NE5561

Philips Semiconductors Product specification Switched-mode power supply control circuit NE/SE5561 DESCRIPTION The NE5561/SE5561 is a control circuit for use in switched-mode power supplies. It contains an internal temperature- compensated supply, PWM, sawtooth oscillator, overcurrent sense latch, and output stage. The device is intended for low cost SMPS applications where extensive housekeeping functions are not required. PIN CONFIGURATION D, FE, N Packages VCC VZ 1 2 3 4 8 7 6 5 GND OUTPUT CURRENT SENSE RT, CT FEATURES FEEDBACK GAIN Micro-miniature (D) package Pulse-width modulator Current limiting (cycle-by-cycle) Sawtooth generator Stabilized power supply Double pulse protection Internal temperature-compensated reference ORDERING INFORMATION DESCRIPTION 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Ceramic Dual In-Line Package (CERDIP) 8-Pin Small Outline (SO) Package Figure 1. Pin Configuration APPLICATIONS Switched-mode power supplies DC motor controller inverter DC/DC converter TEMPERATURE RANGE 0 to +70°C -55 to +125°C -55 to +125°C 0 to +70°C ORDER CODE NE5561N SE5561N SE5561FE NE5561D DWG # SOT97-1 SOT97-1 0580A SOT96-1 BLOCK DIAGRAM RT, CT 5 REF VOLTAGE SAWTOOTH GENERATOR VCC + ERROR AMP FEEDBACK 3 – PWM R GAIN 4 7 S LATCH OUTPUT 0.5V – STABILIZED SUPPLY 1 8 GND 8.2V 2 VZ CURRENT SENSE 6 + VCC SL00385 Figure 2. Block Diagram 1994 Aug 31 1 853-0889 13721 Philips Semicon...