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參數(shù)資料
| 型號(hào)： | ISL6560EVAL1 |
| 廠商： | Intersil Corporation |
| 英文描述： | Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller |
| 中文描述： | 微處理器核心電壓調(diào)節(jié)兩相降壓PWM控制器 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 396K |
| 代理商： | ISL6560EVAL1 |
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8
FN9011.3
Design Example
This section will highlight a 40A converter, providing the
design details for the entire supply. The hardware realization
of this design is the ISL6560/62 Evaluation Board. For this
example a 40A supply down converting from 12V will be
discussed. 5V operation is also viable as an input source.
Oscillator frequency is 350kHz, with a channel frequency of
175kHz. The ISL6560 has an internal DAC with VRM 9.0
VID codes. An output voltage of 1.8V, near the maximum
output voltage will be used to determine the selection of
inductors. Output voltage droop from no-load to full load
specification is ~65mv. This sets the effective DC output
resistance, (R
OUT
) to be 65mV/40A = 1.63m
.
Inductor Selection
Each channel handles half of the 40A output. An inductor
ripple current of 40% of the output current or 8A p-p/channel
was selected. There is always a compromise between ripple
current and regulator performance. Higher values of ripple
current, as expected, result in slightly greater dissipation in
series pass transistors and losses in other resistive elements
in the power path. These disadvantages are offset by
improved transient response, with lower values of output
capacitors and less output voltage overshoot when the
output current is step reduced from heavy load conditions.
This overshoot is primarily contributed by the energy stored
in the output filter network and is not highly influenced by the
control loop.
To assist in the selection of the output inductors, two curves
are provided. Figure 4 deals with the selection of the voltage
terms in the equation:
Where:
L
=
inductor value
V
IN
= input voltage
V
OUT
= output voltage or CORE Voltage
fsw = oscillator frequency/2 (for each channel)
I
L
=
inductor ripple current
The (V
IN
- V
OUT
) term is the voltage across the inductor and
the V
OUT
/V
IN
term is the converter duty cycle.
The curve of Figure 4 reduces the voltage terms to a single
voltage term, “K”. To further enhance readability of the curves,
the lower portion of Figure 4 was expanded in Figure 5 for output
voltages up to only 3.5V. The dotted lines show the selection of
an output voltage of 1.8V. With 12V input, K = 1.55V.
The curve of Figure 6 shows with the selection of the inductor
value. Initially a ripple current of 40% of the full load current was
established. Each channel contributes 20A, for a ripple current,
I
L
,
of 8A. From this, the value entered into the left-hand axis of
Figure 6 is 1.55V/8A = 0.19. With a channel operating
frequency of 200kHz, the inductor value will be 900nH, as
shown by the dotted lines. This curve shows how you can
modify the inductor value by changing the ripple current since
the “K” term is fixed by the input output design criteria.
L =(V
IN
- V
OUT
) V
OUT
fsw x
I
L
V
IN
0
2
4
6
8
10
12
V
OUT
(VOLTS)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
K
V
IN
= 12V
V
IN
= 5V
V
IN
= 10V
V
IN
= 8V
L
=
(V
IN
- V
OUT
) V
OUT
fsw x
I
L
V
IN
FIGURE 4. “K” AS A FUNCTION OF V
OUT
FOR
FAMILIES OF V
IN
K
=(V
IN
- V
OUT
) V
OUT
V
IN
L
=
K
fsw x
I
L
V
IN
= 3.3V
2.5
2.0
1.5
1.0
0.5
0
0
0.5
1.0
1.5
V
OUT
(VOLTS)
2.0
2.5
3.0
3.5
K
V
IN
= 12V
V
IN
= 10V
V
IN
= 8V
V
IN
= 5V
V
IN
= 3.3V
FIGURE 5. EXPANSION OF FIGURE 4 FOR V
OUT
< 3.5V
ISL6560
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PDF描述 |
|---|---|
| ISL656062EVAL1 | Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller |
| ISL6560CBZ-T | Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller |
| ISL6561IRZ-T | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| ISL6561CR-T | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| ISL6561CR | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6561CR | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN 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) |
| ISL6561CR-T | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN 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) |
| ISL6561CRZ | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN 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 |
| ISL6561CRZ | 制造商:Intersil Corporation 功能描述:Pulse Width Modulation (PWM) Controller |
| ISL6561CRZA | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN 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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