CAT4008Y-GT2 [ONSEMI]
8-Channel Constant Current LED Driver; 8通道恒流LED驱动器
| 型号： | CAT4008Y-GT2 |
| 厂家： | 
ONSEMI |
| 描述： | 8-Channel Constant Current LED Driver |
| 文件： | 总13页 (文件大小：145K) |
| 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
Description
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 0.4 V (for 2 to
100 mA LED current) allows for more power efficient designs.
A high−speed 4−wire serial interface of up to 25 MHz 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.
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1
1
SOIC−16
W SUFFIX
SOIC−16
V SUFFIX
CASE 751BG
CASE 751BH
TSSOP−16
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.
Y SUFFIX
CASE 948AN
1
PIN CONNECTIONS
1
Features
GND
VDD
• 8 Constant Current−sink Channels
• Serial Interface up to 25 MHz Clock Frequency
• 3 V to 5.5 V Logic Supply
SIN
SCLK
XLAT
LED1
LED2
LED3
LED4
RSET
SOUT
BLANK
LED8
LED7
LED6
LED5
• LED Current Range from 2 mA to 100 mA
• LED Current set by External RSET Resistor
• 300 mV LED Dropout at 30 mA
16−Lead SOIC (W, V), TSSOP (Y)
• Thermal Shutdown Protection
(Top View)
• Available in 16−lead SOIC (150 and 300 mil wide), and TSSOP
Packages
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
MARKING DIAGRAMS
• Billboard Display
• Marquee Display
• Instrument Display
• General Purpose Display
A = Assembly Location
3 = Lead Finish − Matte−Tin
B = Product Revision (Fixed as “B”)
CAT4008W, CAT4008V, 4008Y = Device Code
Z or ZZ = Leave Blank
Y = Production Year (Last Digit)
M = Production Month (1-9, A, B, C)
XXX or XXXX = Last Three of Four Digits of
XXX or XXXX = Assembly Lot Number
A3B
CAT4008WZ
YMXXXX
AB
4008YZZ
3YMXXX
A3B
CAT4008VZ
YMXXXX
CAT4008W−T2
CAT4008Y−T2 or
CAT4008Y−GT2
CAT4008V−T1
©
Semiconductor Components Industries, LLC, 2010
1
Publication Order Number:
March, 2010 − Rev. 2
CAT4008/D
CAT4008
VIN
3 V to
5.5 V
20 mA
1 mF
VDD LED1 LED2
LED8
BLANK
LATCH
SIN
to next
device
CAT4008
SOUT
RSET
CLK
3.09 kW
GND
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Units
V
V
DD
Supply Voltage
6
Logic input/output voltage (SIN, SOUT, CLK, BLANK, LATCH)
LEDn voltage
−0.3 V to V +0.3 V
V
DD
6
V
DC output current on LED1 to LED8
Storage Temperature Range
150
mA
_C
_C
_C
−55 to +160
−40 to +150
300
Junction Temperature Range
Lead Soldering Temperature (10 sec.)
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
Range
3.0 to 5.5
0.4 to 5.5
up to 100
−40 to +85
Units
V
V
DD
Voltage applied to LED1 to LED8
LED current RSET control range
Ambient Temperature Range
V
mA
_C
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CAT4008
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(V = 5.0 V, T
= 25°C, over recommended operating conditions unless specified otherwise.)
