TEA1530AT 데이터 시트보기 (PDF) - Philips Electronics
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TEA1530AT Datasheet PDF : 22 Pages
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Philips Semiconductors
TEA1530AT
GreenChip™II SMPS control IC
protection is reset. The latch is reset as soon as VCC drops below 4.5 V (typical value)
(this only occurs when the mains has been disconnected). The internal
overtemperature protection will also trigger this latch; see also Figure 1.
A voltage higher than 3 V on pin PROTECT will always latch the IC. This is independent of
the state of the IC.
7.12 OverTemperature protection (OTP)
The IC provides accurate OTP. The IC will stop switching when the junction temperature
exceeds the thermal shutdown temperature. When VCC drops to VUVLO, capacitor CVCC
will be recharged to the Vstart level, however switching will not restart. Subsequently, VCC
will drop again to VUVLO, etc.
Operation only recommences when VCC drops below a level of about 4.5 V (typically,
when Vmains is disconnected for a short period).
7.13 Soft start-up (pin SENSE)
To prevent transformer rattle at start-up or during hiccup, the transformer peak current is
slowly increased by the soft start function. This can be achieved by inserting a resistor
and a capacitor between pin SENSE (pin 6) and sense resistor Rsense. An internal current
source charges the capacitor to Vsense = Iss × Rss (about 0.5 V maximum).
The start level and the time constant of the increasing primary current level can be
adjusted externally by changing the values of Rss and Css.
I primary(max)
=
V-----o--c--p----–-----(--I---s--s---×-----R----s--s--)-
Rsense
τ = Rss × Css
During the start-up phase, the charging current Iss will flow as long as the voltage on
pin SENSE is below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the
soft start current source will start limiting current Iss. At Vstart, the Iss current source is
completely switched off; see Figure 7.
Since the soft start current Iss is subtracted from pin VCC charging current, the Rss value
will affect VCC charging current level by a maximum of 60 µA (typical).
Objective data sheet
Rev. 01 — 18 May 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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