Datasheet

Load Current (A)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
40
45
50
55
60
65
70
75
80
85
90
Efficiency (%)
VFO/PWM Mode
PWM Mode Only
TPS23751
TPS23752
SLVSB97C –JULY 2012–REVISED JANUARY 2014 www.ti.com
Figure 26. TPS23751 and TPS23752 Light Load Efficiency versus Mode
Figure 27 illustrates operation through the VFO to PWM to VFO transitions. As load current increases, so does
V
CTL
. When V
CTL
exceeds the rising threshold, the TPS23751 and TPS23752 transition from VFO to PWM mode,
and SRD goes low. The converter now operates with fixed frequency and current demand set by V
CTL
. As load
current decreases, so does V
CTL
. When V
CTL
decays below the falling threshold, the TPS23751 and TPS23752
transition from PWM to VFO mode, and SRD goes high. The converter now operates with variable frequency set
by V
CTL
, and fixed current demand set by V
SRT
.
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