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TEA1833LTS Fiches technique(PDF) 10 Page - NXP Semiconductors

No de pièce TEA1833LTS
Description  GreenChip SMPS control IC
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1833LTS Fiches technique(HTML) 10 Page - NXP Semiconductors

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TEA1833LTS
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© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2015
10 of 24
NXP Semiconductors
TEA1833LTS
GreenChip SMPS control IC
The output voltage can drop, for instance, because a load is too high or a short circuit
event occurs. If the output voltage drops, the decrease of the transformer current during
the secondary stroke time (tsec) becomes less. As a result, the next cycle starts at a higher
peak current.
Also, at the next cycle, the minimum on-time equals the blanking time. During this
blanking time, the peak current can increase to above the targeted regulation level. If the
transformer current does not decrease sufficiently during the secondary stroke, the peak
current can continuously increase to such a level that the transformer saturates
(see Figure 10).
To avoid this continuous peak current increase, also called runaway, the IC features a
special protection (see Figure 11).
If the system detects that the peak current already exceeds the targeted level after 1
s,
the next switching period time is extended from 7.7
s (f
sw =130 kHz) to 28 s
(fsw = 36 kHz). The time of the secondary stroke is then sufficient to decrease the
transformer current to below the targeted peak current again.
Fig 10. Peak current runaway
Fig 11. OSCP peak current runaway


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