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Preliminary T6505A
16 Channel LED Driver
FEATURES
GENERAL DESCRIPTION
• 16 constant-current output channels
• Constant output current range:
3~45 mA at VDD=3.3V
3~60 mA at VDD=5V
• Output current accuracy:
between channels: <±3% (max.), and
between ICs: <±6% (max.)
• Staggered output delay
• Maximum data clock frequency: 25MHz
• Output current adjusted through an external
resistor
• Schmitt trigger input
• Fast response of output current, OE (min.):
200 ns
• 3.0V-5V supply voltage
T6505A is designed for LED displays. As an
enhancement of its predecessor, T6505A
contains a serial buffer and data latches which
convert serial input data into parallel output
format. At T6505A output stage, sixteen
regulated current ports are designed to provide
uniform and constant current sinks for driving
LEDs within a large range of Vf variations.
T6505A provides users with great flexibility
and device performance while using T6505A
in their system design for LED display
applications, e.g. LED panels. Users may
adjust the output current from 3 mA to 60 mA
through an external resistor Rext, which gives
users flexibility in controlling the light
intensity of LEDs. T6505A guarantees to
endure maximum 5V at the output port. The
high clock frequency, 25 MHz, also satisfies
the system requirements of high volume data
transmission. The T6505A is available in
SOP-24 and SSOP-24 lead-free package.
Applications
• LED Display Driver
• Portable Communication Devices
• Handheld Electronics
• Lightings
PART NUMBER EXAMPLES
PACKAGE
Pin Out
T6505A-ADG
SOP-24
Type A
T6505A-AEG
SSOP-24
Type A
T6505A-BDG
SOP-24
Type B
T6505A-BEG
SSOP-24
Type B
PART NO.
TM Technology Inc. reserves the right
P. 1
to change products or specifications without notice.
Publication Date: JUN. 2007
Revision: 0.A
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Preliminary T6505A
PIN ARRANGEMENT(Top view)
GND
1
24
VDD
OUT14
1
24
OUT13
OUT15
2
23
OUT12
OE
3
22
OUT11
SDI
2
23
R-EXT
CLK
3
22
SDO
LE
4
21
OE
SDO
4
21
OUT10
OUT0
5
20
OUT15
R-EXT
5
20
OUT9
OUT1
6
19
OUT14
VDD
6
19
OUT2
7
18
OUT13
GND
7
18
OUT8
OUT7
OUT3
8
17
OUT12
SDI
8
17
OUT6
OUT4
9
16
OUT11
CLK
9
16
OUT5
OUT5
10
15
OUT10
LE
10
15
OUT4
OUT6
11
14
OUT0
11
14
OUT3
OUT7
12
13
OUT1
12
13
OUT2
OUT9
OUT8
Type A
T6505A-ADG
T6505A-AEG
Type B
T6505A-BDG
T6505A-BEG
PIN DESCRIPTION
SYMBOL
Pin no.
GND
SDI
CLK
LE
OUT0 ~ OUT15
1
2
3
4
5 ~ 20
OE
21
SDO
22
R-EXT
23
VDD
24
DESCRIPTION
Ground
Serial-data input to the shift register
rising edge and carries command information when LE is asserted
Data strobe terminal and controlling
Constant current output terminals
Output enable terminal, When OE (active) low, the output drivers are enabled;
when OE high, all output, drivers are turned OFF (blanked)
Serial-data output to the receiver-end SDI of next driver IC
Input terminal used to connect an external R-EXT resistor for setting up output
current for all output channels
Power supply
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P. 2
to change products or specifications without notice.
Publication Date: JUN. 2007
Revision: 0.A
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Preliminary T6505A
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Value
Unit
Voltage on any pin relative to GND
VIN
-0.3 to 7
V
Operating Temperature Rang
TA
-40 to +85
°C
Sustaining Voltage at Outpout Ports
VDS
8
V
TLEAD
300
°C
TS
-55 to +150
°C
SOP
SSOP
2.12
Maximum Soldering Temperature (at leads, 10 sec)
Storage Temperature Rang
Continuous Power Dissipation ( TA = +25°C )
W
1.73
DC Electrical Characteristics
(TA = -40 to 85°C unless otherwise noted. Typical values are at TA =25°C)
Symbol
Description
VDD Operating voltage range
VDS
Sustaining Voltage at Outpout
Ports
IOUT
Outpout Current
VIH
VIL
VOH
VOL
Input high voltage
Input low voltage
Output high voltage
Output low voltage
Output leakage current in
shutdown
Data Clock Frequency
Over temperature output current
Thermal Protect
Output Current 1
IIL
FDCLK
IOTC
TTP
IOUT1
dIOUT1 Current Skew
IOUT2
Output Current 1
dIOUT2 Current Skew
RIN(UP)
RIN(DN)
IDDoff1
IDDoff2
IDDoff3
IDDon1
IDDon2
IDDoff1
IDDoff2
IDDoff3
IDDon1
IDDon2
Pull-up resistor
Pull-down resistor
Supply
Current
(VDD=5V)
Supply
Current
(VDD=3.3V)
OFF
ON
Conditions
/OUT0 ~ /OUT15
VDD=3.3V
VDD=5V
Min.
