B

8/99

TNY256

12

Figure 17. Current Limit Envelope.

Figure 15. TinySwitch Duty Cycle Measurement.

Figure 16. TinySwitch Output Enable Timing.

PI-2048-050798

DRAIN

VOLTAGE

HV

0 V

90%

10%

90%

t2

t1

D =

t1

t2

Figure 14. TinySwitch General Test Circuit.

PI-2352-011899

0.1

µF

10 V

50 V

470

Ω

5 W

S2

470

Ω

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

D EN/UV

BP

S

S

S

S

S

150 V

S1

2 M

Ω

PI-2364-012699

EN/UV

tP

tEN/UV

t

P

=

1

f

OSC

(internal signal)

0.8

1.3

1.2

1.1

0.9

0.8

1.0

0

01

2

6

8

3

Time (

µs)

45

7

0.7

0.6

0.5

0.4

0.3

0.2

0.1

ILIMIT(MAX) @ 25 ˚C

ILIMIT(MIN) @ 25 ˚C

IINIT(MIN)

tLEB (Blanking Time)