전자부품 데이터시트 검색엔진 |
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TA7368PG 데이터시트(PDF) 2 Page - Toshiba Semiconductor |
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TA7368PG 데이터시트(HTML) 2 Page - Toshiba Semiconductor |
2 / 12 page TA7368PG/FG 2006-04-28 2 Precaution For Use And Application 1. Input stage The input stage of power amplifier (equivalent circuit) is comprised of a PNP differential pair (Q2 and Q3) preceded by a PNP emitter follower (Q1) which allows DC referencing of the source signal to ground. This eliminated the need for an input coupling capacitor. However, in case the brush noise of volume becomes a problem, provide serially a coupling capacitor to the input side. 2. Adjustment of voltage gain The voltage gain is fixed at GV≒40dB by the resistors (R4 and R5) in IC, however, its reduction is possible through adding Rf as shown in Figure 2. In this case, the voltage gain is obtained by the following equation. f R 4 R f R 4 R 5 R og 20 V G + + + = l It is recommended to use this IC with the voltage gain of GV = 28dB or over. 3. Ripple rejection ratio Adding CRIP, to ripple terminal 2 as shown in Figure 3, the ripple rejection ratio is improved from −25dΒ typ. to −45dΒ typ. 4. Power dissipation Care should be taken to use this IC below maximum power dissipation. Because it may over absolute maximum rating depending on operating condition. • TA7368PG PD = 900mW (Ta = 25°C) • TA7368FG PD = 400mW (Ta = 25°C) 5. Phase−compensation Small temperature coefficient and excellent frequency characteristic is needed by capacitors below. • Oscillation preventing capacitors for power amplifier output • Bypass capacitor for ripple filter • Capacitor between VCC and GND Fig.2 Vin + − Rf 90Ω 10Ω R4 R5 + 1 / 4 3 / 6 IN NF RIPPLE + CRIP 2 / 5 Fig.3 Fig.1 / 9 / 2 1 / 4 3 / 6 5 / 8 FROM PIN 7 / 10 : TA7368PG / TA7368FG D1 R5 Q1 Q4 Q2Q3 |
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