3
Typ.
-
Max
5
Unit
V
-
-
8
V
3
3
45
60
VDD
GND
4.6
-
-
-
.04
V
V
V
V
-
0.5
uA
160
15
25
-
MHz
mA
°C
mA
-
-
±3
%
-
30
-
mA
-
-
±3
%
250
250
-
500
500
2.0
2.0
2.5
2.5
3.0
1.5
2.0
2.0
2.0
3.0
800
800
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
KΩ
KΩ
0.7*VDD
IOH= -1.0mA
IOL=1.0mA
VDS=5V
VDS=1V, REXT=1240 Ω
VDS=1V, REXT=1240 Ω,
IOL=15mA
VDS=1V, REXT=620 Ω
VDS=1V, REXT=620 Ω,
IOL=30mA
/OE
LE
REXT=Open, /OUT0~15=Off
REXT=1240Ω, /OUT0~15=Off
REXT=620Ω, /OUT0~15=Off
REXT=1240Ω, /OUT0~15=On
REXT=620Ω, /OUT0~15=On
REXT=Open, /OUT0~15=Off
REXT=1240Ω, /OUT0~15=Off
REXT=620Ω, /OUT0~15=Off
REXT=1240Ω, /OUT0~15=On
REXT=620Ω, /OUT0~15=On
TM Technology Inc. reserves the right
P. 3
to change products or specifications without notice.
mA
-
IOUT*0.5
0.3*VDD
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
Publication Date: JUN. 2007
Revision: 0.A
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Preliminary T6505A
AC Electrical Characteristics
(TA = -40 to 85°C unless otherwise noted. Typical values are at TA =25°C)
Symbol
tPLH1
tPLH2
tPLH3
tPLH
tPHL1
tPHL2
tPHL3
tPHL
tWCLK
tWL
tWOE
tHL
tSUL
tHD
tSUD
tF
tR
tOF
tOR
Description
Conditions
Min. Typ. Max
CLK to /OUTn
40
60
LE to /OUTn
40
60
Propagation Delay Time
(“L” to “H”)
/OE to /OUTn
20
30
CLK to SDO
15
20
CLK to /OUTn
30
60
LE to /OUTn
30
60
Propagation Delay Time
V
=5.0V
DD
(“H” to “L”)
/OE to /OUTn
20
40
=V
V
IH
DD
CLK to SDO
15
20
VIL =GND
CLK
20
R
EXT=930 ohm
Pulse Width
LE
20
VLED=4.5V
/OE
200
RL=162 ohm
LE Hold Time
5
CL=10 pF
LE Setup Time
5
SDI Hold Time
10
5
SDI Setup Time
500
CLK Fall Time
CLK Rise Time
500
Output Fall Time of Vout (turn on)
25
80
Output Rise Time of Vout (turn off)
50 200
TM Technology Inc. reserves the right
P. 4
to change products or specifications without notice.
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Publication Date: JUN. 2007
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Preliminary T6505A
Timming Waveform
tW
C L K
C L K
tS U
D
tH
D
S D I
S D O
L E
tP
L H ,
tP
tH
tW
L
H L
tS U
L
O E
L O W
L
= O u tp u t E n a b le d
H ig h = O u tp u t O ff
O U T n
tP
tP
L H 1,
tP
L H 2,
H L 2
L o w = O u tp u t O n
H L 1
tW
O E
tP
O E
50%
50%
tPH L3
90%
O U T n
tPLH 3
50%
10%
tO F
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P. 5
to change products or specifications without notice.
50%
90%
10%
tO R
Publication Date: JUN. 2007
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Preliminary T6505A
Timming Waveform
N=0
1
2
3
4
5
6
D14
D13
D12
D11
D10
7
8
9
10
11
12
13
14
15
CLK
D15
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
SDI
LE
OE
D0
Off
OUT0
On
Off
OUT1
D1
OUT2
D2
On
Off
On
Off
OUT3
On
Off
D15
OUT15
SDO
Don't care
On
D15
Truth Table
CLK
LE
/OE
SDI
/OUT0…../OUT7…../OUT15
SDO
H
L
Dn
/Dn……./Dn-7……./Dn-15
Dn-15
L
L
Dn+1
No Change
Dn-14
H
L
Dn+2
/Dn+2……./Dn-5……./Dn-13
Dn-13
X
L
Dn+3
/Dn+2……./Dn-5……./Dn-13
Dn-13
X
H
Dn+3
Off
Dn-13
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Publication Date: JUN. 2007
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Preliminary T6505A
Setting Output Current
The output current (IOUT) is set by an external resistor Rext, The default relationship between
IOUT and Rext is shown in the following figure.
