top209 Power Integrations, Inc., top209 Datasheet - Page 12

• Manufacturer Part Number: top209
• Description: Three-terminal Off-line Pwm Switch
• Manufacturer: Power Integrations, Inc.

2
NOTES: (continued)
C. It is possible to start up and operate TOPSwitch at DRAIN voltages well below 36 V. However, the CONTROL pin
Figure 10. TOPSwitch Duty Cycle Measurement.
Figure 12. TOPSwitch General Test Circuit.
12
VOLTAGE
TOP209/210
i. The 470
ii. The 40 V output supply should be replaced with a curve tracer capable of forcing 700 V.
iii. The curve tracer should initially be set at 0 V. The 0-50 V variable supply should be adjusted through a voltage
iv. The breakdown and the leakage measurements can now be taken with the curve tracer. The maximum
charging current is reduced, which affects start-up time and auto-restart frequency and duty cycle. Refer to the
characteristic graph on CONTROL pin charge current (I
DRAIN
sequence of 0 V, 6.5 V, 4.2 V, and 6.5 V.
voltage from the curve tracer must be limited to 700 V under all conditions.
A
8/97
0 V
HV
NOTE: This test circuit is not applicable for current limit or output characteristic measurements.
90%
5 W load resistor at the DRAIN pin should be shorted. S1 & S2 should stay closed.
D
S
t 1
C
S
10%
t 2
D =
t 1
t 2
PI-2048-050798
90%
0.1 F
C
) vs. DRAIN voltage for low voltage operation characteristics.
TYPICAL CONTROL PIN I-V CHARACTERISTIC
47 F
Figure 11. TOPSwitch CONTROL Pin I-V Characteristic.
120
100
80
60
40
20
0
S1
470
5 W
0
Impedance
Dynamic
0-50 V
CONTROL Pin Voltage (V)
470
2
=
Slope
S2
1
4
6
40 V
8
PI-1733-122095
10