TOP254 datasheet(17/50 Pages) POWERINT

17 / 50 page

Rev. M 12/21

TOP252-262

www.power.com

PI-4720-120307

Input

Voltage

VUV = RLS × IUV + VV (IV = IUV)

For Values Shown

VUV = 103.8 VDC

RLS

6.2 V

4 M

Ω

40 k

Ω

CONTROL

PI-4721-120307

Input

Voltage

CONTROL

4 M

Ω

55 k

Ω

RLS

1N4148

VOV = IOV × RLS + VV (IV = IOV)

For Values Shown

VOV = 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.

PI-4722-021308

Input

Voltage

RIL

For RIL = 12 kΩ

ILIMIT = 61%

See Figure 55b for other

resistor values (RIL).

TOP259-261YN would

use the G pin as the

return for R

IL.

For RIL = 19 kΩ

ILIMIT = 37%

CONTROL

PI-4723-011008

Input

Voltage

2.5 M

Ω

RLS

6 k

Ω

RIL

100% @ 100 VDC

53% @ 300 VDC

ILIMIT =

TOP259-261YN would

use the G pin as the

return for R

IL.

CONTROL

PI-2625-011008

Input

Voltage

ON/OFF

47 K

Ω

QR 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

CONTROL

ON/OFF

16 k

Ω

PI-4724-011008

Input

Voltage

RIL

12 k

Ω

For RIL =

ILIMIT = 61%

19 k

Ω

For RIL =

ILIMIT = 37%

QR 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

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.

TOP254 Scheda tecnica(PDF) 17 Page - Power Integrations, Inc.

TOP254 Scheda tecnica(HTML) 17 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

Scheda tecnica Scarica

Link URL