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U2350B-FP
PWM Speed Control for Permanent Excited DC Motors
Description
The monolithic integrated bipolar circuit U2350B is a
MOSFET or IGBT - control circuit which works on the
principle of pulse width modulation (PWM). The overall
concept enables the construction of a power controller
with mains voltage compensation where intermittent
operation is also possible. In addition, the circuit also
enables mains-voltage compensated current control,
which maintains the power supplied at a constant level
after the preset threshold has been exceeded.
Features
D Pulse width control up to 30 kHz clock frequency
D Mains supply compensation
D Current regulation
D Temperature monitoring with indicator
D Active operation indicator
D Blink-warn indicator
D Switchable to interval operation
D Push-pull output stage for separate supply
Block Diagram
21
LED control
D Supply voltage monitoring
D Temperature compensated supply voltage limitation
Applications
D Domestic equipment
D Tools
Package: SO16
+VS 16
Voltage limitation
GND
12
4 Temperature
monitoring
Output
control
Push– pull
output
15
14
8
6
7 Oscillator
PWM Control
13
10
9
5
Tristate
Program
logic
Figure 1. Block diagram
Current
limitation
11
95 10873
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
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U2350B-FP
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Figure 2. Block diagram with external circuit
TELEFUNKEN Semiconductors
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U2350B-FP
Pin Description
LED1 1
LED2 2
n.c. 3
NTC 4
Progr. 5
Rosc 6
Cosc 7
Contr. 8
16 +VS
15 OUT+
14 OUT
13 OUT–
12 GND
11 IContr.
10 S1
95 11409
9 VContr.
Pin Symbol
Function
1 LED1 LED output 1
2 LED2 LED output 2
3 n.c. Not connected
4 NTC Monitoring input
5 Progr. Tristate programing
6 Rosc Resistor for oscillator
7 Cosc Capacitor for oscillator
8 Contr. Control input
9 VContr. Voltage regulation input
10 S1 Switching output, output S1
11 IContr. Current regulation input
12 GND Ground
13 OUT– – supply for output stage
14 OUT Output
15 OUT+ + supply for output stage
16 +VS Supply voltage
Supply, Pin 16
Voltage Monitoring
The internal voltage limiter in the U2350B enables a
simple supply from the rectified line voltage. The supply
voltage between Pin 16 (+VS) and Pin 12 (ground) is built
up via R1 and is smoothed by C7. The typically 5 mA
supply current is simultaneously used to operate the two
LEDs D2, D3, which can both be bridged internally. The
supply current therefore reaches Pin 16 either via LEDs
or the internal switches (Vsat 1.2 V).
Series resistor, R1, can be calculated as follows:
+R1max
VMmin – VSmax
Itot
whereas
+VMmin Vmains –15%
+VSmax maximum supply voltage
+ )Itot ISmax Ix
+ISmax Max. current consumption of the IC
+Ix Current consumption of the external components
Here, C6 must be selected in this way that the voltage at
C7 (figure 2) is not noticeably affected by the load in any
mode of operation. For further information regarding
mains power supply, refer to figures 6 and 7.
Whilst the operating voltage is being built up or reduced,
uncontrolled output pulses of insufficient amplitude are
suppressed by the internal monitoring circuit. The latch
is also reset, the LED D2 (operating indicator) between
Pin 2 and Pin 16 is switched off and the control input
W“Pin 8” is connected to ground via switch S3 and a 1 k
resistor. In connection with a switching hysteresis of
approximately 2 V, this mode of operation guarantees
fail-safe start-up each time the operating voltage is
switched on, in the same way as after short mains
interruptions.
Connecting the control input Pin 8 with a capacitor can
therefore make a soft start with rapid recovery possible.
Pulse Width Control with Mains Voltage
Compensation, Pins 8, 9, 10
Average value of the voltage over the load is controlled
to an infinitely selectable value by the comparator
Comp. 1 with hysteresis. The rectified mains voltage is
divided by R3 and R4 and lead in Pin 10. The capacitor C1
is charged via R9 until the voltage V9, which is present at
the inverting input of Comp. 1, is more positive than the
control voltage V8 arriving at the non-inverting input via
an impedance converter. During the charge time, which
is dependent of the mains voltage, the pulse output is at
high potential and the switching output Pin 10 is open. If
V9 now becomes greater than V10, the output from
Comp. 1 switches over the output stage logic via an AND
gate.
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U2350B-FP
The output stage logic now brings V14 to low potential
and closes the switching output Pin 10. This has the effect
of discharging C1 via R9 and the switch S1 until the
approximately 300 mV hysteresis of the comparator is
completed. The discharge time is dependent on the
control voltage V8.
Comp. 1 then switches over again and the cycle begins
once more (see figure 3). This two-state controller
compensates the influence of the mains voltage, with the
result that the motor voltage or motor speed is largely
determined by the magnitude of the control voltage.
