TOP242 Ver la hoja de datos (PDF) - Power Integrations, Inc

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Fabricante

TOP242

Extended power, design elexible, integrated off-line switcher

Power Integrations, Inc 

TOP242-250

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

+

DC

Input

Voltage

D

L

CONTROL

C

CLXS F D

CS D

+

DC

Input

Voltage

VUV = IUV x RLS

VOV = IOV x RLS

For RLS = 2 MΩ

RLS 2MΩ VUV = 100 VDC

VOV = 450 VDC

DCMAX@100 VDC = 78%

DCMAX@375 VDC = 38%

D

L

CONTROL

C

-

S

XF

-

S

General PI-2617-050100 Information & Table of Contents PI-2618-040501

Figure 16. Three Terminal Operation (LINE-SENSE and

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

EXTERNAL CURRENT LIMIT Features Disabled.

Line Feed Forward.

FREQUENCY Pin can be tied to SOURCE or

CONTROL Pin).

Product Selector Guide 1

+

DC

Input

Voltage

6.2 V

2 MΩ

VUV = RLS x IUV

For Value Shown

RLS VUV = 100 VDC

22 kΩ

D

M

CONTROL

C

-

S

PI-2510-040501

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

Disabled).

+

Data Sheets 2

2 MΩ

VOV = IOV x RLS

DC

Input

Voltage

-

Application Notes 3 For Values Shown

RLS

VOV = 450 VDC

D

Design 30 kΩ

L

1N4148

Ideas

4

CONTROL

DeCsign Tools 5

S

Quality and Reliability PI-2620-040501 6

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

Disabled). Maximum Duty Cycle will be reduced at

Low LinPe. ackage Information 7

+

DC

Input

Voltage

DPA-Switch DC-DC Seminar 8

For RIL = 12 kΩ

+

ILIMIT = 100% @ 100 VDC

ILIMIT = 69%

ILIMIT = 63% @ 300 VDC

LinForkRISL = 2w5 kiΩtch & TinySwRLSit2c.5hMΩ-II AC-DC Seminar 9

ILIMIT = 43%

See fig. 55 for other

D

resistor values (RIL)

CONTROL

C

DC

TOPSwInpuittch-GXD AC-DC Seminar 10

Voltage

CONTROL

C

S

X

Sales RepresentativesS anXd Distributors 11

RIL

-

RIL

-

6 kΩ

PI-2623-040501

PI-2624-040501

Figure 20. Externally Set Current Limit.

Figure 21. Current Limit Reduction with Line Voltage.

16 H

9/02

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