DC453B-B

DC453B-B is a demonstration circuit featuring the LT1970A, a power amplifier with adjustable current limiting. The demo circuit is for applications with up to 5A of output current. For the 5A version a Class B MOSFET based current boost stage has been added to the output section with current limit control still provided by the LT1970A. The maximum output current of the board is set by two on-board potentiometers to permit independent control of the sinking and sourcing current limit. The current limit adjustment can also be provided by external voltage sources. Symmetrical sourcing and sinking current limit with a single control is also possible. LEDs provide an indication of faults detected by the LT1970A. Separate indicators illuminate when the amplifier enters sourcing or sinking current limit and if the LT1970A overheats and enters thermal shutdown protection.

• Single (8 to 36V) or dual (±8 to ±18V) power supplies
• Separate or common input stage and power output stage supplies
• AC or DC coupled inputs
• Non-inverting gains of 1 or 2, inverting gain of –1
• Separate or common current limit control
• Adjustable output current limit range from ±0.04 to ±5A (Boosted)
• 7.2KHz typ small signal -3dB bandwidth at AV= +1, Vout=200mVP-P, RLOAD=10 ohm
• 7KHz typ large signal -3dB bandwidth at AV= +1, Vout=10VP-P, RLOAD=10 ohm
• 1.6V/μS slew rate
• 12mA total quiescent supply current