U243B Datasheet, PDF (3/6 Pages) TEMIC Semiconductors – Warning or Car-Direction Indicator

U243B
Electrical Characteristics
Typical values under normal operation in application circuit figure 1, V_S (+49, Pins 2 and 6) = 12 V
Reference point ground (–31), T_amb = 25°C, unless otherwise specified
Parameters
Test Conditions / Pin Symbol Min
Typ
Max
Unit
Supply voltage range
Supply current,
Pins 2 and 6 V_S (+49)
9 ... 15
V
Pins 2 and 6
dark phase or stand-by
Supply current,
I_S
Pins 2 and 6
4.5
8
mA
bright phase
Z–diode limitation
I_S
7.0
11
mA
I_{S2, 6} = 70 mA
Pins 2 and 6
V_S
23
V
Relay output,
saturation voltage
I₀ = 150 mA, V_S = 9 V
Relay output,
Pin 3
V_O
Pin 3
1.0
V
reverse current
Relay coil resistance
I_O
R_L
60
0.1
mA
W
Start delay
(first bright phase)
Frequency-determining
resistor
t_on
R_t
6.8
10
ms
510
kW
Frequency-determining
capacitor
C_t
Frequency tolerance (normal flashing, basic frequency
47
mF
f₁ not including the tolerance of the external compo-
nents R₁ and C_t)
Bright period
(basic frequency f₁)
Bright period
(control frequency f₂)
Frequency increase
∆f₁
–5
∆f₁
47
∆f₂
37
+5
%
53
%
45
%
(lamp failure)
f₂
2.15 f₁
2.3f₁
Control-signal threshold
V_S = 15 V
V_S = 9 V
V_S = 12 V
Pin 7
V_R3
85
91
97
mV
Pin 7
V_R3
66
71
76
mV
Pin 7
V_R3
76
81
87
mV
Transfer resistance
49a to common for
stand-by
R_P
2
5
kW
Lamp load
P_L
10
W
Applications
D Flashing generator, operation with smaller loads
(≥ 2 W)
By adding a resistor to the application circuit (figure 1),
defined operation with lamp loads ≥ 2 W is possible. The
voltage drop across the resistor R₄ is generated by the
current flowing over the relay and should be about 15 mV.
W ^{With a relay current of 150 mA (relay resistance 73 Q),}
this requires a resistance of R₄ = 100 m . The change of
the operating point by 15 mV results in a corresponding
change of the control signal threshold by 15 mV. For a
lamp current of 2.7 A, a measuring resistance of
W ^{81 mV – 15 mV}
R₃ =
2.7 A
= 25 m
results.
TELEFUNKEN Semiconductors
3 (6)
Rev. A1, 05-Sep-96
Preliminary Information