參數(shù)資料
型號(hào)： TEA1610T/N5,118
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, SO-16
文件頁(yè)數(shù)： 19/21頁(yè)
文件大?。?/td> 112K
代理商： TEA1610T/N5,118
TEA1610T_P_3
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 26 March 2007
7 of 21
NXP Semiconductors
TEA1610P; TEA1610T
Zero-voltage-switching resonant converter controller
8.4 Minimum frequency resistor
The Rf(min) resistor is connected between the VREF pin (3 V reference voltage) and the IRS
current input (held at a temperature independent voltage level of 0.6 V). The charge
current of the capacitor Cf is twice the current owing into the IRS pin.
The Rf(min) resistor has a voltage drop of 2.4 V and its resistance denes the minimum
charge current (rising slope) of the Cf capacitor if the control current is zero. The minimum
frequency is dened by this minimum charge current (IIRS1) and the discharge current:
8.5 Maximum frequency resistor
The output voltage is regulated by changing the frequency of the half-bridge converter.
The maximum frequency is determined by the Rf resistor which is connected between
the error amplier output VCO and the oscillator current input pin IRS. The current that
ows through the Rf resistor (IIRS2) is added to the current owing through the Rf(min)
resistor. As a result, the charge current ICF increases and the oscillation frequency
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 7 and
The maximum output voltage of the error amplier and the value of Rf determine the
maximum frequency:
I
IRS1
2.4V
R
f min
()
-----------------
=
t
IRS1
C
f
V
Cf
×
2I
IRS1
×
--------------------------
=
f
osc min
()
1
t
dt
t
IRS1
+
------------------------
=
f
bridge min
()
f
osc min
(
)
2
---------------------
=
I
IRS2
V
VCO
0.6
–
Rf
---------------------------
=
t
IRS2
C
f
V
Cf
×
2I
IRS1
I
IRS2
+
()
×
---------------------------------------------
=
I
IRS2 max
()
V
VCO max
()
0.6
–
Rf
---------------------------------------
=
t
IRS min
()
C
f
V
Cf
×
2I
IRS2
I
IRS2 max
()
+
()
×
---------------------------------------------------------
=
f
osc max
()
1
T
OSC
-------------
=
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