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TOP252

AC/DC Converters Off-Line Switcher IC 26W/64W PK

Power Integrations, Inc 

TOP252-262

Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)

+

DC

Input

Voltage

6.2 V

4 MΩ

VUV = RLS × IUV + VV (IV = IUV)

For Values Shown

VUV = 103.8 VDC

RLS

40 kΩ

D

V

CONTROL

C

-

S

PI-4720-120307

Figure 20. Line Sensing for Undervoltage Only (Overvoltage Disabled).

+

DC

Input

Voltage

RLS

VOV = IOV × RLS + VV (IV = IOV)

4 MΩ

For Values Shown

VOV = 457.2 VDC

55 kΩ

D

V

CONTROL

C

1N4148

-

S

PI-4721-120307

Figure 21. Line-Sensing for Overvoltage Only (Undervoltage Disabled). Maximum

Duty Cycle Reduced at Low Line and Further Reduction with

Increasing Line Voltage.

+

For RIL = 12 kΩ

ILIMIT = 61%

DC

Input

Voltage

-

For RIL = 19 kΩ

ILIMIT = 37%

See Figure 55b for other

D

resistor values (RIL).

CONTROL

C

S

X

RIL

TOP259-261YN would

use the G pin as the

return for RIL.

PI-4722-021308

Figure 22. External Set Current Limit.

+

RLS

DC

Input

Voltage

2.5 MΩ

D

ILIMIT = 100% @ 100 VDC

ILIMIT = 53% @ 300 VDC

TOP259-261YN would

use the G pin as the

return for RIL.

CONTROL

C

S

X

RIL

-

6 kΩ

Figure 23. Current Limit Reduction with Line Voltage.

PI-4723-011008

+

DC

Input

Voltage

QR can be an optocoupler

output or can be replaced by

a manual switch.

TOP259-261YN would

use the G pin as the

D

return for QR.

CONTROL

C

S

X

-

QR

ON/OFF

47 KΩ

PI-2625-011008

Figure 24. Active-on (Fail Safe) Remote ON/OFF.

+

QR can be an optocoupler

output or can be replaced

by a manual switch.

DC

Input

Voltage

-

D

CONTROL

C

For RIL = 12 kΩ

ILIMIT = 61%

For RIL = 19 kΩ

ILIMIT = 37%

TOP259-261YN would

S

X

use the G pin as the

RIL QR

return for QR.

ON/OFF

16 kΩ

PI-4724-011008

Figure 25. Active-on Remote ON/OFF with Externally Set Current Limit.

www.powerint.com

17

Rev. H 06/13

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