TOP242 datasheet(41/48 Pages) POWERINT

41 / 48 page

TOP242-249

August 8, 2000

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

100

120

140

160

180

200

-250

-200

-150

-100

-50

IM (µA)

PI-2653-033001

Scaling Factors:

TOP242:

.45

TOP243 P/G:

.75

TOP243 Y/R:

.90

TOP244 P/G:

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

100

120

140

160

180

200

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:

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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