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U2407B Datasheet

Simple Controller for Fast Charge Systems

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Simple Controller for Fast Charge Systems
U2407B
Description
The bipolar IC U2407B is a fast charge battery controller
for drained NiCd/ NiMH batteries. Apart from phase
control, it is identical with U2405B, but has four LED
outputs. The IC enables the designer to create an efficient
and economic charge system. The U2407B incorporates
an intelligent multiple-gradient battery-voltage moni-
toring combined with temperature and failure mode
detection. With automatic top-off charging, the
integrated circuit ensures that the charge device stops
regular charging before the critical stage of overcharging
is achieved. It incorporates an additional algorithm for
reactivating fully drained batteries especially after long
time storage. It has four LED driver outputs for different
indications of the charge status.
Features
D Multiple gradient monitoring
D Temperature window (Tmin/Tmax)
D Exact currentless measurement
D Four LED status outputs
D Linear power control
D Preferred for externally regulated current sources
D Preformation algorithm for drained batteries
D Programmable top-off charge function
Applications
D Primary switch mode
D AC/ DC wall plug adapter
D Ultra fast charger (10 minutes)
Package: DIP16/ SO16
13
VRef
6.5 V/10 mA
16 Switch output
Power - on control
14
Power supply
1 VS = 8 to 26 V
95 10648
4
12
Oscillator
Control unit
Gradient
d2V/dt2 and –dV
160 mV
Ref
Temp. control
Tmax Sensor
56
Figure 1. Block diagram
7
15 2 3 10
Status control
Scan path
Battery
detection
VRef = 5 V
VBatt monitor
0.1 to 4 V
Charge break
output
8
11
9
TELEFUNKEN Semiconductors
Rev. A4, 05-Mar-97
1 (16)
TEMIC Semiconductors
TEMIC Semiconductors



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