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IRS254(0,1)(S)PbF
from the output needs to be implemented, as seen in
1000
0uF
4.7uF
Fig. 16.
10uF
22uF
33uF
47uF
100
10
30
50
70
90
110
130
150
170
Vin (V)
Fig. 13 I out = 350 mA, V out = 16.8 V, L = 470 μ H
400
350
300
250
200
40V
100V
Fig. 15 I out = 350 mA, V in = 100 V, V out = 16.85 V, L = 470 μ H,
C out = 33 μ F
150
100
50
160V
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
0
0
10
20 30
Capacitance (uF)
40
50
resistor, a current will flow to charge the V CC
capacitor. Once the capacitor is charged up to the
Fig. 14 I out = 350 mA, V out = 16.8 V, L = 470 μ H
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
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 out ? 15 . 6 V
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
RS 2 =
10 mA
P RS 2 = ( 10 mA ) 2 RS 2 ≤
Icc ≈ 10 mA
P RS 2 _ Rated
2
trend in the current, but all sharp corners will be
rounded with all peaks significantly reduced, as can
be seen in Fig. 15
VBUS
VCC Supply
VCC
1
8
VB
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
ENN
COM
IFB
ENN
2
3
4
7
6
5
HO
VS
LO
applications an alternate V CC supply scheme utilizing
the micro-power start-up and a resistor feed-back
COM
Fig. 16 Alternate Supply Diagram
www.irf.com
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