STA540 4 x 13 W dual/quad power amplifier Datasheet production data Features High output power capability 2x 38 W into 4 at 18 V, 1 kHz, 10% THD 2x 34 W into 8 at 22 V, 1 kHz, 10% THD 2x 24W into 4 at 14.4 V, 1 kHz, 10% THD 2x 15 W into 8 at 16 V, 1 kHz, 10% THD 4x 13 W into 2 at 15 V, 1 kHz, 10% THD 4x 11 W into 4 at 18 V, 1 kHz, 10% THD 4x 7 W into 4 at 14.4 V, 1 kHz, 10% THD Multiwatt15 Minimum external components count: no bootstrap capacitors no Boucherot cells internally fixed gain 20 dB Standby function (CMOS compatible) Description No audible pop during standby operations Diagnostic facilities: The STA540 is a 4-channel, class-AB audio clip detector amplifier designed for high quality sound applications. output to GND short-circuit detector output to VS short-circuit detector The amplifiers have single-ended outputs with soft short-circuit check at turn-on integrated short-circuit protection, thermal protection and diagnostic functions. thermal shutdown warning The chip is housed in the 15-pin Multiwatt Protection ECOPACK Pb-free package which is RoHS Output AC/DC short circuit (2002/95/EC) compliant. Soft short-circuit check at turn-on Thermal cutoff/limiter to prevent chip from overheating High inductive loads ESD Table 1. Device summary Order code Temperature range Package Packing STA540 -40 to 150 C Multiwatt15 Tube April 2012 Doc ID 13907 Rev 6 1/25 This is information on a product in full production. www.st.com 1Contents STA540 Contents 1 Block diagram and pin description . 6 1.1 Block diagram . 6 1.2 Pin description 7 2 Electrical specifications 8 2.1 Absolute maximum ratings . 8 2.2 Thermal data . 8 2.3 Electrical characteristics . 8 3 Standard application circuits . 10 4 Electrical characteristics curves 12 5 Thermal information 15 5.1 Heatsink specification examples . 15 5.1.1 R calculation for 4 single-ended channels . 15 th HS 5.1.2 R calculation for 2 single-ended channels plus 1 BTL channel . 15 th HS 5.1.3 Calculations using music power . 16 6 Practical information 17 6.1 Highly flexible amplifier configuration 17 6.2 Easy single-ended to bridge transition . 17 6.3 Internally fixed gain . 17 6.4 Silent turn on/off and muting/standby function . 17 6.5 Driving circuit for standby mode 17 6.6 Output stage . 18 6.6.1 Rail-to-rail output voltage swing without bootstrap capacitors 18 6.6.2 Absolute stability without external compensation . 18 6.7 Builtin protection . 19 6.7.1 Diagnostic facilities (pin 10) 19 6.7.2 Short-circuit protection 19 6.7.3 Clipping detection . 20 6.7.4 Thermal shutdown . 20 2/25 Doc ID 13907 Rev 6