参数资料
| 型号： | ISL6324IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 34/38页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM DUAL 48-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 2 |
| 输出电压： | 最高 2V |
| 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： | 带卷 (TR) |
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ISL6324
The output inductors must be capable of assuming the entire
load current before the output voltage decreases more than
Δ V MAX . This places an upper limit on inductance.
handle the AC component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
Equation 54 gives the upper limit on L for the cases when
the trailing edge of the current transient causes a greater
0.3
I L(P-P) = 0
I L(P-P) = 0.25 I O
I L(P-P) = 0.5 I O
I L(P-P) = 0.75 I O
output-voltage deviation than the leading edge. Equation 55
addresses the leading edge. Normally, the trailing edge
dictates the selection of L because duty cycles are usually
less than 50%. Nevertheless, both inequalities should be
evaluated, and L should be selected based on the lower of
the two results. In each equation, L is the per-channel
inductance, C is the total output capacitance, and N is the
0.2
L ≤ --------------------------------- ? Δ V MAX – ( Δ I ? ESR )
number of active channels.
2 ? N ? C ? V O
( Δ I ) 2
(EQ. 54)
0.1
L ≤ ----------------------------- ? Δ V MAX – ( Δ I ? ESR ) ? ? V IN – V O ?
( Δ I ) 2
1.25 ? N ? C
? ?
(EQ. 55)
0
0
0.2
0.4 0.6
DUTY CYCLE (V O/ V IN )
0.8
1.0
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 27, and they establish the upper limit for
the switching frequency. The lower limit is established by the
requirement for fast transient response and small output-
voltage ripple as outlined in “Output Filter Design” on page 33.
Choose the lowest switching frequency that allows the
regulator to meet the transient-response requirements.
Switching frequency is determined by the selection of the
frequency-setting resistor, R T . Figure 25 and Equation 56
are provided to assist in selecting the correct value for R T .
FIGURE 26. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
For a four-phase design, use Figure 26 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
1.25x greater than the maximum input voltage. Figures 27
and 28 provide the same input RMS current information for
3-phase and 2-phase designs respectively. Use the same
R T = 10
[ 10.61 – ( 1.035 ? log ( f S ) ) ]
1k
(EQ. 56)
approach for selecting the bulk capacitor type and number.
0.3
I L(P-P) = 0 I L(P-P) = 0.5 I O
I L(P-P) = 0.25 I O
I L(P-P) = 0.75 I O
0.2
100
0.1
10
10k 100k 1M
SWITCHING FREQUENCY (Hz)
FIGURE 25. R T vs SWITCHING FREQUENCY
10M
0
0 0.2 0.4 0.6 0.8
DUTY CYCLE (V IN/ V O )
FIGURE 27. NORMALIZED INPUT-CAPACITOR RMS
1.0
CURRENT FOR 3-PHASE CONVERTER
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
34
Low capacitance, 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
FN6518.2
September 25, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6326AIRZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6326BCRZ | 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 |
| ISL6326BCRZ-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 |
| 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 |
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