TOP232P datasheet(30/36 Pages) POWERINT

30 / 36 page

TOP232-234

7/01

The following precautions should be followed when testing

TOPSwitch-FX by itself outside of a power supply. The schematic

shown in Figure 34 is suggested for laboratory testing of

TOPSwitch-FX.

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-FX, which then will come up in the

correct state.

1.0

-250

-200

-150

-100

-50

IM (µA)

CURRENT LIMIT vs. MULTI-FUNCTION

PIN CURRENT

PI-2540-033001

100

120

140

160

180

200

TOP234 1.50

TOP233 1.00

TOP232 0.50

Scaling Factors:

1.0

1.1

100

120

140

160

180

200

10K

15K

20K

25K

External Current Limit Resistor RIL (Ω)

CURRENT LIMIT vs. EXTERNAL

CURRENT LIMIT RESISTANCE

PI-2539-033001

30K

Maximum and minimum levels

are based on characterization.

Maximum

Minimum

Typical

TOP234 1.50

TOP233 1.00

TOP232 0.50

Scaling Factors:

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