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TYPICAL APPLICATIONS
INTRODUCTION
TYPICAL APPLICATIONS
INTRODUCTION
The MC34674 can be used as a regular linear charger with
the charge current set internally. However, the best way of
using this device in the travel charger application is to use this
IC together with a current-limited AC/DC regulator. Select a
version with the internally set current higher than the target
charge current and then power the charger with an AC/DC
regulator whose output current is limited to a value lower.
This section introduces how to use the MC34674 with a
current-limited AC/DC regulator. Also discussed in this
section is the application information.
CURRENT-LIMITED AC/DC REGULATOR
A current-limited AC/DC regulator has an output current
The trickle-charge mode can be illustrated both on the I/V
characteristics plot in Figure 25 and the time domain charge
curve in Figure 26 . In the I/V characteristics trajectory, the
battery voltage moves from point a to point b , representing
that the current remains at the trickle mode charge current,
I TRKL while the battery voltage moves from a value below the
trickle-charge threshold, V TRKL , to the trickle-charge
threshold. The AC/DC regulator output stays at point A during
the trickle mode with no changes for its output current and
voltage.
V
and voltage characteristics shown in Figure 24 . The regulator
outputs a no load voltage, V NL , when the supply is not loaded.
As the load current increases, the output voltage remains
relatively constant. When the load current reaches the
current limit of the regulator, I LIM , the regulator output
behaves as a constant current source. Usually a current-
V NL
4.2V
e
E
A
ac/dc regulator
output
D
d C
limited regulator output is specified in a range, as the range
limited by the dotted lines.
OPERATION WITH CURRENT-LIMITED AC/DC
REGULATOR
The operation of the MC34674 when powered by a
V TRKL
b
a
MC34674
output
c
B
current-limited regulator is dependent on the battery voltage.
Figure 25 and Figure 26 assist the explanation of the
I EOC I TRKL
I LIM
I
operation.
When the battery voltage is lower than the trickle-charge
threshold, the MC34674 is in the trickle mode. The trickle
mode current is typically lower than the current limit, I LIM , and
hence the AC/DC regulator output is a constant-voltage. The
MC34674 operates same as a regular linear charger.
V
Figure 25. AC/DC Regulator Output and MC34674
Output I/V Characteristics.
V IN
V BAT
V NL
I BAT
Time
I LIM
I TRKL
Time
a
b
d
e
c
I LIM
I
A
A
C
E
B
D
Figure 24. AC/DC Regulator Output I/V Characteristics.
Figure 26. Charging Waveforms When Powered with
Current-Limited Regulators.
34674
Analog Integrated Circuit Device Data
20
Freescale Semiconductor
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