TEA1501T/N1 Ver la hoja de datos (PDF) - Philips Electronics

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Fabricante

TEA1501T/N1

Greeny; GreenChip™

Philips Electronics 

Philips Semiconductors

Greeny; GreenChip™

Supply current tracking

For obtaining good load regulation, especially with low

cost transformers, a tracking circuit is included. The

tracking circuit makes the supply current of Greeny a

function of the secondary load. This makes the voltage

drop across the series resistance of the auxiliary winding

proportional to the voltage drop across the series

resistance of the secondary winding. Therefore, the

secondary output voltage tracks with the Vaux regulation

voltage.

The tracking starts at a counter state of 28. For a counter

state from 28 up to 112 (typical values) the supply current

of Greeny rises linearly with the counter state according to

the following formula (see Fig.7).

IVaux = ktracking × N

For counter states of 112 and higher the supply current

remains on its maximum value.

handboIoVka, uhaxlfpage

(mA)

6.7

MGM825

IVaux(HIGH)

1.7

IVaux(LOW)

Ndata

28

56

112 counter state

Fig.7 IVaux versus counter state.

1998 Aug 19

9

Preliminary specification

TEA1501

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