TOP258MN datasheet(19/50 Pages) POWERINT

19 / 50 page

Rev. M 12/21

TOP252-262

www.power.com

PI-4729-120307

Input

Voltage

Sense Output Voltage

VUV = IUV × RLS + VM (IM = IUV)

VOV = IOV × RLS + VM (IM = IOV)

For RLS = 4 MΩ

VUV = 102.8 VDC

VOV = 451 VDC

DCMAX @ 100 VDC = 76%

DCMAX @ 375 VDC = 41%

CONTROL

RLS

4 M

Ω

Figure 31. Line Sensing for Undervoltage, Overvoltage, Line Feed-Forward and

Latched Output Overvoltage Protection.

PI-4730-120307

Input

Voltage

Sense Output Voltage

VUV = IUV × RLS + VM (IM = IUV)

VOV = IOV × RLS + VM (IM = IOV)

For RLS = 4 MΩ

VUV = 102.8 VDC

VOV = 451 VDC

DCMAX @ 100 VDC = 76%

DCMAX @ 375 VDC = 41%

CONTROL

RLS

4 M

Ω

VROVP

ROVP

OVP >3kΩ

Figure 32. Line Sensing for Undervoltage, Overvoltage, Line Feed-Forward and

Hysteretic Output Overvoltage Protection.

PI-4731-120307

Input

Voltage

VUV = RLS × IUV + VM (IM = IUV)

For Values Shown

VUV = 103.8 VDC

RLS

6.2 V

4 M

Ω

40 k

Ω

CONTROL

PI-4732-120307

Input

Voltage

VOV = IOV × RLS + VM (IM = IOV)

For Values Shown

VOV = 457.2 VDC

CONTROL

RLS

1N4148

4 M

Ω

55 k

Ω

Figure 33. Line Sensing for Undervoltage Only (Overvoltage Disabled).

Figure 34. Line Sensing for Overvoltage Only (Undervoltage Disabled). Maximum

Duty Cycle Reduced at Low Line and Further Reduction with

Increasing Line Voltage.

Typical Uses of MULTI-FUNCTION (M) Pin (cont.)

Figure 35. Externally Set Current Limit (Not Normally Required – See M Pin

Operation Description).

PI-4733-021308

Input

Voltage

For RIL = 12 kΩ

ILIMIT = 61%

CONTROL

RIL

See Figures 55b for other

resistor values (RIL) to

select different ILIMIT values.

For RIL = 19 kΩ

ILIMIT = 37%

PI-4734-092107

Input

Voltage

CONTROL

RIL

RLS

2.5 M

Ω

6 k

Ω

100% @ 100 VDC

53% @ 300 VDC

ILIMIT =

Figure 36. Current Limit Reduction with Line Voltage (Not Normally Required –

See M Pin Operation Description).

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