CAT4008V-T1 [CATALYST]
8-Channel Constant Current LED Driver; 8通道恒流LED驱动器
| 型号： | CAT4008V-T1 |
| 厂家： | 
CATALYST SEMICONDUCTOR |
| 描述： | 8-Channel Constant Current LED Driver |
| 文件： | 总14页 (文件大小：258K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT4008
8-Channel Constant Current LED Driver
FEATURES
DESCRIPTION
8 Constant current-sink channels
Serial interface up to 25MHz clock frequency
3V to 5.5V logic supply
The CAT4008 is an 8 channel constant current driver
for LED billboard and other general display
applications. LED channel currents are programmed
together via an external RSET resistor. Low output
voltage operation on the LED channels as low as 0.4V
(for 2 to 100mA LED current) allows for more power
efficient designs.
LED current range from 2mA to 100mA
LED current set by external RSET resistor
300mV LED dropout at 30mA
Thermal shutdown protection
A high-speed 4-wire serial interface of up to 25MHz
clock frequency controls each individual channel using
a shift register and latch configuration. A serial output
data pin (SOUT) allows multiple devices to be
cascaded and programmed via one serial interface.
The device also includes a blanking control pin
(BLANK) that can be used to disable all channels
independently of the interface.
Available in RoHS-compliant 16-lead SOIC (150
and 300mil wide), and TSSOP packages
APPLICATIONS
Billboard Display
Marquee Display
Instrument Display
General Purpose Display
Thermal shutdown protection is incorporated in the
device to disable the LED outputs if the die
temperature exceeds a set limit.
The device is available in the 16-lead SOIC (narrow
and wide), and TSSOP packages.
For Ordering Information details, see page 13.
TYPICAL APPLICATION CIRCUIT
VIN
3V to
5.5V
20mA
1µF
VDD
LED1 LED2
LED8
BLANK
LATCH
SIN
to next
device
CAT4008
SOUT
RSET
CLK
3.09kΩ
GND
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5034 Rev. A
CAT4008
ORDERING INFORMATION
Part Number
CAT4008W-T2
CAT4008V-T1
CAT4008Y-T2
Package
Quantity per Reel Package Marking
SOIC16 (N) (1)
SOIC16 (W) (1)(2)
TSSOP16 (1)(2)
2000
1000
2000
CAT4008W
CAT4008V
CAT4008Y
PIN CONFIGURATION
16-Lead SOIC (W, V), TSSOP (Y)
1
2
3
4
5
6
16
15
14
13
12
11
VDD
GND
SIN
RSET
SOUT
BLANK
LED8
LED7
SCLK
XLAT
LED1
LED2
7
8
10
9
LED6
LED5
LED3
LED4
Notes:
(1) Matte-Tin Plated Finish (RoHS-compliant).
(2) Contact factory for package availability.
Doc. No. MD-5034 Rev. A
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT4008
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Units
V
VDD Supply Voltage
6
-0.3V to VDD+0.3V
6
Logic input/output voltage (SIN, SOUT, CLK, BLANK, LATCH)
LEDn voltage
V
V
DC output current on LED1 to LED8
Storage Temperature Range
Junction Temperature Range
Lead Soldering Temperature (10sec.)
150
mA
°C
°C
°C
-55 to +160
-40 to +150
300
RECOMMENDED OPERATING CONDITIONS
Parameter
Range
3.0 to 5.5
0.4 to 5.5
up to 100
-40 to +85
Units
V
VDD
Voltage applied to LED1 to LED8
LED current RSET control range
Ambient Temperature Range
V
mA
°C
ELECTRICAL OPERATING CHARACTERISTICS
DC CHARACTERISTICS
VDD = 5.0V, TAMB = 25 ºC, over recommended operating conditions unless specified otherwise.
