U211B.pdf 데이터시트 (총 30 페이지) - 파일 다운로드 U211B 데이타시트 다운로드

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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

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2. Pin Configuration
Figure 2-1. Pinning DIP18
Note: The DIP18 package is no longer available and has end-of-life status. For new developments
please use the SO16 package.
Isync 1
GND 2
VS 3
Output 4
Retr 5
VRP 6
CP 7
F/V 8
CRV 9
U211B
18 PB/TM
17 Vsync
16 VRef
15 OVL
14 Isense
13 Csoft
12 CTR/OPO
11 OP+
10 OP
Table 2-1.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Pin Description
Symbol Function
Isync
GND
Current synchronization
Ground
VS
Output
Supply voltage
Trigger pulse output
Retr Retrigger programming
VRP Ramp current adjust
CP Ramp voltage
F/V Frequency-to-voltage converter
CRV Charge pump
OP- OP inverting input
OP+
OP non-inverting input
CTR/OPO Control input/OP output
Csoft
Isense
OVL
Soft start
Load-current sensing
Overload adjust
VRef
Vsync
PB/TM
Reference voltage
Voltage synchronization
Pulse blocking/tacho monitoring
2 Atmel U211B
4752C–INDCO–10/11

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Figure 2-2. Pinning SO16
Isync 1
GND 2
VS 3
Output 4
VRP 5
CP 6
F/V 7
CRV 8
U211B
16 Vsync
15 VRef
14 OVL
13 Isense
12 Csoft
11 CTR/OPO
10 OP+
9 OP
Table 2-2.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Description
Symbol Function
Isync
GND
Current synchronization
Ground
VS
Output
Supply voltage
Trigger pulse output
VRP Ramp current adjust
CP Ramp voltage
F/V Frequency-to-voltage converter
CRV Charge pump
OP- OP inverting input
OP+
OP non-inverting input
CTR/OPO Control input/OP output
Csoft
Isense
OVL
Soft start
Load-current sensing
Overload adjust
VRef
Vsync
Reference voltage
Voltage synchronization
Atmel U211B
4752C–INDCO–10/11
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3. Mains Supply 1)
The Atmel® U211B is equipped with voltage limiting and can therefore be supplied directly from
the mains. The supply voltage between pin 2 (+ pol/_|_) and pin 3 builds up across D1 and R1
and is smoothed by C1. The value of the series resistance can be approximated using:
R1
=
V-----M-----–-----V----S--
2 IS
Further information regarding the design of the mains supply can be found in the section “Design
Hints 1)” on page 10. The reference voltage source on pin 16 of typically –8.9V is derived from
the supply voltage and is used for regulation.
Operation using an externally stabilized DC voltage is not recommended.
If the supply cannot be taken directly from the mains because the power dissipation in R1 would
be too large, the circuit as shown in Figure 3-1 should be used.
Figure 3-1. Supply Voltage for High Current Requirements
~
24V~
12345
+
C1
R1
Note: 1. The descripten refers to the DIP18 package version which is no longer available.
4 Atmel U211B
4752C–INDCO–10/11

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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
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