70 W high efficiency power amplifier with diagnostic facility

INTEGRATED CIRCUITS DATA SHEET TDA1562Q 70 W high efficiency power amplifier with diagnostic facility Preliminary specification File under Integrated Circuits, IC01 1998 Apr 07 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility FEATURES • Very high output power, operating from a single low supply voltage • Low power dissipation, when used for music signals • Switches to low output power at too high case temperatures • Few external components • Fixed gain • Differential inputs with high common mode rejection • Mode select pin (on, mute and standby) • Status I/O pin (class-H, class-B and fast mute) • All switching levels with hysteresis • Diagnostic pin with information about: – Dynamic Distortion Detector (DDD) – Any short-circuit at outputs – Open load detector – Temperature protection. • No switch-on or switch-off plops GENERAL DESCRIPTION • Fast mute on supply voltage drops TDA1562Q • Quick start option (e.g. car-telephony/navigation) • Low (delta) offset voltage at the outputs • Load dump protection • Short-circuit safe to ground, supply voltage and across the load • Low power dissipation in any short-circuit condition • Protected against electrostatic discharge • Thermally protected • Flexible leads. The TDA1562Q is a monolithic integrated 70 W/4 Ω Bridge-Tied Load (BTL) class-H high efficiency power amplifier in a 17-lead DIL-bent-SIL plastic power package. The device can be used for car audio systems (e.g. car, radio and boosters) as well as mains fed applications (e.g. midi/mini audio combinations and TV sound). QUICK REFERENCE DATA Test conditions: VP = 14.4 V; RL = 4 Ω; Rs = 0 Ω; f = 1 kHz; Tamb = 25 °C; unless otherwise specified. SYMBOL VP PARAMETER supply voltage CONDITIONS operating non-operating load dump Iq(tot) Istb VOO ∆VOO Gv Zi(dif) Po THD total quiescent current standby current output offset voltage delta output offset voltage voltage gain differential input impedance output power total harmonic distortion THD = 0.5% THD = 10% Po = 1 W Po = 20 W DDD active SVRR CMRR ISRR Vn(o) supply voltage ripple rejection common mode rejection ratio input signal rejection ratio noise output voltage on and mute on mute on on and mute; RL = open circuit standby on and mute on ↔ mute 8 − − − − − − 25 90 45 60 − − − 60 70 80 − MIN. − − 110 1 − − 26 150 55 70 0.03 0.06 10 70 80 90 100 TYP. 14.4 MAX. 18 30 45 150 50 100 30 27 − − − − − − − − − 150 V V V mA µA mV mV dB kΩ W W % % % dB dB dB µV UNIT 1998 Apr 07 2 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility ORDERING INFORMATION PACKAGE TYPE NUMBER NAME TDA1562Q BLOCK DIAGRAM DBS17P DESCRIPTION TDA1562Q VERSION SOT243-1 plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) handbook, full pagewidth C1− 3 CLASS-B CLASS-H FAST MUTE STANDBY MUTE ON C1+ 5 VP1 9 VP2 10 status I/O 16 TEMPERATURE SENSOR LOAD DUMP PROTECTION mode select 4 disable LIFT-SUPPLY CURRENT PROTECTION VP* IN+ 1 + PREAMP − POWERSTAGE DIAGNOSTIC INTERFACE FEEDBACK CIRCUIT 75 kΩ IN− 2 7 OUT+ 75 kΩ TDA1562Q LOAD DETECTOR DYNAMIC DISTORTION DETECTOR 8 diagnostic − PREAMP + POWERSTAGE VP* LIFT-SUPPLY TEMPERATURE PROTECTION 11 OUT− Vref 14 15 kΩ disable signal 17 GND reference voltage MGL264 15 C2− 13 C2+ 6 PGND1 12 PGND2 Fig.1 Block diagram. 1998 Apr 07 3 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility PINNING SYMBOL IN+ IN− C1− MODE C1+ PGND1 OUT+ DIAG VP1 VP2 OUT− PGND2 C2+ Vref C2− STAT SGND PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 DESCRIPTION signal input (positive) signal input (negative) negative terminal of lift electrolytic capacitor 1 mode select input positive terminal of lift electrolytic capacitor 1 power ground 1 positive output diagnostic output (open collector) supply voltage 1 supply voltage 2 negative output power ground 2 positive terminal of lift electrolytic capacitor 2 internal reference voltage negative terminal of lift electrolytic capacitor 2 status I/O signal ground OUT+ 7 DIAG 8 VP1 9 VP2 10 OUT− 11 PGND2 12 C2+ 13 Vref 14 C2− 15 STAT 16 SGND 17 MGL263 TDA1562Q handbook, halfpage IN+ 1 IN− 2 C1− 3 MODE 4 C1+ 5 PGND1 6 TDA1562Q Fig.2 Pin configuration. 