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LD71D0016
16 Channel Constant current output LED Driver
16 Channel Constant current output LED Driver
LD71D0016
Data Sheet
2004. 4
SD-2001A
1/13
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LD71D0016
16 Channel Constant current output LED Driver
DESCRIPTION
The LD71D0016 is specifically designed for LED and LED DISPLAY constant current drivers. This constant current output circuit is able to set up external resistor (IOUT = 5mA to 90mA). The devices consist of 16bit shift register, latch, and-gate and constant current driver.
SDIP24-P-300 Weight : 1.20g (Typ.)
FEATURES
* Output current : set-up at 5mA to 90mA with an external resistor * A little change of output current
OUT-GND VOLTAGE > 0.7V + 6% > 1.0V A LITTLE CHANGE OF CHANNEL IOUT (mA) 5mA ~40mA 5mA ~90mA
GND DIN CLOCK STROBE OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDD R-EXT DOUT OE OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8
* 5V CMOS Compatible Input * Package : SDIP-24, PDIP-24, SSOP-24, SOP-24 * Maximum Clock Frequency : fMAX = 25MHz
PIN CONNECTIONS (TOP VIEW)
PIN DESCRIPTION
PIN NO. 1 2 3 4 24 5~12 13~20 21 22 23 PIN NAME GND DIN CLOCK STROBE VDD OUTn OE DOUT R-EXT DESCRIPTION GND terminal for control logic driver Serial data input terminal for shift register Clock input terminal for data shift to up-edge "H" level : data through, "L" level : data hold Supply voltage terminal Output terminals "H" level output off, "L" level : latch data = "H" level then output on, latch data = "L" level then output off Serial data output terminal for shift register The resistor which connects between R-EXT and GND sets the constant output current.
SD-2001A
2/13
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LD71D0016
16 Channel Constant current output LED Driver
BLOCK DIAGRAM
OUT0 OUT1 OUT15 * CONSTANT CURRENT DRIVER
LD71D0016
*
R-EXT I-REF
*
*
OE Q CK D STROBE DIN D CK CLOCK Q D CK Q D CK Q DOUT Q CK D Q CK D
TIMING DIAGRAM
1
CLOCK DIN STROBE OE OUT0 OUT1 OUT2 OUT14 OUT15 DOUT
ON OFF ON OFF ON OFF ON OFF ON OFF
2
3
4
13
14
15
16
TRUTH TABLE
INPUT CLOCK STROBE H L * * OE L L H * DIN Dn Dn Dn Dn OFF OUT0 Dn OUTPUT OUTn (t =n) OUT7 Dn-7 No change OFF No change OFF OUT15 Dn-15 DOUT Dn-15 Dn-15 Dn-15 No Change
(Note) Dn~Dn-15 = "H" then OUTn is ON, "L" then OUTn is OFF
SD-2001A
3/13
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LD71D0016
16 Channel Constant current output LED Driver
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS (Ta = 25oC)
PARAMETER Supply Voltage Output Voltage Output current Input Voltage GND Terminal Current Clock Frequency Power Dissipation Operating Temperature Storage Temperature SYMBOL VDD VOUT IOUT VIN IGND fCK PD Topr Tstg RATING 0~7.0 -0.5~8.0 90 -0.4~VDD+0.4 1440 25 1.78 -40~85 -55~150 UNIT V V mA V mA MHz W
oC oC
(Note ) Ambient temperature delated above 25oC in the proportion of 14.2mW/ oC
RECOMMENDED OPERATING CONDITION (Ta = 25oC unless otherwise noted)
PARAMETER Supply Voltage Output Voltage SYMBOL VDD VOUT CONDITION Cascade Operation Ta = 85 C
o
MIN. 4.5 0 20 20 20 20 15 15 20 20 -
TYP. 5.0 -
MAX. 5.5 8.0 90 -1.0 1.0 VDD -
UNIT V -
OUTn
Output Voltage
IOUT IOH IOL
DOUT
Input Voltage Data Set Up Time Data Hold Time STROBE Set UP Time STROBE Hold Time
mA
VIN tsetup (D) thold (D) tsetup(S)
thold (S)
V ns ns ns ns ns
Clock Pulse Width
tw CLK tw CLK
ns 25.0 0.74 MHz W
Strobe Pulse Width
Clock Pulse Width Power Dissipation
tw STB tw STB fCK PD
SD-2001A
4/13
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LD71D0016
16 Channel Constant current output LED Driver
ELECTRICAL CHARACTERISTICS (Ta = 25oC unless otherwise noted) (continued)
PARAMETER
"H" Level "L" Level
SYMBOL VIH VIL IOZ
TEST CIRCUIT
-
TEST CONDITION
VOH = 6.0V REXT = 14kU REXT = 14 kU IOUT = 40mA, VOUT = 1V REXT = 7.0 kU REXT = 7.0 kU IOUT = 75mA, VOUT = 1V REXT= 14 kU REXT=14 kU ,Ta =-40~85oC REXT = OPEN, OUTn = OFF REXT = 14 kW, OUTn = OFF REXT = 7.0 kW, OUTn = OFF
MIN.
