TOP254PN datasheet(17/48 Pages) POWERINT

Part #	TOP254PN

Description	Enhanced EcoSmart, Integrated Off-Line Switcher with Advanced Feature Set and Extended Power Range

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Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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17 / 48 page

Rev. F 01/09

17

TOP252-262

www.powerint.com

PI-4720-120307

DC

Input

Voltage

+

-

DV

S

C

V

UV = RLS × IUV +VV (IV = IUV)

For Values Shown

V

UV = 103.8 VDC

R

LS

6.2 V

4 M

40 k

CONTROL

PI-4721-120307

DC

Input

Voltage

+

-

D

S

C

CONTROL

V

4 M

55 k

RLS

1N4148

V

OV = IOV ×RLS +VV (IV = IOV)

For Values Shown

V

OV = 457.2 VDC

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

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

Duty Cycle Reduced at Low Line and Further Reduction with

Increasing Line Voltage.

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

Figure 22. External Set Current Limit.

X

PI-4722-021308

DC

Input

Voltage

+

-

D

S

C

R

IL

For R

IL = 12 k

I

LIMIT = 61%

See Figure 55b for other

resistor values (R

IL).

TOP259-261YN would

use the G pin as the

return for R

IL.

For R

IL = 19 k

I

LIMIT = 37%

CONTROL

X

PI-4723-011008

DC

Input

Voltage

+

-

D

S

C

2.5 M

R

LS

6 k

R

IL

100% @ 100 VDC

53% @ 300 VDC

I

LIMIT =

I

LIMIT =

TOP259-261YN would

use the G pin as the

return for R

IL.

CONTROL

X

PI-2625-011008

DC

Input

Voltage

+

-

D

S

C

ON/OFF

47 K

Q

R can be an optocoupler

output or can be replaced by

a manual switch.

TOP259-261YN would

use the G pin as the

return for Q

R.

Q

R

CONTROL

X

ON/OFF

16 k

PI-4724-011008

DC

Input

Voltage

+

-

D

S

C

R

IL

Q

R

12 k

For R

IL =

I

LIMIT = 61%

19 k

For R

IL =

I

LIMIT = 37%

Q

R can be an optocoupler

output or can be replaced

by a manual switch.

CONTROL

TOP259-261YN would

use the G pin as the

return for Q

R.

Figure 23. Current Limit Reduction with Line Voltage.

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

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

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TOP254PN Datasheet(PDF) 17 Page - Power Integrations, Inc.

TOP254PN Datasheet(HTML) 17 Page - Power Integrations, Inc.

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