DD
AMB
Symbol
Name
Conditions
Min
Typ
Max
Units
DC CHARACTERISTICS
I
LED Current (any channel)
18
36
20
22
44
mA
V
V
= 1 V, R
= 3.08 kW
LED−ACC
LED
SET
= 1 V, R
= 1.54 kW
= 769 W
40
LED
SET
V
= 1 V, R
80
LED
SET
I
LED Current Matching
1.5
1.5
2.0
0.1
%
V
V
= 1 V, R
= 1 V, R
= 3.08 kW
= 1.54 kW
LED−MAT
LED
LED
SET
SET
(I
− I
) / I
LED
LEDAVR LEDAVR
−6.0
+6.0
V
= 1 V, R
= 769 W
LED
SET
ΔI
VDD
LED current regulation vs. V
V within 4.5 V and 5.5 V
DD
% / V
% / V
mA
DD
LED current 30 mA
V within 1 V and 3 V
LED
ΔI
VLED
LED current regulation vs. V
0.05
LED
LED current 30 mA
I
Supply Current (all outputs off)
Supply Current (all outputs on)
2
8
9
R
SET
= 3.08 kW
DDOFF
R
SET
= 769 W
5.5
2.5
6.2
I
mA
R
= 3.08 kW
= 769 W
DDON
SET
R
SET
I
LEDn output Leakage
LATCH Pull−down Resistance
BLANK Pull−up Resistance
V
LED
= 5 V, outputs off
−1
1
mA
kW
kW
V
LKG
R
R
100
100
180
180
300
300
LATCH
BLANK
V
V
Logic high input voltage
Logic low input voltage
0.7xV
IH
DD
0.3xV
IL
DD
V
HYS
Logic input hysteresis voltage
0.1xV
V
DD
I
IL
Logic Input leakage current
(CLK, SIN)
V = V or GND
−5
0
5
mA
I
DD
V
V
SOUT logic high output voltage
SOUT logic low output voltage
I
= −1 mA
= 1 mA
V −0.3 V
CC
V
OH
OH
I
OL
0.3
OL
V
RSET Regulated Voltage
Thermal Shutdown
BLANK high, outputs off
1.17
1.20
160
20
1.23
V
RSET
T
°C
°C
SD
T
Thermal Hysteresis
HYST
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CAT4008
Table 4. TIMING CHARACTERISTICS
(For 3.0 V ≤ V ≤ 5.5 V, T
= 25°C, unless specified otherwise.)
DD
AMB
Min
Typ
Max
(Note 1)
(Note 2)
(Note 1)
Symbol
CLK
Name
Conditions
Units
f
CLK Clock Frequency
CLK Pulse Width High
CLK Pulse Width Low
25
MHz
ns
clk
t
20
20
cwh
t
ns
cwl
SIN
t
Setup time SIN to CLK
Hold time SIN to CLK
4
4
ns
ns
ssu
t
sh
LATCH
t
LATCH Pulse width
20
4
ns
ns
ns
lwh
T
Hold time LATCH to CLK
Setup time LATCH to CLK
lh
T
Channel Stagger Delay
400
lsu
LEDn
t
LED1 Propagation delay
LATCH to LED1 off/on
LED(n) to LED(n+1)
40
17
300
40
ns
ns
ns
ns
ns
ns
ld
t
LED Propagation delay stagger
LED Propagation delay stagger total
BLANK Propagation delay
ls
t
lst
LED1 to LED8
120
60
t
bd
BLANK to LED(n) off/on
Pull−up resistor = 50 W to 3.0 V
Pull−up resistor = 50 W to 3.0 V
300
200
250
t
LED rise time (10% to 90%)
LED fall time (90% to 10%)
40
lr
t
30
lf
SOUT
t
SOUT rise time (10% to 90%)
SOUT fall time (90% to 10%)
