参数资料
型号: ISL6565BCVZ
厂商: Intersil
文件页数: 15/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 28TSSOP
标准包装: 500
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.5MHz
占空比: 66.7%
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 ~ 105°C
封装/外壳: 28-TSSOP(0.173",4.40mm 宽)
包装: 管件
ISL6565A, ISL6565B
As shown in Figure 7, a current proportional to the average
VDIFF
current in all active channels, I AVG , flows from FB through a
load-line regulation resistor, R FB . The resulting voltage drop
across R FB is proportional to the output current, effectively
creating an output voltage droop with a steady-state value
defined as:
V DROOP = I AVG R FB
(EQ. 10)
+
V OFS
-
R FB
FB
I OFS
VREF
E/A
In most cases, each channel uses the same component
values to sense current. If this is the case you can derive a
more complete equation for V DROOP for each current sense
method being used.
V DROOP = ------------- ---------------------- R FB
R ISEN
V DROOP = ------------- ? K ? ------------------ R FB
R ISEN
I OUT r DS ( ON )
N
I OUT DCR
N
r DS(ON) SENSING
(ISL6565A ONLY)
DCR SENSING
(ISL6565B ONLY)
(EQ. 11)
(EQ. 12)
R OFS
OFS
GND
ISL6565A, ISL6565B
+
-
GND
0.5V
-
2.0V
+
VCC
Output-Voltage Offset Programming
The ISL6565A, ISL6565B allows the designer to accurately
FIGURE 8. POSITIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
adjust the offset voltage by connecting a resistor, R OFS ,
from the OFS pin to VCC or GND. When R OFS is connected
between OFS and VCC, the voltage across it is regulated to
2.0V. This causes a proportional current (I OFS ) to flow into
the OFS pin and out of the FB pin. If R OFS is connected to
ground, the voltage across it is regulated to 0.5V, and I OFS
flows into the FB pin and out of the OFS pin. The offset
current flowing through the resistor between VDIFF and FB
VDIFF
-
V OFS R FB
+
I OFS
FB
VREF
E/A
will generate the desired offset voltage which is equal to the
product (I OFS x R FB ). These functions are shown in Figures
8 and 9.
Once the desired output offset voltage has been determined,
VCC
use the following formulas to set R OFS :
For Positive Offset (connect R OFS to GND):
R OFS
+
-
+
2.0V
0.5 × R FB
V OFFSET
R OFS = --------------------------
(EQ. 13)
OFS
ISL6565A, ISL6565B
-
GND
0.5V
VCC
For Negative Offset (connect R OFS to VCC):
FIGURE 9. NEGATIVE OFFSET OUTPUT VOLTAGE
2 × R FB
V OFFSET
R OFS = --------------------------
15
(EQ. 14)
PROGRAMMING
Dynamic VID
Modern microprocessors need to make changes to their core
voltage as part of normal operation. They direct the core-
voltage regulator to do this by making changes to the VID
inputs. The core-voltage regulator is required to monitor the
DAC inputs and respond to on-the-fly VID changes in a
controlled manner supervising a safe output voltage transition
without discontinuity or disruption.
FN9135.4
December 1, 2005
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