The U211B is a bipolar phase control IC with an internal frequency-to-voltage converter, which can be used for speed-regulated motor applications. The device also features integrated load limitation, tacho monitoring and soft-start functions to realize sophisticated motor control systems.
The U211B is a phase‑control integrated circuit designed for speed‑regulated motor applications. It includes an internal frequency‑to‑voltage converter, overload limitation with fold‑back characteristic, soft‑start, tacho monitoring, and automatic retriggering. The device operates from a mains supply and offers voltage and current synchronization.
The document details pin assignments for DIP‑18 and SO‑16 packages, explains the mains supply circuit, phase‑control operation, soft‑start behavior, frequency‑to‑voltage conversion, pulse blocking, control amplifier characteristics, and load‑limitation circuitry. Revision history and Atmel contact information are also provided.
| Current Requirement | 3 mA |
|---|---|
| Triggering Pulse Current | 155 mA |
| Reference Voltage (pin 16) | -8.9 V (typical) |
| Initial Charging Current (Cz) | 45 µA (typical) |
| Maximum Charging Current | 55 A |
| Voltage‑monitoring Switch‑on Threshold | -100 mV |
| Voltage‑monitoring Switch‑off Threshold | -50 mV |
The typical triggering pulse current is 155 mA.
The reference voltage on pin 16 is typically –8.9 V.
Yes, the U211B has voltage limiting and can be supplied directly from the mains.
The device requires a current of 3 mA.