LM3556_15 Datasheet, PDF (7/39 Pages) Texas Instruments – Synchronous Boost LED Flash Driver With High-Side Current Source

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6.7 Typical Characteristics
1.60
1.55
1.50
1.45
TA = -40°C
TA = +25°C
TA = -+85°C
1.40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN(V)
V_LED = 3.6 V
I_LED = 1.5 A
Figure 2. Flash LED Current vs V_IN
100
96
92
88
84
80
76
VIN =4.2V
VIN =3.9V
72
VIN =3.6V
VIN =3.3V
68
VIN =3.0V
VIN =2.7V
64
60
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
ILED(A)
V_LED = 3.8 V
Figure 4. Flash LED Efficiency vs Flash LED Current
100
95
90
85
80
75
70
65
60
TA=25°C
TA=85°C
55
TA=-40°C
50
2.7 3.1 3.4 3.8 4.1 4.5 4.8 5.2 5.5
VIN (V)
V_LED = 3 V
Figure 6. Torch LED Efficiency vs V_IN
LM3556
SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015
100
TA = -40°C
90
TA = +25°C
TA = +85°C
80
70
60
50
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN(V)
V_LED = 3.6 V
I_LED = 1.5 A
Figure 3. Flash LED Efficiency vs V_IN
0.400
0.393
0.385
0.378
0.370
0.363
0.355
0.348
TA=25°C
TA=85°C
TA=-40°C
0.340
2.7 3.1 3.4 3.8 4.1 4.5 4.8 5.2 5.5
VIN (V)
V_LED = 3 V
I_LED = 375 mA
Figure 5. Torch LED Current vs V_IN
3.0
2.5
2.0
1.5
1.0
0.5
25°C
85°C
- 40°C
0.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
EN = 1.8 V
Figure 7. I_Q Standby vs V_IN
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