参数资料
| 型号： | ISL6323BCRZ |
| 厂商： | Intersil |
| 文件页数： | 33/36页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR SYNC BUCK DL 48QFN |
| 标准包装： | 43 |
| 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： | 0°C ~ 70°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 |
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ISL6323B
1k
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
0.2
100
0.1
10
10k
100k
1M
10M
SWITCHING FREQUENCY (Hz)
FIGURE 24. R T vs SWITCHING FREQUENCY
0
0
0.2
0.4 0.6
DUTY CYCLE (V IN/ V O )
0.8
1.0
FIGURE 26. NORMALIZED INPUT-CAPACITOR RMS
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
CURRENT FOR 3-PHASE CONVERTER
0.3
0.2
0.2
0.1
0.1
I L(P-P) = 0
0
0 0.2 0.4 0.6 0.8 1.0
DUTY CYCLE (V O/ V IN )
FIGURE 25. NORMALIZED INPUT-CAPACITOR RMS CURRENT
0
0
I L(P-P) = 0.5 I O
I L(P-P) = 0.75 I O
0.2
0.4
0.6
0.8
1.0
vs DUTY CYCLE FOR 4-PHASE CONVERTER
For a four-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
1.25x greater than the maximum input voltage. Figures 26 and
27 provide the same input RMS current information for 3-phase
and two-phase designs respectively. Use the same approach
for selecting the bulk capacitor type and number.
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
the high current slew rate produced by the upper MOSFET
turn on and off. Select low ESL ceramic capacitors and place
one as close as possible to each upper MOSFET drain to
minimize board parasitics and maximize suppression.
33
DUTY CYCLE (V IN/ V O )
FIGURE 27. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR 2-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
selection, layout, and placement minimizes these voltage
spikes. Consider, as an example, the turnoff transition of the
upper PWM MOSFET. Prior to turnoff, the upper MOSFET
was carrying channel current. During the turnoff, current
stops flowing in the upper MOSFET and is picked up by the
lower MOSFET. Any inductance in the switched current path
generates a large voltage spike during the switching interval.
Careful component selection, tight layout of the critical
components, and short, wide circuit traces minimize the
magnitude of voltage spikes.
FN6879.1
May 12, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6323BCRZR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONT. FOR CORE+NORTHBRIDGE, 2 PHASE PSI, 3.4MHZ SV - Rail/Tube 制造商:Intersil Corporation 功能描述:IC PWM CTRLR SYNC BUCK DL 48QFN 制造商:Intersil 功能描述:4+1 PHS CONT CORE + NORTHBRDG PROG |
| ISL6323BCRZ-T | 功能描述:IC PWM CTRLR SYNC BUCK DL 48QFN 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 |
| ISL6323BCRZ-TR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONT. FOR CORE+NORTHBRIDGE, 2 PHASE PSI, 3.4MHZ S - Tape and Reel 制造商:Intersil Corporation 功能描述:IC PWM CTRLR SYNC BUCK DL 48QFN 制造商:Intersil 功能描述:4+1 PHS CONT CORE + NORTHBRDG PROG |
| ISL6323BCRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6323BCRZ-T WITH GOLD BOND WIRE ONLY, T&R - Tape and Reel |
| ISL6323BIRZ | 功能描述:IC PWM CTRLR SYNC BUCK DL 48QFN 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 |
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