D

7/96

TOP200-4/14

13

NOTES:

1. For specifications with negative values, a negative temperature coefficient corresponds to an increase in

magnitude with increasing temperature, and a positive temperature coefficient corresponds to a decrease in

magnitude with increasing temperature.

2. It is possible to start up and operate

TOPSwitch at DRAIN voltages well below 36 V. However, the CONTROL pin

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

C) vs. DRAIN voltage for low voltage operation

characteristics.

PI-1126-041994

0.1

µF

47

µF

0-50 V

40 V

TOPSwitch

470

Ω

5 W

S2

S1

470

Ω

DRAIN

SOURCE

CONTROL

NOTE: This test circuit is not applicable for current limit or output characteristic measurements.

Figure 14. TOPSwitch General Test Circuit.

PI-1215-091794

DRAIN

VOLTAGE

HV

0 V

90%

10%

90%

t2

t1

DC =

t1

t2

Figure 12. TOPSwitch Duty Cycle Measurement.

Figure 13. TOPSwitch CONTROL Pin I-V Characteristic.

120

100

80

40

20

60

0

02

4

6

8

10

CONTROL Pin Voltage (V)

TYPICAL CONTROL PIN I-V CHARACTERISTIC

Latched Shutdown

Trigger Current (45 mA)

1

Slope

Dynamic

Impedance

=