U2400B データシートの表示（PDF） - Temic Semiconductors
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U2400B Datasheet PDF : 15 Pages
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U2400B
Pulse Width Modulation (PWM)
There are two separate inputs to PWM comparator.
Positive lead is available at Pin 2, whereas negative lead
is connected directly to the oscillator as shown in figure 9.
A DC voltage in the range of 0.9 to 2.1 V at the compara-
tor input Pin 2, switches-off the charge and discharge
outputs, when the oscillator ramp voltage at Pin 3 has a
higher value than the applied voltage at Pin 2.
The PWM is operating independently of discharge,
charge or trickle mode. The effective current requirement
for the different battery types of same voltage can be
maintained by voltage ratio given below:
Programming Inputs
Pin 14
The internal clock signal can be derived either from the
mains sync. circuit or from the autonomous oscillator.
Internal oscillator clock disconnection is achieved with
Pin 14 (figure 7).
Oscillator clock disconnected, when Pin 14 is connected
to Pin 7 (ref.).
Oscillator clock connected, when Pin 14 is grounded
(Pin 11) or open.
In case the oscillator clock is connected, it operates as a
timer clock.
+ R11
R12
V2
V7 – V2
VPWM
VPWM
1.8
V
V
The recommended current range is 20 to 200 mA.
1.2
0
0
t
t
R11
2
R12
3
C2
R1
7
C3
PWM Comparator
+
– 2V
1V
Oscillator
VRef int.
3V
94 9383
Vosc
2.0
V
Vosc
2.0
1.8
V
1.2
1.0
10
0
0
t
t
I10
100
mA
I10
100
mA
0
0
t
t
I12
0
mA
–100
I12
0
t
mA
–100
t
94 9384
Figure 10. Pulse sequence for PWM circuit of figure 9
100
80
Figure 9. PWM comparator input voltage circuit for different
cell capacities
In case the internal clock signal is generated via mains
synchronisation at Pin 1, then Pin 14 should be connected
to Pin 7. The oscillator circuit frequency at Pin 3 can be
selected now deviating from 200 Hz.
Figure 10 shows pulse diagram of PWM with respect to
discharge and charge output currents, whereas figure 11
represents its ratio respecting voltage at Pin 2.
60
40
20
0
1
1.2
1.4
1.6
1.8 2.0
95 9812
V2 ( V )
Figure 11. Duty cycle of PWM circuit of figure 9
TELEFUNKEN Semiconductors
Rev. A2, 21-Nov-96
7 (15)
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