TB62747AFG/AFNG
TOSHIBA Bi-CMOS Integrated Circuit Silicon Monolithic
TB62747AFG, TB62747AFNG
16-Output Constant Current LED Driver
The TB62747 series is comprised of constant-current drivers
designed for LEDs and LED panel displays.
The regulated current sources are designed to provide a
constant current, which is adjustable through one external
resistor.
The TB62747 series incorporates 16 channels of shift
registers, latches, AND gates and constant-current outputs.
Fabricated using the Bi-CMOS process, the TB62747 series
satisfies the system requirement of high-speed data
transmission.
It operates with a 3.3 or 5.0 V power supply.
TB62747AFG
SSOP24-P-300-1.00B
TB62747AFNG
SSOP24-P-300-0.65A
Features
•
•
16-output built-in
Weight
SSOP24-P-300-1.00B: 0.29 g (typ.)
SSOP24-P-300-0.65A: 0.14 g (typ.)
Output current setting range
: 1.5 to 35 mA @ V
DD
=
3.3 V, V
O
= 0.4 to 1.0 V
Current accuracy (@ R
EXT
= 1.2 kΩ, V
O
= 0.4 V, V
DD
= 3.3 V, 5.0 V)
: Between outputs:
±
1.5 % (max)
: Between devices:
±
1.5 % (max)
high-speed output switching : t
wOE(L)
= 100 ns (min)
: serial-in, parallel-out
Input signal voltage level : 3.3 V and 5.0 V CMOS interfaces
(Schmitt trigger input)
Serial data transfer rate
Power supply voltages
: f
SCK
= 25 MHz (max) @cascade connection
: V
DD
=
3.0 V to 5.5 V
: 1.5 to 45 mA @ V
DD
=
5.0 V, V
O
= 0.4 to 1.2 V
•
•
•
•
•
•
•
•
•
•
Control data format
Operation temperature range: T
opr
=
-40 to 85 °C
Output voltage
: V
O
= 26 V (max)
Power on reset (POR)
Package
: AFG type
: AFNG type
: SSOP24-P-300-1.00B
: SSOP24-P-300-0.65A
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TB62747AFG/AFNG
Pin Assignment (top view)
TB62747AFG/AFNG
GND
SIN
SCK
SLAT
OUT0
V
DD
R
EXT
SOUT
OE
OUT15
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
Note1: Short circuiting an output pin to a power supply pin (V
DD
or V
LED*
), or short-circuiting the R
EXT
pin
to the GND pin will likely exceed the rating, which in turn may result in smoldering and/or permanent
damage. Please keep this in mind when determining the wiring layout for the power supply and GND
pins.
*: V
LED
: LED power supply
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TB62747AFG/AFNG
Block Diagram
OUT0
OUT1
OUT15
V
DD
OUT0
OUT1
Constant current outputs
OUT15
reference
voltage
POR
GND
R
EXT
OE
SLAT
G
Q0 Q1
Q15
16-bit D-latch
D0 D1
D15
R
SIN
SCK
D0
Q0 Q1
Q15
16-bit shift register
Q15
R
SOUT
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TB62747AFG/AFNG
Truth Table
SCK
SLAT
OE
SIN
Dn
Dn
+
1
Dn
+
2
Dn
+
3
Dn
+
3
OUT0
---
OUT7
---
OUT15
(Note1)
SOUT
Dn - 15
Dn - 14
Dn - 13
Dn - 13
Dn - 13
H
L
H
―
(Note2)
―
(Note2)
L
L
L
L
H
Dn --- Dn - 7 --- Dn - 15
No Change
Dn
+
2 --- Dn - 5 --- Dn - 13
Dn
+
2 --- Dn - 5 --- Dn - 13
OFF
Note1: When
OUT0
to
OUT15
output pins are set to "H" the respective output will be ON and when set
to "L" the respective output will be OFF.
Note2: “―“is irrelevant to the truth table.
Timing Diagram
n
=
0
SCK
L
H
SIN
L
H
SLAT
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
H
L
H
OE
L
ON
OUT0
OFF
ON
OUT1
OFF
ON
OUT2
OFF
ON
OUT15
OFF
H
SOUT
L
Note 1:
Note 2:
The latch circuit is a leveled-latch circuit. Please note that it is not a triggered-latch circuit.
Keep the
SLAT
pin is set to “L” to enable the latch circuit to hold data. In addition, when the
SLAT
pin is set to “H” the latch circuit does not hold data. The data will instead pass onto output.
When the
OE
pin is set to “L” the
OUT0
to
OUT15
output pins will go ON and OFF in response to
the data. In addition, when the
OE
pin is set to “H” all the output pins will be forced OFF regardless
of the data.
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TB62747AFG/AFNG
Pin Functions
Pin No
Pin Name
I/O
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
GND
SIN
SCK
SLAT
OUT0
―
I
I
I
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
―
―
The ground pin.
The serial data input pin.
The serial data transfer clock input pin.
Data are shifted at the rising edge.
The latch signal input pin.
Data is saved at L level.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
A sink type constant current output pin.
The constant current output enable signal input pin.
During the “H” level, the output will be forced off.
The serial data output pin.
The constant current value setting resistor connection pin.
Then a resistor connects to the ground.
All output current is set to the same.
The power supply input pin.
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
OE
SOUT
R
EXT
V
DD
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