参数资料
| 型号： | ISL6323CRZ |
| 厂商： | Intersil |
| 文件页数： | 32/36页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM MONO 48-QFN |
| 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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ISL6323
transient, the capacitor voltage becomes slightly depleted.
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.
Equation 56 gives the upper limit on L for the cases when
the trailing edge of the current transient causes a greater
output-voltage deviation than the leading edge. Equation 57
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.
addresses the leading edge. Normally, the trailing edge
dictates the selection of L because duty cycles are usually
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
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
number of active channels.
0.2
L ≤ --------------------------------- ? Δ V MAX – ( Δ I ? ESR )
L ≤ ----------------------------- ? Δ V MAX – ( Δ I ? ESR ) ? ? V IN – V O ?
( Δ I ) 2
2 ? N ? C ? V O
( Δ I ) 2
1.25 ? N ? C
? ?
(EQ. 56)
(EQ. 57)
0.1
Switching Frequency
0
0
0.2
0.4
0.6
0.8
1.0
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 25, 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.
Switching frequency is determined by the selection of the
frequency-setting resistor, R T . Figure 24 and Equation 58
are provided to assist in selecting the correct value for R T .
DUTY CYCLE (V O/ V IN )
FIGURE 25. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
For a 4-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
R T = 10
[ 10.61 – ( 1.035 ? log ( f S ) ) ]
1k
(EQ. 58)
3-phase and 2-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
100
one as close as possible to each upper MOSFET drain to
minimize board parasitics and maximize suppression.
10
60k
100k
1M
2M
SWITCHING FREQUENCY (Hz)
FIGURE 24. R T vs SWITCHING FREQUENCY
32
FN9278.5
May 17, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6323CRZR5285 | 制造商:Intersil Corporation 功能描述: |
| ISL6323CRZ-T | 功能描述:IC HYBRID CTRLR PWM MONO 48-QFN 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 |
| ISL6323EVAL1Z | 功能描述:EVAL BOARD 1 FOR ISL6323 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6323IRZ | 功能描述:IC HYBRID CTRLR PWM MONO 48-QFN 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 |
| ISL6323IRZ-T | 功能描述:IC HYBRID CTRLR PWM MONO 48-QFN 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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