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參數(shù)資料
| 型號(hào)： | IRS2541STRPbF |
| 廠商： | International Rectifier |
| 英文描述： | LED BUCK REGULATOR CONTROL IC |
| 中文描述： | 發(fā)光二極管降壓穩(wěn)壓器控制IC |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 456K |
| 代理商： | IRS2541STRPBF |
IRS254(0,1)(S)PbF
www.irf.com Page 11
10
100
1000
30
50
70
90
110
130
150
170
Vin (V)
F
0uF
4.7uF
10uF
22uF
33uF
47uF
Fig. 13 I
out
= 350 mA, V
out
= 16.8 V, L = 470 μH
0
50
100
150
200
250
300
350
400
0
10
20
30
40
50
Capacitance (uF)
F
40V
100V
160V
Fig. 14 I
out
= 350 mA, V
out
= 16.8 V, L = 470 μH
The addition of the C
OUT
increases the amount of
energy that can be stored in the output stage, which
also means it can supply current for an increased
period of time. Therefore by slowing down the di/dt
transients in the load, the frequency is effectively
decreased.
With the C
OUT
capacitor, the inductor current is no
longer identical to that seen in the load. The
inductor current will still have a perfectly triangular
shape, where as the load will see the same basic
trend in the current, but all sharp corners will be
rounded with all peaks significantly reduced, as can
be seen in Fig. 15
VCC Supply
Since the IRS245(0,1) is rated for 200 V (or 600 V),
V
BUS
can reach values of this magnitude. If only a
supply resistor to V
BUS
is used, it will experience
extremely high power losses. For higher voltage
applications an alternate V
CC
supply scheme utilizing
the micro-power start-up and a resistor feed-back
from the output needs to be implemented, as seen in
Fig. 16.
Fig. 15 I
out
= 350 mA, V
in
= 100 V, V
out
= 16.85 V, L = 470 μH,
C
out
= 33 μF
The resistance between V
BUS
and V
CC
supply should
be large enough to minimize the current sourced
directly from the input voltage line; value should be
on the order of hundreds of k
. Through the supply
resistor, a current will flow to charge the V
CC
capacitor. Once the capacitor is charged up to the
V
CCUV+
threshold, the IRS254(0,1) enters the micro
start-up regime and begins to operate, activating the
LO and HO outputs. After the first few cycles of
switching, the resistor connected between the output
and V
CC
will take over and source all necessary
current for the IC. The resistor connecting the
output to the supply should be carefully designed
according to its power rating.
V
V
RS
10
mA
Icc
P
RS
mA
P
mA
Rated
RS
RS
out
10
2
2
)
10
(
6
15
2
_
2
2
2
≈
≤
=
=
Fig. 16 Alternate Supply Diagram
1
2
3
4
8
7
6
5
I
(
VCC
ENN
IFB
LO
VS
HO
VB
COM
VBUS
COM
ENN
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