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參數(shù)資料
| 型號： | ISL6556A |
| 廠商： | Intersil Corporation |
| 英文描述： | Optimized Multi-Phase PWM Controller with 6-Bit DAC for VR10.X Application |
| 中文描述： | 優(yōu)化的多相位6位DAC的VR10.X PWM控制器的應(yīng)用 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大小： | 702K |
| 代理商： | ISL6556A |
21
Switching frequency is determined by the selection of the
frequency-setting resistor, R
T
(see the figures labeled
Typical Application
on pages 4 and 5). Figure 13 and
Equation 26 are provided to assist in selecting the correct
value for R
T
.
·
=
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 14 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,PP
) 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 1.25 times greater
than the maximum input voltage.
Figures 15 and 16 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 described above.
Low capacitance, high-frequency ceramic capacitors are
needed in addition to the bulk capacitors to suppress leading
and falling edge voltage spikes. The result from the high
current slew rates produced by the upper MOSFETs turn on
and off. Select low ESL ceramic capacitors and place one as
close as possible to each upper MOSFET drain to minimize
board parasitic impedances and maximize suppression.
FIGURE 13. R
T
vs SWITCHING FREQUENCY
100
1000
10000
10
SWITCHING FREQUENCY (kHz)
10
100
1000
R
T
)
R
T
1.0203
10
(
)
10.6258-
1.03167
(
)
f
S
(
)
log
[
]
1200
–
(EQ. 26)
0.3
0.1
0
0.2
I
R
/
O
)
FIGURE 14. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 2-PHASE CONVERTER
0
0.4
1.0
0.2
0.6
0.8
DUTY CYCLE (V
O
/V
IN
)
I
L,PP
= 0
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
DUTY CYCLE (V
O/
V
IN
)
FIGURE 15. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 3-PHASE CONVERTER
0
0.4
1.0
0.2
0.6
0.8
I
R
/
O
)
0.3
0.1
0
0.2
I
L,PP
= 0
I
L,PP
= 0.25 I
O
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
I
R
/
O
)
FIGURE 16. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 4-PHASE CONVERTER
0
0.4
1.0
0.2
0.6
0.8
DUTY CYCLE (V
O
/V
IN
)
0.3
0.1
0
0.2
I
L,PP
= 0
I
L,PP
= 0.25 I
O
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
ISL6556A
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| ISL6556ACB | 功能描述:IC CTRLR MULTIPHASE VRM10 28SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| ISL6556ACBR5208 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6556ACB-T | 功能描述:IC CTRLR MULTIPHASE VRM10 28SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| ISL6556ACBZ | 功能描述:IC CTRLR MULTIPHASE VRM10 28SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6556ACBZ-T | 功能描述:IC CTRLR MULTIPHASE VRM10 28SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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