D355B Datasheet, PDF (7/14 Pages) List of Unclassifed Manufacturers – Electroluminescent Lamp Driver IC

D355B Design Ideas
I. Driving Multi-Segment Lamps
The D355B may be used to drive two or more EL lamps or EL lamp areas independently. An external
switching circuit can be used to turn each lamp segment on or off. A high signal at the E input for the
corresponding EL lamp will power the segment when the IC is enabled. In this example, Segment 1 is
always on when the Durel D355B is enabled. Otherwise, always make sure that at least one segment is
switched on when the driver IC is activated.
1 GND
E’ 8
OFF
ON
2 L-
CLF2 7
CLF
L
3 VOUT CLF1 6
4 L+
V+ 5
D355
1.0µF
Vbat
EL Lamp
Segment 1
EL Lamp
Segment 2
EL Lamp
Segment 3
BAS21LT1
ON
E2
OFF 2.2K 4.7K
MMBT5401LT1
BAS21LT1
BAS21LT1
ON
E3
MMBT5551LT1
OFF 2.2K 4.7K
MMBT5401LT1
BAS21LT1
MMBT5551LT1
1K
100 nF
1K
100 nF
II. Enabling the D355B with a High Logic Signal
A low logic signal at the E’ pin will enable the D355B. Adding a transistor and two resistors will allow the
D355B to be enabled with a high voltage signal.
Vbat
1MΩ
1 GND
2 L-
E’ 8
CLF2 7
1MΩ
ON
E
OFF
CLF
L
3 VOUT
CLF1 6
4 L+
D355
V+ 5
1.0µF
Vbat
EL Lamp
8