0.7VDD GND
TYP.
-
MAX.
VDD 0.3VDD 1 0.2VDD 43.0 + 6.0 80.0 + 6.0 5.0 400
UNIT
Input Voltage Output Leakage current Output Voltage Output Current1
V
uA
DOUT
VOL VOH IOL1
0.8VDD 37 70.0 100 100 0.5 1.0
40.0 + 1.5 75.0 + 1.5 1.5 1.12 200 200 0.3 1.0 2.0
V mA % mA % %/V V kW
Delta IOUT Output Current2 Delta IOUT Supply Voltage Regulation Reference Voltage Pull up resistor Pull down resistor
IOL1 IOL2 IOL2 %/VDD Vref RIN(up) RIN(down) IDD (off) 1
400 0.6 1.5 mA 3.0 V
Supply current
IDD (off) 2 IDD (off) 3
DC CHARACTERISTIC TEST CIRCUIT
IDD IIN IIH IIL VDD
OE STROBE DIN OUT0
IOL
LD71D0016
R-EXT GND
OUT15 DOUT
VIN VIH VIL
Iref
SD-2001A
5/13
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LD71D0016
16 Channel Constant current output LED Driver
AC CHARACTERISTIC TEST CIRCUIT
VIH
SW-MATRIX
VDD
CLOCK STROBE OE DIN R-EXT GND
RL OUT0 CL OUT15 DOUT CL VL
LD71D0016
VIL
SWITCHING CHARACTERISTICS (Ta = 25OC unless otherwise noted)
PARAMETER CK-DOUT Propagation Delay Time ("L" to "H") CK-OUTn STROBEOUTn OE-OUTn CK-DOUT Propagation Delay Time ("H" to "L") CK-OUTn STROBEOUTn OE-OUTn Maximum Clock Frequency Propagation Delay Time ("H" to "L") Clock STROBE SYMBOL TEST CIRCUIT TEST CONDITION MIN. TYP. 30 600 600 600 30 350 350 350 10 20 10 10 10 10 0 10 0 300 150 MAX. UNIT
-
70 1500 ns 1500 1500 70 1000 ns 1000 1000 25 50 ns 40 30 ns 30 20 ns 20 20 ns 20 10 ns 10 1000 ns 600 MHz
tPLH
-
tPHL
-
fCKMAX (*1) tWCK tW STB tsetup (D) thold (D)
-
Data Set Up Time Data Hold Time STROBE Set up Time STROBE Hold Time LH HL LH HL
VDD = 5.0V VOUT = 1.0V VIH = VDD VIL = GND fCK = 10MHz REXT = 10 kU IOUT = 40mA VL = 3.0V CL = 10.0pF RL = 65U
-
t STB setup
-
t STB hold tr tf tor tof
-
Maximum Clock Rise Time Maximum Clock Fall Time Minimum Output Rise Time Minimum Output Rise Time *1 : Cascade Operation
SD-2001A
6/13
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LD71D0016
16 Channel Constant current output LED Driver
TIMING WAVE FORM
CLOCK-DOUT, OUTn
tr tw
CLOCK H L
90% 50% 10% 90% 50% 10% 50%
tf
tsetup
H DATA L
50%
tHold
50%
tor
H DOUT OUTn
on
tof
90% 50% 10%
L
off
90% 50% 10%
tpLH
tpHL
CLOCK-STROBE
H CLOCK L H DATA L H STROBE L on OUTn off
50%
tsetup
50%
OE
H OE L on OUTn off
50% 50% 50% 50%
tpLH
tpHL
SD-2001A
7/13
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LD71D0016
16 Channel Constant current output LED Driver
EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS
1. OE terminal
VDD
2. STROBE terminal
VDD
OE
STROBE
GND
GND
3. CLOCK, DIN terminal
VDD CLOCK, DIN GND
4. DOUT terminal
VDD
DATA
DOUT
GND
OUTPUT CURRENT
90 80 70
IOUT (mA/bit)
VS. AMBIENT
TEMPERATURE
90 80 70
IOUT (mA/bit) IOUT - Duty Cycle
Ta - IOUT
60 50 40 30 20 10 0
0 VDD = 5V Tj = 120oC(Max) 16Bit Active 10 20 30 40 50 60 70 80 90 VO = 0.7(V) VO = 1.0(V)
60 50 40 30 20 10 0
0 VDD = 5V Tj = 120oC(Max) 16Bit Active O Ta =25 C 10 20 30 40 50 60 70 80 90 VO = 0.7(V) VO = 1.0(V)
Ta (oC)
Ta
(oC)
90 80 70
IOUT (mA/bit)
IOUT - Duty Cycle
90 80 70
IOUT (mA/bit)
IOUT - Duty Cycle
60 50 40 30 20 10 0
0 VDD = 5V Tj = 120oC(Max) 16Bit Active Ta =60oC 10 20 30 40 50 60 70 80 90 VO = 0.7(V) VO = 1.0(V)
60 50 40 30 20 10 0
0 VDD = 5V Tj = 120oC(Max) 16Bit Active Ta =85 oC 10 20 30 40 50 60 70 80 90 VO = 0.7(V)
VO = 1.0(V)
Ta (oC)
Ta (oC)
SD-2001A
8/13
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LD71D0016
16 Channel Constant current output LED Driver
OUTPUT CURRENT AND REXT
A VREF CHIP1 REXT REXT CHIP2 REXT REXT V1 CHIP15 REXT REXT CHIP16 REXT REXT
+ -
1.2V
RINT
I1
I2
I15
I16
VSS
REXT REXT
RVAR
VSS
ITOTAL = I1 + I2 + ... + I15 + I16 IF I1=I2= ...= I15=I16 ITOTAL = 16 * I1
V1 DETAILED OF A
When RVAR is closing to 0 Ohm, the current through LED(ILED) reaches to maximum value then the Maximum Current Limitation(ILED_MAX) value can be determined with REXT resistor. The LD71D0016 has RINT resistor(1 kOhm) internally to protect device from excessive current and RINT is connected to REXT port serially.
