NTE1723 Datasheet | NTE Electronics

Description : The NTE1721 and NTE1723 are pulse width modulator control- circuits designed to offer improved performance and lowered external parts count when implemented for controlling all types of switching power supplies. The no- chip +5.1V reference is trimmed to ±1% and the input mon- mode range of the errror amplifier 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 the Discharge pins. These devices also feature a built- in soft- start circuitry, requiring only an external timing capacitor. A shutdown pin controls both the soft- start circuitry and the output stages, provided instantaneous turn- off through the PWM latch with pulsed shutdown, as well as soft- start recycle with longer shutdown mands. 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 200m A. The output stages of the NTE1721 features NOR logic resulting in a low output for an off state while the NTE1723 utilizes OR logic which gives a high output when off. Features : D 8V to 35V Operation D +5.1V ±1% Trimmed Reference D 100Hz to 400k Hz Oscillator Range D Separate Oscillator Sync Pin D Adjustable Dead Time Control D D D D Input Undervoltage Lockout Latching PWM to Prevent Multiple Pulses Pulse- by- Pulse Shutdown Dual Source/Sink Outputs: ±400m A Peak Absolute Maximum Ratings: (Note 1) Supply Voltage, VCC - - - - - - - - - - - - . . +40V Collector Supply Voltage, VC - - - - - - - - - - - . +40V Logic Inputs . . ....