參數(shù)資料
型號(hào)： ISL6308
廠商： Intersil Corporation
英文描述： Quadruple 2-Input Exclusive-OR Gates 14-SOIC -40 to 85
中文描述： 三相降壓PWM控制器，帶有高電流集成MOSFET驅(qū)動(dòng)器
文件頁(yè)數(shù)： 10/27頁(yè)
文件大?。?/td> 765K
代理商： ISL6308
10
FN9208.2
October 19, 2005
currents from a three-phase converter combining to reduce
the total input ripple current.
The converter depicted in Figure 2 delivers 1.5V to a 36A
load from a 12V input. The RMS input capacitor current is
6.1A. Compare this to a single-phase converter also
stepping down 12V to 1.5V at 36A. The single-phase
converter has a 13.3A RMS input capacitor current. The
single-phase converter must use an input capacitor bank
with twice the RMS current capacity as the equivalent three-
phase converter.
Figures 24, 25 and 26 in the section entitled
Input Capacitor
Selection
can be used to determine the input capacitor RMS
current based on load current, duty cycle, and the number of
channels. They are provided as aids in determining the
optimal input capacitor solution.
PWM Operation
The timing of each converter leg is set by the number of
active channels. The default channel setting for the ISL6308
is three. One switching cycle is defined as the time between
the internal PWM1 pulse termination signals. The pulse
termination signal is the internally generated clock signal
that triggers the falling edge of PWM1. The cycle time of the
pulse termination signal is the inverse of the switching
frequency set by the resistor between the FS pin and
ground. Each cycle begins when the clock signal commands
PWM1 to go low. The PWM1 transition signals the internal
channel 1 MOSFET driver to turn off the channel 1 upper
MOSFET and turn on the channel 1 synchronous MOSFET.
In the default channel configuration, the PWM2 pulse
terminates 1/3 of a cycle after the PWM1 pulse. The PWM3
pulse terminates 1/3 of a cycle after PWM2.
If PVCC3 is left open or connected to ground, two channel
operation is selected and the PWM2 pulse terminates 1/2 of
a cycle after the PWM1 pulse terminates. If both PVCC3 and
PVCC2 are left open or connected to ground, single channel
operation is selected. The 2PH and 3PH inputs can also be
used to accomplish this function. Once a PWM pulse
transitions low, it is held low for a minimum of 1/3 cycle. This
forced off time is required to ensure an accurate current
sample. Current sensing is described in the next section.
After the forced off time expires, the PWM output is enabled.
The PWM output state is driven by the position of the error
amplifier output signal, VCOMP, minus the current correction
signal relative to the sawtooth ramp as illustrated in Figure 3.
When the modified VCOMP voltage crosses the sawtooth
ramp, the PWM output transitions high. The internal
MOSFET driver detects the change in state of the PWM
signal and turns off the synchronous MOSFET and turns on
the upper MOSFET. The PWM signal will remain high until
the pulse termination signal marks the beginning of the next
cycle by triggering the PWM signal low.
Channel Current Balance
One important benefit of multi-phase operation is the thermal
advantage gained by distributing the dissipated heat over
multiple devices and greater area. By doing this the designer
avoids the complexity of driving parallel MOSFETs and the
expense of using expensive heat sinks and exotic magnetic
materials.
In order to realize the thermal advantage, it is important that
each channel in a multi-phase converter be controlled to
carry about the same amount of current at any load level. To
achieve this, the currents through each channel must be
sampled every switching cycle. The sampled currents, I
n
,
from each active channel are summed together and divided
by the number of active channels. The resulting cycle
average current, I
AVG
, provides a measure of the total load
current demand on the converter during each switching
cycle. Channel current balance is achieved by comparing
the sampled current of each channel to the cycle average
current, and making the proper adjustment to each channel
pulse width based on the error. Intersil’s patented current-
balance method is illustrated in Figure 3, with error
correction for channel 1 represented. In the figure, the cycle
average current, I
AVG
, is compared with the channel 1
sample, I
1
, to create an error signal I
ER
.
The filtered error signal modifies the pulse width
commanded by V
COMP
to correct any unbalance and force
I
ER
toward zero. The same method for error signal
correction is applied to each active channel.
FIGURE 2. CHANNEL INPUT CURRENTS AND INPUT-
CAPACITOR RMS CURRENT FOR 3-PHASE
CONVERTER
CHANNEL 1
INPUT CURRENT
CHANNEL 2
INPUT CURRENT
CHANNEL 3
INPUT CURRENT
INPUT-CAPACITOR CURRENT
ISL6308
相關(guān)PDF資料
PDF描述
ISL6308CRZ Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers
ISL6308CRZ-T Quadruple 2-Input Exclusive-OR Gates 14-SOIC -40 to 85
ISL6308IRZ-T Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers
ISL6315 Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers(帶集成MOSFET驅(qū)動(dòng)器的雙相降壓PWM控制器)
ISL6316 Quadruple 2-Input Exclusive-OR Gates 14-SOIC -40 to 85
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6308ACRZ 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)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(lèi)型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
ISL6308ACRZR5609 制造商:Intersil Corporation 功能描述:PB-FREE DAC-LESS MULTI-PHASE PWM CONTR W/3-DRIVERS, HARD WI - Rail/Tube
ISL6308ACRZ-T 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)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(lèi)型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
ISL6308ACRZ-TR5609 制造商:Intersil Corporation 功能描述:PB-FREE DAC-LESS MULTI-PHASE PWM CONTR W/3-DRIVERS, HARD WIR - Tape and Reel
ISL6308AEVAL1Z 功能描述:EVALUATION BOARD FOR ISL6308A RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類(lèi)型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
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