TOP232 datasheet(30/38 Pages) POWERINT

30 / 38 page

Rev. D 10/20

TOP232-234

www.power.com

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

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

waveform may be observed. It is recommended that the V

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

05K

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:

TOP232 Datasheet(PDF) 30 Page - Power Integrations, Inc.

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