TEA1610T Просмотр технического описания (PDF) - NXP Semiconductors.

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TEA1610T

Zero-voltage-switching resonant converter controller

NXP Semiconductors. 

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 flowing into the IRS pin.

The Rf(min) resistor has a voltage drop of 2.4 V and its resistance defines the minimum

charge current (rising slope) of the Cf capacitor if the control current is zero. The minimum

frequency is defined by this minimum charge current (IIRS1) and the discharge current:

IIRS1

=

----2---.-4---V------

R f (min)

tIRS1 = -C--2---f--×-×---I--∆-I--R-V--S--C-1---f

f osc(min)

=

-----------1------------

tdt + tIRS1

f bridge(min) = -f---o---s--c-2-(--m----i-n---)

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 R∆f resistor which is connected between

the error amplifier output VCO and the oscillator current input pin IRS. The current that

flows through the R∆f resistor (IIRS2) is added to the current flowing 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

Figure 9):

I IRS2 = V-----V---C--R-O---∆--–-f----0---.-6-

tIRS2 = 2-----×-----C(--I---fI--R-×--S--1-∆---+-V----IC---I-fR----S--2---)

The maximum output voltage of the error amplifier and the value of R∆f determine the

maximum frequency:

I IRS2(max) = V-----V---C---O----(-R-m---∆a---xf--)---–-----0---.-6--

tIRS(min) = 2-----×-----(--I---I-C-R---S-f-2--×--+---∆--I--V-I--R--C-S--f2---(--m---a---x--)---)

f osc(max) = T-----O-1--S---C-

TEA1610T_P_3

Product data sheet

Rev. 03 — 26 March 2007

© NXP B.V. 2007. All rights reserved.

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