U2403B ATMEL Corporation, U2403B Datasheet

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U2403B

Manufacturer Part Number
U2403B
Description
Manufacturer
ATMEL Corporation
Datasheet
Rev. A3, 08-Nov-99
Charge Timer
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
Features
D
D
D
D
D
D
D
D
Block Diagram
Easy-to-run autonomous dual rate charger
Constant charge current
3 h – 24 h charge time programmable
Low-cost DC regulator
Overtemperature protection
Charge-mode indication
Operation starts at the moment of battery insertion
Fast charge-time test mode
AC/DC
Power
supply
inserted
Battery
Charge
LED
Figure 1. Block diagram with external circuit
V
2
1
1
Shunt
R
Charge mode
LED
5
indicator
140 C
í
max
2
í
8
LED
Ready
1
(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 (V
operation continues (see flow chart in figure 4).
Applications
D
D
D
R
1
Cordless telephones
Low-cost battery-charge timer
Entertainment
V
Power supply
S
Sense
= 3.5 to 12 V
V
V
Timer and control logic
+
Ref
R
S
3
= 1.5 V/ 0.1 V/ 0 V
6
3
C
V
1
GND
Ref
R
4
7
oscillator
mode
Test
RC
4
Osc
C
1
4
U2403B
> V
5
S
S
), charge time
TM
1 (12)

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U2403B Summary of contents

Page 1

... Charge Timer 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 ...

Page 2

... Ordering Information Extended Type Number U2403B-x U2403B-xFP U2403B-xFPG3 Pin Description U2403B Sense 3 6 Osc 4 5 Figure 2. Pinning Pin 1, Collector Voltage V 1 Pin open collector output. When V charge cycle is switched off until it is above the supply voltage, as shown in figure 6. Pin 2, Shunt Emitter The constant current source is supplied by the internal operational amplifier ...

Page 3

... U2403B (supply current Frequency C (pF) f (Hz) 4 osc 270 6213 330 470 330 4660 470 680 470 ...

Page 4

... U2403B (12) start Battery inserted Turn on V > LED “ON” 2 Timer start Test V GND Open S mode Divider yes T > max no yes V < 3 Interrupt charging LED Interrupt Continuous charging LED Continuous timing End of timing yes LED “OFF” 2 LED “ON” 1 Trickle charge mode ...

Page 5

... Pin 3 Pin 4 Pin 5 Pin 8 Voltages Pins and 8 Pin 2 Pin 4 Junction temperature Ambient temperature Storage temperature range Thermal Resistance Parameters Junction ambient DIP8 SO8 on PC-board SO8 on ceramic SO8 on ceramic with thermal compound Rev. A3, 08-Nov-99 U2403B Symbol Value 100 s I 300 1 – I 310 ...

Page 6

... U2403B Electrical Characteristics = reference point Pin 7 (GND), unless otherwise specified amb Parameters Test Conditions / Pins Supply voltage limitation Supply current Voltage monitoring Turn-on threshold Turn-off threshold Charge-mode indicator (LED) LED current LED saturation voltage Leakage current Collector terminal, figure 6 Open collector current ...

Page 7

... The advantage of the system is that if sags of short duration appear on the mains voltage or if the trans- formers used are too small, the charge duration is increased, but the charge capacity remains the same, see figure Counting timer –V 1 Counting timer Figure 6. Charge duration – U2403B (12) ...

Page 8

... (12) Basic Equations Nominal Charge Current Trickle Current Typical values are 100 mV 6 supply 8 9 390 2.2 nF Figure 7. Standard application – 20 mA) ch where V = 1.48 V (typ 4 READY LED Charge U2403B LED Rev. A3, 08-Nov-99 ...

Page 9

... As the 5 W temperature cannot be monitored in this case a heat sink 6 with a resonable size should be used for safe operation. Test mode switch S tion check. U2403B – – 0. BYW52 READY LED U2403B Charge R C LED LED can be used for accelerated produc (12) ...

Page 10

... = 100 F nF 330 f(temp.) depends on number of cells 11 Figure 9. U2403B for higher supply voltage with integrated temperature monitoring No of Cells (12) can be reached, the transistor, T Smax switched on and there is current flow into Pin 5, normal charge is terminated green R TLHG5400 2 LED2 ...

Page 11

... DIN specifications 4 5.2 4.8 5.00 4.85 3.7 1.4 0.25 3.8 0.10 6.15 3.81 5.85 5 technical drawings according to DIN specifications 4 U2403B 0.2 11 (12) ...

Page 12

... U2403B Ozone Depleting Substances Policy Statement It is the policy of TEMIC Semiconductor 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 ...

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