DPA424 Power Integrations, Inc., DPA424 Datasheet - Page 26

• Manufacturer Part Number: DPA424
• Description: Highly Integrated DC-DC Converter Ics For Distributed Power Architectures
• Manufacturer: Power Integrations, Inc.

The following precautions should be followed when testing
DPA-Switch by itself outside of a power supply. The schematic
shown in Figure 30 is suggested for laboratory testing of
DPA-Switch.
When the DRAIN pin supply is turned on, the part will be in the
auto-restart mode. The CONTROL pin voltage will be oscillating
at a low frequency between 4.8 and 5.8 V and the drain is turned
on every eighth cycle of the CONTROL pin oscillation. If the
CONTROL pin power supply is turned on while in this auto-
Typical Performance Characteristics
26
DPA423-426
BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS
J
5/03
Figure 32. Current Limit vs. External Current Limit Resistance.
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Figure 31. Current Limit vs. EXTERNAL CURRENT LIMIT Pin Current.
0
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
-230
Minimum
5
-180
External Current Limit Resistor R
10
Typical
Maximum
15
I
-130
X
(µA)
restart mode, there is only a 12.5% chance that the CONTROL
pin oscillation will be in the correct state (drain active state) so
that the continuous drain voltage waveform may be observed.
It is recommended that the V
and the DRAIN pin power supply second if continuous drain
voltage waveforms are to be observed. The 12.5% chance of
being in the correct state is due to the divide-by-8 counter.
Temporarily shorting the CONTROL pin to the SOURCE pin
will reset DPA-Switch, which then will come up in the correct
state.
20
-80
IL
(kΩ)
25
C
power supply be turned on first
-30
30
0
35