T6506A

tm
TE
CH
T6506A
3-ch Constant-Current LED Drivers
FEATURES
GENERAL DESCRIPTION
• Up to 45mA LED Bias Current
• 6% LED Current Matching
• Simple LED Brightness Control
• 5V to 8V Supply Voltage Range
• Serial in Data Clock Frequency : 25MHz
• PWM Output Current Control
• Build in Thermal Protect 160 °C
• SOP-16 Package and Lead-free
The T6506A is a 3-channel constant current
LED drivers. The T6506A uses external
resistors to set the output current for LEDs,
which are matched to 6%. much lower bias
variation with supply voltage variation,
significantly lower dropout voltage, and in
some applications, significantly improved
efficiency.
The T6506A built in oscillator for PWM
functioning, data and clock buffer output for
cascading and data to next driver.
Applications
• LED/Display Back Light Driver
• Lightings
• LED Decorative Lighting
PART NUMBER EXAMPLES
T6506A-ADG
Control
mode
Mode1
SOP-16 lead-free
T6506A-BDG
Mode2
SOP-16 lead-free
PART NO.
TM Technology Inc. reserves the right
P. 1
to change products or specifications without notice.
PACKAGE
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
PIN ARRANGEMENT
(Top view)SOP-16
D IN
1
16
GMODE
2
OMODE
15
VDD
DOUT
D IN
LE
1
2
3
14
VOUT
3
D CLK
4
OE
OUT1
FB1
5
6
13
12
/O E
D C LK
OUT1
VSS
OUT2
7
10
FB 3
FB2
8
9
VSS
11
D CLK O
OUT3
mode1
OUT2
VSS
16
15
14
VDD
DOUT
LEO U T
/O E O U T
5
6
7
13
12
11
10
8
9
4
D CLKO
OUT3
VSS
VSS
mode2
PIN DESCRIPTION
DESCRIPTION
Pin no.
SYMBOL
Mode1
Mode2
DIN
1
1
GMODE
2
LE
OMODE
2
3
/OE
DCLK
OUT1
FB1
OUT2
FB2
VSS
FB3
OUT3
DCLKO
EN
/OEOUT
4
5
6
7
8
9
10
11
12
13
VOUT
14
LEOUT
DOUT
VDD
3
4
5
7
6,8,9,10
11
12
13
15
16
14
15
16
Serial data input, internal pull high
gray level adjustment, “1”=Linear modulation, “0”= 256 level none Linear modulation,
internal pull high
Leach data, hight active
Output control mode, “1”= internal output constant voltage/current mode,
“0”= external resistors set current mode, internal pull high
Output enable, low active
Serial clock input, internal pull high
Output port 1
Output port 1 constant voltage/current mode, or external set resistors terminal
Output port 2
Output port 2 constant voltage/current mode, or external set resistors terminal
ground
Output port 3 constant voltage/current mode, or external set resistors terminal
Output port 3
Serial clock output
Chip enable, hight active
Output enable signle output, low active
5V output, if VDD>5V, output=5V. if VDD<5V, output=VDD.
Also is internal operation voltage, Suggestion connected a 0.1uF capacitor to ground.
Leach data signle output
Serial data output
Power supply
TM Technology Inc. reserves the right
P. 2
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Value
Unit
Voltage on any pin relative to GND
VIN
-0.3 to 8
V
Operating Temperature Rang
TA
-40 to +85
°C
TLEAD
300
°C
TS
-65 to +150
°C
0.6
W
Maximum Soldering Temperature (at leads, 10 sec)
Storage Temperature Rang
Continuous Power Dissipation ( TA = +70°C )
Electrical Characteristics
(TA = -40 to 85°C unless otherwise noted. Typical values are at TA =25°C, VEN =3.3V, VOUT1 = VOUT2= VOUT3= 1V)
Symbol
Description
VDD
Operating voltage range
VOUT
VOUT output voltage
Conditions
VOUTX LED output ports voltage
Min. Typ. Max
Unit
5
-
7.5
V
4.75
5
5.25
V
-
-
12
V
VIH
Input voltage high level
2.0
-
-
V
VIL
Input voltage low level
-
-
0.6
V
ILED
Maximum LED sink current
constant voltage
-
-
45
mA
constant current
-
-
30
mA
IDD
Operating voltage current
-
1.5
-
mA
IOSH
Serial data output high current
-
-
1.5
mA
IOSL
Serial data output low current
-
-
-10
mA
FCLK Input data clock frequency
tCKHW Clock high pulse width
0
30
-
25
-
MHz
ns
tCKLW Clock low pulse width
30
-
-
ns
10
-
-
ns
tDS
Input data setup time
tHS
Input data hold time
CL=30pF, RL=1K
5
-
-
ns
Serial data output ON/OFF time
IOUT=20mA
-
-
80
ns
PWM output ON pulse width
IOUT=20mA
-
-
200
ns
tDONF
tPO
TM Technology Inc. reserves the right
P. 3
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
Control mode 1 Timming Waveform
(3 series connection IC)
1
16
1
16
1
16
1
16
1
2
3
DCLK1
DIN1
start_bit
chip1_data
1
16
chip2_data
1
16
chip3_data
1
16
1
16
1
2
DCLKO1
DOUT1
start_bit
1
0
16
chip2_data
1
16
chip3_data
1
16
1
16
1
2
DCLKO2
DOUT2
start_bit
1
0
16
0
1
16
chip3_data
1
16
1
16
1
2
DCLKO3
DOUT3
start_bit
0
0
0
OUTPUT_X
EN
notes :
1.DCLK and DCLKO is inverse.
