Texas Instruments TLC5921DAPR, TLC5921DAP Datasheet

TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Drive Capability and Output Counts
– 80 mA (Current Sink) x 16 Bits

D

Constant Current Output Range
– 1 to 80 mA (C urrent Value Setting for All

Output Terminals Using External Resistor)

D

Constant Current Accuracy
– ±1% (Typ)
– ±4% (Max) (Maximum Error Between

Bits, All Bits On)

D

Voltage Applied to Constant Current Output
Terminal
– Minimum 0.6 V (Output Current 40 mA)
– Minimum 1 V (Output Current 80 mA)

D

Data Input
– Clock Synchronized 1 Bit Serial Input

D

Data Output
– Clock Synchronized 1 bit Serial Output

(With Timing Selection)

D

Input/Output Signal Level . . . CMOS Level

D

Power Supply V oltage . . . 4.5 V to 5.5V

D

Maximum Output Voltage . . . 17 V (Max)

D

Data Transfer Rate . . . 20 MHz (Max)

D

Operating Free-Air Temperature Range
–20°C to 85°C

D

Available in 32 Pin HTSSOP DAP Package
(PD=3.9 W,
T

A

= 25°C)

D

LOD Function . . . LED Open Detection
(Error Signal Output at LED Disconnection)

D

TSD Function . . . Thermal Shutdown (Turn
Output Off When Junction Temperature
Exceeds Limit)

description

The TLC5921 is a current-sink constant current driver incorporating shift register and data latch. The current
value at constant current output can be set by one external register. The device also incorporates thermal
shutdown (TSD) circuitry which turns constant current output off when the junction temperature exceeds the
limit, and LED open detection (LOD) circuitry to report the LED was disconnected.

Copyright  1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1
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11
12
13
14
15
16

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

GND

BLANK

XLAT

SCLK

SIN

PGND

OUT0
OUT1

PGND

OUT2
OUT3
OUT4
OUT5

PGND

OUT6
OUT7

VCC
IREF
SOMODE
XDOWN
SOUT
PGND
OUT15
OUT14
PGND
OUT13
OUT12
OUT11
OUT10
PGND
OUT9
OUT8

(TOP VIEW)

DAP PACKAGE

TLC5921
LED DRIVER

SLLS390 – SEPTEMBER 1999

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

functional block diagram

Timing Selector

16 bits

Data Latch

XLAT

SOUT

OUT0 OUT15

SOMODE

SCLK

SIN

16 bits

Shift Register

16 bits Constant Current Driver

and

LED Disconnection detection

BLANK

IREF

TSD

XDOWN

VCC

GND

PGND

100 kΩ

100 kΩ

TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

equivalent input and output schematic diagrams

VCC

Input (except SCLK)

INPUT

GND

SOUT

VCC

OUTPUT

GND

XDOWN

GND

XDOWN

OUTn

GND

OUTn

VCC

INPUT

GND

Input (SCLK)

TLC5921
LED DRIVER

SLLS390 – SEPTEMBER 1999

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

SIN

5

I

1 bit serial data input

SOUT

28

O

1 bit serial data output

ÁÁÁÁ

Á

SCLK

ÁÁÁÁ

Á

4

Á

Á

I

ББББББББББББББББББББ

Á

Clock input for data transfer. All the data in the shift register is shifted to MSB by 1 bit
synchronizing to the rising edge of SCLK, and data at SIN is shifted to LSB at the same time.
(Schmitt buffer input)

ÁÁÁÁ

Á

ÁÁÁÁ

Á

XLAT

ÁÁÁÁ

Á

ÁÁÁÁ

Á

3

Á

Á

Á

Á

I

ББББББББББББББББББББ

Á

ББББББББББББББББББББ

Á

Latch. When XLAT is high, data on shift register goes through latch. When XLA T is low, data
is latched. Accordingly, if data on shift register is changed during XLA T high, this new value
is latched (level latch). This terminal is internally pulled down with 100kΩ.

ÁÁÁÁ

Á

SOMODE

ÁÁÁÁ

Á

30

Á

Á

I

ББББББББББББББББББББ

Á

Timing select for serial data output. When SOMODE is low , output data on SOUT is changed
synchronizing to the rising edge of SCLK. When SOMODE is high, output data on SOUT
is changed synchronizing to the falling edge of SCLK.

ÁÁÁÁ

Á

OUT0 – OUT15

ÁÁÁÁ

Á

7,8,10,1 1,12,13,

15,16,17,18,20,

21,22,23,25,26

Á

Á

O

ББББББББББББББББББББ

Á

Constant current output.

ÁÁÁÁ

Á

BLANK

ÁÁÁÁ

Á

2

Á

Á

I

ББББББББББББББББББББ

Á

Blank(Light off). When BLANK is high, all the output of constant current driver is turned off.
When BLANK is low and data written to latch is 1, the corresponding constant current output
turns on (LED on). This terminal is internally pulled up with 100kΩ.

ÁÁÁÁ

Á

IREF

ÁÁÁÁ

Á

31

Á

Á

I

ББББББББББББББББББББ

Á

Constant current value setting. LED current is set to desired value by connecting external
resistor between IREF and GND. The 38 times current compared to current across external
resistor sink on output terminal.

ÁÁÁÁ

Á

XDOWN

ÁÁÁÁ

Á

29

Á

Á

O

ББББББББББББББББББББ

Á

Error output. XDOWN is configured as open collector. It goes low when TSD or LOD
functions.

VCC

32

Power supply voltage

GND

1

Ground

PGND

6,9,14,19,24,27

Ground for LED driver. (Internally connected to GND)

THERMAL PAD

package bottom

Heat sink pad. This pad is connected to the lowest potential to IC or thermal layer.

absolute maximum ratings (see Note 1)

†

Supply voltage, VCC – 0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output current (dc), I

O(LC)

90 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI – 0.3 V to V

CC

+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, V

O(SOUT)

, V

O(XDOWN)

– 0.3 V to V

CC

+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, V

O(OUTn)

– 0.3 V to 18 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–40°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation at (or below) TA = 25°C 3.9 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power dissipation rating at (or above) TA = 25°C 31.4 mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to GND terminal.

TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

dc characteristics

PARAMETER

CONDITIONS

MIN

NOM

MAX

UNIT

Supply voltage, V

CC

4.5

5

ÁÁÁ

5.5

V

Voltage applied to constant current output, V

O

OUT0 to OUT15 off

ÁÁÁ

17

V

High-level input voltage, V

IH

0.8 VCC

ÁÁÁ

VCC

V

Low-level input voltage, V

IL

GND

ÁÁÁ

0.2 VCC

V

High-level output current, I

OH

VCC = 4.5 V, SOUT

ÁÁÁ

–1

Low-level output current, I

OL

VCC = 4.5 V, SOUT, XDOWN

ÁