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FAN5702UMP08X 数据表(PDF) 11 Page - Fairchild Semiconductor

部件名 FAN5702UMP08X
功能描述  Configurable 180mA 6-LED Driver with I2C Control
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FAN5702UMP08X 数据表(HTML) 11 Page - Fairchild Semiconductor

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© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5702 • Rev. 1.0.3
11
Circuit Description
The FAN5702 is a white LED driver system based on an
adaptive 1.5x charge pump capable of supplying up to 180mA
of total output current. The tightly matched current sinks
ensure uniform brightness between the LEDs. Each LED has
a common anode configuration with its peak drive current set
during manufacturing (see Ordering Information and ISET). An
I
2C-compatible interface is used to vary the brightness within
the individual current sinks as well as configure the grouping.
Each LED is controlled with 64 exponentially spaced analog
brightness control levels through I
2C, as indicated in Table 1.
For maximum flexibility, the FAN5702 can be programmed
with five independently controlled LED banks; by default,
arranged as 2,1,1,1,1 (first two LEDs represent Group A).
Through I
2C, the device can be reconfigured to add up to six
LEDs to Group A as needed by application requirements.
Charge Pump
The charge pump operates in either 1x mode, where VOUT is
connected to VIN through a bypass switch, or in 1.5x mode.
The circuit operates in 1x mode until the LED with the highest
forward voltage (VLED(MAX)) can no longer maintain current
regulation. At that point, 1.5x mode begins. If the lowest active
cathode voltage is greater than 1.8V, the charge pump
switches back to 1x mode.
IC Enable
By default the General Purpose register bit 7 = 0, the EN pin
functions as enable/disable. When the EN pin is LOW, all
circuit functions, including I
2C, are disabled and the registers
are set to their default values.
When the EN pin HIGH, I
2C interface is enabled. The LEDs
can be turned on/off by writing to the General Purpose
register. The user can always communicate via I
2C with the
device to change register settings regardless of whether any
LED is on or off.
PWM Dimming
By programming the General Purpose register bit 7 = 1, the
EN pin is reappropriated to a PWM dimming input. Applying a
PWM signal to this pin controls the LED current waveform to
be ON when the PWM dimming pin is HIGH and OFF when
the PWM dimming pin is LOW. By using this pin in conjunction
with the I
2C register dimming, the part can achieve higher
dimming resolution. For instance, an 8-bit PWM dimming
signal applied along with the 6-bit register dimming yields
better than 14 bits of resolution
To change the PWM dimming pin back to the EN function, set
the General Purpose register bit 7 to 0.
Register Controlled Brightness
The DC value of the LED current is modulated according to
the values in Table 1. Current is expressed as a percentage of
the full scale current and is illustrated with a 20mA ISET.
Table 1. Brightness Control
Dimming Code (Bx5-Bx0)
Current Level
ILED (mA) (ISET=20mA)
000000
0.125%
0.025
000001
0.188%
0.038
000010
0.249%
0.050
000011
0.312%
0.063
000100
0.374%
0.075
000101
0.438%
0.088
000110
0.499%
0.100
000111
0.560%
0.113
001000
0.622%
0.125
001001
0.692%
0.138
001010
0.750%
0.150
001011
0.810%
0.163
001100
0.875%
0.175
001101
0.938%
0.188
001110
1.004%
0.200
001111
1.124%
0.225
010000
1.250%
0.250
010001
1.375%
0.275
010010
1.499%
0.300
010011
1.625%
0.325
010100
1.750%
0.350
010101
1.881%
0.375
010110
2.063%
0.413
010111
2.249%
0.450
011000
2.438%
0.488
011001
2.687%
0.538
011010
2.939%
0.588
011011
3.186%
0.638
011100
3.562%
0.713
011101
3.936%
0.788
011110
4.310%
0.863
011111
4.813%
0.963
100000
5.314%
1.063
100001
5.936%
1.188
100010
6.565%
1.313
100011
7.313%
1.463
100100
8.059%
1.613
100101
8.938%
1.788
100110
9.876%
1.975
100111
10.874%
2.175
101000
12.005%
2.400
101001
13.253%
2.650
101010
14.618%
2.925
101011
16.124%
3.225
101100
17.881%
3.575
101101
19.875%
3.975
101110
22.121%
4.425
101111
24.621%
4.925
110000
27.376%
5.475
110001
30.373%
6.075
110010
33.623%
6.725
110011
37.124%
7.425
110100
40.873%
8.175
110101
44.875%
8.975
110110
49.124%
9.825
110111
53.624%
10.725
111000
58.375%
11.675
111001
63.378%
12.675
111010
68.625%
13.725
111011
74.122%
14.825
111100
79.874%
15.975
111101
85.873%
17.175
111110
92.373%
18.475
111111
100.000%
20.000


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