參數(shù)資料
型號： ISL6566A
廠商： Intersil Corporation
英文描述： Three-Phase Buck PWM Controller with Two Integrated MOSFET Drivers and One External Driver Signal
中文描述： 三相降壓PWM控制器，帶有兩個集成MOSFET驅(qū)動器和一個外部驅(qū)動器的信號
文件頁數(shù)： 11/28頁
文件大?。?/td> 784K
代理商： ISL6566A
11
FN9200.2
July 27, 2005
The ISL6566A senses the channel load current by sampling
the voltage across the lower MOSFET r
DS(ON)
, as shown in
Figure 5. A ground-referenced operational amplifier, internal
to the ISL6566A, is connected to the PHASE node through a
resistor, R
ISEN
. The voltage across R
ISEN
is equivalent to
the voltage drop across the r
DS(ON)
of the lower MOSFET
while it is conducting. The resulting current into the ISEN pin
is proportional to the channel current, I
L
. The ISEN current is
sampled and held as described in the
Current Sampling
section. From Figure 5, the following equation for I
n
is
derived where I
L
is the channel current.
r
)
ISEN
Output Voltage Setting
The ISL6566A uses a digital to analog converter (DAC) to
generate a reference voltage based on the logic signals at the
VID pins. The DAC decodes the 5 or 6-bit logic signals into
one of the discrete voltages shown in Tables 2, 3, and 4.
Each VID pin is pulled up to an internal 1.2V voltage by a
weak current source (40
μ
A current), which decreases to 0 as
the voltage at the VID pin varies from 0 to the internal 1.2V
pull-up voltage. External pull-up resistors or active-high
output stages can augment the pull-up current sources, up to
a voltage of 5V.
.
The ISL6566A accommodates three different DAC ranges:
Intel VRM9.0, AMD Hammer, or Intel VRM10.0. The state of
the VRM10 and VID12.5 pins decide which DAC version is
active. Refer to Table 1 for a description of how to select the
desired DAC version.
TABLE 1. ISL6566A DAC SELECT TABLE
DAC VERSION
VRM10 PIN
VID12.5 PIN
VRM10.0
High
-
VRM9.0
Low
High
AMD HAMMER
Low
Low
FIGURE 5. ISL6566A INTERNAL AND EXTERNAL CURRENT-
SENSING CIRCUITRY FOR CURRENT BALANCE
I
n
ISEN
IL
(
)
rRISEN
=
-
+
ISEN(n)
R
ISEN
SAMPLE
&
HOLD
ISL6565A INTERNAL CIRCUIT
EXTERNAL CIRCUIT
V
IN
CHANNEL N
UPPER MOSFET
CHANNEL N
LOWER MOSFET
-
+
ILrDS ON
(
)
I
L
I
n
I
L
-R
=
(EQ. 3)
TABLE 2. AMD HAMMER VOLTAGE IDENTIFICATION CODES
VID4
VID3
VID2
VID1
VID0
VDAC
1
1
1
1
1
Off
1
1
1
1
0
0.800
1
1
1
0
1
0.825
1
1
1
0
0
0.850
1
1
0
1
1
0.875
1
1
0
1
0
0.900
1
1
0
0
1
0.925
1
1
0
0
0
0.950
1
0
1
1
1
0.975
1
0
1
1
0
1.000
1
0
1
0
1
1.025
1
0
1
0
0
1.050
1
0
0
1
1
1.075
1
0
0
1
0
1.100
1
0
0
0
1
1.125
1
0
0
0
0
1.150
0
1
1
1
1
1.175
0
1
1
1
0
1.200
0
1
1
0
1
1.225
0
1
1
0
0
1.250
0
1
0
1
1
1.275
0
1
0
1
0
1.300
0
1
0
0
1
1.325
0
1
0
0
0
1.350
0
0
1
1
1
1.375
0
0
1
1
0
1.400
0
0
1
0
1
1.425
0
0
1
0
0
1.450
0
0
0
1
1
1.475
0
0
0
1
0
1.500
0
0
0
0
1
1.525
0
0
0
0
0
1.550
TABLE 3. VRM9 VOLTAGE IDENTIFICATION CODES
VID4
VID3
VID2
VID1
VID0
VDAC
1
1
1
1
1
Off
1
1
1
1
0
1.100
1
1
1
0
1
1.125
1
1
1
0
0
1.150
1
1
0
1
1
1.175
ISL6566A
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