Symbol Name
Conditions
Min
Typ
Max
Units
VLED = 1V, RSET = 3.08kꢀ
VLED = 1V, RSET = 1.54kꢀ
VLED = 1V, RSET = 769ꢀ
VLED = 1V, RSET = 3.08kꢀ
VLED = 1V, RSET = 1.54kꢀ
18
36
20
40
22
44
ILED-ACC
LED Current (any channel)
mA
80
±1.5
±1.5
±2.0
LED Current Matching
(ILED - ILEDAVR) / ILEDAVR
ILED-MAT
%
-6.0
+6.0
V
LED = 1V, RSET = 769ꢀ
VDD within 4.5V and 5.5V
LED current 30mA
VLED within 1V and 3V
LED current 30mA
LED current regulation vs. VDD
LED current regulation vs. VLED
±0.1
% / V
% / V
ΔIVDD
±0.05
ΔIVLED
RSET = 3.08kꢀ
RSET = 769ꢀ
RSET = 3.08kꢀ
2
8
9
mA
mA
mA
IDDOFF
IDDON
Supply Current (all outputs off)
Supply Current (all outputs on)
5.5
2.5
RSET = 769ꢀ
6.2
mA
µA
kꢀ
kꢀ
ILKG
LEDn output Leakage
VLED = 5V, outputs off
-1
1
RLATCH
RBLANK
LATCH Pull-down Resistance
BLANK Pull-up Resistance
100
100
180
180
300
300
VIH
VIL
Logic high input voltage
Logic low input voltage
0.7xVDD
V
V
0.3xVDD
VHYS
Logic input hysteresis voltage
0.1xVDD
0
V
Logic Input leakage current
(CLK, SIN)
IIL
VI = VDD or GND
-5
5
µA
V
VOH
VOL
SOUT logic high output voltage
SOUT logic low output voltage
I
OH = -1mA
V
CC-0.3V
IOL = 1mA
0.3
VRSET
TSD
RSET Regulated Voltage
Thermal Shutdown
BLANK high, outputs off
1.17
1.20
160
20
1.23
V
ºC
ºC
THYST
Thermal Hysteresis
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-5034 Rev. A
CAT4008
TIMING CHARACTERISTICS
For 3.0V ≤ VDD ≤ 5.5V, TAMB = 25 ºC, unless specified otherwise.
Symbol Name
CLK
Conditions
Min(1)
Typ(2)
Max(1)
Units
fclk
tcwh
tcwl
CLK Clock Frequency
25
MHz
ns
CLK Pulse Width High
CLK Pulse Width Low
20
20
ns
SIN
tssu
tsh
Setup time SIN to CLK
Hold time SIN to CLK
4
4
ns
ns
LATCH
tlwh
LATCH Pulse width
20
4
ns
ns
ns
Tlh
Hold time LATCH to CLK
Setup time LATCH to CLK
Tlsu
Channel Stagger Delay
LATCH to LED1 off/on
400
LEDn
tld
LED1 Propagation delay
40
17
300
40
ns
ns
tls
LED Propagation delay stagger LED(n) to LED(n+1)
LED Propagation delay stagger
tlst
LED1 to LED8
total
120
ns
tbd
tlr
BLANK Propagation delay
LED rise time (10% to 90%)
LED fall time (90% to 10%)
BLANK to LED(n) off/on
60
40
30
300
200
250
ns
ns
ns
Pull-up resistor = 50ꢀ to 3.0V
Pull-up resistor = 50ꢀ to 3.0V
tlf
SOUT
tor
SOUT rise time (10% to 90%)
SOUT fall time (90% to 10%)
Propagation delay time SOUT
CL = 15pF
5
5
ns
ns
ns
tof
CL = 15pF
tod
CLK to SOUT
8
15
25
TEST CIRCUIT FOR AC CHARACTERISTICS
1µF
VDD
VDD
Rp
Rp
50ꢀ
50ꢀ
LED1
BLANK
LATCH
SIN
CAT4008
LED8
V1
3V
CLK
SOUT
Cl
15pF
RSET
GND
RSET
Notes:
(1) All min and max values are guaranteed by design.
(2) DD = 5V, LED current 30mA.
V
Doc. No. MD-5034 Rev. A
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT4008
1/fclk
CLK
SIN
tssu
tsh
tcwl
tcwh
tod
SOUT
LATCH
tlh
tlsu
tlwh
Figure 1. Serial Input Timing Diagram
tld
LATCH
tbd
BLANK
LED1
LED2
LED8
tls
tlst = 7 tls
Figure 2. LED Output Timing Diagram
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-5034 Rev. A
CAT4008
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 5.0V, LED current 30mA, all LEDs On, TAMB = 25°C unless otherwise specified.
LED Current vs. LED Pin Voltage
Supply Current vs. VDD Pin Voltage
70
4.0
3.5
3.0
2.5
2.0
1.5
1.0
All LED's ON
60
50
40
30
20
10
0
All LED's OFF
0.0
0.3
0.6
0.9
1.2
1.5
3.0
3.5
4.0
4.5
5.0
5.5
LED PIN [V]
VDD [V]
LED Current vs. VDD Pin Voltage
Supply Current vs. RSET Current
8
7
6
5
4
3
2
1
0
31.5
All LED's ON
31.0
30.5
30.0
29.5
29.0
28.5
All LED's OFF
3.0
3.5
4.0
VDD [V]
4.5
5.0
5.5
0.0
0.5
1.0
1.5
2.0
RSET CURRENT [mA]
RSET Voltage vs. VDD Pin Voltage
LED Current vs. RSET Resistor
1.30
100
80
60
40
20
0
1.25
1.20
1.15
1.10
3.0
3.5
4.0
4.5
5.0
5.5
0.1
1.0
10.0
100.0
VDD [V]
RSET [kΩ]
Doc. No. MD-5034 Rev. A
6
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT4008
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 5.0V, LED current 30mA, all LEDs On, TAMB = 25°C unless otherwise specified.