1998 Apr 07 4 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility FUNCTIONAL DESCRIPTION The TDA1562Q contains a mono class-H BTL output power amplifier. At low output power, up to 18 W, the device operates as a normal BTL amplifier. When a larger output voltage swing is required, the internal supply voltage is lifted by means of the external electrolytic capacitors. Due to this momentarily higher supply voltage the obtainable output power is 70 W. In normal use, when the output is driven with music-like signals, the high output power is only needed during a small percentage of time. Under the assumption that a music signal has a normal (Gaussian) amplitude distribution, the reduction in dissipation is about 50% when compared to a class-B output amplifier with the same output power. The heatsink should be designed for use with music signals. If the case temperature exceeds 120 °C, the device will switch back from class-H to class-B operation. The high power supply voltage is then disabled and the output power is limited to 20 W. When the supply voltage drops below the minimum operating level, the amplifier will be muted immediately. Mode select input (pin MODE) This pin has 3 modes: 1. LOW, ‘standby’: the complete circuit is switched off, the supply current is very low 2. MID, ‘mute’: the circuit is switched on, but the input signal is suppressed 3. HIGH, ‘on’: normal operation, the input signal is amplified by 26 dB. When the circuit is switched from mute to on or vice versa the actual switching takes place at a zero crossing of the input signal. The circuit contains a quick start option, i.e. when it is switched directly from standby to on, the amplifier is fully operational within 50 ms (important for applications like car telephony and car navigation). Status I/O input (pin STAT) INPUT This input has 3 possibilities: TDA1562Q 1. LOW, ‘fast mute’: the circuit remains switched on, but the input signal is suppressed 2. MID, ‘class-B’: the circuit operates as class-B amplifier, the high power supply voltage is disabled, independent of the case temperature 3. HIGH, ‘class-H’: the circuit operates as class-H amplifier, the high power supply voltage is enabled, independent of the case temperature. When the circuit is switched from fast mute to class-B/H or vice versa the switching is immediately carried out. When the circuit is switched from class-B to class-H or vice versa the actual switching takes place at a zero crossing of the input signal. OUTPUT This output has 3 possibilities: 1. LOW, ‘mute’: acknowledge of muted amplifier 2. MID, ‘class-B’: the circuit operates as class-B amplifier, the high power supply voltage is disabled, caused by the case temperature Tc > 120 °C 3. HIGH, ‘class-H’: the circuit operates as class-H amplifier, the high power supply voltage is enabled, because the case temperature Tc < 120 °C. When the circuit is switched from class-B to class-H or vice versa the actual switching takes place at a zero crossing of the input signal. The status I/O pins of maximum 8 devices may be tied together for synchronizing purposes. 1998 Apr 07 5 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility TDA1562Q handbook, full pagewidth on mute 0 HIGH supply voltage mode select input MID LOW Vref reference voltage VRT 0 HIGH status I/O input MID LOW HIGH status I/O output MID LOW class-H (Tc < 120 °C) class-B (Tc > 120 °C) output voltage across load 0 quick start mute zerocross change class B/H-operation fast mute function zerocross mute function supply mute function MGL272 Fig.3 Switching characteristics. 1998 Apr 07 6 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility Diagnostic output (pin DIAG) DYNAMIC DISTORTION DETECTOR (DDD) At the onset of clipping of the output stages, the DDD becomes active. This information can be used to drive a sound processor or DC-volume control to attenuate the input signal and so limit the distortion. SHORT-CIRCUIT PROTECTION When a short-circuit occurs at the outputs to ground or to the supply voltage, the output stages are switched off. They will be switched on again approximately 20 ms after removing the short-circuit. During this short-circuit condition the diagnostic output is continuously LOW. When a short-circuit occurs across the load, the output stages are switched off during approximately 20 ms. After that time is checked during approximately 50 µs whether the short-circuit is still present. During this short-circuit condition the diagnostic output is LOW for 20 ms and high for 50 µs. The power dissipation in any short-circuit condition is very low. TEMPERATURE DETECTION TDA1562Q Just before the temperature protection becomes active the diagnostic output becomes continuously LOW. Load detection: directly after the circuit is switched from standby to mute or on, a build in detection circuit checks whether a load is present. The results of this check can be detected at the diagnostic output, by switching the mode select input in the mute mode. Since the diagnostic output is an open collector output, more devices can be tied together. HIGH handbook, full pagewidth mode select input MID LOW output voltage across load 0 HIGH diagnostic output no load LOW t clipping signal short-circui