Rs e t
25
Rset (k)
20
15
Rs e t
10
5
0
5. 01
10. 01
20. 01
30
40. 06
50. 02
60. 04
70. 07
I o u t ( mA)
Also, the output current can be calculated from the equation:
VR-EXT = 1.0V ; IOUT = VR-EXT x(1 /Rext) x 90 = (VR-EXT/ Rext)x90
Whereas Rext is the resistance of the external resistor connected to R-EXT terminal and VR-EXT is
its voltage.
Delay Time of Stag gered Output
T6505A has a built-in staggered circuit to perform delay mechanism. Among output ports exist a
graduated 38ns delay time among /OUTodd and /OUTeven, by which the output ports will be
divided to tow groups at a different time so that the instant current from the power line will be
lowered.
Package Power Dissipation (PD)
The maximum allowable package power dissipation is determined as PD(max) = (Tj-Ta) / Rth(j-a).
When 16 output channels are turned on simultaneously, the actual package power dissipation is
PD(act) = (IDD x VDD) + (IOUT x Duty x VDS x 16). Therefore, to keep PD(act). PD(max), the
allowable maximum output current as a function of duty cycle is:
IOUT = { [ (Tj - Ta) / Rth (j-a) ] - (IDD x VDD) } / VDS / Duty / 16, where Tj = 150°C
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P. 7
to change products or specifications without notice.
Publication Date: JUN. 2007
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Preliminary T6505A
LED Supply Voltage (VLED)
T6505A are designed to operate with VDS ranging from 0.4V to 0.8V (depending on
IOUT=3~45mA) considering the package power dissipating limits. VDS may be higher enough to
make PD(act )>PD(max) when VLED = 5V and VDS = VLED - VF, in which VLED is the load
supply voltage. In this case, it is recommended to use the lowest possible supply voltage or to set an
external voltage reducer VDROP. A voltage reducer lets VDS = (VLED - VF) - VDROP.
Resistors or Zener diode can be used in the applications as shown in the following figures.
VCC
VCC
VLED
VLED
VDROP
VDROP
VDS
VF
VDS
VF
T6505A
T6505A
Switching Noise Reduction
LED drivers are frequently used in switch-mode applications which always behave with switching
noise due to the parasitic inductance on PCB. To eliminate switching noise.
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to change products or specifications without notice.
Publication Date: JUN. 2007
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Preliminary T6505A
H
1
12
C
E
24
13
PACKAGE DIMENSIONS
24-LEAD SOP
e1
e
A
D
X
Symbol
A
A1
C
D
E
e
e1
H
L
X
Min.
0.095
12.8
5.8
0.3
7.7
0.25
Dimension in mm
Typ.
0.1
1.2
13.0
6.0
1.0
0.4
8.0
0.45
0~8°
Max.
1.90
0.105
13.2
6.2
0.5
8.3
0.65
L
A1
0 .0 0 4 m a x
Min.
0.003
0.503
0.228
0.011
0.299
0.009
Dimension in inch
Typ.
0.003
0.047
0.511
0.236
0.039
0.015
0.314
0.017
0~8°
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P. 9
to change products or specifications without notice.
Max.
0.075
0.004
0.519
0.244
0.019
0.326
0.025
Publication Date: JUN. 2007
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Preliminary T6505A
H
1
12
C
E
24
13
PACKAGE DIMENSIONS
24-LEAD SSOP
e1
e
A
D
X
Symbol
A
A1
C
D
E
e
e1
H
L
X
Min.
0.05
8.58
3.81
0.204
5.8
0.80
Dimension in mm
Typ.
0.13
0.8
8.66
3.91
0.635
0.254
6.0
0.83
0~8°
Max.
1.63
0.21
8.74
4.11
0.304
6.2
0.86
L
A1
0 .0 0 4 m a x
Min.
0.002
0.337
0.150
0.008
0.228
0.031
Dimension in inch
Typ.
0.005
0.031
0.341
0.154
0.025
0.010
0.236
0.032
0~8°
TM Technology Inc. reserves the right
P. 10
to change products or specifications without notice.
Max.
0.064
0.008
0.344
0.162
0.012
0.244
0.033
Publication Date: JUN. 2007
Revision: 0.A