TOP243 View Datasheet(PDF) - Power Integrations, Inc
Part Name
Description
Manufacturer
TOP243 Datasheet PDF : 52 Pages
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TOP242-250
BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS
The following precautions should be followed when testing
TOPSwitch-GX by itself outside of a power supply. The sche-
matic shown in Figure 53 is suggested for laboratory testing of
TOPSwitch-GX.
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-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 wave-
form may be observed. It is recommended that the VC power
supply be turned on first 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 TOPSwitch-GX,
which then will come up in the correct state.
Typical Performance Characteristics
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
-250
-200
-150
-100
IM (µA)
Figure 54. Current Limit vs. MULTI-FUNCTION Pin Current.
PI-2653-010802
Scaling Factors:
TOP242:
.45 200
TOP243 P/G: .75
TOP243 Y/R/F: .90 180
TOP244 P/G:
1
TOP244 Y/R/F: 1.35 160
TOP245:
TOP246:
1.80
2.70 140
TOP247:
TOP248:
3.60
4.50 120
TOP249:
TOP250:
5.40
6.32 100
80
60
40
-50
0
1.1
PI-2652-010802
1.0
0.9
0.8
0.7
Minimum
0.6
0.5
Typical
0.4
0.3
Maximum and minimum levels
are based on characterization.
Maximum
Scaling Factors:
TOP242:
.45
200
TOP243 P/G: .75
180
TOP243 Y/R/F: .90
TOP244 P/G:
1
160
TOP244 Y/R/F: 1.35
TOP245:
1.80
140
TOP246:
2.70
TOP247:
3.60
120
TOP248:
4.50
TOP249:
5.40
100
TOP250:
6.32
80
60
0.2
0
40
5K
10K
15K
20K
25K
30K
35K
40K
45K
External Current Limit Resistor RIL (Ω)
Figure 55. Current Limit vs. External Current Limit Resistance.
41 H
9/02
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