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NSI45020JZT1G Datasheet, PDF (4/6 Pages) ON Semiconductor – Adjustable Constant Current Regulator & LED Driver | |||
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NSI45020JZT1G
2300
2100
1900
500 mm2/2 oz
300 mm2/2 oz
1700
1500
100 mm2/2 oz
1300
1100 500 mm2/1 oz
900
700
500
â40
300 mm2/1 oz
100 mm2/1 oz
â20
0
20
40
60
80
TA, AMBIENT TEMPERATURE (°C)
Figure 7. Power Dissipation vs. Ambient
Temperature @ TJ = 1505C
APPLICATIONS
D1
Anode
Q1
Q2
Cathode
+
â Vin
Radj
LED
HF3âR5570
Radj
LED
HF3âR5570
LED
HF3âR5570
LED
HF3âR5570
LED
HF3âR5570
LED
HF3âR5570
Qx
Radj
LED
HF3âR5570
LED
HF3âR5570
LED
HF3âR5570
D1
Anode
Q1
Q2
Cathode
+
â Vin
Radj
LED
HF3âR5570
LED
HF3âR5570
LED
HF3âR5570
Radj
Qx
Radj
Figure 8. Typical Application Circuit
(30 mA each LED String)
Number of LEDâs that can be connected is determined by:
D1 is a reverse battery protection diode
LEDâs = ((Vin â QX VF â D1 VF)/LED VF)
Example: Vin = 12 Vdc, QX VF = 3.5 Vdc, D1VF = 0.7 V
LED VF = 2.2 Vdc @ 30 mA
(12 Vdc â 4.2 Vdc)/2.2 Vdc = 3 LEDs in series.
Figure 9. Typical Application Circuit
(90 mA each LED String)
Number of LEDâs that can be connected is determined by:
D1 is a reverse battery protection diode
Example: Vin = 12 Vdc, QX VF = 3.5 Vdc, D1VF = 0.7 V
LED VF = 2.6 Vdc @ 90 mA
(12 Vdc â (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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