TEA1501_N_1 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
TEA1501_N_1 Datasheet PDF : 21 Pages
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Philips Semiconductors
IAUX
(mA)
6.7
TEA1501
GreenChip SMPS controller IC
IAUX(high)
1.7
IAUX(low)
Ndata
28
56
112 counter state
mgm825
Fig 7. AUX current as a function of counter state
7.4 Design Equations
7.4.1 Primary peak current
7.4.1.1
The primary peak current is determined by the sense resistor RSOURCE and may be
calculated as shown below:
RSOURCE = V---I--d-p--e-r-t-i-e-m-c---t
Minimum value of RSOURCE
The maximum drain current is 0.25 A, this results in a minimum value for resistor RSOURCE
of 2.0 Ω.
7.4.2 Switch oscillator
The maximum output power of the converter is a function of the switching frequency,
provided that the converter operates in discontinuous conduction mode.
Pout(max)
=
η
×
12--
×
Lp
×
I
2
prim
×
f switch
Where η is the efficiency, Lp is the primary inductance, Iprim is the primary peak current
and fswitch is the switching frequency.
7.4.2.1
The switching frequency can be adjusted between 20 kHz and 50 kHz by the reference
resistor RREF:
f switch = k----s--w---i--t--c--h---1-×-----R----R---E----F-
Range of RREF values
The minimum value for resistor RREF is 24 kΩ, the maximum value is 62 kΩ.
TEA1501_2
Product data sheet
Rev. 02 — 31 March 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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