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. 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. A single resistor between the C T 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 sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. The on-chip + 5.1 V reference is trimmed to ☑ % and the input common-mode range of the error amplifier includes the reference voltage eliminating external resistors. The SG3525A 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.
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