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| 型号： | ISL6322GIRZ |
| 厂商： | Intersil |
| 文件页数： | 13/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 48-QFN |
| 标准包装： | 43 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.99 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 管件 |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
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ISL6322G
? ------------- + 1 ?
( R 1 ? R 2 )
V C ( s ) = -------------------------------------------------------- ? K ? DCR ? I L
.
MOSFET
UGATE(n)
V IN
L
I
L
DCR
V OUT
s ? L
? DCR ?
? ?
? s ? ------------------------ ? C + 1 ?
? R 1 + R 2 ?
(EQ. 5)
R 2
DRIVER
LGATE(n)
INDUCTOR
V L (s)
V C (s)
C OUT
K = ---------------------
R 2 + R 1
(EQ. 6)
ISL6322G INTERNAL CIRCUIT
I SEN(n)
SAMPLE
R 1
C
R 2*
If the R-C network components are selected such that the
RC time constant matches the inductor L/DCR time
constant, then V C is equal to the voltage drop across the
DCR multiplied by the ratio of the resistor divider, K. If a
resistor divider is not being used, the value for K is 1 .
The capacitor voltage V C , is then replicated across the
sense resistor R ISEN . The current through R ISEN is
proportional to the inductor current. Equation 7 shows that
the proportion between the channel-current and the sensed
+
-
V C (s)
ISEN-(n)
current (I SEN ) is driven by the value of the sense resistor,
the resistor divider ratio, and the DCR of the inductor.
I SEN = K ? I L ? ------------------
I SEN(n)
R ISEN
ISEN+(n)
*R 2 is OPTIONAL
DCR
R ISEN
(EQ. 7)
FIGURE 5. INDUCTOR DCR CURRENT SENSING
CONFIGURATION
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 5. The channel-current
I L , flowing through the inductor, passes through the DCR.
Equation 3 shows the S-domain equivalent voltage, V L ,
across the inductor.
Output Voltage Setting
The ISL6322G 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 logic signals into one of
the discrete voltages shown in Tables 2, 3, 4 and 5. In Intel
modes of operation, each VID pin is pulled up to an internal
1.2V voltage by a weak current source (40μA), which
decreases to 0A as the voltage at the VID pin varies from 0
to the internal 1.2V pull-up voltage. In AMD modes of
operation the VID pins are pulled low by a weak 20μA
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 3)
current source. External pull-up resistors or active-high
output stages can augment the pull-up current sources, up to
A simple R-C network across the inductor (R 1 and C)
extracts the DCR voltage, as shown in Figure 5. The voltage
across the sense capacitor, V C , can be shown to be
proportional to the channel-current I L , shown in Equation 4.
a voltage of 5V.
The ISL6322G accommodates four different DAC ranges:
Intel VR10 (Extended), Intel VR11, AMD K8/K9 5-bit, and
AMD 6-bit. The state of the VRSEL and VID7 pins decide
? ------------- + 1 ?
V C ( s ) = -------------------------------------- ? DCR ? I L
s ? L
? DCR ?
( s ? R 1 ? C + 1 )
(EQ. 4)
which DAC version is active. Refer to Table 1 for a
description of how to select the desired DAC version.
TABLE 1. ISL6322G DAC SELECT TABLE
DAC VERSION
VRSEL PIN
VID7 PIN
In some cases it may be necessary to use a resistor divider
R-C network to sense the current through the inductor. This
can be accomplished by placing a second resistor, R 2 ,
across the sense capacitor. In these cases the voltage
across the sense capacitor, V C , becomes proportional to the
channel-current I L , and the resistor divider ratio, K.
VR10(Extended)
VR11
AMD 5-bit
AMD 6-bit
VRSEL < 0.6V
0.8V < VRSEL < 3.0V
3.0V < VRSEL < VCC
3.0V < VRSEL < VCC
-
-
Low
High
TABLE 2. VR10 (EXTENDED) VOLTAGE IDENTIFICATION
CODES
VID4
0
0
VID3
1
1
VID2
0
0
VID1
1
1
VID0
0
0
VID5
1
1
VID6
1
0
VDAC
1.60000
1.59375
13
FN6715.0
May 22, 2008
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