Propagation delay time SOUT
C = 15 pF
5
5
ns
ns
ns
or
L
t
C = 15 pF
L
of
t
od
CLK to SOUT
8
15
25
1. All min and max values are guaranteed by design.
2. V = 5 V, LED current 30 mA.
DD
1 mF
VDD
VDD
Rp
Rp
50 W
LED1
BLANK
LATCH
SIN
50 W
CAT4008
LED8
V1
CLK
SOUT
Cl
3 V
RSET
GND
15 pF
RSET
Figure 2. Test Circuit for AC Characteristics
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CAT4008
1/f
clk
CLK
SIN
t
t
sh
t
t
cwh
ssu
cwl
t
od
SOUT
LATCH
t
lh
t
lsu
t
lwh
Figure 3. Serial Input Timing Diagram
t
ld
LATCH
t
bd
BLANK
LED1
LED2
LED8
t
ls
t
lst
= 7 t
ls
Figure 4. LED Output Timing Diagram
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CAT4008
TYPICAL PERFORMANCE CHARACTERISTICS
(V = 5.0 V, LED current 30 mA, all LEDs On, T
= 25°C unless otherwise specified.)
DD
AMB
70
60
4.0
3.5
3.0
2.5
2.0
ALL LED’s ON
ALL LED’s OFF
50
40
30
20
1.5
1.0
10
0
0
0.3
0.6
0.9
1.2
1.5
5.5
5.5
3.0
3.5
4.0
VDD (V)
4.5
5.0
5.5
LED PIN (V)
Figure 5. LED Current vs. LED Pin Voltage
Figure 6. Supply Current vs. VDD Pin Voltage
31.5
31.0
30.5
30.0
29.5
8
7
6
5
ALL LED’s ON
ALL LED’s OFF
4
3
2
29.0
28.5
1
0
3.0
3.5
4.0
VDD (V)
4.5
5.0
0
0.5
1.0
1.5
2.0
RSET CURRENT (mA)
Figure 7. LED Current vs. VDD Pin Voltage
Figure 8. Supply Current vs. RSET Current
1.30
1.25
1.20
100
80
60
40
1.15
1.10
20
0
3.0
3.5
4.0
VDD (V)
4.5
5.0
0.1
1
10
100
RSET (kW)
Figure 9. RSET Voltage vs. VDD Pin Voltage
Figure 10. LED Current vs. RSET Resistor
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CAT4008
TYPICAL PERFORMANCE CHARACTERISTICS
(V = 5.0 V, LED current 30 mA, all LEDs On, T
= 25°C unless otherwise specified.)
DD
AMB
1.30
1.25
1.20
31.5
31.0
30.5
30.0
29.5
1.15
1.10
29.0
28.5
−50
0
50
TEMPERATURE (°C)
100
150
−50
0
50
100
150
TEMPERATURE (°C)
Figure 11. RSET Voltage vs. Temperature
Figure 12. LED Current vs. Temperature
30
25
20
15
30
25
20
15
10
10
5
0
5
0
0
1
2
3
4
5
0
1
2
3
4
5
LATCH VOLTAGE (V)
BLANK VOLTAGE (V)
Figure 13. Internal Pull−Down Current
Figure 14. Internal Pull−Up Current
(LATCH Pin)
(BLANK Pin)
100
80
60
40
20
0
0
5
10
15
20
25
30
LED CURRENT (mA)
Figure 15. PWM Dimming on BLANK Pin
(f = 10 kHz)
Figure 16. BLANK Transient Response
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CAT4008
Table 5. PIN DESCRIPTION
Name
Function
GND
SIN
Ground
Serial data input pin
CLK
Serial clock input pin
LATCH
LED1−LED8
BLANK
SOUT
RSET
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
VDD
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.
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.
CLK is the serial clock input. On each rising CLK edge, data
is transferred from SIN to the internal 8−bit serial shift
register.
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 1.2 V.
VDD is the positive supply pin voltage for the entire device.
A small 1 mF ceramic is recommended close to pin.
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 0.4 V.
Current Setting Resistor
Table 6 lists standard resistor values for various LED
current settings.
Table 6. LED CURRENT
AND RSET RESISTOR VALUES
LED Current [mA]
R
SET
[kW]
10
20
30
40
60
80
6.19
3.09
2.05
1.54
1.02
0.768
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CAT4008
Block Diagram
LED1 LED2 LED3
LED8
VDD
+
VIN
CURRENT
SINKS
RSET
GND
Current
Setting
BLANK
LATCH
1.2 V Ref
LATCHES
L1
S1
L2
S2
L3
S3
L8
S8
SHIFT
REGISTER
SOUT
SIN
CLK
Figure 17. 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, R , is used to set the LED channel
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.
