TOP242F datasheet(41/52 Pages) POWERINT

41 / 52 page

TOP242-250

1/02

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

BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS

Typical Performance Characteristics

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

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-2653-010802

Scaling Factors:

TOP242:

.45

TOP243 P/G:

.75

TOP243 Y/R/F:

.90

TOP244 P/G:

TOP244 Y/R/F: 1.35

TOP245:

1.80

TOP246:

2.70

TOP247:

3.60

TOP248:

4.50

TOP249:

5.40

TOP250:

6.32

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

05K

10K

15K

20K

25K

30K

35K

40K

External Current Limit Resistor RIL (Ω)

PI-2652-010802

45K

Scaling Factors:

TOP242:

.45

TOP243 P/G:

.75

TOP243 Y/R/F:

.90

TOP244 P/G:

TOP244 Y/R/F: 1.35

TOP245:

1.80

TOP246:

2.70

TOP247:

3.60

TOP248:

4.50

TOP249:

5.40

TOP250:

6.32

Maximum and minimum levels

are based on characterization.

Minimum

Typical

Maximum

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