TOP412GN View Datasheet(PDF) - Power Integrations, Inc

Part Name

Description

Manufacturer

TOP412GN

Three-terminal DC to DC PWM Switch

Power Integrations, Inc 

TOP412/414

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 schematic

shown in Figure 11 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 oscillating

at a low frequency from 4.7 to 5.7 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-

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 supply 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.

Typical Performance Characteristics

BREAKDOWN vs. TEMPERATURE

1.1

1.0

0.9

-50 -25 0 25 50 75 100 125 150

Junction Temperature (°C)

CURRENT LIMIT vs. TEMPERATURE

1.2

1.0

0.8

0.6

0.4

0.2

0

-50 -25 0 25 50 75 100 125 150

Junction Temperature (°C)

FREQUENCY vs. TEMPERATURE

1.2

1.0

0.8

0.6

0.4

0.2

0

-50 -25 0 25 50 75 100 125 150

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)

13 A

4/99

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