tea1610t NXP Semiconductors, tea1610t Datasheet - Page 7

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

NXP Semiconductors
TEA1610T_P_3
Product data sheet
8.4 Minimum frequency resistor
8.5 Maximum frequency resistor
t
I
f
The R
current input (held at a temperature independent voltage level of 0.6 V). The charge
current of the capacitor C
The R
charge current (rising slope) of the C
frequency is defined by this minimum charge current (I
The output voltage is regulated by changing the frequency of the half-bridge converter.
The maximum frequency is determined by the R
the error amplifier output VCO and the oscillator current input pin IRS. The current that
flows through the R
resistor. As a result, the charge current I
increases. As the falling slope of the oscillator is constant, the relationship between the
output frequency and the charge current is not a linear function (see
Figure
The maximum output voltage of the error amplifier and the value of R
maximum frequency:
f
f
I
t
I
t
IRS1
IRS1
bridge min
IRS2
IRS min
osc min
IRS2
IRS2 max
osc max
=
=
=
f(min)
=
f(min)
9):
C
--------------------------
-----------------
R
-------------------------------------------- -
2
V
-------------------------- -
2
=
=
2.4V
=
f
f min
VCO
=
resistor is connected between the V
resistor has a voltage drop of 2.4 V and its resistance defines the minimum
=
----------------------- -
t
-------------------------------------------------------- -
2
C
------------ -
T
R
I
dt
I
V
-------------------------------------- -
IRS1
OSC
f
IRS1
1
-------------------- -
f
V
+
–
f
VCO max
osc min
1
Cf
0.6
I
t
IRS1
IRS2
2
C
+
V
R
f
I
Cf
f
IRS2
+
resistor (I
f
Rev. 03 — 26 March 2007
I
–
V
IRS2 max
0.6
f
Cf
is twice the current flowing into the IRS pin.
IRS2
Zero-voltage-switching resonant converter controller
) is added to the current flowing through the R
f
capacitor if the control current is zero. The minimum
CF
TEA1610P; TEA1610T
increases and the oscillation frequency
REF
f
pin (3 V reference voltage) and the IRS
resistor which is connected between
IRS1
) and the discharge current:
Figure 7
f
© NXP B.V. 2007. All rights reserved.
determine the
and
f(min)
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