NTE1503
Integrated Circuit
5Step LED Driver Circuit
for Logarithmic Response
Description:
The NTE1503 is an integrated circuit in a 9Lead SIP type package designed for driving 5LED bar
graphs or dot displays so that the LEDs may light logarithmically (dB) for input signal. Brightness of
the LEDs can be controlled by using the output current adjustment pin provided.
Features:
D
5LED Bar Graph or Dot Display Drive
D
Logarithmic Response with Respect to Input
D
Brightness Externally Adjustable
D
High Output Current, Suitable for Green LED Drive
D
Lamp ON/OFF Hysteresis, No Flickering by Noise
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Supply Voltage, V
CC
0.5V to +18V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Voltage, V
85
0.5V to +16V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load Current Set Input Voltage, V
75
+16V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage (Note 1), V
O
0.5V to +16V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Current, I
CC
18mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load Current Set Input Current, I
7
4.25mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Current, I
O
20mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
D
550mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Ambient Temperature Range, T
opr
20
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperatuere Range, T
stg
55
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. Output Pin1, Pin2, Pin3, Pin4, and Pin6.
Electrical Characteristics: (T
A
= +25
C, V
CC
= 16V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Voltage (LED ON)
LED 1
V
I(ON)1
1.12
V
LED 2
V
I(ON)2
1.86
V
LED 3
V
I(ON)3
3.10
V
LED 4
V
I(ON)4
5.18
V
LED 5
V
I(ON)5
8.66
V
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