STEVAL-ILL008V1 STMicroelectronics, STEVAL-ILL008V1 Datasheet - Page 9

• 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

R3 and R4 set the maximum voltage to 30 volts. R8 will adjust the constant current output from
220 mA to 400 mA.
I
Table 4. Part List
The output voltage can be changed by readjusting the resistor divider R3 and R4 to allow a
higher output voltage to drive as many as 15 LEDs of typical forward voltage drop.
3.4 Results:
With a minimum input voltage of 20 V, up to 5 LEDs can be driven and with 33 V to 55 V input,
9 LEDs can be driven limited by the output voltage set at 30 volts.
tem
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
Qty
1
1
1
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
C9,C10
R9,R2
Ref
RS
C1
C2
C4
C5
C6
C7
C8
D1
D3
R1
R3
R4
R5
R6
R7
R8
U1
U2
U3
L1
LD2979_sot23-5
STPS160U
1N5242A
LM393D
470uH
220nF
L4971
22nF
100u
0.1u
0.1u
9.1k
8.2k
1nF
39u
51k
15k
13k
560
500
Part Tolerance
1u
1k
1
AN1941 APPLICATION NOTE
1/2W
63V
50V
50V
25V
50V
50V
35V
P10339-ND
sm ceramic
sm ceramic
sm PCC1893CT
sm ceramic PCC1893CT
sm ceramic
P10294
sm ceramic
ST
12V zener
Coilcraft DO3316P-474
sm 2510
36G52-ND
ST
ST
ST
Description
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