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| 型号： | ISL8102EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 24/27页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL8102 |
| 标准包装： | 1 |
| 系列： | * |
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ISL8102
Switching Frequency
There are a number of variables to consider when choosing
the switching frequency, as there are considerable effects on
the upper MOSFET loss calculation. These effects are
outlined in “MOSFETs” on page 17, and they establish the
upper limit for the switching frequency. The lower limit is
established by the requirement for fast transient response
that allows the regulator to meet the transient-response
requirements.
current information for single-phase designs. Use the same
approach for selecting the bulk capacitor type and number.
Low ESL, high-frequency ceramic capacitors are needed in
addition to the input bulk capacitors to suppress leading and
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.
0.3
Switching frequency is determined by the selection of the
frequency-setting resistor, R FS . Figure 24 and Equation 40
are provided to assist in selecting the correct value for R FS .
0.2
R FS = 10
[ 10.61 – 1.035 ? log ( F
SW
) ]
(EQ. 40)
0.1
I L,P-P = 0
I L,P-P = 0.5 I O
200
I L,P-P = 0.75 I O
0
0
0.2
0.4
0.6
0.8
1.0
100
50
DUTY CYCLE (V IN/ V O )
FIGURE 25. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR 2-PHASE CONVERTER
0.6
20
10
100k
200k
500k
1M
2M
0.4
SWITCHING FREQUENCY (Hz)
FIGURE 24. 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
0.2
I L,P-P = 0
I L,P-P = 0.5 I O
I L,P-P = 0.75 I O
handle the ac component of the current drawn by the upper
0
0
0.2
0.4
0.6
0.8
1.0
MOSFETs which is related to duty cycle and the number of
active phases.
For a two-phase design, use Figure 25 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,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 1.25 times greater than the maximum
input voltage. Figure 26 provides the same input RMS
24
DUTY CYCLE (V IN /V O )
FIGURE 26. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR SINGLE-PHASE CONVERTER
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
and lead to device overvoltage stress. Careful component
layout and printed circuit design minimizes the voltage
FN9247.1
July 28, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8102IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL8102IRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL8103 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers |
| ISL8103CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL8103CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
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