STEVAL-ILL023V1 STMicroelectronics, STEVAL-ILL023V1 Datasheet - Page 7

• Manufacturer Part Number: STEVAL-ILL023V1
• Description: BOARD EVAL BASED ON L6726A
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ILL023V1

• Current - Output / Channel: 2.8A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 2.5 ~ 14 V
• Features: Dimmable
• Voltage - Input: 8 ~ 18 V
• Utilized Ic / Part: L6726A
• Description/function: LED Driver Demo Board
• Operating Current: 2.8 A
• Operating Voltage: 8 V to 18 V
• Product: Display Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: LEDs based on the L6726A
• Other names: 497-9046

UM0677
2.1
Current sensing
Adapting the voltage step-down regulator as a constant current source requires few external
components (as indicated in
but that results in high losses on the sense resistors (feedback reference is 0.8 V). When
voltage reference TS821 is used, the losses are almost three times lower.
The application depicted allows setting three different values of the output current. The
options are 1 A, 1.5 A and 2.8 A. The output currents are chosen by the jumper on the
header P1 as indicated in
Figure 3.
Table 2.
Part of schematics with highlighted components for efficient current
sensing
Nominal output current settings
1
Header P1
2
Table
3
Figure
Doc ID 15396 Rev 2
2.
3). Basically only a sense resistor would be necessary,
Description of reference design
Output current
1.5 A
2.8 A
1 A
7/16