Product Name: Analog ICS OPAMPS UA741 OPAMP
Model: UA741
Brand: OPAMPS
Origin: China
Condition: New
The UA741 OPAMP pulse width modulator control circuit offers
improved performance and lower external parts count when implemented for
controlling all types of switching power supplies. The on−chip +5.1 V reference
is trimmed to 1% and the error amplifier has an input common−mode voltage range
that includes the reference voltage, thus eliminating the need for external
divider resistors. A sync input to the oscillator enables multiple units to be
slaved or a single unit to be synchronized to an external system clock. A wide
range of dead time can be programmed by a single resistor connected between the
CT and Discharge pins. This device also features built−in soft−start circuitry,
requiring only an external timing capacitor. A shutdown pin controls both the
soft−start circuitry and the output stages, providing instantaneous turn off
through the PWM latch with pulsed shutdown, as well as soft−start recycle with
longer shutdown commands. The under voltage lockout inhibits the outputs and
the changing of the soft−start capacitor when VCC is below nominal. The output
stages are totem−pole design capable of sinking and sourcing in excess of 200
mA. The output stage of the SG3525A features NOR logic resulting in a low
output for an off−state.