Current Control, Pin 11
If the current flowing through the IGBT (or MOSFET)
and the shunt resistor R8 becomes so high that a voltage
higher than 1.5 V arises at Pin 11, a second control loop
formed with the comparator Comp. 2 becomes active,
and overrides the first control loop via an AND gate. This
causes the average value of the current, fed to the motor,
to be controlled to a constant value. This in turn results in
a speed which decreases greatly with the increasing
torque (see figure 4).
V9
V10
V14
95 10869
t
Figure 3. Pulse width control signal characteristics
Speed
(of rotation)
V8
Imax
95 10870
Torque
Figure 4. Influence of current control on the characteristic
(curve) of a motor
By exceeding the maximum current which is adjustable
with R8, the control dependent voltage V8 (shunt
characteristic) reaches the dotted lines (series
characteristic). By applying a current which depends on
the load voltage across R6, the constant value of the
current can be further influenced. In addition, the current
control limits the starting current.
In the case of effective current limiting, alteration of the
rectified mains voltage has an effect on the power taken
up. In order to compensate for this influence, the resistor
R7 is connected to Pin 11. If dimensioned appropriately,
the consumed power is independent of changes in the
mains voltage within a wide range of this voltage.
Operation Mode Selection, Pin 5
It is possible to program three modes of operation with the
tristate input, as follows:
a) Intermittent operation (Pin 5 connected to +VS)
A signal emitted by an internal oscillator (see
figure 5) switches the output stage ON and OFF
periodically via S2. This intermittent operation is
very suitable for certain uses.
b) Stop function (Pin 5 open)
The output is continuously switched off, the motor is
at reset.
c) Normal function (Pin 5 connected to V12)
The motor runs continuously.
Temperature Monitoring, Pin 4
The circuit also has a monitoring input. If a NTC-resistor
is connected to this input, for example, it functions as a
temperature sensor. If the voltage V4 falls below the first
threshold VT80 (approximately 420 mV) as a result of the
increasing temperature, an external LED D3, which is
connected between Pin 1 and Pin 2, starts to blink. If the
temperature increases further and the voltage V4 falls
below a second threshold VT100 (approximately
350 mV), a latch is set. The latch makes this LED light up
continuously, the output stage is blocked. The motor is
switched-OFF and remains switched-OFF until the
temperature has fallen and until the mains voltage is
switched-OFF and switched-ON again (the latch is solely
reset by the voltage monitoring). A second LED D2,
which is connected between Pin 2 and Pin 16 and which
is continuously illuminated (switch-ON) during normal
operation, is switched-OFF.
In the event of wire breakage in the sensor branch, Pin 4
is pulled up to +VS. After the switch-OFF threshold
VTOFF (approximately VS–1.8 V) has been exceeded, the
circuit ensures that the latch is set here too. This
guarantees safe operation.
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Absolute Maximum Ratings
Reference point Pin 12, unless otherwise specified.
Parameters
Supply Current
t 10 ms
Pin 16
Push-pull output
V13 V14 V15, V15 V16, V13 V12
Output current
t 2 ms
Signal outputs
mInput current
t 10 s
Input currents
Pin 6, 8
Pin 10
Input voltages
Pin 4, 5, 7, 9, 10, 11
Storage temperature range
Junction temperature
Ambient temperature range
Symbol
IS
is
IO
io
II
ii
II
VI
Tstg
Tj
Tamb
U2350B-FP
Value
30
60
20
200
30
60
1
10
0 V to V16
–40 to +125
+125
–10 to +100
Unit
mA
mA
mA
mA
°C
°C
°C
Thermal Resistance
Junction ambient
Parameters
DIP16
SO16 on PC board
SO16 on ceramic
Symbol
RthJA
Value
120
180
100
Unit
K/W
K/W
K/W
Electrical Characteristics
VS = 15.5 V, Tamb = 25°C, reference point Pin 12, figure 2, unless otherwise specified.
Parameters
Supply voltage limitation
Current consumption
Voltage monitoring
Switch-on threshold
Switch-off threshold
Control input
Input voltage range
Input quiescent current
Impedance at lower voltage
Comparator 1
Input voltage range
Input quiescent current
Hysteresis
Delay time
Test Conditions / Pins
IS = 5 mA
IS = 20 mA
Pin 16
Pin 16
Pin 8
Pin 9
V8 = 1.5 V
Pin 8 – 9
Pin 9 –14
Symbol
VS
IS
VSON
VSOFF
VI
IIB
RI
VIC
IIB
Vhys
td
Min.
16.2
16.3
12.0
0
0
270
Typ.
14.0
12.5
1
300
Max.
17.2
17.8
3.5
14.5
7.5
250
7.5
250
330
3
Unit
V
mA
V
V
V
nA
kW
V
nA
mV
ms
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
5 (9)