参数资料
| 型号： | ISL6557ACB-T |
| 厂商： | Intersil |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-SOIC |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 75% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
ISL6557A
VIN
COMP
L 1
FB
ERROR
AMPLIFIER
-
+
+
+
-
PWM
CIRCUIT
PWM
CIRCUIT
PWM1
ISEN1
DAC
&
REFERENCE
+
-
PWM
CIRCUIT
R ISEN1
VIN
L 2
-
AVERAGE
PWM2
V OUT
I OUT
ISEN2
R ISEN2
C O
μ P
LOAD
+
CURRENT
VIN
+
-
-
SENSE
CURRENT
SENSE
PWM3
L 3
VDIFF
x1
+
-
+
-
CURRENT
SENSE
ISEN3
R ISEN3
RGND
VSEN
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6557A IN A 3-PHASE CONVERTER
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
6
that the designer can use less per-channel inductance and
lower total output capacitance for any performance
specification.
IL1 + IL2 + IL3, 7A/DIV
IL3, 7A/DIV
PWM3, 5V/DIV
IL2, 7A/DIV
PWM2, 5V/DIV
IL1, 7A/DIV
PWM1, 5V/DIV
1 μ s/DIV
FIGURE 2. PWM AND INDUCTOR-CURRENT WAVEFORMS
FOR 3-PHASE CONVERTER
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6558IR-T | IC REG CTRLR BUCK PWM 20-QFN |
| ISL6559CBZ-T | IC REG CTRLR BUCK PWM VM 28-SOIC |
| ISL6561CR-T | IC CTRLR PWM MULTIPHASE 40-QFN |
| ISL6563IR-T | IC CTRLR PWM MULTIPHASE 24-QFN |
| ISL6564AIRZ | IC REG CTRLR BUCK PWM VM 40-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6557ACBZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6557ACBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6557CB | 制造商:Intersil Corporation 功能描述: |
| ISL6557CB-T | 制造商:Intersil Corporation 功能描述: |
| ISL6557CB-T WAF | 制造商:Intersil Corporation 功能描述: |
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