TOP222PN Datasheet, PDF (16/21 Pages) Power Integrations, Inc. – Three-terminal Off-line PWM Switch

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 schematic
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
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 V_C 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. 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
1.1
1.0
0.9
-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)
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)
I_C 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)
16 D
7/01