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參數(shù)資料
| 型號： | IRU3055 |
| 廠商： | International Rectifier |
| 英文描述： | 5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC |
| 中文描述： | 5位可編程3相位同步降壓控制器IC |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 352K |
| 代理商： | IRU3055 |
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20
Rev. 1.4
08/13/02
IRU3055
www.irf.com
Introduction to Intel Specification
Figure 21 - The Intel specification for the load line.
According to the Intel spec, the output voltage is depen-
dent on the load current. When the current goes up, the
voltage goes down. The characteristic can be modeled
by the following:
Where V
OFFSET
is the offset voltage and K
LOAD
is the
slope of load line.
Rearrangement results in:
For Intel spec:
V
OFFSET
= 25mV
K
LOAD
= 98mV/45A = 2.18m
Implementation of Voltage Droop with IRU3055
With a single single-ended OPAMP, the IRU3055 can
achieve voltage droop function as shown in Figure 22.
The voltage Vc is a constant voltage such as 2V or 5V.
The signal Vo+Rs
×
Io can be from inductor current sens-
ing. The real application circuit is shown in Figure 20.
Figure 22 - Implement voltage droop
with a single OPAMP.
V
SET
Vo
Io
V
OFFSET
V
O(MAX)
V
O(MIN)
V
O(TYP)
With this simple circuit, the output voltage will linearly
decrease as load current increases. The output voltage
will fall in Intel spec. The resistor ratio “c” will determine
the slope of the voltage-current load line. The resistor
ratios “d” and “e” determine the offset voltage.
In an ideal case, these parameters can be calculated
by:
c =
K
LOAD
- Rs
K
V
OFFSET
Vc
V
OFFSET
Where Rs is equivalent current sensing resistors.
For a 3-phase converter with inductor current sensing:
Rs =R
L
3
Where R
L
is the DC resistance of the inductor.
In practice, the resistor ratios “c” and “d” have to be tuned
in order to take some parasitic parameters such as PCB
layout trace into account.
Component selection guide
The implementation circuit is shown in Fig.20, Resistor
R7, R8, R9 and capacitor C15 configures a inductor cur-
rent losses sensing network to sense the load current.
(Attn: The C15 and R11 must connect directly to the
output terminal.) The RC networks that sense the induc-
tor current have to satisfy the following:
(R/3)
×
C = L/R
L
For example, in the application circuit in Figure 20, the
inductor is 1
μ
H and the DC resistance is 1.6m
. If the
filter capacitor C15 is chosen to be 1
μ
F, then the cur-
rent sensing resistors R7, R8 and R9 are:
Because the given inductor is larger at zero current (it is
1.3
μ
H at 0 current). A large resistor has to be taken.
In the application circuit in Figure 20, R7,R8 and R9=2.2K.
Select R17 (referring to R2 in Figure 22) to be 1M
if we
consider the input bias of OPAMP LM324. Select R10
(referring to R1 in Figure 22) to be 1K
.
Connect the voltage Vc to 2V reference voltage shown in
Figure 20.
Vc=2V
R = 3
×
L/R
L
/C
R = 3
×
1
μ
H/1.6m
/1
μ
F = 1.87K
Rs
d = Rs
×
Vc
e =
V
SET
= Vo + V
OFFSET
+ K
LOAD
×
Io ---(11)
Vo = V
SET
- V
OFFSET
- K
LOAD
×
Io ---(10)
R10=1K and R17=1M
Vo
Vo+(Rs x Io)
c x R1
R1
V
FB
V
SET
IRU3055
R2/d
Vc
(constant voltage)
e x R1
R2
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