U211B Datasheet, PDF (1/30 Pages) ATMEL Corporation – Phase Control IC with Overload Limitation for Tacho Applications

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
-V_Ref
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