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TOP242 데이터시트(PDF) 41 Page - Power Integrations, Inc.

부품명 TOP242
상세설명  Family Extended Power, Design Flexible,Integrated Off-line Switcher
PDF  48 Pages
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제조업체  POWERINT [Power Integrations, Inc.]
홈페이지  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TOP242 데이터시트(HTML) 41 Page - Power Integrations, Inc.

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TOP242-249
41
August 8, 2000
E
7/01
The following precautions should be followed when testing
TOPSwitch-GX by itself outside of a power supply. The
schematic 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-
BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS
Typical Performance Characteristics
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
C 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.
Figure 54. Current Limit vs. MULTI-FUNCTION Pin Current.
Figure 55. Current Limit vs. External Current Limit Resistance.
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
60
40
80
100
120
140
160
180
200
-250
-200
-150
-100
-50
IM (µA)
PI-2653-033001
0
Scaling Factors:
TOP242:
.45
TOP243 P/G:
.75
TOP243 Y/R:
.90
TOP244 P/G:
1
TOP244 Y/R: 1.35
TOP245 Y/R: 1.80
TOP246 Y/R: 2.70
TOP247 Y/R: 3.60
TOP248 Y/R: 4.50
TOP249 Y/R: 5.40
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
60
40
80
100
120
140
160
180
200
0
5K
10K
15K
20K
25K
30K
35K
40K
External Current Limit Resistor RIL (Ω)
PI-2652-033001
45K
Scaling Factors:
TOP242:
.45
TOP243 P/G:
.75
TOP243 Y/R:
.90
TOP244 P/G:
1
TOP244 Y/R: 1.35
TOP245 Y/R: 1.80
TOP246 Y/R: 2.70
TOP247 Y/R: 3.60
TOP248 Y/R: 4.50
TOP249 Y/R: 5.40
Maximum and minimum levels
are based on characterization.
Minimum
Typical
Maximum



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