DPA426 Power Integrations, DPA426 Datasheet - Page 27

• Manufacturer Part Number: DPA426
• Description: (DPA423 - DPA426) Highly Integrated DC-DC Converter ICs for Distributed Power Architectures
• Manufacturer: Power Integrations

The following precautions should be followed when testing
DPA-Switch by itself outside of a power supply. The schematic
shown in Figure 32 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
BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS
Figure 34. 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 33. 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
DPA423-426
0
35
1/04
K
27