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Partner products Quick links The SGA series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock.
A single resistor between the CT and the discharge terminals provide a wide range of dead time ad- justment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuity 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.
These functions are also controlled by an undervoltage lockout which keeps the outputs off and the soft-start capacitor discharged for sub-normal input voltages. This lockout circuitry includes approximately mV of hysteresis for jitter-free operation. Another feature of these PWM circuits is a latch following the comparator. Once a PWM pulses has been terminated for any reason,the outputs will remain off for the duration of the period.
The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of mA.
KA3525A Fairchild Semiconductor, KA3525A Datasheet
KA3525A Fairchild Semiconductor, KA3525A Datasheet - Page 4
KA3525A Fairchild Semiconductor, KA3525A Datasheet - Page 3