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TEA1520P Datenblatt(PDF) 6 Page - NXP Semiconductors

Teilenummer TEA1520P
Bauteilbeschribung  SMPS ICs for low-power systems
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TEA1520P Datenblatt(HTML) 6 Page - NXP Semiconductors

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TEA152X_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 23 March 2009
6 of 17
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
8.4 Valley switching
A new cycle is started when the primary switch is switched on (see Figure 4). After a
certain time (determined by the oscillator voltage RC and the internal regulation level), the
switch is turned off and the secondary stroke starts. The internal regulation level is
determined by the voltage on pin REG.
After the secondary stroke, the drain voltage shows an oscillation with a frequency of
approximately:
(1)
where:
Lp = primary self inductance
Cp = parasitic capacitance on drain node
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.
A: Start of new cycle with valley switching.
B: Start of new cycle in a classical PWM system.
Fig 4.
Signals for valley switching
1
2
π
×
L
p
C
p
×
()
×
-----------------------------------------------
mgt423
drain
valley
secondary
ringing
secondary
stroke
primary
stroke
secondary
stroke
RC
oscillator
regulation level
A
B


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