RSET Voltage vs. Temperature
1.30
LED Current vs. Temperature
31.5
31.0
30.5
30.0
29.5
29.0
28.5
1.25
1.20
1.15
1.10
-50
0
50
100
TEMPERATURE [°C]
150
-50
0
50
100
150
TEMPERATURE [°C]
Internal Pull-Down Current (LATCH pin)
Internal Pull-Up Current (BLANK pin)
30
30
25
20
15
10
5
25
20
15
10
5
0
0
0
1
2
3
4
5
0
1
2
3
4
5
BLANK VOLTAGE [V]
LATCH VOLTAGE [V]
BLANK Transient Response
PWM Dimming on BLANK pin (f = 10kHz)
100
80
60
40
20
0
0
5
10
15
20
25
30
LED CURRENT [mA]
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. MD-5034 Rev. A
CAT4008
PIN DESCRIPTION
Name
GND
Function
Ground
SIN
Serial data input pin
CLK
Serial clock input pin
LATCH
LED1-LED8
BLANK
SOUT
RSET
VDD
Latch serial data to output registers
LED channel 1 to 8 cathode terminals
Enable / disable all channels
Serial data output pin.
LED current set pin
Positive supply Voltage
PIN FUNCTION
GND is the ground reference pin for the device. This
pin must be connected to the ground plane on the PCB.
BLANK is the LED channel enable and disable
input pin. When low, LEDs are enabled according to
the output latch register content. When high, all
LEDs are off, while preserving the data in the output
latch register.
SIN is the serial data input. Data is loaded into the
internal register on each rising edge of CLK.
CLK is the serial clock input. On each rising CLK
edge, data is transferred from SIN to the internal 8-bit
serial shift register.
SOUT is the serial data output of the 8-bit serial shift
register. This pin is used to cascade several devices
on the serial bus. The SOUT pin is then connected to
the SIN input of the next device on the serial bus to
cascade.
LATCH is the latch data input. On the rising edge of
LATCH, data is loaded from the 8-bit serial shift
register into the output register latch. On the falling
edge, this data is latched in the output register and
isolated from the state of the serial shift register.
RSET is the LED current setting pin. A resistor is
connected between this pin and ground. Each LED
channel current is set to about 51 times the current
pulled out of the pin. The RSET pin voltage is regulated
to 1.2V.
LED1 – LED8 are the LED current sink channels.
These pins are connected to the LED cathodes. The
current sinks drive the LEDs with a current equal to
about 51 times RSET pin current. For the LED sink
to operate correctly, the voltage on the LED pin must
be above 0.4V.
VDD is the positive supply pin voltage for the entire
device. A small 1µF ceramic is recommended close
to pin.
CURRENT SETTING RESISTOR
Table 1 lists standard resistor values for various LED
current settings.
Table 1. LED Current and RSET resistor values
LED Current [mA]
RSET [kΩ]
6.19
10
20
30
40
60
80
3.09
2.05
1.54
1.02
0.768
Doc. No. MD-5034 Rev. A
8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT4008
BLOCK DIAGRAM
LED1 LED2 LED3
LED8
VDD
+
VIN
CURRENT
SINKS
RSET
GND
Current
Setting
BLANK
LATCH
1.2V Ref
LATCHES
L1
S1
L2
S2
L3
S3
L8
S8
SHIFT
REGISTER
SOUT
SIN
CLK
Figure 2. CAT4008 Functional Block Diagram
BASIC OPERATION
The CAT4008 uses 8 tightly matched current sinks to
accurately regulate the LED current in each channel.
The external resistor, RSET, is used to set the LED
Pull-up and pull-down resistors are internally provided
to set the state of the BLANK and LATCH pins to the
off-state when not externally driven.
1.2
SERIAL INTERFACE
LED current ≅ 51×
RSET
A high-speed serial 4-wire interface is provided to
program the state of each LED on or off. The
interface contains an 8-bit serial to parallel shift
register (S1-S8) and an 8-bit latch (L1-L8).
