DC volume control? Few external components? Mute mode? Thermal protection?
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DC volume control? Few external components? Mute mode? Thermal protection? Short-circuit proof? No switch-on and switch-off clicks? Good overall stability? Low power consumption? Low HF radiation? ESD protected on all pins. It is designed for use in TV and monitors, but is also suitable for battery-fed portable recorders and radios. The device is contained in a 9-pin medium power package. The MCL circuit is activated when the difference in current between the output terminal of each amplifier exceeds mA mA typ.
This level of mA allows for headphone applications single-ended. In conventional DC volume circuits the control or input stage is AC coupled to the output stage via external capacitors to keep the offset voltage low. In the TDAB the DC volume control stage is integrated into the input stage so that no coupling capacitors are required. With this configuration, a low offset voltage is still maintained and the minimum supply voltage remains low.
The BTL principle offers the following advantages:? Lower peak value of the supply current? The frequency of the ripple on the supply voltage is twice the signal frequency. Consequently, a reduced power supply with smaller capacitors can be used which results in cost reductions.
For portable applications there is a trend to decrease the supply voltage, resulting in a reduction of output power at conventional output stages. Using the BTL principle increases the output power. The DC volume control stage has a logarithmic control characteristic. Therefore, the total gain can be controlled from If the DC volume control voltage falls below 0. The amplifier is short-circuit proof to ground, VP and across the load. Also a thermal protection circuit is implemented.
Special attention is given to switch-on and switch-off clicks, low HF radiation and a good overall stability. UNIT 18 13? With a load connected to the outputs the quiescent current will increase, the maximum value of this increase being equal to the DC output offset voltage divided by RL.
The DC volume control can be configured in several ways. Two possible circuits are shown in Figs 14 and The circuits at the volume control pin will influence the switch-on and switch-off behaviour and the maximum voltage gain. Frequency range is 22 Hz to 22 kHz. The maximum output power is limited by the maximum power dissipation and the maximum available output current.
F electrolytic capacitor is connected close to pin 2. For single-end application the output peak current may not exceed mA; at higher output currents the short circuit protection MLC will be activated. Plastic or metal protrusions of 0. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board.
However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. The total contact time of successive solder waves must not exceed 5 seconds.
If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. Repairing soldered joints Apply a low voltage soldering iron less than 24 V to the lead s of the package, below the seating plane or not more than 2 mm above it. This data sheet contains target or goal speci? This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains?
Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the speci? Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the speci?
Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. Box , Tel. VB, Tel. Salcedo Village, P. Box Johannesburg , Tel. RICH, Tel. Philips Electronics N. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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