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TEA1501T View Datasheet(PDF) - Philips Electronics

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TEA1501T
Philips
Philips Electronics Philips
TEA1501T Datasheet PDF : 21 Pages
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Philips Semiconductors
regulation
level AUX
(V)
20
17.5
TEA1501
GreenChip SMPS controller IC
SAUX
0
CPAUX
0
40
100
burst duty cycle (%)
mgm826
Fig 6. Regulation level AUX as a function of burst duty cycle
7.3.13 Counter
The power delivered to the load (auxiliary and secondary) is a function of the number of
energy pulses per burst, according to the following formula
Pload
=
η
×
12--
×
L
p
×
I
2
prim
×
f burst × N
Where η is the efficiency, Lp is the primary inductance, Iprim is the primary peak current,
fburst is the burst frequency and N is the number of pulses in one burst period.
The counter counts the number of pulses in each burst period and detects if the Ndata
threshold is passed. The counter state is used for the data transfer function and for the
supply current tracking.
7.3.14 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 the TEA1501 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 AUX 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 the TEA1501 rises linearly with the counter state according
to the following formula, see Figure 7.
IAUX = ktracking × N
For counter states of 112 and higher the supply current remains on its maximum value.
TEA1501_2
Product data sheet
Rev. 02 — 31 March 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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