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TDA4867 Folha de dados(PDF) 4 Page - NXP Semiconductors |
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TDA4867 Folha de dados(HTML) 4 Page - NXP Semiconductors |
4 / 14 page 2003 Feb 05 4 Philips Semiconductors Preliminary specification Full bridge current driven vertical deflection booster TDA4867J PINNING FUNCTIONAL DESCRIPTION The TDA4867J consists of a differential input stage, two output stages, a flyback generator, a protection circuit for the output stages and a guard circuit. Differential input stage The differential input stage has a high CMRR differential current mode input (pin INP and pin INN) that results in a high electromagnetic immunity and is especially suitable for driver units with differential (e.g. TDA485x or SAA4856) and single-ended current signals. The differential input stage delivers the driver signals for the output stages. In combination with the SAA4856 the power save mode can be achieved via the input pins without additional components. Output stages The two output stages are current driven in opposite phase and operate in combination with the deflection coil in a full bridge configuration. Therefore, the TDA4867J requires no external coupling capacitor and operates with one supply voltage (VP) and a separate adjustable flyback supply voltage (VFB) only. The deflection current through the coil (Idefl) is measured with the resistor Rm which produces a voltage drop: Urm ≈ Rm × Idefl. At pin FEEDB a part of Idefl is fed back to the input stage. The feedback input has a current input characteristic which holds the differential voltage between pin FEEDB and pin OUTB on zero. Therefore the feedback current (IFEEDB) through Rref is: The input stage directly compares the driver currents into pins INP and INN with the half of the feedback current (IFEEDB). Any difference of this comparison leads to a more or less driver current for the output stages. The relation between the deflection current and the differential input current (Ii(dif) =IINP − IINN) is: or: The deflection current can be adjusted up to ±1.25 A by varying Rref when Rm is fixed to 1 Ω. Flyback generator The flyback generator supplies the output stage A during flyback. This makes it possible to optimize power consumption (supply voltage VP) and flyback time (flyback voltage VFB) separately. Due to the absence of a decoupling capacitor the flyback voltage is fully available. In parallel with the deflection yoke and the damping resistor (Rp) an additional capacitor (CSP) and a series resistor (RSP) have to be used. The flyback time can be optimized depending on the value of CSP. SYMBOL PIN DESCRIPTION INP 1 non-inverted input INN 2 inverted input VP 3 supply voltage OUTB 4 output B GND 5 ground OUTA 6 output A VFB 7 flyback supply voltage GUARD 8 guard output or power save mode input FEEDB 9 feedback input handbook, halfpage TDA4867J MGU989 1 2 3 4 5 6 7 8 9 INP INN VP OUTB GND OUTA VFB GUARD FEEDB Fig.2 Pin configuration. I FEEDB R m R ref ---------- I defl × ≈ I idif () 2I FEEDB × R m R ref ---------- I defl × 2 × ≈ = I defl I idif () R ref 2R × m ----------------- × ≈ |
Nº de peça semelhante - TDA4867 |
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Descrição semelhante - TDA4867 |
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