Rev. G 08/16

16

TOP221-227

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The following precautions should be followed when testing

TOPSwitch by itself outside of a power supply. The sche-

matic shown in Figure 14 is suggested for laboratory testing

of TOPSwitch.

When the DRAIN supply is turned on, the part will be in the

Auto-restart mode. The CONTROL pin voltage will be oscil-

lating at a low frequency from 4.7 to 5.7 V and the DRAIN is

turned on every eighth cycle of the CONTROL pin oscilla-

tion. If the CONTROL pin power supply is turned on while

BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS

Typical Performance Characteristics

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

C power sup-

ply be turned on first and the DRAIN 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

8:1 counter. Temporarily shorting the CONTROL pin to the

SOURCE pin will reset TOPSwitch, which then will come up

in the correct state.

2

1.2

1.6

0

0

20

40

60

80

100

DRAIN Voltage (V)

IC vs. DRAIN VOLTAGE

0.4

0.8

VC = 5 V

Junction Temperature (

°C)

BREAKDOWN vs. TEMPERATURE

Junction Temperature (

°C)

CURRENT LIMIT vs. TEMPERATURE

Junction Temperature (

°C)

FREQUENCY vs. TEMPERATURE