log ( F
SW
) ]
(EQ. 43)
designs respectively. Use the same approach for selecting
the bulk capacitor type and number.
0.3
200
0.2
100
50
0.1
I L,PP = 0
20
I L,PP = 0.5 I O
I L,PP = 0.75 I O
10
0
0
0.2
0.4
0.6
0.8
1.0
100k
200k 500k 1M
SWITCHING FREQUENCY (Hz)
2M
DUTY CYCLE (V IN/ V O )
FIGURE 25. NORMALIZED INPUT-CAPACITOR RMS
FIGURE 23. R FS vs SWITCHING FREQUENCY
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.
0.6
0.4
CURRENT FOR 2-PHASE CONVERTER
0.3
I L,PP = 0
I L,PP = 0.5 I O
0.2
I L,PP = 0.25 I O
I L,PP = 0.75 I O
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 IN /V O )
0.1
FIGURE 26. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR SINGLE-PHASE CONVERTER
Low ESL, high-frequency ceramic capacitors are needed in
addition to the input bulk capacitors to suppress leading and
0
0 0.2 0.4 0.6 0.8
DUTY CYCLE (V IN/ V O )
FIGURE 24. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR 3-PHASE CONVERTER
1.0
falling edge voltage spikes. The spikes result from the high
current slew rate produced by the upper MOSFET turn on
and off. Place them as close as possible to each upper
MOSFET drain to minimize board parasitics and maximize
suppression.
For a three-phase design, use Figure 24 to determine the
input-capacitor RMS current requirement set by the duty
cycle, maximum sustained output current (I O ), and the ratio
of the 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
25
Layout Considerations
MOSFETs switch very fast and efficiently. The speed with
which the current transitions from one device to another
causes voltage spikes across the interconnecting
impedances and parasitic circuit elements. These voltage
spikes can degrade efficiency, radiate noise into the circuit
FN9208.4
September 30, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6308CRZ-TR5374 | 制造商:Intersil Corporation 功能描述:ISL6308CRZ W/ 24HR BURN-IN - Tape and Reel 制造商:Intersil Corporation 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN 制造商:Intersil 功能描述:ISL6308CRZ W/24HRU RN-IN |
| ISL6308CRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6308CRZ-T W/GOLD BOND WIRE ONLY - Tape and Reel |
| ISL6308EVAL1Z | 制造商:Intersil Corporation 功能描述:ISL6308 EVALUATION BOARD 1 - ROHS COMPLIANT - QFN - Bulk |
| ISL6308IRZ | 功能描述:电压模式 PWM 控制器 DAC-LESS MULTI-PHS PWM CNTRLR W/3-DRVRS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6308IRZ-T | 功能描述:电压模式 PWM 控制器 DAC-LESS MULTI-PHS PWM CNTRLR W/3-DRVRS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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