U211B データシートの表示（PDF） - Atmel Corporation

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U211B

Phase Control IC with Overload Limitation for Tacho Applications

Atmel Corporation 

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 155 mA

• Voltage and Current Synchronization

• Internal Supply-voltage Monitoring

• Temperature Reference Source

• Current Requirement ≤3 mA

1. Description

The integrated circuit U211B is designed as a phase-control circuit in bipolar technol-

ogy 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

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

Phase-

control unit

ϕ = f (V12)

Output

4(4)

pulse

6(5)

7(6)

Supply

voltage

limitation

Reference

voltage

Voltage

monitoring

3(3)

-VS

2(2)

GND

16(15)

Phase Control

IC with

Overload

Limitation

for Tacho

Applications

U211B

Controlled

current sink

Soft start

-VRef

Frequency- Pulse-blocking

to-voltage

tacho

converter

monitoring

18*

12(11)

13(12) 9(8) 8(7)

Pin numbers in brackets refer to SO16

* Pins 5 and 18 connected internally

Rev. 4752B–INDCO–09/05

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