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IRU3065(PbF)
When I OUT =I OCP , the output voltage equals nominal volt-
age V OUT =V OUT(NOM) . From equation (15),we have
VI SEN
R S
I OCP =
1
2
×
×
V IN
V IN - V OUT +V D
---(17)
Vout versus output current
The above equation is used to select the current sens-
ing resistor R S .
Substitution of equation (16) into equation (13) results
in the relationship between frequency and output cur-
rent, that is
6
5
4
3
2
1
0
)
f S =
V IN
L × I PEAK
× ( 1-
2 × I OUT
I PEAK
--(18)
0
0.2
0.4
Output current (A)
0.6
0.8
The above equation indicates that the switching fre-
quency decreases when output current increases dur-
Predicted (-Vout)
Measured -Vout
V IN × (V D - V OUT(NOM) )
(V IN + V D -
V IN × (V D - V OUT(NOM) ) × R S
VI SEN × (V IN + V D -
ing power limit mode.
When I OUT =I OCP , the switching frequency reaches its
maximum. Substitution of V OUT =V OUT(NOM) and equation
(6) into equation (13) results in the maximum switching
frequency:
f S(MAX) =
V OUT(NOM) ) × L × I PEAK
f S(MAX) = ---(19)
V OUT(NOM) ) × L
Therefore, the inductance can be selected according
Figure 24- The comparison between predicted and
measured output voltage versus output current
Switching frequency versus output current
1200
1000
800
600
400
200
0
to the maximum desired frequency as shown in the fol-
0
0.2
0.4
0.6
0.8
lowing:
Output current (amp)
L
V IN × (V D - V OUT(NOM) )
(V IN + V D -
---(20)
Predicted fs(KHz)
Experiment fs (kHz)
V OUT(NOM) ) × f S(MAX) × I PEAK
Fig. 24 and Fig.25 shows the theorectical predication
and calculation results for the output voltage and fre-
quency versus output current.
Figure 25 - The comparison between predicted
and measured switching frequency versus
output current
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