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TD34063
TMC
Figure 5. Step-Up Converter
Test
Condition
Results
Line Regulation
V
in = 8.0 V to 16 V, Io = 175 mA
30 mV =
0.05%
Load Regulation
V
in = 12 V, Io = 75 mA to 175 mA
10 mV = ± 0.017%
Output Ripple
V
in = 12 V, Io = 175 mA
400 mVpp
Efficiency
V
in = 12 V, Io = 175 mA
87.7%
Output Ripple With Optional Filter
V
in = 12 V, Io = 175 mA
40 mVpp
Figure 6. External Current Boost Connections for Ic Peak Greater than 1.5 A
6a. External NPN Switch
6 b. External NPN Saturated Switch
(See Note 5 )
Note 5: If the output switch is driven into hard saturation (non-Darlington configuration) at low switch
currents (
300 mA) and high driver currents (
30 mA), it may take up to 2.0 us to come out of
saturation.
This condition will shorten the off time at frequencies
30 kHz, and is magnified at high
temperatures.
This condition does not occur with a Darlington configuration, since the output switch
cannot saturate.
If a non-Darlington configuration is used, the following output drive condition is
recommended.
±
≤
≥
≥
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