tea1610t NXP Semiconductors, tea1610t Datasheet - Page 8

• Manufacturer Part Number: tea1610t
• Description: Zero-voltage-switching Resonant Converter Controller
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TEA1610T_P_3
Product data sheet
8.6 Error amplifier
8.7 Shut-down
f
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 C
voltage swing V
the accuracy decreases due to delays in the circuit.
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 I
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 R
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 R
TEA1610 after start-up.
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.
T
bridge max
Fig 7. Frequency range
OSC
=
t
IRS min
f(min)
=
--------------------- -
f
and the minimum frequency setting is independent of the characteristics of
osc max
Cf
+
2
and the charge and discharge currents. However, at higher frequencies
t
IFS
Rev. 03 — 26 March 2007
f
f
osc(start)
f
osc(max)
osc(min)
f
osc
0
Zero-voltage-switching resonant converter controller
VCO
is fed to the IRS input of the current-controlled
TEA1610P; TEA1610T
f
, the initial switching frequency of the
I
IRS
mgw001
f
, the peak-to-peak
© NXP B.V. 2007. All rights reserved.
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