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TDA1521A 데이터시트(PDF) 4 Page - NXP Semiconductors |
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4 / 15 page July 1994 4 Philips Semiconductors Product specification 2 x 6 W hi-fi audio power amplifier TDA1521A PINNING FUNCTIONAL DESCRIPTION This hi-fi stereo power amplifier is designed for mains fed applications. The circuit is designed for both symmetrical and asymmetrical power supply systems. An output power of 2 × 6 watts (THD = 0,5%) can be delivered into an 8 Ω load with a symmetrical power supply of ± 12 V. The gain is fixed internally at 30 dB. Internal gain fixing gives low gain spread and very good balance between the amplifiers (0,2 dB). A special feature of this device is a mute circuit which suppresses unwanted input signals during switching on and off. Referring to Fig.12, the 100 µF capacitor creates a time delay when the voltage at pin 3 is lower than an internally fixed reference voltage. During the delay the amplifiers remain in their DC operating mode but are isolated from the non-inverting inputs on pins 1 and 9. Two thermal protection circuits are provided, one monitors the average junction temperature and the other the instantaneous temperature of the power transistors. Both protection circuits activate at 150 °C allowing safe operation to a maximum junction temperature of 150 °C without added distortion. RATINGS Limiting values in accordance with the Absolute Maximum System (IEC 134) Note 1. For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to VP = 28 V. 1 −INV1 non-inverting input 1 5 −V P negative supply (symmetrical) 2 INV1 inverting input 1 ground (asymmetrical) 3 GND ground (symmetrical) 6 OUT2 output 2 1 ⁄2 VP (asymmetrical) 7 + VP positive supply 4 OUT1 output 1 8 INV2 inverting input 2 9 −INV2 non-inverting input 2 PARAMETER CONDITIONS SYMBOL MIN. MAX. UNIT Supply voltage pin 7 VP = V7-3 − +21 V pin 5 −VP = V5-3 −−21 V Non-repetitive peak output current pins 4 and 6 IOSM − 4A Total power dissipation see Fig.2 Ptot Storage temperature range Tstg −55 + 150 °C Junction temperature Tj − 150 °C Short-circuit time: see note 1 outputs short-circuited to ground symmetrical (full signal drive) power supply tsc − 1 hour asymmetrical power supply tsc − 1 hour |
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