TOP221 データシートの表示（PDF） - Power Integrations, Inc

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TOP221

Three-Terminal Off-Line PWM Switch

Power Integrations, Inc 

TOP221-227

BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS

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

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 VC 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.

Typical Performance Characteristics

BREAKDOWN vs. TEMPERATURE

FREQUENCY vs. TEMPERATURE

Junction Temperature (°C)

CURRENT LIMIT vs. TEMPERATURE

Junction Temperature (°C)

16

Rev. G 08/16

Junction Temperature (°C)

IC vs. DRAIN VOLTAGE

2

VC = 5 V

1.6

1.2

0.8

0.4

0

0

20 40 60 80 100

DRAIN Voltage (V)

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