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MM5451BV Datasheet(PDF) 6 Page - Micrel Semiconductor

Part # MM5451BV
Description  LED Display Driver
PDF  8 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MM5451BV Datasheet(HTML) 6 Page - Micrel Semiconductor

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MM5450/5451
Micrel
MM5450/5451
6
May 2000
Typical Performance Characteristics
Typical Applications
Figure 10. Typical Application of Constant Current
Brightness Control
CD4046
(VCO)
5V
MM74HC123
10 µS
MM5450
Q19
20
1
Figure 11. Brightness Control Varying the Duty Cycle
Figure 7.
Figure 8.
2.5
2.0
1.5
1.0
0.5
0
04
8
12
16
20
24
28
I
(mA)
LED
T = 85°C
T = 150°C (MAX)
A
J
20
SEG
M
1.0
0.8
0.6
0.4
0.2
0
020
40
60
80
TEMPERATURE (°C)
34 SEGMENTS
V
= 1V
15 mA/SEGMENT
OUT
SAFE OPERATING
AREA
100
Figure 9.
110
100
90
80
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
34
NUMBER OF SEGMENTS
V
= 1V
OUT
V
= 1.5V
OUT
V
= 2V
OUT
T = 85°C
A
LM324
MM5450
LM317
–
+
∆V
240
Ω
RAW DC
> 9 V
∆V
1K
I19 =
2N2907
I19
PIN 19
5V
20
1
5k
7V
1k



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