I1 = ( VREF - V1 ) / ( RINT + REXT ) V1 = 16 * I1 * RVAR = 16 * [( VREF - V1 ) / ( RINT+ REXT )] * RVAR ILED = 500 * I1 = 500 * ( VREF - V1 ) / ( RINT + REXT )
At RVAR is 0 Ohm(V1 voltage is 0 V), the ILED_MAX value can be measured. Knowing the ILED_MAX and ILED_MIN, the REXT and the RVAR value are calculated using above formula and determined with taking the operating tolerance into considerations.
REXT - IOUT
100 90 80 70 60 50 40 30 20 10 0
6K7K 9K 10K 15K
REXT 6 kOhm 7 kOhm 9 kOhm 11 kOhm 14 kOhm 19 kOhm 29 kOhm 59 kOhm
20K 30K 60K
IOUT (mA)
IOUT 85mA 75mA 60mA 50mA 40mA 30mA 20mA 10mA
VO = 1.0(V)
REXT (Ohm)
SD-2001A
9/13
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LD71D0016
16 Channel Constant current output LED Driver
TYPICAL APPLICATION
VDD = 5V VLED = 5V
0 CLOCK DIN STROBE OE R-EXT GND DOUT OUT0 IO
7
15
LD71D0016
OUT7 OUT15
I7 I15
CPU
0 CLOCK DIN OUT0 STROBE OE R-EXT GND DOUT IO
7
15
LD71D0016
OUT7 OUT15
I7 I15
IO = I7 = I15 NEXT DIN
SD-2001A
10/13
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LD71D0016
16 Channel Constant current output LED Driver
PACKAGE INFORMATION
SDIP24-P-300-1.78
0~15o 6.4 + 0.2 7.62 3.5 + 0.2 4.2 + 0.3 3.0 + 0.3 0.51MN 0.18 M
24
13
1
12
2.0 + 5 MAX 22.0 + 0.2
1.221 Typ 1.778
1.0 + 0.1
0.46 + 0.1
Unit : mm
P-DIP 24
1.250 + 0.03
q=7~15o
0.258 + 0.025
0.25+0.1 -0.05
0.130 + 0.05
0.130 + 0.02
SETING PLANE 0.210
0.018typ 0.050typ
0.100typ
Unit : inch
SD-2001A
0.355+ 0.02
0.300
11/13
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LD71D0016
16 Channel Constant current output LED Driver
PACKAGE INFORMATION (continued)
SSOP 24 - 300
0.05 MIN 1.75 + 0.10 (0.069 + 0.004) 0.45 +0.50 (0.018 + 0.004,- 0.002) (0.002 MIN)
#1
#24
(0.598 + 0.008)
(0.614 MAX)
15.20 + 0.20
15/60 MAX
#12
#13
7.90 + 0.30 (0.311 + 0.012)
2.00 MAX 0.079 MAX
(0.008, + 0.004, - 0.002)
5.30 + 0.20 (0.209 + 0.008)
0.20
+ 0.10 - 0.05
7.62 (0.300)
8 0~
o
0.60 + 0.20 (0.024 + 0.008)
Unit : mm (inch)
SD-2001A
1.27 (0.050)
+-.10
12/13
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LD71D0016
16 Channel Constant current output LED Driver
PACKAGE INFORMATION (continued)
SOP 24
MIN0.05 (MINO.002)
(0.027) (0.015, + 0.004,- 0.002) 0.69
#1
#24
(0.604 + 0.008)
15.34 + 0.20
(0.620MAX)
15/74MAX
#12
#13
10.30 + 0.30 (0.406 + 0.012)
(0.008, + 0.004, - 0.002)
2.35 + 0.10 (0.093 + 0.004) 2.60MAX
7.50 + 0.20 (0.295 + 0.008)
(0.102MAX)
0.20
+ 0.10 - 0.05
9.53 (0.375) 0.87 + 0.20 (0.034 + 0.008)
8 0~
o
Unit : mm (inch)
SD-2001A
(0.050)
1.27
0.38
+0.10 -0.05
13/13

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