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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
1 (9)

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U2350B-FP
2 (9)
Figure 2. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96

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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.
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
3 (9)