LED7708 STMicroelectronics, LED7708 Datasheet - Page 5

• Manufacturer Part Number: LED7708
• Description: LED Lighting Drivers 16 Ch 85mA LED 3.6 to 36V 250kHz
• Manufacturer: STMicroelectronics

Specifications of LED7708

• Rohs: yes

LED7708
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Basic application circuit schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection (through top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Simplified block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Soft-start waveforms (standalone operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Simplified output regulation circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Effect of slope compensation on small inductor current perturbation (D>0.5) . . . . . . . . . . 26
Simplified serial interface block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Timing diagram related to a DEVCFGx write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
16-bit data format, write operation to the brightness register . . . . . . . . . . . . . . . . . . . . . . . 31
256-bit data format, write operation to the brightness registers . . . . . . . . . . . . . . . . . . . . . 32
192-bit data format, write operation to the brightness registers . . . . . . . . . . . . . . . . . . . . . 32
Dimming signals and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Normal timing mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Inverted timing mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Dimming waveform and GSSY output pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Dimming waveform triggered by GSSY input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Internal signals connected to the XFLT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Channels current gain adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Continuous reading mode disabled, 1x256-bit data format . . . . . . . . . . . . . . . . . . . . . . . . 46
Continuous reading mode enabled, 1x256-bit data format . . . . . . . . . . . . . . . . . . . . . . . . . 47
VFQFPN48 (7 x 7 x 1.0 mm.) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Recommended PCB footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Doc ID 022698 Rev 1
List of figures
5/53