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U211B の電気的特性と機能

U211BのメーカーはATMEL Corporationです、この部品の機能は「Phase Control IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 U211B
部品説明 Phase Control IC
メーカ ATMEL Corporation
ロゴ ATMEL Corporation ロゴ 




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U211B Datasheet, U211B PDF,ピン配置, 機能
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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U211B pdf, ピン配列
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
3


3Pages


U211B 電子部品, 半導体
6. Soft Start 1)
As soon as the supply voltage builds up (t1), the integrated soft start is initiated. Figure 6-1
shows the behavior of the voltage across the soft-start capacitor, which is identical with the
voltage on the phase-control input on pin 12. This behavior guarantees a gentle start-up for the
motor and automatically ensures the optimum run-up time.
Figure 6-1. Soft Start
VC3
V12
V0
t1
t2
t3
ttot
t
t1 = Build-up of supply voltage
t2 = Charging of C3 to starting voltage
t1 + t2 Dead time
t3 = Run-up time
ttot = Total start-up time to required speed
C3 is first charged up to the starting voltage V0 with a current of typically 45µA (t2). By reducing
the charging current to approximately 4µA, the slope of the charging function is also substan-
tially reduced, so that the rotational speed of the motor only slowly increases. The charging
current then increases as the voltage across C3 increases, resulting in a progressively rising
charging function which accelerates the motor more and more with increasing rotational speed.
The charging function determines the acceleration up to the set point. The charging current can
have a maximum value of 55µA.
Note: 1. The descripten refers to the DIP18 package version which is no longer available.
6 Atmel U211B
4752C–INDCO–10/11

6 Page



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