2.start_bits is 16 bits Length "0"
3.Data Format:
The total data is 16 bits :
bit 0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
F1
Channel 1 data
Channel 2 data
Channel 3 data
If after receives the 16bits length "0" start_bit, if has receives 1 bit again”0”, pass through to output.
if has receives 1 bit again "1", then regards as "F1", The “F1” bit0 is “1”, leach follow the 15bits
data, after “F1” and 15bits data all change to “0”, then pass through 16 bits “0” data to output.
The channel data 00000~11111, May use Gmode pin control the 5bits value transformation to the
8bits inverse-gama value (256 steps), or the 7bits linear value(128 steps), again has the output
afterwards by PWM.
TM Technology Inc. reserves the right
P. 4
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
Control mode 1 Typical Application Circuits
Internal constant current mode:
V+
RL
VDD
DIN
DCLK
VDD OUT1 OUT2 OUT3
DIN
DOUT
T6506A
DCLK
DCLKO
VOUT GND FB1 FB2 FB3
RL
VDD
VDD OUT1 OUT2 OUT3
DIN
DOUT
T6506A
DCLK
DCLKO
VOUT GND FB1 FB2 FB3
R SET
DOUT
DCLKO
R SET
This mode (OMODE= hight or floating) IOUT≈0.7V/RSET, The output voltage must be able to
maintain constant current the condition between 1.1~6V.
For condition example :
VLED+6V+ILED*RL ≥ V+ ≥ VLED+1.1V+ILED*RL
Maximum power consumed:
PD=ILED1*(VOUT1-0.7V)+ ILED2*(VOUT2-0.7V)+ ILED3*(VOUT3-0.7V)+ PIC
Internal constant voltage mode :
V+
RL
VDD
DIN
DCLK
VDD OUT1 OUT2 OUT3
DIN
DOUT
T6506A
DCLK
DCLKO
VOUT GND FB1 FB2 FB3
RL
VDD
VDD OUT1 OUT2 OUT3
DIN
DOUT
T6506A
DCLK
DCLKO
VOUT GND FB1 FB2 FB3
DOUT
DCLKO
this mode (OMODE= hight or floating) RL=(V+ - VLED - VOUTX)/ILED
Maximum power consumed:
PD=ILED1*VOUT1+ ILED2*VOUT2+ ILED3*VOUT3+ PIC
TM Technology Inc. reserves the right
P. 5
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
External constant voltage mode
V + 12 V ~ 24 V
RL
O M O D E = "L"
VDD
D IN
D C LK
VDD
D IN
D C LK
VOUT
RB
T 65 06A
OUTX
G N D FB 1 FB 2 F B 3
This mode is suitable for many LED or a higher voltage situation, is in fact the NPN transistor by
the OUTX output voltage control more LED.
RL Resistance calculational avenue :
RL=(V+ - VLED - VCE)/ 20mA
Generally VCE = 0.5V~0.8V, RB = 2K~5K
External constant current mode
V + 12V ~24V
O M O D E = "H "
VDD
D IN
D C LK
VDD
D IN
RB
VOUT
T6506A
D CLK
OUTX
RX
GND
FBX
This mode is suitable to single series connects many LED , also V+ is over than 12V the situation,
besides constant current and the augment driving with transistor
ILED current calculational avenue :
ILED = IO * β / (β +1)
The β is multiple which transistor enlargement, when β is bigger, the previous close to ILED = IO
with RB=5K.
TM Technology Inc. reserves the right
P. 6
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
Control mode 2 Timming Waveform
D C LK
2
1
0
2
1
0
D IN
D C LK O
DOUT
/O E
LE
/O E O U T
LEO U T
OUT1
OUT2
OUT3
Control mode 2 Typical Application Circuits
V+
RL
VDD
VDD OUT1 OUT2 OUT3
DIN,
LE,
/OE,
DCLK
T6506A
GND
RL
VDD
VDD OUT1 OUT2 OUT3
T6506A
Data Input
and Output
GND
DOUT,
LEOUT,
/OEOUT,
DCLKO
RL=(V+ - VLED - VOUTX)/ILED
TM Technology Inc. reserves the right
P. 7
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
PWM Duty Comparative table
Non-linear gray level
(Correspondence with GAMMA=1.8, GMODE=0)
Input data
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Output Duty Ratio (unit:1/256)
0
1
3
5
8
12
16
21
26
32
38
45
52
60
68
76
85
95
105
115
125
136
148
160
172
185
198
211
225
239
254
256
Linear gray level
(Correspondence with GMODE=1 )
Input data Output Duty Ratio (unit:1/128)
0
0
1
4
2
8
3
12
4
16
5
20
6
24
7
28
8
32
9
36
10
40
11
44
12
48
13
52
14
56
15
60
16
64
17
68
18
72
19
76
20
80
21
84
22
88
23
92
24
96
25
100
26
104
27
108
28
112
29
116
30
120
31
128
TM Technology Inc. reserves the right
P. 8
to change products or specifications without notice.
Publication Date: JAN. 2008
Revision: A
tm
TE
CH
T6506A
PACKAGE DIMENSIONS
16-LEAD SOP
D
E
H
e
A
a
C
L
b
Symbol
A
a
b
C
D
E
e
L
Min.
0.36
0.19
9.8
3.8
0.4
Dimension in mm
Typ.
Max.
1.75
0.25
0.49
0.25
10
4.0
1.27
1.0
Min.
0.014
0.007
0.386
0.150
0.016
Dimension in inch
Typ.
0.069
0.010
0.050
-
TM Technology Inc. reserves the right
P. 9
to change products or specifications without notice.
Max.
0.019
0.010
0.394
0.157
0.039
Publication Date: JAN. 2008
Revision: A