Sunday, January 22, 2012
LM1758 A Switching Regulator Circuit
The National Semiconductor LM 1578 A is a switching regulator which can simply be created for such dc-to-dc voltage, conversion circuits as the buck, boost, and inverting configurations. The LM 1578 A features a unique comparator input stage that not only has separate pins for each the inverting and non-inverting inputs, however also provides an internal 1.0 V reference to every input, thereby simplifying circuit design and pc board layout.
The output can switch upto 750 m A and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal is also referenced to either the ground or the Vin terminal, relying upon the application. additionally, the LM 1578 A has an on board oscillator, that sets the switching frequency with one external capacitor from < 1 Hz to 100 kHz (typical). It operates from supply voltages of 2 V to 40 V. it's supplied with current limit and thermal shutdown. Duty cycle up to 90 %. functional diagram is given in figure.
The output can switch upto 750 m A and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal is also referenced to either the ground or the Vin terminal, relying upon the application. additionally, the LM 1578 A has an on board oscillator, that sets the switching frequency with one external capacitor from < 1 Hz to 100 kHz (typical). It operates from supply voltages of 2 V to 40 V. it's supplied with current limit and thermal shutdown. Duty cycle up to 90 %. functional diagram is given in figure.
Monday, January 16, 2012
100W Audio Amplifier with TDA7294
TDA7294 is an integrated, monolithic, Class AB audio amplifier designed precisely for Hi-Fi applications. The IC has a DMOS output stage and can deliver 100W RMS into an 8Ohm speaker at +/-38V dual supply.
In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. C8 is the input coupling capacitor and the input is applied to the non-inverting input (Pin3) of the IC. C3 and C9 are power supply filter capacitors although C10 and C4 are bypass capacitors. C2 is the bootstrap capacitor.
RC network comprising of R1 and C1 improves the high frequency stability of the amplifier and as well prevents oscillations. R2 and C6 sets the mute time constant while R3 and C5 sets the standby time constant. S1 the mute switch and S2 are the standby switch. R5 is the input resistance and the amplifiers input impedance has a direct relationship to its value. R4 and R6 is employed for setting type closed loop gain and With the used value, gain is 30dB. C2 is a DC decoupling.
In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. C8 is the input coupling capacitor and the input is applied to the non-inverting input (Pin3) of the IC. C3 and C9 are power supply filter capacitors although C10 and C4 are bypass capacitors. C2 is the bootstrap capacitor.
RC network comprising of R1 and C1 improves the high frequency stability of the amplifier and as well prevents oscillations. R2 and C6 sets the mute time constant while R3 and C5 sets the standby time constant. S1 the mute switch and S2 are the standby switch. R5 is the input resistance and the amplifiers input impedance has a direct relationship to its value. R4 and R6 is employed for setting type closed loop gain and With the used value, gain is 30dB. C2 is a DC decoupling.
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