TOP243FN datasheet(15/52 Pages) POWERINT

15 / 52 page

TOP242-250

12/04

Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins

PI-2617-050100

Input

Voltage

C S

CONTROL

C L X S F

PI-2618-081403

Input

Voltage

CONTROL

2 M

Ω

RLS

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%

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

PI-2620-040501

Input

Voltage

CONTROL

2 M

Ω

30 k

Ω

RLS

1N4148

VOV = IOV x RLS

For Values Shown

VOV = 450 VDC

PI-2623-092303

Input

Voltage

RIL

For RIL = 12 kΩ

ILIMIT = 69%

See Figure 54b for

other resistor values

(RIL)

For RIL = 25 kΩ

ILIMIT = 43%

CONTROL

PI-2624-040501

Input

Voltage

2.5 M

Ω

RLS

6 k

Ω

RIL

100% @ 100 VDC

63% @ 300 VDC

ILIMIT =

CONTROL

Figure 16. Three Terminal Operation (LINE-SENSE and

EXTERNAL CURRENT LIMIT Features Disabled.

FREQUENCY Pin Tied to SOURCE or CONTROL Pin).

Figure 17. Line-Sensing for Under-Voltage, Overvoltage and Line

Feed-Forward.

Figure 20. Externally Set Current Limit.

Figure 21. Current Limit Reduction with Line Voltage.

Figure 18. Line-Sensing for Under-Voltage Only (Overvoltage

Disabled).

Figure 19. Linse-Sensing for Overvoltage Only (Under-Voltage

Disabled). Maximum Duty Cycle Reduced at Low Line

and Further Reduction with Increasing Line Voltage.

TOP243FN 数据表(PDF) 15 Page - Power Integrations, Inc.

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TOP243FN 数据表(PDF) 15 Page - Power Integrations, Inc.

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