参数资料
型号: ISL6569CR-T
厂商: Intersil
文件页数: 8/22页
文件大小: 0K
描述: IC REG CTRLR DIVIDER PWM 32-QFN
标准包装: 6,000
PWM 型: 控制器
输出数: 1
频率 - 最大: 2MHz
占空比: 75%
电源电压: 4.75 V ~ 5.25 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 32-VFQFN 裸露焊盘
包装: 带卷 (TR)
ISL6569
OFS
x0.1
100 μ A
VIN
L 1
COMP
+
PWM
CIRCUIT
PWM1
-
REFERENCE
&
DAC
+
-
PWM
CIRCUIT
ISEN1
R ISEN1
VIN
C O
V OUT
μ P
LOAD
+
FB
-
ERROR
AMPLIFIER
PWM2
L 2
IOUT
AVERAGE
I OUT
+
-
CURRENT
SENSE
ISEN2
R ISEN2
VDIFF
x1
-
+
+
-
CURRENT
SENSE
VSEN
RGND
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF A ISL6569 CONVERTER
Interleaving
The switching of each channel in a multi-phase converter is
timed to be symmetrically out of phase with the other
channel. In a 2-phase converter, channel-2 switches half a
cycle after channel-1. As a result, the converter has a ripple
frequency twice that of either phase. Figure 2 illustrates the
multiplicative effect on output ripple frequency. The two
channel currents (IL1and IL2), combine to form the AC ripple
current and the DC load current. The ripple component has
twice the ripple frequency of either channel current. Each
PWM pulse is terminated half of a cycle, or 2.0 μ s, after the
PWM pulse of the previous phase. The peak-to-peak current
waveform for each phase is about 7A, and the dc components
of the inductor currents combine to feed the load.
8
IL1 + IL2, 7A/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 2-PHASE CONVERTER
In addition, the peak-to-peak amplitude of the combined
inductor currents is reduced in proportion to the number of
phases. To understand the reduction of ripple current
amplitude in the multi-phase circuit, examine the equation
FN9085.7
December 29, 2004
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