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 low‑cost switched‑mode power supply applications. It integrates a temperature‑compensated reference, PWM, sawtooth oscillator, over‑current sense latch and output stage. The device is offered in several 8‑pin packages (DIP, CERDIP, SO) and supports both voltage‑forced and current‑fed operation.
Key specifications include a +18 V forced‑mode supply voltage, 40 mA maximum output current, 1.4 V output voltage, 98 % duty‑cycle capability and a 0.75 W power‑dissipation limit. The SE5561 version operates from –55 °C to +125 °C, while the NE5561 version covers 0 °C to +70 °C. Typical performance curves and start‑up guidelines are provided for designing reliable power converters.
| Supply voltage (forced mode) | +18 V |
|---|---|
| Output current | 40 mA |
| Output voltage | 1.4 V |
| Output duty cycle | 98 % |
| Maximum total power dissipation | 0.75 W |
| Operating temperature range (SE5561) | -55 °C to +125 °C |
It is a control circuit for use in switched‑mode power supplies.
The device is offered in D, FE and N 8‑pin packages, including plastic DIP, ceramic DIP and small‑outline (SO) versions.
The maximum output current is 40 mA.
The SE5561 operates from –55 °C to +125 °C.