MC3456P ON Semiconductor, MC3456P Datasheet - Page 10

• Manufacturer Part Number: MC3456P
• Manufacturer: ON Semiconductor

Specifications of MC3456P

• Lead Free Status / Rohs Status: Not Compliant

Pulse Width Modulation
monostable mode of operation, the charge time of the
capacitor can be varied by changing the control voltage at
Pin 3. In this manner, the output pulse width can be
modulated by applying a modulating signal that controls the
threshold voltage.
Threshold
Discharge
9.1 k
If the timer is triggered with a continuous pulse train in the
1.0 μF
Figure 22. Pulse Width Modulation Waveforms
Trigger
V
CC
MC3456
(R
1/2
A
Modulation Input Voltage 5.0 V/cm
= 10 kW, C = 0.02 mF, V
Clock Input Voltage
Capacitor Voltage
Reset
Gnd
Output Voltage
t = 0.5 ms/cm
Control
Output
5.0 V/cm
5.0 V/cm
5.0 V/cm
0.01 μF
Load
0.001 μF
27 k
CC
= 15 V)
Figure 24. Sequential Timing Circuit
9.1 k
Threshold
Discharge
5.0 μF
Trigger
http://onsemi.com
V
MC3456
CC
1/2
Gnd
10
Reset
Test Sequences
sequential timing. An example is shown in Figure 24 where
the sequence is started by triggering the first timer which
runs for 10 ms. The output then switches low momentarily
and starts the second timer which runs for 50 ms and so forth.
Control
Output
Several timers can be connected to drive each other for
0.01 μF
Load
0.001 μF
Clock
Output
Input
Figure 23. Pulse Width Modulation Circuit
27 k
R
L
Discharge
Threshold
Output
Trigger
50 k
+V
5 (9)
5.0 μF
6 (8)
Trigger
CC
Reset
4 (10)
(5.0 V to 15 V)
Gnd
MC3456
V
CC
MC3456
1/2
1/2
V
CC
7
Gnd
14
Reset
Discharge
1 (13)
Threshold
2 (12)
Control
3 (11)
Control
Output
0.01 μF
V
CC
Load
(5.0 V to 15 V)
Modulation
R
A
Input
C