NCP1013ST100T3 datasheet(11/24 Pages) ONSEMI

Part #	NCP1013ST100T3

Description	Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1010, NCP1011, NCP1012, NCP1013, NCP1014

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Figure 16. NCP101X Facing a Fault Condition (Vin = 150 Vdc)

Tstart

Tsw

TLatch

1 V Ripple

Latch−off

Level

The rising slope from the latch−off level up to 8.5 V

is expressed by: Tstart

+ DV1 · C

IC1

. The time during which

the IC actually pulses is given by tsw

+ DV2 · C

ICC1

.

Finally,

the

latch−off

time

can

be

derived

using the same formula topology: TLatch

+ DV3 · C

ICC2

.

From these three definitions, the burst duty−cycle

can be computed: dc

+

Tsw

Tstart

) Tsw ) TLatch

(eq. 2) .

dc

+

DV2

ICC1 · D

V2

ICC1 )

DV1

IC1 )

DV3

ICC2

(eq. 3) .

Feeding

the

equation with values extracted from the parameter section

gives a typical duty−cycle of 13%, precluding any lethal

thermal runaway while in a fault condition.

DSS Internal Dissipation

The Dynamic Self−Supplied pulls energy out from the

drain pin. In Flyback−based converters, this drain level can

easily go above 600 V peak and thus increase the stress on the

DSS startup source. However, the drain voltage evolves with

time and its period is small compared to that of the DSS. As

a result, the averaged dissipation, excluding capacitive losses,

can be derived by: PDSS + ICC1 · t Vds(t) u . (eq. 4) .

Figure 17 portrays a typical drain−ground waveshape where

leakage effects have been removed.

Figure 17. A typical drain−ground waveshape

where leakage effects are not accounted for.

Vds(t)

Vin

Vr

toff

dt

ton

t

Tsw

By looking at Figure 17, the average result can easily be

derived by additive square area calculation:

t Vds(t) u+ Vin·(1 * d) ) Vr · toff

Tsw

(eq. 5)

By developing Equation 5, we obtain:

t Vds(t) u+ Vin * Vin · ton

Tsw

) Vr · toff

Tsw

(eq. 6)

toff can be expressed by: toff

+ Ip ·

Lp

Vr

(eq. 7) where ton

can be evaluated by: ton

+ Ip ·

Lp

Vin

(eq. 8) .

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NCP1013ST100T3 Datasheet(PDF) 11 Page - ON Semiconductor

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