參數(shù)資料
型號(hào)： ISL6557
廠商： Intersil Corporation
英文描述： PWM Controller with Wide Input Voltage Range 8-SOIC -20 to 85
中文描述： 多相PWM控制器為核心電壓調(diào)節(jié)
文件頁數(shù)： 6/17頁
文件大?。?/td> 532K
代理商： ISL6557
6
Operation
Multi-Phase Power Conversion
Multi-phase power conversion provides the most cost-
effective power solution when load currents are no longer
easily supported by single-phase converters. Although its
greater complexity presents additional technical challenges,
the multi-phase approach offers cost-saving advantages
with improved response time, superior ripple cancellation,
and excellent thermal distribution.
INTERLEAVING
The switching of each channel in a multi-phase converter is
timed to be symmetrically out of phase with each of the other
channels. In a 4-phase converter, each channel switches 1/4
cycle after the previous channel and 1/4 cycle before the
following channel. As a result, the four-phase converter has
a combined ripple frequency four times greater than the
ripple frequency of any one phase. In addition, the peak-to-
peak amplitude of the combined inductor currents is reduced
in proportion to the number of phases (Equations 1 and 2).
Increased ripple frequency and lower ripple amplitude mean
that the designer can use less per-channel inductance and
lower total output capacitance for any performance
specification.
R
ISEN1
ERROR
AMPLIFIER
FB
ISEN1
V
OUT
PWM1
H
+
-
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6557 IN A 3-PHASE CONVERTER
I
OUT
μ
P
LOAD
C
O
x 1
+
-
VSEN
RGND
VDIFF
DAC
&
REFERENCE
COMP
VIN
R
ISEN2
ISEN2
PWM2
H
R
ISEN3
ISEN3
PWM3
H
VIN
VIN
L
1
L
2
L
3
+
PWM
CIRCUIT
CURRENT
SENSE
AVERAGE
+
+
-
-
-
+
-
-
+
+
-
CURRENT
SENSE
CURRENT
SENSE
PWM
CIRCUIT
PWM
CIRCUIT
FIGURE 2. PWM AND INDUCTOR-CURRENT WAVEFORMS
FOR 3-PHASE CONVERTER
1
μ
s/DIV
PWM2, 5V/DIV
PWM1, 5V/DIV
IL2, 7A/DIV
IL1, 7A/DIV
IL1 + IL2 + IL3, 7A/DIV
IL3, 7A/DIV
PWM3, 5V/DIV
ISL6557
相關(guān)PDF資料
PDF描述
ISL6557CB PWM Controller with Wide Input Voltage Range 8-PDIP -20 to 85
ISL6558CRZA-T Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning
ISL6558IB Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning
ISL6558IB-T Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning
ISL6558IBZ Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6557 WAF 制造商:Intersil Corporation 功能描述:
ISL6557ACB 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6557ACB-T 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6557ACBZ 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC 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)
ISL6557ACBZ-T 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC 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)
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