A shutdown terminal controls both the soft-start circu- ity and the output stages, providing instantaneous turn off through the PWM latch with pulsed shut- down, as well as soft-start recycle with longer shut- down commands. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A single resistor between the CT and the discharge terminals provide a wide range of dead time ad- justment. A sync input to the oscillator al- lows 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 ± 1 % and the input common-mode range of the error amplifier includes the reference voltage eliminating external resistors. The SG3525A series of pulse width modulator inte- grated circuits are designed to offer improved per- formance and lowered external parts count when used in designing all types of switching power sup- plies. INPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
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