U2403B Datasheet, PDF (3/12 Pages) TEMIC Semiconductors – Charge Timer

U2403B
Pin 8, Charge Mode Indicator
An open-collector output supplies constant current to
LED₁ after the active charge phase has been terminated.
í_max controls the function temperature for the final stage
range. This is when the temperature is above 140°C and
the charge function is therefore switched off.
Trickle Charge
The trickle charge starts after the charge has been termi-
nated. In this case, the internal reference voltage is
reduced from 1.5 V to approximately 0.1 V. This means
the charge current is decreased by the factor:
K = 1.5 V/ 0.1 V = 15.
Trickle current = I_ch / 15 + I₆ (supply current) + I₈
It is possible to reduce the trickle charge with resistor R_6,
as shown in figures 6 and 7.
Charge Characteristics
Charge Time
Test time/ Test-Mode Switch S_TM
Open
V_S
GND
3h
41.2 ms
21 s
4h
54.9 ms
28 s
5h
68.6 ms
35 s
6h
82.4 ms
42 s
7h
96.1 ms
49 s
8h
109.8 ms
56 s
9h
123.6 ms
1 min 3 s
10 h
137.3 ms
1 min 10 s
12 h
164.8 ms
1 min 24 s
16 h
219.7 ms
1 min 56 s
Oscillator Components
R₄ (KW)
C₄ (pF)
510
270
430
330
300
470
620
330
430
470
300
680
510
470
390
680
300
1000
620
470
470
680
360
1000
560
680
430
1000
220
2200
620
680
470
1000
200
2200
750
680
510
1000
240
2200
620
820
270
2200
130
4700
390
2200
150
4700
470
2200
200
4700
Frequency
f_osc (Hz)
6213
4660
3728
3105
2663
2330
2071
1864
1553
1165
TELEFUNKEN Semiconductors
Rev. A2, 14–Nov–96
3 (12)