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LP5813 bảng dữ liệu(PDF) 21 Page - Texas Instruments

tên linh kiện LP5813
Giải thích chi tiết về linh kiện  LP5813 Synchronous Boost 4 × 3 Matrix RGB LED Driver With Autonomous Control
PDF  60 Pages
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Trang chủ  http://www.ti.com
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LP5813 bảng dữ liệu(HTML) 21 Page - Texas Instruments

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OUT0
OUT1
OUT2
OUT3
VOUT
Vmid
VOUT - Vf
VOUT
Vmid
VOUT - Vf
Vmid
VOUT - Vf
Vmid
VOUT - Vf
PWM off
Voltage clamp to Vmid
Blank time
period
Switching
period
Figure 9-12. Ghosting elimination waveform when clamp_sel = 1
OUT0
OUT1
OUT2
OUT3
VOUT
Vmid
VOUT - Vf
VOUT
Vmid
VOUT - Vf
Vmid
VOUT - Vf
Vmid
VOUT - Vf
PWM off
Outputs floating
Blank time
period
Switching
period
Voltage clamp to Vmid
Figure 9-13. Ghosting elimination waveform when clamp_sel = 0
9.3.3 Analog Dimming
The current gain of each LED can be controlled by 2 methods to achieve analog dimming in the LP5813.
• Global 1-bit Maximum Current (MC) control for all LEDs without external resistor
• Individual 8-bit Dot Current (DC) control for each LED
The maximum output current IOUT_max of each current sink can be programmed by the 1-bit max_current. The
default value of max_current is 0h, which means the LED maximum current is set to 25.5 mA in default.
Table 9-2. Maximum Current (MC) bit setting
1 bit Maximum Current (MC)
IOUT_MAX (mA)
Binary
Decimal
0 (default)
0 (default)
25.5 (default)
1
1
51
The LP5813 can individually adjust the peak current of each LED by using Dot Current (DC) function. The
brightness deviation among the LED bins can be miminized, to achieve uniform display performance. The
current is adjusted with 256 steps from 0 to 100% of IOUT_MAX., which is programmed in an 8-bit register whose
default value is 80h.
Table 9-3. Dot Current (DC) bits setting
8-bits Dot Current (DC) Register
Ratio of IOUT_MAX
Binary
Decimal
0000 0000
0
0%
0000 0001
1
0.39%
0000 0010
2
0.78%
www.ti.com
LP5813
SNVSC74 – SEPTEMBER 2023
Copyright © 2023 Texas Instruments Incorporated
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Product Folder Links: LP5813



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