NSI45060DDT4G Datasheet, PDF (4/6 Pages) ON Semiconductor – Adjustable Constant Current Regulator & LED Driver

NSI45060DDT4G
4200
3900
700 mm²/2 oz
3600
3300
500 mm²/2 oz
3000
2700
2400
300 mm²/2 oz
2100
1800 _{700 mm}2_{/1 oz}
1500
1200
900
500 mm²/1 oz
600
300
−40 −20 0
300 mm²/1 oz
20 40 60 80
100 120
T_A, AMBIENT TEMPERATURE (°C)
Figure 7. Power Dissipation vs. Ambient
Temperature @ T_J = 1505C
APPLICATIONS
D1
Anode
Q1
Q2
Cathode
+
− ^Vin
R_adj
LED
HF3−R5570
R_adj
LED
HF3−R5570
LED
HF3−R5570
LED
HF3−R5570
LED
HF3−R5570
LED
HF3−R5570
Qx
R_adj
LED
HF3−R5570
LED
HF3−R5570
LED
HF3−R5570
D1
Anode
Q1
Q2
Cathode
+
− ^Vin
R_adj
LED
HF3−R5570
LED
HF3−R5570
LED
HF3−R5570
R_adj
Qx
R_adj
Figure 8. Typical Application Circuit
(30 mA each LED String)
Number of LED’s that can be connected is determined by:
D1 is a reverse battery protection diode
LED’s = ((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.
Figure 9. Typical Application Circuit
(90 mA each LED String)
Number of LED’s 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)
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