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TEMIC Semiconductors
TEMIC Semiconductors


U2405B

Fast Charge Controller for Drained NiCd/NiMH Batteries



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U2405B pdf
U2405B
Fast Charge Controller for Drained NiCd/NiMH Batteries
Description
The fast-charge battery controller circuit, U2405B, uses
bipolar technology. The IC enables the designer to create
an efficient and economic charge system. The U2405B
incorporates intelligent multiple-gradient battery-
voltage monitoring and mains phase control for power
management. With automatic top-off charging, the
Features
D Preformation algorithm for drained batteries
D Multiple gradient monitoring
D Temperature window (Tmin/Tmax)
D Exact battery voltage measurement without charge
D Phase control for charge-current regulation
D Top-off and trickle charge function
D Two LED outputs for charge status indication
D Disabling of d2V/dt2 switch-off criteria
during battery formation
D Battery-voltage check
18 (20) 17 (19) 16 (18)
14 (15)
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 two LED driver indications for charge
and temperature status.
Applications
D Portable power tools
D Laptop/notebook personal computer
D Cellular/cordless phones
D Emergency lighting systems
D Hobby equipment
D Camcorder
Package: DIP18, SO20
13 (14)
12 (13) 11 (12)
4 (4)
1 (1)
Sync
ö
C
ö
R
Phase control
Vöi
Trigger output
Power - on control
VRef
6.5 V/10 mA
Oscillator
Control unit
Gradient
d2V/dt2 and –dV
15 (17)
2 (2)
Power supply
VS = 8 to 26 V
160 mV
Ref
Temp. control
Tmax Sensor
94 8585
5 (5) 6 (6)
7 (8) 8 (9)
Figure 1. Block diagram
Status control
Scan path
Battery
detection
VRef = 5 V
VBatt Monitor
0.1 to 4 V
3 (3)
10 (11)
Charge break
output
9 (10)
( ) SO 20, Pins 7 and 16 NC
TELEFUNKEN Semiconductors
Rev. A2, 14-Nov-96
1 (17)



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U2405B pdf
U2405B
Pin Description
Package: DIP18
Output 1
GND 2
LED2 3
Vöi 4
OPO 5
OPI 6
Tmax 7
Sensor 8
tp 9
93 7723 e
Package: SO20
Output 1
GND 2
LED2 3
Vöi 4
OPO 5
OPI 6
NC 7
Tmax 8
Sensor 9
tp 10
94 8594
2 (17)
18 Vsync
17
ö
C
16
ö
R
15 VS
14 VRef
13 Osc
12 STM.
11 LED1
10 VBatt
20 Vsync
19
ö
C
18
ö
R
17 VS
16 NC
15 VRef
14 Osc
13 STM.
12 LED1
11 VBatt
Pin Symbol
Function
1 Output Trigger output
2 GND Ground
3 LED2 Display output “Green”
4 Vöi Phase angle control input voltage
5 OPO Operational amplifier output
6 OPI Operational amplifier input
7 Tmax Maximum temperature
8 Sensor Temperature sensor
9 tp Charge break output
10 VBatt Battery voltage
11 LED1 LED display output “Red”
12 STM. Test mode switch (status control)
13 Osc Oscillator
14 VRef Reference output voltage
15 VS Supply voltage
16
ö
R
Ramp current adjustment –
resistance
17
ö
C
Ramp voltage – capacitance
18 Vsync. Mains synchronization input
Pin Symbol
Function
1 Output Trigger output
2 GND Ground
3 LED2 Display output “Green”
4 Vöi Phase angle control input voltage
5 OPO Operational amplifier output
6 OPI Operational amplifier input
7 NC Not connected
8 Tmax Maximum temperature
9 Sensor Temperature sensor
10 tp Charge break output
11 VBatt Battery voltage
12 LED1 LED display output “Red”
13 STM. Test mode switch (status control)
14 Osc Oscillator
15 VRef Reference output voltage
16 NC Not connected
17 VS Supply voltage
18
ö
R
Ramp current adjustment –
resistance
19
ö
C
Ramp voltage – capacitance
20 Vsync. Mains synchronization input
TELEFUNKEN Semiconductors
Rev. A2, 14-Nov-96



Part Number U2405B
Description Fast Charge Controller for Drained NiCd/NiMH Batteries
Maker TEMIC Semiconductors - TEMIC Semiconductors
Total Page 17 Pages
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