SET
current to about 51 times the current in R
.
SET
Serial Interface
1.2
LED current ^ 51
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 than one device on the same interface.
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.
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 0.4 V 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.
The driver delays the activation of each consecutive LED
output channel by 17 ns (typical). Relative to LED1, LED2
is delayed by 17 ns, LED3 by 34 ns and LED8 by 120 ns
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).
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CAT4008
PACKAGE DIMENSIONS
SOIC−16, 150 mils
CASE 751BG−01
ISSUE O
SYMBOL
MIN
NOM
MAX
1.35
A
1.75
A1
b
0.10
0.33
0.19
0.25
0.51
0.25
c
D
E
E1
e
9.80
5.80
3.80
9.90
6.00
10.00
6.20
4.00
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
q
A
c
e
b
L
A1
END VIEW
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
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CAT4008
PACKAGE DIMENSIONS
SOIC−16, 300 mils
CASE 751BH−01
ISSUE A
D
SYMBOL
MIN
NOM
MAX
2.36
2.49
2.64
A
A1
b
0.10
0.33
0.18
0.30
0.51
0.28
0.41
0.23
c
D
10.08
10.01
7.39
10.31
10.31
7.49
10.49
10.64
7.59
E1 E
E
E1
e
1.27 BSC
h
0.25
0.38
0º
0.75
1.27
8º
0.81
L
θ
PIN #1 IDENTIFICATION
TOP VIEW
h
c
q
A
b
e
L
A1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-013.
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CAT4008
PACKAGE DIMENSIONS
TSSOP16, 4.4x5
CASE 948AN−01
ISSUE O
b
SYMBOL
MIN
NOM
MAX
A
A1
A2
b
1.10
0.15
0.95
0.30
0.20
5.10
6.50
4.50
0.05
0.85
0.19
0.13
4.90
6.30
4.30
E1
E
c
D
E
E1
e
0.65 BSC
1.00 REF
L
L1
0.45
0.75
0º
8º
θ
e
PIN#1
IDENTIFICATION
TOP VIEW
D
c
A2
A1
A
θ1
L1
L
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-153.
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CAT4008
Example of Ordering Information (Note 5)
Prefix
Device #
Suffix
CAT
4008
Y
− G
T2
Company ID
(Optional)
Product Number
Package
Lead Finish
G: NiPdAu
Blank: Matte−Tin (Note 6)
Tape & Reel (Note 8)
T: Tape & Reel
1: 1,000 / Reel
4008
W: SOIC, 150 mils
V: SOIC, 300 mils (Note 6)
Y: TSSOP (Note 6)
2: 2,000 / Reel
Table 7. ORDERING INFORMATION
Part Number
CAT4008W-T2
CAT4008V-T1
CAT4008Y-T2
CAT4008Y-GT2
Package
Quantity per Reel
Package Marking
CAT4008W
CAT4008V
SOIC16 (N) (Note 9)
SOIC16 (W) (Notes 6, 9)
TSSOP16 (Notes 6, 9)
TSSOP16 (Note 10)
2,000
1,000
2,000
2,000
CAT4008Y
CAT4008Y
3. All packages are RoHS−compliant (Lead−free, Halogen−free).
4. The standard lead finish is Matte−Tin.
5. The device used in the above example is a CAT4008Y−GT2 (TSSOP, NiPdAu, Tape & Reel, 2,000/Reel).
6. Contact factory for package availability.
7. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
8. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
9. Matte−Tin Plated Finish (RoHS−compliant).
10.NiPdAu Plated Finish (RoHS−compliant).
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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CAT4008/D
相关型号：
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