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NSI45060DDT4G
http://onsemi.com
4
Figure 7. Power Dissipation vs. Ambient
Temperature @ T
J
 = 1505C
T
A
, AMBIENT TEMPERATURE (癈)
80
60
20
0
20
40
600
900
1500
1800
40
700 mm
2
/2 oz
700 mm
2
/1 oz
500 mm
2
/1 oz
1200
2100
300
300 mm
2
/1 oz
500 mm
2
/2 oz
2400
2700
3000
300 mm
2
/2 oz
120
100
3300
3600
3900
4200
APPLICATIONS
Q1
Q2
Anode
Qx
LED
HF3R5570
LED
HF3R5570
LED
HF3R5570
Cathode
Q1
Q2
Anode
LED
HF3R5570
Qx
LED
HF3R5570
LED
HF3R5570
LED
HF3R5570
LED
HF3R5570
LED
HF3R5570
LED
HF3R5570
Cathode
LED
HF3R5570
LED
HF3R5570
Figure 8. Typical Application Circuit
(30 mA each LED String)
Figure 9. Typical Application Circuit
(90 mA each LED String)
Number of LEDs that can be connected is determined by:
D1 is a reverse battery protection diode
LEDs = ((V
in
  Q
X
 V
F
  D1 V
F
)/LED V
F
)
Example: V
in
 = 12 Vdc, Q
X
 V
F
 = 3.5 Vdc, D1VF = 0.7 V
LED V
F
 = 2.2 Vdc @ 30 mA
(12 Vdc  4.2 Vdc)/2.2 Vdc = 3 LEDs in series.
Number of LEDs that can be connected is determined by:
D1 is a reverse battery protection diode
Example: V
in
 = 12 Vdc, Q
X
 V
F
 = 3.5 Vdc, D1VF = 0.7 V
LED V
F
 = 2.6 Vdc @ 90 mA
(12 Vdc  (3.5 + 0.7 Vdc))/2.6 Vdc = 3 LEDs in series.
Number of Drivers = LED current/30 mA
90 mA/30 mA = 3 Drivers (Q1, Q2, Q3)
+

+

D1
D1
V
in
V
in
R
adj
R
adj
R
adj
R
adj
R
adj
R
adj
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