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TDA4867J Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA4867J Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 14 page 2003 Feb 05 11 Philips Semiconductors Preliminary specification Full bridge current driven vertical deflection booster TDA4867J Example Table 1 Values given from application diagram Fig.6 Note 1. Use heatsink compound. Table 2 Calculated values Note 1. Tj(max) =PIC × [Rth(j-mb) +Rth(mb-amb)]+Tamb. SYMBOL VALUE UNIT Idefl 0.71 A Ldeflcoil 5.2 mH Rdeflcoil 5.4 [= 4.2 + 7% + ∆R(ϑ)] Ω Rm 1 (+1%) Ω Rp 220 Ω Rref 3.4 k Ω VFB 40 V Tamb 50 °C Tdeflcoil 75 °C Rth(j-mb) 4 K/W Rth(mb-amb)(1) 6 K/W SYMBOL VALUE UNIT VP 8.5 V tflb ≈200 µs Ptot 3.4 W Pdefl 0.9 W PIC 2.5 W Rth(tot) 10 K/W Tj(max)(1) 75 °C Calculation formulae for supply voltage: Vb1 =Vsat(VP-OUTA) +Rdeflcoil × Idefl − U’L +Rm × Idefl +Vsat(OUTB-GND) Vb2 =Vsat(OUTA-GND) +Rdeflcoil × Idefl +U’L +Rm × Idefl +Vsat(VP-OUTB) for Vb1 >Vb2 :VP =Vb1 for Vb2 >Vb1 :VP =Vb2 where: U’L =Ldeflcoil × 2 × Idefl × fv fv = vertical deflection frequency. Calculation formulae for power consumption: where: PIC = power dissipation of the TDA4867J Ptot = total power dissipation Pdefl = power dissipation of the deflection coil. Calculation formulae for flyback time (tflb): P IC P tot P defl – = P tot V P I defl 2 --------- V P + 0.02 A 0.1 W V FB I FB × ++ × × = P defl 1 3 --- R deflcoil R m + () × I defl 2 × = t flb L deflcoil R deflcoil R m + --------------------------------- V FB R deflcoil R m + () I defl × + V FB R deflcoil R m + () I defl × – --------------------------------------------------------------------- ln × ≈ |
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