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.
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
turnedonfirstandtheDRAINpowersupplysecondifcontinuous
drainvoltagewaveformsaretobeobserved. The12.5%chance
of being in the correct state is due to the 8:1 counter.
When the DRAIN supply is turned on, the part will be in the
auto-restartmode. TheCONTROLpinvoltagewillbeoscillating
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
Typical Performance Characteristics
BREAKDOWN vs. TEMPERATURE
FREQUENCY vs. TEMPERATURE
1.1
1.2
1.0
0.8
0.6
0.4
0.2
1.0
0.9
0
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
Junction Temperature (°C)
Junction Temperature (°C)
CURRENT LIMIT vs. TEMPERATURE
I vs. DRAIN VOLTAGE
C
1.2
2
V
= 5 V
C
1.0
0.8
0.6
0.4
0.2
1.6
1.2
0.8
0.4
0
0
-50 -25
0
25 50 75 100 125 150
0
20
40
60
80
100
Junction Temperature (°C)
Drain Voltage (V)
A
4/99
13
POWERINT [ Power Integrations ]
