Voltase hobby: TDA1562Q Audio Amplifier 50W

Saturday, August 30, 2014

TDA1562Q Audio Amplifier 50W

TDA1562Qgeneral description:

Philips designers have further improved a number of properties of the IC, among which the power output. According to the Philips datasheet, the improved device, the TDA1562Q, can deliver 70 watts into 4 ohms, but that is at the cost of the distortion, which at 10 per cent is rather too high, even for in a car. The prototype of the design described in this article provides 54 watts into 4 ohms at 1 per cent distortion. Since the number of requisite external components is smaller than in the case of the earlier device, the printed-circuit board is even more compact than that for the February 1995 amplifier.

TDA1562Q features:

Low power dissipation during reproduction of music signals

Proof against short-circuits

Protection against excessive temperatures

Standby switch

No power-on or power-off clicks

Visible error indication

Measurement results (at Ub=14.4 V)

Supply voltage 8–18 V

Sensitivity 760 mV r.m.s.

Input impedance 70 kΩ

Power output 54 W r.m.s. into 4 Ω (f=1 kHz; THD+N=1%)

Harmonic distortion (THD+) at 1 W into 4 Ω: 0.046% (1 kHz)0.29% 20Hz) at 35 W into 4 Ω: 0.12% (1 kHz) 0.7% (20 kHz)

Signal-to-noise ratio (with 1 W into 4 Ω) 88 dBA

Power bandwidth 7.5 Hz – 185 kHz (at 25 W into 4 Ω)

Quiescent current about 135 mA (‘on’)

TDA1562Q applications:

Television sets
Home-sound sets
Multimedia systems
All mains fed audio systems
Car audio (boosters).

TDA1562Q amplifer diagram:

TDA1562Q pcb:

TDA1562Q part lists:

R1= 1MΩ
R2 = 4kΩ7
R3 = 1kΩ
R4 = 100kΩ
Capacitors:
C1,C2 = 470nF
C3,C4 = 10µF 63V radial
C5,C6,C8 = 4700µF 25V radial
(18mm max. dia., raster 7.5 mm)
C7 = 100nF, raster 5 mm
Semiconductors:
D1 = high-efficiency-LED
IC1 = TDA1562Q (Philips)
Miscellaneous:
S1 = single-pole on/off switch
Four spade connectors, PCB mount
Heatsink for IC1 (Rth<2.5 K/W)
PCB, order code 000004-1 (see Readers Services pages)

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