STEVAL-ILL008V1 STMicroelectronics, STEVAL-ILL008V1 Datasheet - Page 5

• Manufacturer Part Number: STEVAL-ILL008V1
• Description: EVAL BOARD CREE LED FLASHLIGHT
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ILL008V1

• Mfg Application Notes: Low Voltage LED Driver AppNote
• Design Resources: STEVAL-ILL008V1 Gerber Files STEVAL-ILL008V1 Schematic STEVAL-ILL008V1 Bill of Materials
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.5V
• Features: 1V Start up Input Voltage
• Voltage - Input: 1 ~ 5.5 V
• Utilized Ic / Part: L6920
• Product: Display Modules
• Core Chip: L6920DA
• Output Voltage: 3.5V
• Kit Contents: L6920D, L4971, L6902D Reference Board
• Development Tool Type: Hardware - Eval/Demo Board
• Tool / Board Applications: LED Flashlight
• Mcu Supported Families: L6920DA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output / Channel: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-5516

Figure 7. Vin = 0.6V; upper trace: inductor current; lower trace: LED current
Fig. 8 shows the efficiency of the driver at different load and input voltages.
Figure 8. Efficiency curve
Table 1. Bill of Material:
C2,C1
C3
C4
C5
L1
R1
R2
R3
R4
U1
U2
0.9
0.8
0.7
0.6
0.5
1
1.9
Ref
2.1
Input Voltage (V)
2.3
Efficiency
47uF 6.3V Electro sm
.47uF 0805
.1uF 0805
.01uF 0805
10uH sm inductor
.33 Ohm 1% 1/4W 0805
100K 5% 0805
12K 5% 0805
1K 5% 0805
L6920D Tssop8
TS951ILT sot23
2.5
2.7
I
LED
Value
I
3
L
500mA/div
100mA/div
AN1941 APPLICATION NOTE
275mA Output
30mA Output
5/15