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TEA1522T View Datasheet(PDF) - NXP Semiconductors.

Part Name
Description
Manufacturer
TEA1522T
NXP
NXP Semiconductors. NXP
TEA1522T Datasheet PDF : 20 Pages
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NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
As soon as the oscillator voltage is high again and the secondary stroke has ended, the
circuit waits for a low drain voltage before starting a new primary stroke.
Figure 4 shows the drain voltage together with the valley signal, the signal indicating the
secondary stroke and the RC voltage.
The primary stroke starts some time before the actual valley at low ringing frequencies,
and some time after the actual valley at high ringing frequencies.
primary
stroke
secondary
stroke
secondary
ringing
drain
valley
secondary
stroke
RC
oscillator
regulation level
A
B
mgt423
Fig 4.
A: Start of new cycle with valley switching
B: Start of new cycle in a classical PWM system
Signals for valley switching
Figure 5 shows a typical curve for a reflected output voltage N × Vo of 80 V. This voltage is
the output voltage Vo (see Figure 6) transferred to the primary side of the transformer with
the factor N (determined by the turns ratio of the transformer). Figure 5 shows that the
system switches exactly at minimum drain voltage for ringing frequencies of 480 kHz, thus
reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started
at 33° before the valley. The switch-on losses are still reduced significantly.
TEA152X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 04 — 14 September 2010
© NXP B.V. 2010. All rights reserved.
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