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PDF U211B Data sheet ( Hoja de datos )
| Número de pieza | U211B | |
| Descripción | Phase Control IC | |
| Fabricantes | ATMEL Corporation | |
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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
Phase-
control 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
Frequency-
to-voltage
converter
Pulse blocking
tacho
monitoring
18*
9(8) 8(7)
4752C–INDCO–10/11
1 page  
Atmel U211B
4. Phase Control 1)
The phase angle of the trigger pulse is derived by comparing the ramp voltage (which is mains
synchronized by the voltage detector) with the set value on the control input pin 12. The slope of
the ramp is determined by C2 and its charging current. The charging current can be varied using
R2 on pin 6. The maximum phase angle αmax can also be adjusted by using R2.
When the potential on pin 7 reaches the nominal value predetermined at pin 12, a trigger pulse
is generated whose width tp is determined by the value of C2 (the value of C2 and hence the
pulse width can be evaluated by assuming 8µs/nF). At the same time, a latch is set, so that as
long as the automatic retriggering has not been activated, no more pulses can be generated in
that half cycle.
The current sensor on pin 1 ensures that, for operations with inductive loads, no pulse will be
generated in a new half cycle as long as a current from the previous half cycle is still flowing in
the opposite direction to the supply voltage at that instant. This makes sure that “gaps” in the
load current are prevented.
The control signal on pin 12 can be in the range of 0V to –7V (reference point pin 2).
If V12 = –7V, the phase angle is at maximum (αmax), i.e., the current flow angle, is at minimum.
The phase angle is minimum (αmin) when V12 = V2.
5. Voltage Monitoring 1)
As the voltage is built up, uncontrolled output pulses are avoided by internal voltage surveil-
lance. At the same time, all latches in the circuit (phase control, load limit regulation, soft start)
are reset and the soft-start capacitor is short circuited. Used with a switching hysteresis of
300mV, this system guarantees defined start-up behavior each time the supply voltage is
switched on or after short interruptions of the mains supply.
Note: 1. The descripten refers to the DIP18 package version which is no longer available.
4752C–INDCO–10/11
5
5 Page 
Atmel U211B
7.7 General Hints and Explanation of Terms 1)
To ensure safe and trouble-free operation, the following points should be taken into consider-
ation when circuits are being constructed or in the design of printed circuit boards.
• The connecting lines from C2 to pin 7 and pin 2 should be as short as possible. The
connection to pin 2 should not carry any additional high current such as the load current.
When selecting C2, a low temperature coefficient is desirable.
• The common (earth) connections of the set-point generator, the tacho generator and the final
interference suppression capacitor C4 of the f/V converter should not carry load current.
• The tacho generator should be mounted without influence by strong stray fields from the
motor.
• The connections from R10 and C5 should be as short as possible.
To achieve a high noise immunity, a maximum ramp voltage of 6V should be used. The typical
resistance Rϕ can be calculated from Iϕ as follows:
Rϕ(kΩ)
=
T-----(--m-----s---)----×-----1---.--1---3----(--V-----)---×-----1---0----3-
C(nF) × 6(V)
T=
Cϕ =
Period duration for mains frequency (10ms at 50Hz)
Ramp capacitor, maximum ramp voltage 6V and constant voltage drop at
Rϕ = 1.13V
A 10% lower value of Rϕ (under worst case conditions) is recommended.
Figure 7-2. Explanation of Terms in Phase Relationship
V
Mains
Supply
VGT
Trigger
Pulse
π/2 π 3/2π 2π
tp tpp = 4.5 tp
VL
Load
Voltage
L
Load
Current
ϕ
Φ
Note: 1. The descripten refers to the DIP18 package version which is no longer available.
4752C–INDCO–10/11
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet U211B.PDF ] | |
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