![]() ![]() But the Pulse frequency modulation technique causes some issues in switch-mode power supplies. In Pulse frequency modulation technique on time of pulse remains constant but the frequency increases with the increase in load. Regulating Pulse Width Modulators 16-SOIC 0 to 70Ġ.Control-Integrated circuit for SMPS SG3525: Pulse frequency modulation and pulse width modulation are two types of techniques used in control integrated circuits for switch-mode power supplies. Switching Controller, Voltage-mode, 0.5A, 500kHz Switching Freq-Max, BIPolar, PQCC20, PLASTIC, LCC-20Įnhanced 35V, Dual 0.4A 400KHz PWM controller with Low output when off, 0C to 70C 16-SOIC 0 to 70 Regulating Pulse Width Modulators 16-SOIC -25 to 85Ġ.5A SWITCHING CONTROLLER, 400kHz SWITCHING FREQ-MAX, PDSO16, PLASTIC, SO-16Ġ.5A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20Ġ.5A SWITCHING CONTROLLER, 400kHz SWITCHING FREQ-MAX, PQCC20, GREEN, PLASTIC, LCC-20 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.Ġ.5A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PQCC20, GREEN, PLASTIC, LCC-20 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 deadtime can be programmed by a single resistor connected between the CT and Discharge pins. The SG3525A 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. ![]()
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