参数资料
| 型号： | ISL6336ACRZ |
| 厂商： | Intersil |
| 文件页数： | 29/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 6PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 应用： | 控制器，Intel VR11.1 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 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 |
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页第28页当前第29页第30页第31页
ISL6336, ISL6336A
and small output-voltage ripple as outlined in “Output Filter
Design” on page 28. Choose the lowest switching frequency
that allows the regulator to meet the transient-response
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
requirements.
Switching frequency is determined by the selection of the
provided to assist in selecting the correct value for R T .
Input Capacitor Selection
0.2
0.1
The input capacitors are responsible for sourcing the AC
0
0
0.2
0.4
0.6
0.8
1.0
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 that is related to duty cycle and the number of
active phases.
0.3
0.2
DUTY CYCLE (V O/ V IN )
FIGURE 23. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
For a two phase design, use Figure 21 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(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.
0.1
I L(P-P) = 0
I L(P-P) = 0.5 I O
I L(P-P) = 0.75 I O
Figures 22 and 23 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 previously described.
0
0
0.2
0.4
0.6
0.8
1.0
Low capacitance, high-frequency ceramic capacitors are
DUTY CYCLE (V O /V IN )
FIGURE 21. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 2-PHASE CONVERTER
needed in addition to the bulk capacitors to suppress leading
and falling edge voltage spikes. They result from the high
current slew rates produced by the upper MOSFETs turning
on and off. Select low ESL ceramic capacitors and place one
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
as close as possible to each upper MOSFET drain to
minimize board parasitic impedances and maximize
suppression. More than one of these low ESL capacitors
may be needed.
0.2
0.1
MULTIPHASE RMS IMPROVEMENT
Figure 24 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
converter versus that of a single phase. Assume both
converters have a duty cycle of 0.25, maximum sustained
0
0
0.2
0.4 0.6
DUTY CYCLE (V O/ V IN )
0.8
1.0
output current of 40A, and a ratio of I L(P-P) to I O of 0.5. The
single phase converter would require 17.3A RMS current
capacity while the two-phase converter would only require
FIGURE 22. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 3-PHASE CONVERTER
29
10.9A RMS . The advantages become even more pronounced
when output current is increased and additional phases are
added to keep the component cost down relative to the
single phase approach.
FN6504.1
May 28, 2009
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