Texas Instruments TPS65820 Evaluation Module TPS65820EVM TPS65820EVM データシート
製品コード
TPS65820EVM
FUNCTIONALITY GUIDE — LED AND PERIPHERAL DRIVERS
L3
SM3
PGND3
4.7 H
m
PWM
LED_PWM
RED
BLUE
GREEN
P3
AGND0
A0
PWM
DRIVER
RGB
DRIVER
WHITE LED
DRIVER
DISPLAY AND I/O
SM3_SW
OUT
TPS65820
WHITE LEDS
LSM3
EXTERNAL
PERIPHERALS
RGB LED
D1
R
10
FB3
W
C27
1 F
1 F
m
C18
100 pF
100 pF
FB3
www.ti.com
..............................................................................................................................................................
SLVS663B – MAY 2006 – REVISED APRIL 2008
WHITE LED CONSTANT CURRENT DRIVER
Driver
PWM
Output
LED Current
Eff (%)
Power Up
Voltage
Default
Duty Cycle
# of Steps
Io(Typ)
Max
Acc (%)
Range
SM3
Off (0%),
256
5 V–25 V
Set by external resistor
25 mA
25
80
Off (0%)
0.4% -99.6%
Set via I
2
C
OPEN DRAIN PWM DRIVERS
Driver
PWM Freq (kHz)
PWM Duty Cycle
Io(max)
Power Up Default
mA
Range
# of Steps
Min Step
PWM
0.5/1/1.5/2/3/ 4.5/7.8/15.6
Off (0%),
8
6.25%
150
Off(0%)
Set via I
2
C
6.25% to 100
Set via I
2
C
LED_PWM
15.625 or 23.4 , set via I
2
C
Off(0%),
256
0.4%
150
Off (0%)
0.4% to 99.6%
Set via I
2
C
RGB OPEN DRAIN LED DRIVER
Driver
Flash Period (same for RGB)
Flash On time (same for RGB)
Brightness
Io mA
Power Up
(Individual R/G/B Control)
Default
Range
# of
Min Step
Range
# of
Min Step
Duty (%)
# of
Min
Steps
Steps
Steps
Steps
RED,
No flash,
16
0.5 s
0.1–0.6 s
8
0.1 s
Off (0%),
32
3.125%
0/4/8/12
Flash Off, 0
GREEN,
or 1–8 s
Set via I
2
C
3.125 to
mA,
BLUE
Set via I
2
C
96.87
0%
Set via I
2
C
brightness
duty cycle
Figure 53. Required External Components, Recommended Values, External Connections
Copyright © 2006–2008, Texas Instruments Incorporated
75
Product Folder Link(s):