CA1523

DC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Supply Current
_(MAX). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .±50mA
_(MAX), 1s,1800pF Load . . . . . . . . . . . . . . .. . +300, -200mA
Device Dissipation
Up to T_A = 70 . . . . . . . . . . . . . . . . . . . . . . . .  . . . . . . 530mW
Above T_A = 70. . . . . . . . . . . . .. . Derate Linearly at 6.7mW/

The CA1523 monolithic silicon integrated circuit is a variable interval pulse regulator designed to provide the control circuitry for use in switching regulator circuits. It operates from 11V to 15V.

The regulator provides a single output drive capable of 300mA source/200mA sink. The maximum operating frequency is better than 200kHz. An attractive feature of the CA1523 is that the timing capacitor charge and discharge current is set up externally via a single resistor. The ratio of charge to discharge current is internally set at a maximum of 2 to 1 allowing simultaneous change in output pulse width with increased frequency at higher load. The pulse width variation at higher frequencies effectively compensates for the losses in magnetics and thereby increases the power supply efficiency at higher load end by as much as 20 percent.