zsp4425 ywyn Corporation, zsp4425 Datasheet - Page 4

• Manufacturer Part Number: zsp4425
• Description: Electroluminescent Lamp Driver For 1.5v Or 2.2v To 4.5v Applications
• Manufacturer: ywyn Corporation

Block Diagram
Zywyn Corporation
Pin Description
Pin Number
Zywyn
1
2
3
4
5
6
7
8
C
Connects to V
or to microcontroller
control output
OSC
= 180pF
BATTERY
>
1
Pin Name
Cap1
FF1
C
COIL
OSC
HON
V
EL2
EL1
V
D1
OSC
DD
SS
V
DD
7
2
V
Figure 1. Block Diagram
FF2
SS
Lamp driver output 2: Connect to EL lamp.
Lamp driver output 1: Connect to EL lamp.
Pin Function
Capacitor input 1: Connect capacitor from V
frequency.
Power supply common: Connect to ground.
Coil input: Connect coil from V
Diode Cathode connection: C
from this pin to ground to minimize coil glitch energy.
Power supply for driver: Connect to system V
or tie with HON pin together connects to system V
Enable for driver operation: high = active; low = inactive.
Q
Q
1MΩ
8
HON
4
Low ESR
decoupling
capacitor
0.1μF
f
f
COIL
LAMP
f
LAMP
Coil
V
3
BATTERY
470μH/4Ω
EL Lamp
INT
DD
HV
to this pin.
(Integrator capacitor), connect capacitor
1
SS
1N4148
EL2
BATTERY
to this pin to set C
5
BATTERY
D1
4
C
for 2.2~4.5V operation,
INT
EL1
6
HV
= 1800pF (typ)
for 1.5V operation.
2
OSC
October 2005
ZSP4425
rev. 04