TOP242R POWERINT [Power Integrations, Inc.], TOP242R Datasheet - Page 41

• Manufacturer Part Number: TOP242R
• Description: TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
• Manufacturer: POWERINT [Power Integrations, Inc.]

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
Typical Performance Characteristics
BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS
Figure 54. Current Limit vs. MULTI-FUNCTION Pin Current.
Figure 55. 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
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
-250
0
Maximum and minimum levels
are based on characterization.
Minimum
5K
-200
Typical
10K
External Current Limit Resistor R
15K
Maximum
-150
20K
I
M
(µA)
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 V
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.
25K
-100
30K
IL
(Ω)
Scaling Factors:
TOP242:
TOP243 P/G:
TOP243 Y/R/F:
TOP244 P/G:
TOP244 Y/R/F: 1.35
TOP245:
TOP246:
TOP247:
TOP248:
TOP249:
TOP250:
35K
-50
Scaling Factors:
TOP242:
TOP243 P/G:
TOP243 Y/R/F:
TOP244 P/G:
TOP244 Y/R/F: 1.35
TOP245:
TOP246:
TOP247:
TOP248:
TOP249:
TOP250:
1.80
2.70
3.60
4.50
5.40
6.32
.45
.75
.90
40K
1
PI-2653-010802
PI-2652-010802
1.80
2.70
3.60
4.50
5.40
6.32
.45
.75
.90
TOP242-250
1
45K
0
200
180
160
140
120
100
80
60
40
200
180
160
140
120
100
80
60
40
1/02
G
C
power
41