D355B Datasheet, PDF (11/14 Pages) List of Unclassifed Manufacturers – Electroluminescent Lamp Driver IC

IX. High EL Brightness Through Supply Voltage Doubling (Option 3)
In the following circuit, the Analog Devices ADM8828 produces a negative Vbat voltage. This voltage may
be connected to the GND pin on the D355 to double the differential voltage supplied to the D355. This can
produce about twice the brightness of the D355 alone.
*NOTE: It is important not to exceed the maximum ratings of either device in this circuit.
1.0µF
1 OUT CAP+ 6
Vbat
2 IN SHDN 5
3 CAP- GND 4
ADM8828
OFF
ON
1 GND
E’ 8
2 L-
CLF2 7
CLF
L
3 VOUT
CLF1 6
Vbat
4 L+ _D355 V+ 5
EL Lamp
1.0µF
X. EL Lamp Brightness Regulation
Regulating the DC supply input voltage to the D355 will result in a constant brightness level from the EL
lamp, regardless of battery voltage. In this example, a Micrel voltage regulator is used.
1 GND ^{OUT 4}
E
2E
IN 3
ON
MIC5203
Vbat
OFF
1 GND
E’ 8
2 L-
CLF2 7
CLF
L
3 VOUT CLF1 6
4 L+
V+ 5
D355
EL Lamp
1.0µF
12