U211B

Features Internal Frequency-to-voltage Converter Externally Controlled Integrated Amplifier Overload Limitation with “Fold Back” Characteristic Optimized Soft-start Function Tacho Monitoring for Shorted and Open Loop Automatic Retriggering Switchable Triggering Pulse Typically 155mA Voltage and Current Synchronization Internal Supply-voltage Monitoring Temperature Reference Source Current Requirement ≤ 3mA 1. Description The integrated circuit Atmel® U211B is designed as a phase-control circuit in bipolar technology with an internal frequency-to-voltage converter. The device includes an internal control amplifier which means it can be used for speed-regulated motor applications. Amongst others, the device features integrated load limitation, tacho monitoring and soft-start functions, to realize sophisticated motor control systems. Figure 1-1. Block Diagram Phase Control IC with Overload Limitation for Tacho Applications Atmel U211B 17(16) 1(1) Voltage/current detector 11(10) 10(9) Control + amplifier - 14(13) 15(14) Load limitation speed/time controlled 5* Automatic retriggering Phasecontrol unit ϕ = f (V12) Output pulse 4(4) 6(5) 7(6) Supply voltage limitation 3(3) -VS 2(2) GND Reference 16(15) voltage Voltage monitoring Controlled current sink Soft start -VRef 12(11) 13(12) Pin numbers in brackets refer to SO16 *Pins 5 and 18 connected internally Frequencyto-voltage converter Pulse blocking tacho monitoring 18* 9(8) 8(7) 4752...