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IRU3065(PbF)
Power Limit Mode
When the output current continuous increases, the
switching period continuous decreases until the induc-
tor current goes into the boundary of discontinuous and
continuous mode as shown in Figure 21. Then the
IRU3065 controlled buck boost converter goes into power
limit mode. In this mode, the output power is limited.
The output voltage is no longer regulated. The output
voltage decreases when the load current increases as
shown in Figure 19. In this mode, the shaded inductor
current in Figure 18 keeps same. The turn off time pe-
Influence of System Parameters
From above section, there is a critical output current
I OCP . When the output current is larger than I OCP , the
output voltage is out of the regulation and switching fre-
quency starts to decreases. When output current equals
I OCP , the frequency reaches its maximum f S(MAX) . Analy-
sis shows that the current I OCP and maximum frequency
f S(MAX) strongly depends on the parameters such as cur-
rent sensing resistor R S and inductance L as well as the
input and output voltage.
riod is dependent on the output voltage. When the out-
put current increases, the output voltage decreases and
it takes more time for the inductor current to reset from
peak current to zero. Therefore, the turn off period in-
creases. Overall the switching frequency decreases
when load current increases as shown in Figure 20.
V out I out , 0.1 . ?
V out I out , 0.11 . ?
V out I out , 0.12 . ?
5
6
5
4
3
2
1
Vgate
0.452
0
0
0.02
0.1
0.2
0.3
I out
0.4
0.5
0.6
0.7
0.7
Figure 22 - Theoretical output voltage versus output
current with different current sensing resistor R S.
1.5 . 10
1.3 . 10
1.2 . 10
Vin
Voltage across
6
6
6
9 . 10
6 . 10
3 . 10
the inductor
V out ? V D
f s I out , 1 . μ H
f s I out , 1.1 . μ H
f s I out , 1.2 . μ H
5
5
5
Inductor
I peak
4.583 . 10 4
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
current
0.02
I out
0.7
? V ref
Output of current
comparator
Output diode
current I out
R 3
R 2
? V out
t on
t 1
Figure 23 - Theoretical operation switching frequency
versus output current with different inductance L.
Figure 22 shows the calculated output voltage versus
output current with different current sensing resistor R S .
With different R S , the critical current IOCP varies, and
the power process ability changes. Figure 23 shows
the calculated operation switching frequency versus
output current with different inductance L when R S =0.1 ? .
The inductance L determines the maximum switching
frequency of the buck boost converter.
T s
Figure 21 - Operation waveforms of IRU3065 con-
trolled buck boost converter at power limit mode.
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