MAX6978(2005_03) Ver la hoja de datos (PDF) - Maxim Integrated
Número de pieza
componentes Descripción
Fabricante
MAX6978
(Rev.:2005_03)
(Rev.:2005_03)
Maxim Integrated
MAX6978 Datasheet PDF : 13 Pages
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8-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection and Watchdog
(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS
ON, RSET = 360Ω)
15
TA = +125°C
TA = +85°C
12
9
6
TA = -40°C
TA = +25°C
3
Typical Operating Characteristics (continued)
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (RSET = 720Ω, V+ = 3.3V)
30
25
TA = -40°C
20
TA = +25°C
15
TA = +85°C
TA = +125°C
10
5
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (RSET = 360Ω, V+ = 3.3V)
60
50
TA = -40°C
40
TA = +25°C
30
TA = +85°C
TA = +125°C
20
10
0
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
0
0 0.5 1.0 1.5 2.0 2.5 3.0
PORT OUTPUT VOLTAGE (V)
0
0 0.5 1.0 1.5 2.0 2.5 3.0
PORT OUTPUT VOLTAGE (V)
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (RSET = 720Ω, V+ = 5.0V)
30
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (RSET = 360Ω, V+ = 5.0V)
60
PORT OUTPUT CURRENT vs. SUPPLY
VOLTAGE (RSET = 720Ω, VOUT = 2V)
26.0
25
TA = -40°C
20
TA = +25°C
TA = +85°C
15
TA = +125°C
10
5
50
TA = -40°C
40
TA = +25°C
30
TA = +85°C
TA = +125°C
20
10
25.5
TA = +85°C
TA = +125°C
25.0
TA = +25°C
24.5
TA = -40°C
0
0 0.5 1.0 1.5 2.0 2.5 3.0
PORT OUTPUT VOLTAGE (V)
0
0 0.5 1.0 1.5 2.0 2.5 3.0
PORT OUTPUT VOLTAGE (V)
24.0
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
PORT OUTPUT CURRENT vs. SUPPLY
VOLTAGE (RSET = 360Ω, VOUT = 2V)
52
PORT OUTPUT CURRENT
vs. RSET RESISTANCE (V+ = 5.0V)
50
40
51
TA = +85°C
TA = +125°C
30
50
20
TA = +25°C
49
TA = -40°C
10
48
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
0
0 2000 4000 6000 8000 10,000
RSET RESISTANCE (Ω)
_______________________________________________________________________________________ 5
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