tea1610t NXP Semiconductors, tea1610t Datasheet - Page 14

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

NXP Semiconductors
12. Application information
TEA1610T_P_3
Product data sheet
Fig 9. Oscillator frequency and measured dead time as functions of charge current I
(kHz)
(1) f
(2) f
f
osc
800
600
400
200
0
OSC
OSC
0
at I
= 2 x f
IFS
bridge
= 500 mA.
.
An application example of a zero-voltage switching resonant converter application using
TEA1610 is shown in
level of 9.4 V by the 7.5 V Zener diode and the half-bridge is not driven. In the on-mode
the TEA1610 starts-up with a high-ohmic bleeder resistor. After passing the level for start
of oscillation, the TEA1610 is in normal operating mode and consumes the normal supply
current delivered by the 12 V supply. The dead time is set by R
frequency is adjusted by R
is adjusted with a potentiometer connected to the inverting input of the error amplifier and
is regulated via a feedback circuit. The shut-down input is used for overvoltage protection.
To prevent interference, filter capacitors can be added on pins IFS, IRS and V
maximum value of each filter capacitor is 100 pF.
Practical values of the application example are given in
oscillator frequency with capacitor C
current I
frequency (frequency set) calculated as described in
resistor”.
The measured dead time is directly related to the charge current (total current flowing into
pin IRS) and therefore to the oscillator frequency.
The measured frequency graph can be used to determine the required R
certain maximum frequency in an application with the same value of capacitor C
More application information can be found in application note AN99011 .
40
dead time (low to high)
IRS
. Note that the slope of the measured frequency differs from the theoretical
frequency set
Figure
Rev. 03 — 26 March 2007
80
f(min)
10. In the off-mode the V
and the frequency range is set by R
Zero-voltage-switching resonant converter controller
dead time (high to low)
f
= 220 pF is shown as a function of the charge
120
TEA1610P; TEA1610T
frequency measured
Section 8.5 “Maximum frequency
DD
Figure
voltage is pulled below the stop
160
IRS
9, in which the measured
dt
and C
I
IRS
f
. The output voltage
( A)
f
© NXP B.V. 2007. All rights reserved.
. The minimum
f
mgw003
resistor for a
REF
200
f
.
1200
900
600
300
0
. The
(ns)
t
14 of 21
dt