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U2403B Schematic ( PDF Datasheet ) - TEMIC Semiconductors

Teilenummer U2403B
Beschreibung Charge Timer
Hersteller TEMIC Semiconductors
Logo TEMIC Semiconductors Logo 




Gesamt 12 Seiten
U2403B Datasheet, Funktion
Charge Timer
U2403B
Description
The U2403B is a monolithic, integrated-bipolar circuit
which can be used in applications for time-controlled,
constant-current charge. Selection of charge current
versus timing is carried out by using the external circuit
at Pins 2, 3 and 4. For high current requirement, an
external transistor is recommended in series with the
battery. To protect the IC against high power loss
(typically > 140°C), the oscillator is shut down when the
reference voltage is switched off (0 V). The latter also
takes place when there is a saturation caused by collector
voltage at Pin 1. When the overtemperature has
disappeared and the collector voltage at Pin 1 has
exceeded the supply voltage (V1 > VS), charge time
operation continues (see flow chart in figure 3).
Features
D Easy-to-run autonomous dual rate charger
D Constant charge current
D 3 h – 24 h charge time programmable
D Low cost dc regulator
D Overtemperature protection
D Charge-mode indication
D Operation starts at the moment of battery insertion
D Fast charge time-test mode
Applications
D Cordless telephones
D Low-cost battery-charge timer
D Entertainment
Package: DIP8, SO8
Block Diagram
Power
supply
AC/DC
Battery
inserted
LED2
Charge
R1
R5
LED
LED1
Ready
8
C1
VS GND
67
94 8629
Charge mode
indicator
Power supply
VS = 3.5 to 12 V
Test
mode
5 STM
í max
140°C
1
V1
í
2
Shunt
Timer and control logic
VRef = 1.5 V/ 0.1 V/ 0 V
VRef
+
RC
oscillator
3
Sense
4
Osc
R3 R4
C4
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A2, 14–Nov–96
1 (12)






U2403B Datasheet, Funktion
U2403B
Electrical Characteristics
VS = 6 V, Tamb = 25_C, reference point Pin 7 (GND), unless otherwise specified.
Parameters
Test Conditions / Pins
Supply voltage limitation
Supply current
Voltage monitoring
IS = 4 mA
IS = 20 mA
VS = 6 V
Pin 6
Pin 6
Turn-on threshold
Turn-off threshold
Charge-mode indicator (LED)
Pin 8
LED current
LED saturation voltage
Leakage current
I8 = 3.7 mA
Collector terminal, Figure 5
Pin 1
Open collector current
Saturation threshold
VS = 6 V
Shunt emitter current
R3 = 5.6 W
Operational sense amplifier, Figure 1
Pin 2
Pin 3
Input current
Input voltage
Oscillator
V3 = 0 V
VRef = 1.5 V
VRef = 100 mV
VRef = 0 V
Pin 4
Leakage current
Threshold voltage
Oscillator frequency
Test mode switch (STM)
Input current
Output voltage
V4 = 0 to 0.85 V
Upper
WR4 = 160 k , C4 = 2.2 nF
WR4 = 680 k , C4 = 4.7 nF
Pin 5
V5 = 6 V
V5 = 0 V
High
Low
Symbol
VS
IS
Min.
12.5
12.6
1.4
VTON
VTOFF
2.8
2.5
I8 3.0
V8
Ilkg – 0.35
ICO
VTON
VTOFF
I2
15
2.55
VS–1V
250
I3 –0.6
V3 1.42
40
– 0.4
Ilkg
VT(u)
fosc
– 0.5
875
2700
305
I5
V0(H)
V0(L)
40
– 75
1.7
0.5
Typ. Max. Unit
13.5 V
13.7
2.2 mA
3.5 V
3.2
6.0 mA
960 mV
1.1 mA
55 mA
3.0 3.35
V
VS VS–0.4V
285 mA
0.08 mA
1.5 1.58
V
70 100 mV
40 mV
0.1 mA
985 mV
3050
345
Hz
120 mA
– 20
2.5 V
1.0
6 (12)
TELEFUNKEN Semiconductors
Rev. A1, 20-Mar-96

6 Page









U2403B pdf, datenblatt
U2403B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
12 (12)
TELEFUNKEN Semiconductors
Rev. A1, 20-Mar-96

12 Page





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