参数资料
| 型号： | ISL6322GIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 35/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 48-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.99 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： | 带卷 (TR) |
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ISL6322G
bulk capacitor ESR equal to I C(P-P) (ESR). Thus, once the
output capacitors are selected, the maximum allowable
ripple voltage, V (P-P)(MAX) , determines the lower limit on the
inductance.
1000
IN – N ? V OUT ? V OUT
? V ?
L ≥ ESR ? --------------------------------------------------------------------
? ?
f S ? V IN ? V ( P-P ) ( MAX )
(EQ. 38)
100
Since the capacitors are supplying a decreasing portion of
the load current while the regulator recovers from the
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.
10
10k
100k 1000k
SWITCHING FREQUENCY (Hz)
10000k
Equation 39 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 40
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 number of active channels.
FIGURE 23. R T 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
handle the ac component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
For a two-phase design, use Figure 24 to determine the
input-capacitor RMS current requirement set by the duty
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
Switching Frequency
? ?
(EQ. 39)
(EQ. 40)
cycle, maximum sustained output current (I O ), and the ratio
of the peak-to-peak inductor current (I L,(P-P) ) to I O .
0.3
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 31, and they establish the
0.2
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
frequency that allows the regulator to meet the
0.1
I L(P-P) = 0
I L(P-P) = 0.5 I O
I L(P-P) = 0.75 I O
transient-response requirements.
0
0
0.2
0.4
0.6
0.8
1.0
Switching frequency is determined by the selection of the
frequency-setting resistor, R T . Figure 23 and Equation 41
are provided to assist in selecting the correct value for R T .
DUTY CYCLE (V IN/ V O )
FIGURE 24. NORMALIZED INPUT-CAPACITOR RMS
CURRENT FOR 2-PHASE CONVERTER
Select a bulk capacitor with a ripple current rating which will
R T = 10
[ 10.61 – ( 1.035 ? log ( f S ) ) ]
(EQ. 41)
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. Figure 25 provides the same input
RMS current information for single-phase designs. Use the
same approach for selecting the bulk capacitor type and
number.
35
FN6715.0
May 22, 2008
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| ISL6322IRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6322IRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6323ACRZ | 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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