Programming the serial to parallel register is
accomplished via SIN and CLK input pins. On each
rising edge of the CLK signal, the data from SIN is
moved through the shift register serially. Data is also
moved out of SOUT which can be connected to a next
device if programming more then one device on the
same interface.
channel current to about 51 times the current in RSET
.
Tight current regulation for all channels is possible
over a wide range of input and LED voltages due to
independent current sensing circuitry on each
channel. The LED channels have a maximum dropout
of 0.4V for most current and supply voltage
conditions. This helps improve the heat dissipation
and efficiency of the LED driver.
Upon power-up, an under-voltage lockout circuit clears
all latches and shift registers and sets all outputs to off.
Once the under-voltage lockout threshold has been
reached the device can be programmed.
On the rising edge of LATCH, the data contents of the
serial to parallel shift register is reflected in the
latches. On the falling edge of LATCH, the state of the
serial to parallel register at that particular time is
saved in the latches and does not change irrespective
of the contents of the serial to parallel register.
The driver delays the activation of each consecutive
LED output channel by 17ns (typical). Relative to
LED1, LED2 is delayed by 17ns, LED3 by 34ns and
LED8 by 120ns typical. The delay is introduced when
LATCH is activated. The delay minimizes the inrush
current on the LED supply by staggering the turn on
and off current spikes over a period of time and
therefore allowing usage of smaller bypass capacitors.
BLANK is used to disable all LEDs (turn off)
simultaneously while maintaining the same data in the
latch register. When low, the LED outputs reflect the
data in the latches. When high, all outputs are high
impedance (zero current).
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. MD-5034 Rev. A
CAT4008
PACKAGE OUTLINE DRAWINGS
SOIC 16-Lead Narrow Body 150mils (W) (1)(2)
SYMBOL
MIN
NOM
MAX
1.75
0.25
0.51
0.25
10.00
6.20
4.00
A
A1
b
1.35
0.10
0.33
0.19
9.80
5.80
3.80
c
E1
E
D
E
9.90
6.00
E1
e
3.90
1.27 BSC
h
0.25
0.40
0º
0.50
1.27
8º
L
θ
PIN#1 IDENTIFICATION
TOP VIEW
D
h
θ
A
c
e
b
L
A1
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions in millimeters. Angle in degrees.
(2) Compiles with JEDEC MS-012
Doc. No. MD-5034 Rev. A
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT4008
SOIC 16-Lead Wide Body 300mils (V) (1)(2)
D
SYMBOL
MIN
NOM
MAX
2.64
0.30
0.51
0.28
10.49
10.64
7.59
A
A1
b
2.36
0.10
0.33
0.18
10.08
10.01
7.39
2.49
0.41
0.23
c
D
E
10.31
10.31
7.49
E1 E
E1
e
1.27 BSC
h
0.25
0.38
0º
0.75
1.27
8º
L
0.81
θ
PIN #1 IDENTIFICATION
TOP VIEW
h
c
A
θ
b
e
L
A1
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions in millimeters. Angle in degrees.
(2) Compiles with JEDEC MS-013.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. MD-5034 Rev. A
CAT4008
TSSOP 16-Lead 4.4mm (Y) (1)(2)
b
SYMBOL
MIN
NOM
MAX
1.10
0.15
0.95
0.30
0.20
5.10
6.50
4.50
A
A1
A2
b
0.05
0.85
0.19
0.13
4.90
6.30
4.30
c
E1
E
D
E
E1
e
0.65 BSC
1.00 REF
L
L1
θ1
0.45
0°
0.75
8°
e
PIN#1
IDENTIFICATION
TOP VIEW
D
c
A2
A1
A
θ1
L1
L
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions in millimeters. Angle in degrees.
(2) Compiles with JEDEC MO-153.
Doc. No. MD-5034 Rev. A
12
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT4008
EXAMPLE OF ORDERING INFORMATION
Prefix
CAT
Device #
Suffix
4008
W
–
T2
Optional
Company ID
Product Number
Package
Tape & Reel
T: Tape & Reel
1: 1000/Reel
2: 2000/Reel
4008
W: SOIC, 150mils
V: SOIC, 300mils (4)
Y: TSSOP (4)
(1)
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is Matte-Tin.
(3) The device used in the above example is a CAT4008W–T2 (SOIC 16-Lead 150 mils, Matte-Tin, Tape & Reel 2000).
(4) Contact factory for package availability.
(5) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
13
Doc. No. MD-5034 Rev. A
REVISION HISTORY
Date
Rev. Reason
Initial Issue
01/10/2008
A
Copyrights, Trademarks and Patents
© Catalyst Semiconductor, Inc.
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Document No: MD-5034
Revision:
A
Issue date:
01/10/08
相关型号：
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