- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383145 > ISL6315 (Intersil Corporation) 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) PDF資料下載
參數(shù)資料
| 型號(hào)： | ISL6315 |
| 廠商： | Intersil Corporation |
| 英文描述： | 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) |
| 中文描述： | 兩相多相降壓PWM控制器，具有集成MOSFET驅(qū)動(dòng)器（帶集成MOSFET的驅(qū)動(dòng)器的雙相降壓的PWM控制器） |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 394K |
| 代理商： | ISL6315 |
8
FN9222.1
July 18, 2007
INTERLEAVING
The switching of each channel in a ISL6315-based converter
is timed to be symmetrically out of phase with the other
channel. As a result, the two-phase converter has a
combined ripple frequency twice the frequency of one of its
phases. In addition, the peak-to-peak amplitude of the
combined inductor currents is proportionately reduced.
Increased ripple frequency and lower ripple amplitude
generally translate to lower per-channel inductance and
lower total output capacitance for a given set of performance
specifications.
Figure 2 illustrates the additive effect on output ripple
frequency. The two channel currents (I
L1
and I
L2
), combine
to form the AC ripple current and the DC load current. The
ripple component has two times the ripple frequency of each
individual channel current.
To understand the reduction of ripple current amplitude in the
multiphase circuit, examine the equation representing an
individual channel’s peak-to-peak inductor current.
V
IN
and V
OUT
are the input and output voltages,
respectively, L is the single-channel inductor value, and f
S
is
the switching frequency.
The output capacitors conduct the ripple component of the
inductor current. In the case of multiphase converters, the
capacitor current is the sum of the ripple currents from each
of the individual channels. Peak-to-peak ripple current, I
P-P
,
decreases by an amount proportional to the number of
channels. Output-voltage ripple is a function of capacitance,
capacitor equivalent series resistance (ESR), and inductor
ripple current. Reducing the inductor ripple current allows
the designer to use fewer or less costly output capacitors
(should output ripple be an important design parameter).
Another benefit of interleaving is the reduction of input ripple
current. Input capacitance is determined in a large part by
the maximum input ripple current. Multiphase topologies can
improve overall system cost and size by lowering input ripple
current and allowing the designer to reduce the cost of input
capacitance. The example in Figure 3 illustrates input
currents from a two-phase converter combining to reduce
the total input ripple current.
Figure 12, part of the section entitled
“Input Capacitor
Selection” on page 18,
can be used to determine the input-
capacitor RMS current based on load current and duty cycle.
The figure is provided as an aid in determining the optimal
input capacitor solution.
PWM OPERATION
One switching cycle for the ISL6315 is defined as the time
between consecutive PWM pulse terminations (turn-off of
the upper MOSFET on a channel). Each cycle begins when
a switching clock signal commands the upper MOSFET to
go off. The other channel’s upper MOSFET conduction is
terminated 1/2 of a cycle later.
Once a channel’s upper MOSFET is turned off, the lower
MOSFET remains on for a minimum of 1/3 cycle. This forced
off time is required to assure an accurate current sample.
Following the 1/3-cycle forced off time, the controller enables
the upper MOSFET output. Once enabled, the upper
MOSFET output transitions high when the sawtooth signal
crosses the adjusted error-amplifier output signal, as
FIGURE 2. PWM AND INDUCTOR-CURRENT WAVEFORMS
FOR 2-PHASE CONVERTER
PWM2
PWM1
I
L2
I
L1
I
L1
+ I
L2
I
L P-P
,
V
---------------------------------------------------------
V
S
–
(
)
V
IN
=
(EQ. 4)
I
P-P
V
-------------------------------------------------------------------
N
S
V
–
(
)
V
IN
=
(EQ. 5)
FIGURE 3. INPUT CAPACITOR CURRENT AND INDIVIDUAL
CHANNEL CURRENTS IN A 2-PHASE
CONVERTER
Q1 D-S CURRENT
Q3 D-S CURRENT
C
IN
CURRENT
ISL6315
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6316 | Quadruple 2-Input Exclusive-OR Gates 14-SOIC -40 to 85 |
| ISL6316IRZ | MINIATURE TOGGLE SWITCH |
| ISL6316CRZ | Enhanced 4-Phase PWM Controller with 6-Bit VID Code Capable of Precision RDS(ON) or DCR Differential Current Sensing for VR10 Application |
| ISL6316CRZ-T | Quadruple 2-Input Exclusive-OR Gates 14-PDIP -40 to 85 |
| ISL6316IRZ-T | Quadruple 2-Input Exclusive-OR Gates 14-PDIP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6315CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6315CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6315CRZ-TK | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6315IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6315IRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。