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TEA1610 데이터시트(PDF) 7 Page - NXP Semiconductors |
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TEA1610 데이터시트(HTML) 7 Page - NXP Semiconductors |
7 / 20 page 2001 Apr 25 7 Philips Semiconductors Product specification Zero-voltage-switching resonant converter controller TEA1610P; TEA1610T Dead time resistor Rdt (see Fig.10) The dead time resistor Rdt is connected between the 3 V reference pin (VREF) and the IFS current input pin. The voltage on the IFS pin is kept constant at a temperature independant value of 0.6 V. The current that flows into the IFS pin is determined by the value of resistor Rdt and the 2.4 V voltage drop across this resistor. The IFS input current equals the discharge current of capacitor Cf and determines the falling slope of the oscillator. The falling slope time is used to create a dead time (tdt) between two successive switching actions of the half-bridge switches: Minimum frequency resistor (see Fig.10) The Rf(min) resistor is connected between the VREF pin (3 V reference voltage) and the IRS current input (held at a temperature independant 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: 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 Figs 7 and 9): The maximum output voltage of the error amplifier and the value of R∆f determine the maximum frequency: Bridge frequency accuracy is optimum in the low frequency region. At higher frequencies both the dead time and the oscillator frequency show a decay. The frequency of the oscillator depends on the value of capacitor Cf, the peak-to-peak voltage swing VCf and the charge and discharge currents. However, at higher frequencies the accuracy decreases due to delays in the circuit. I IFS 2.4 V R dt -------------- = t dt C f ∆V Cf × I IFS ------------------------- = t IFS t dt = I IRS1 2.4 V R fmin () ----------------- = t IRS1 C f ∆V Cf × 2I IRS1 × ------------------------- = f min 1 t dt t IRS1 + ------------------------ = I IRS2 V VCO 0.6 – R ∆f ----------------------------- = t IRS2 C f ∆V Cf × I IRS1 I IRS2 + -------------------------------- 2 × = I IRS2 max () V VCO max () 0.6 – R∆f ------------------------------------------ = t IRS min () C f ∆V Cf × I IRS1 I IRS2(max) + ------------------------------------------- 2 × = f max 1 T osc ---------- = T osc t IRS min () t IFS + = handbook, halfpage MGW001 fosc 0 IIRS fosc(max) fosc(start) fosc(min) Fig.7 Frequency range. |
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