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參數(shù)資料
| 型號(hào)： | ISL6563CR |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Phase Multi-Phase Buck PWM Controller with Integrated MOSFET Drivers |
| 中文描述： | SWITCHING CONTROLLER, 255 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220-VGGD-2, QFN-24 |
| 文件頁(yè)數(shù)： | 13/19頁(yè) |
| 文件大小： | 516K |
| 代理商： | ISL6563CR |
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13
FN9126.6
April 13, 2005
other voltage rail is available and above some selectable
threshold. For example, when down-converting off a 12V
input, it may be desirable the ISL6563-based converter does
not start up until the power input is sufficiently high. The
schematic in Figure 6 demonstrates coordination of the
ISL6563 with such a rail; the resistor components are
chosen to enable the ISL6563 as the 12V input exceeds
approximately 9.75V. Additionally, an open-drain or open-
collector device can be used to wire-AND a second (or
multiple) control signal, as shown in Figure 6. To defeat the
threshold-sensitive enable, connect ENLL to VCC directly or
via a pull-up resistor.
The ‘11111’ VID code is reserved as a signal to the controller
that no load is present. The controller is disabled while
receiving this VID code and will subsequently start up upon
receiving any other code.
In summary, for the ISL6563 to operate, the following
conditions need be met: VCC and PVCC must be greater
than their respective POR thresholds, the voltage at ENLL
must be greater than 0.61V, and VID has to be different than
‘11111’. Once all these conditions are met, the controller
immediately initiates a soft start sequence.
SOFT-START
The soft-start function allows the converter to bring up the
output voltage in a controlled fashion, resulting in a linear
ramp-up. Following a delay of 16 PHASE clock cycles (about
70
μ
s) between enabling the chip and the start of the ramp,
the output voltage progresses at a fixed rate of 12.5mV per
16 PHASE clock cycles.
Thus, the soft-start period (not including the 70
μ
s wait) up to
a given voltage, V
DAC
, can be approximated by the following
equation
where V
DAC
is the DAC-set VID voltage, and f
S
is the
switching frequency (typically 230kHz).
The ISL6563 also has the ability to start up into a pre-
charged output, without causing any unnecessary
disturbance. The FB pin is monitored during soft-start, and
should it be higher than the equivalent internal ramping
reference voltage, the output drives hold both MOSFETs off.
Once the internal ramping reference exceeds the FB pin
potential, the output drives are enabled, allowing the output
to ramp from the pre-charged level to the final level dictated
by the DAC setting. Should the output be pre-charged to a
level exceeding the DAC setting, the output drives are
enabled at the end of the soft-start period, leading to an
abrupt correction in the output voltage down to the DAC-set
level.
General Application Design Guide
This design guide is intended to provide a high-level
explanation of the steps necessary to create a multiphase
power converter. It is assumed that the reader is familiar with
many of the basic skills and techniques referenced below. In
addition to this guide, Intersil provides complete reference
designs that include schematics, bills of materials, and
example board layouts for all common microprocessor
applications.
MOSFETs
Given the fixed switching frequency of the ISL6563 and the
integrated output drives, the selection of MOSFETs revolves
closely around the current each MOSFET is required to
conduct, the capability of the devices to dissipate heat, as well
as the characteristics of available heat sinking. Since the
ISL6563 drives the MOSFETs with 5V, the selection of
appropriate MOSFETs should be done by comparing and
evaluating their characteristics at this specific V
GS
bias
voltage.
LOWER MOSFET POWER CALCULATION
Since virtually all of the heat loss in the lower MOSFET is
conduction loss (due to current conducted through the
channel resistance, r
DS(ON)
), a quick approximation for heat
dissipated in the lower MOSFET can be found in the
following equation:
where: I
M
is the maximum continuous output current, I
L,PP
is
the peak-to-peak inductor current, and D is the duty cycle
(approximately V
OUT
/V
IN
).
An additional term can be added to the lower-MOSFET loss
equation to account for additional loss accrued during the
dead time when inductor current is flowing through the
T
SS
V
1280
S
---------------------------------
=
FIGURE 7. SOFT-START WAVEFORMS FOR ISL6563-BASED
MULTIPHASE CONVERTER
ENLL (5V/DIV)
V
OUT
(0.5V/DIV)
GND>
T1
GND>
T2
T3
OUTPUT PRECHARGED
BELOW DAC LEVEL
OUTPUT PRECHARGED
ABOVE DAC LEVEL
P
LMOS1
r
DS ON
)
I
-------------
2
1
D
–
(
)
I
,
--------------------------------
2
1
(
D
–
)
+
=
ISL6563
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|---|---|
| ISL6563CR-T | 功能描述:IC CTRLR PWM MULTIPHASE 24-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) |
| ISL6563CR-TK | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6563CRZ | 功能描述:電流型 PWM 控制器 P6 TWO PHS CONT INTEGRTD DRVRS DESKT RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6563CRZ-T | 功能描述:電流型 PWM 控制器 P6 TWO PHS CONT INTEGRTD DRVRS DESKT RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6563CRZ-TK | 功能描述:IC CTRLR PWM MULTIPHASE 24-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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