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參數(shù)資料
| 型號： | IRU3038CS |
| 廠商： | International Rectifier |
| 英文描述： | SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| 中文描述： | 同步PWM控制器終止電源應用 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 139K |
| 代理商： | IRU3038CS |
IRU3038
7
Rev. 2.0
09/12/02
www.irf.com
The MOSFET has the following data:
IRF7460
V
DSS
= 20V
I
D
= 10A @ 75
8
C
R
DS(ON)
= 10m
@ V
GS
=10V
= 1.8 for 150
8
C (Junction Temperature)
The total conduction losses will be:
The switching loss is more difficult to calculate, even
though the switching transition is well understood. The
reason is the effect of the parasitic components and
switching times during the switching procedures such
as turn-on / turnoff delays and rise and fall times. With a
linear approximation, the total switching loss can be ex-
pressed as:
r
+
t
f
T
2
Where:
V
DS(OFF)
= Drain to Source Voltage at off time
t
r
= Rise Time
t
f
= Fall Time
T = Switching Period
I
LOAD
= Load Current
The switching time waveform is shown in Figure 4.
Figure 4 - Switching time waveforms.
From IRF7460 data sheet we obtain:
t
r
= 6.9ns
t
f
= 4.3ns
These values are taken under a certain condition test.
For more detail please refer to the IRF7460 data sheet.
By using equation (6), we can calculate the total switch-
ing losses.
P
SW(TOTAL)
= 44.8mW
Feedback Compensation
The IRU3038 is a voltage mode controller; the control
loop is a single voltage feedback path including error
amplifier and error comparator. To achieve fast transient
response and accurate output regulation, a compensa-
tion circuit is necessary. The goal of the compensation
network is to provide a closed loop transfer function with
the highest 0dB crossing frequency and adequate phase
margin (greater than 45
8
).
The output LC filter introduces a double pole, –40dB/
decade gain slope above its corner resonant frequency,
and a total phase lag of 180
8
(see Figure 5). The Reso-
nant frequency of the LC filter is expressed as follows:
Figure 5 shows gain and phase of the LC filter. Since we
already have 180
8
phase shift just from the output filter,
the system risks being unstable.
Figure 5 - Gain and phase of LC filter.
The IRU3038’s error amplifier is a differential-input
transconductance amplifier. The output is available for
DC gain control or AC phase compensation.
The E/A can be compensated with or without the use of
local feedback. When operated without local feedback,
the transconductance properties of the E/A become evi-
dent and can be used to cancel one of the output filter
poles. This will be accomplished with a series RC circuit
from Comp pin to ground as shown in Figure 6.
P
CON(TOTAL)
= 1.152W
F
LC
= 1
2
π×
L
O
×
C
O
P
SW
= V
×
I
LOAD
---(6)
DS(OFF)
V
DS
90%
V
GS
10%
t
d
(ON)
t
d
(OFF)
t
r
t
f
Gain
F
LC
0dB
Phase
0
8
F
LC
-180
8
Frequency
Frequency
-40dB/decade
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