SC604AIMLTR Semtech, SC604AIMLTR Datasheet - Page 9

• Manufacturer Part Number: SC604AIMLTR
• Description: IC,Laser Diode/LED Driver,LLCC,16PIN,PLASTIC
• Manufacturer: Semtech

Specifications of SC604AIMLTR

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

There are four methods for setting and adjusting the LED current
outlined here. The methods are:
Method 1. The most basic means of setting the LED current is
with a resistor connected from ISET to GND, as shown in the
application circuit on Page 1. The resistor R
reference current needed for a constant LED current. Values of
R
below graph, “Typical R
2 and 3 on page 10 are for setting the LED current allow for
brightness control.
POWER MANAGEMENT
Methods for Setting LED Current
SET
2005 Semtech Corp.
for a fixed LED current are given in Table 2 and also in the
1000
1) R
2) Analog Reference V
3) NMOS switched parallel resistors
4) PWM Input
950
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
0.5
SET
only
1
SET
1.5
Resistance vs. LED Current”. Methods
2
ADJ
2.5
3
SET
Typical R
establishes the
3.5
4
SET
Resistance vs. LED Current
4.5
LED Current [mA]
9
Table 2 - Resistor Value Selection
5
I
I
I
I
I
E L
E L
E L
E L
E L
5.5
0
[ D
[ D
[ D
[ D
[ D
1
2
3
1
3
5
1
2
5 .
0
5
0
0
m
m
m
m
m
] A
] A
] A
] A
] A
6
6.5
R R R R R
3
S T E
S T E
S T E
S T E
S
9
4
2
1
1
9
4
2
T E
1
4
7
4
6
7
5
3
3
k [k [k [k [k [ ] ] ] ] ]
8 .
7
5 .
0 .
0 .
5 .
1
1
7
5
3
R R R R R
S T E
S T E
S T E
S T E
S
7.5
T E
a V e
a V e
a V e
a V e
a V
u l
u l
u l
u l
u l
N
N
N
N
N
t S
t S
t S
t S
t S
8
a e
a e
a e
a e
a e
e
a V e
a V e
a V e
a V e
a V
n a
n a
n a
n a
n a
9
3
2
1
4
9
4
1
e r
e r
e r
e r
e r
2
1
4
6
3
7
7
3
5
u l
u l
u l
u l
u l
3
d
d
d
d
d
5 .
t s
t s
t s
t s
t s
6 .
0 .
5 .
0
1 .
8.5
1
7
4
a
a
a
a
a
e
d r
d r
d r
k
k
k
d r
d r
k
k
www.semtech.com
SC604A
9
%
%
%
%
%
t S
t S
t S
t S
t S
D
D
D
D
D
9.5
a V e
a V e
a V e
a V e
a V
0 -
0 -
1 -
0 -
n a
n a
n a
n a
n a
f f i
f f i
f f i
f f i
f f i
0
0
0
0
0
0 .
0 .
0 .
0 .
0 .
2 .
6 .
0 .
7 .
u l
u l
u l
u l
u l
r e
r e
r e
r e
r e
d
d
d
d
d
%
%
%
%
%
%
%
%
%
a
a
a
a
a
e
n e
n e
n e
n e
n e
10
d r
d r
d r
d r
d r
e c
e c
e c
e c
e c