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參數(shù)資料
| 型號(hào)： | IRU3072C |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER |
| 中文描述： | 20引腳同步PWM控制器/ 3 LDO控制器 |
| 文件頁(yè)數(shù)： | 17/24頁(yè) |
| 文件大?。?/td> | 332K |
| 代理商： | IRU3072C |
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IRU3072
17
Rev. 1.0
3/25/04
www.irf.com
I
O(LIM)
= 10A
I
PK_PK
= (12-1.2)
×
1.2/(1
μ
H
×
400KHz
×
12)
I
PK_PK
2.7A
I
SET
= I
O(LIM)
-
I
PK_PK
/2 = 10A-2.7A/2
8.7A
R
SET
= I
SET
×
R
DS(ON)
/20
μ
A
R
SET
= 8.7A
×
14m
/20
μ
A = 6.09K
Select R7=R
SET
=6.8K
F
O
= 40KHz
http://www.irf.com/technical-info/appnotes.htm
T
J
= T
A
+P
D
×
R
θ
JA
= 35+2
×
50 = 135
8
C < 150
8
C
C
SS
= 20
μ
A
×
t
START
= 20
μ
A
×
5ms = 0.1
μ
F
Select C11=C
SS
=0.1
μ
F
T
J
= T
A
+P
D
×
R
θ
JA
= 35+0.81
×
50 = 76
8
C < 150
8
C
Rc1=2
π×
F
O
×
L
×
V
OSC
×
V
OUT
(ESR
×
V
IN
×
g
m
×
V
REF
)
Cc1 = (L
×
C
OUT
)/0.75/Rc1
Cc1 = (1
μ
H
×
450
μ
F)/0.75/3.3K = 10nF
Select C9=Cc1=15nF
For low side MOSFET IRF7460, with 4.5V gate volt-
age and maximum R
DS(ON)
of 14m
, then:
(4) Compensation Design
Figure 25 - Type II compensator.
For electrolytic capacitor, the frequency caused by
ESR is typically at a few KHz range. A type II com-
pensator is a good option. The detailed description
is shown in application note AN-1043 from:
Select the zero crossover frequency to be 1/10 of
switching frequency that is 40KHz:
The compensation resistor can be calculated as:
Where V
OSC
is the oscillator peak to peak voltage
and gm is the transconductance of the error ampli-
fier. From the datasheet we get V
OSC
=1.25V and
g
m
=1000
μ
mho. The calculated compensation resis-
tor is:
The compensator capacitor is given as:
Rc1=2
π×
40
×
1
×
1.25
×
1.2/(13
×
12
×
1000
×
0.8)
Rc1=2.98K
Select R8=Rc1=3.3K
g
m
Rf1
Rf2
V
OUT
V
FB
1V
Comp
Cc1
Rc1
Cc2
(Optional)
IRU3072
Error Amp
T
J
= T
A
+P
D
×
R
θ
JA
Where:
T
J
is
the junction temperature.
T
A
is the ambient temperature.
P
D
is the power dissipation.
R
θ
JA
is the junction-to-ambient thermal resistance
with MOSFET on 1" square PCB board and is from
the data sheet.
For MOSFET IRF7460 with SOIC 8-pin package,
R
θ
JA
=50
8
C/W. Assume ambient temperature is T
A
=35
8
C.
For high side MOSFET, the junction temperature is given
as:
Estimated Temperature Rise for MOSFET
The estimated junction temperature of the MOSFET is
given by:
For low side MOSFET IRF7460, the maximum junction
temperature can be calculated as:
The maximum junction temperature of both MOSFETs
is below the maximum rating of 150
8
C.
Controller Parameter Calculation
(1) Frequency Selection
From Figure 23, the frequency setting resistor can
be chosen to be Rt=47K
, which gives us approxi-
mately 400KHz frequency.
(2) Soft-Start Capacitor
Soft-start capacitor for PWM secton is selected from
equation (1). Select start up time t
START
=5ms:
(3) Over Current Limit Setting
The over current limit resistor can be calculated based
on Figure 17. The output current limit is set by:
The current ripple during nomral operation (400KHz)
is given by:
The over current setting I
SET
is:
The over current setting resistor:
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