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.
The NE/SE5561 is a control circuit designed for switched‑mode power supplies. It integrates a temperature‑compensated reference, PWM, sawtooth oscillator, over‑current sense latch, and an output stage, targeting low‑cost SMPS applications where extensive housekeeping functions are not required.
Key features include a micro‑miniature D‑package, cycle‑by‑cycle current limiting, double‑pulse protection, and a built‑in stabilized supply. Typical applications cover SMPS, DC motor controller inverters, and DC‑DC converters. The datasheet details absolute maximum ratings, electrical characteristics, pin configuration, and recommended start‑up circuitry.
| Supply voltage (forced mode) | +18 V |
|---|---|
| Supply current (current‑fed mode) | 30 mA |
| Output current | 40 mA |
| Output voltage | 1.4 V |
| Output duty cycle | 98 % |
| Maximum power dissipation | 0.75 W |
| Operating temperature range (NE5561) | 0 °C to +70 °C |
| Operating temperature range (SE5561) | -55 °C to +125 °C |
| Frequency range | 50‑100 kHz |
| Open‑loop gain | 60 dB |
| Feedback resistor | 10 kΩ |
| Small‑signal bandwidth | 3 MHz |
The NE5561 operates from 0 °C up to +70 °C.
The device can deliver up to 40 mA of output current.