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U2403B

TEMIC Semiconductors
Part Number U2403B
Manufacturer TEMIC Semiconductors
Description Charge Timer
Published Apr 16, 2005
Detailed Description U2403B Charge Timer Description The U2403B is a monolithic, integrated-bipolar circuit which can be used in applications...
Datasheet PDF File U2403B PDF File

U2403B
U2403B

Overview
U2403B 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 (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 D D D D D D D 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 Applications D Cordless telephones D Low-cost battery-charge timer D Entertainment Package: DIP8, SO8 Block Diagram R1 Power supply AC/DC LED2 Battery inserted Charge R5 LED 8 Charge mode indicator LED1 Ready VS 6 Power supply VS = 3.
5 to 12 V GND 7 Test mode 5 STM 94 8629 C1 í max 140°C 1 V1 Timer and control logic VRef = 1.
5 V/ 0.
1 V/ 0 V VRef í 2 Shunt + – 3 Sense R3 R4 RC oscillator 4 Osc C4 Figure 1.
Block diagram with external circuit TELEFUNKEN Semiconductors Rev.
A2, 14–Nov–96 1 (12) U2403B Pin Description V1 V2 Sense 1 8 LED Pin 1 2 3 4 5 6 7 8 Symbol V1 V2 V3 Osc STM VS GND LED Function Collector terminal Shunt emitter terminal Amplifier sense input Oscillator input Test mode switch Supply voltage Reference point, GND Charge mode indicator 2 7 GND VS STM 3 6 Osc 4 94 8685 5 Pin 1, Collector Voltage V1 Pin 1 is an open collector output.
When V1 ≤ 3 V, the charge cycle is switched off until it ...


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