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TEA1610T View Datasheet(PDF) - NXP Semiconductors.

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TEA1610T Datasheet PDF : 21 Pages
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NXP Semiconductors
TEA1610P; TEA1610T
Zero-voltage-switching resonant converter controller
f bridge(max) = -f---o---s--c-2-(--m----a--x---)
TOSC = tIRS(min) + tIFS
Bridge frequency accuracy is optimum in the low frequency region. At higher frequencies
both the dead time and the oscillator frequency show a decay.
The frequency of the oscillator depends on the value of capacitor Cf, the peak-to-peak
voltage swing VCf and the charge and discharge currents. However, at higher frequencies
the accuracy decreases due to delays in the circuit.
fosc
fosc(max)
fosc(start)
fosc(min)
0
Fig 7. Frequency range
IIRS
mgw001
8.6 Error amplifier
The error amplifier is a transconductance amplifier. Thus the output current at pin VCO is
determined by the amplifier transconductance and the differential voltage on input
pins I+ and I-. The output current IVCO is fed to the IRS input of the current-controlled
oscillator.
The source capability of the error amplifier increases current in the IRS pin when the
differential input voltage is positive. Therefore the minimum current is determined by
resistor Rf(min) and the minimum frequency setting is independent of the characteristics of
the error amplifier.
The error amplifier has a maximum output current of 0.5 mA for an output voltage up to
2.5 V. If the source current decreases, the oscillator frequency also decreases resulting in
a higher regulated output voltage.
During start-up, the output voltage of the amplifier is held at a constant value of 2.5 V. This
voltage level defines, together with resistor Rf, the initial switching frequency of the
TEA1610 after start-up.
8.7 Shut-down
The shut-down input (SD) has an accurate threshold level of 2.33 V. When the voltage on
input SD reaches 2.33 V, both power switches immediately switch off and the TEA1610
enters shut-down mode.
TEA1610T_P_3
Product data sheet
Rev. 03 — 26 March 2007
© NXP B.V. 2007. All rights reserved.
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