TOP243F datasheet(19/52 Pages) POWERINT

19 / 52 page

TOP242-250

1/02

Figure 32. Line Sensing for Under-Voltage Only (Overvoltage

Disabled).

PI-2510-040501

Input

Voltage

VUV = RLS x IUV

For Value Shown

VUV = 100 VDC

RLS

6.2 V

2 M

Ω

22 k

Ω

CONTROL

Figure 33. Line Sensing for Overvoltage Only (Under-Voltage

Disabled). Maximum Duty Cycle will be reduced at

Low Line.

Figure 34. Externally Set Current Limit.

PI-2517-040501

Input

Voltage

For RIL = 12 kΩ

ILIMIT = 69%

CONTROL

RIL

See fig. 55 for other

resistor values (RIL)

For RIL = 25 kΩ

ILIMIT = 43%

to select different

ILIMIT values

PI-2516-040501

Input

Voltage

VOV = IOV x RLS

For Values Shown

VOV = 450 VDC

CONTROL

RLS

1N4148

2 M

Ω

30 k

Ω

Figure 30. Three Terminal Operation (MULTI-FUNCTION

Features Disabled).

PI-2508-081199

Input

Voltage

CONTROL

PI-2509-040501

Input

Voltage

VUV = IUV x RLS

VOV = IOV x RLS

For RLS = 2 MΩ

VUV = 100 VDC

VOV = 450 VDC

DCMAX@100 VDC = 78%

DCMAX@375 VDC = 38%

CONTROL

RLS

2 M

Ω

Typical Uses of MULTI-FUNCTION (M) Pin

Figure 35. Current Limit Reduction with Line Voltage.

PI-2518-040501

Input

Voltage

CONTROL

RIL

RLS

2.5 M

Ω

6 k

Ω

100% @ 100 VDC

63% @ 300 VDC

ILIMIT =

Figure 31. Line Sensing for Undervoltage, Over-Voltage and

Line Feed Forward.

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