TEA1610 Philips Semiconductors, TEA1610 Datasheet - Page 8

• Manufacturer Part Number: TEA1610
• Description: Zero-voltage-switching resonant converter controller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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 I
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 R
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 R
the TEA1610 after start-up.
2001 Apr 25
handbook, full pagewidth
Zero-voltage-switching
resonant converter controller
f(min)
and the minimum frequency setting is
f
, the initial switching frequency of
GH-SH
V DD
SD
GL
0
0
oscillation
VCO
is fed to the
down
shut-
Fig.8 Shut-down.
supply
off
8
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.
During shut-down mode, pin V
Zener diode at 12.0 V with 1 mA input current. This clamp
prevents V
supply current to the TEA1610 in shut-down mode.
When the TEA1610 is in the shut-down mode, it can be
activated again only by lowering V
level (5.3 V typical). The shut-down latch is then reset and
a new start-up cycle can commence (see Fig.8).
start-up
DD
oscillation
rising above the rating of 14 V due to low
t
TEA1610P; TEA1610T
V DD(start)
V DD(sdc)
V DD(reset)
V SD(th)
MGW002
DD
is clamped by an internal
DD
Product specification
below the V
DD
reset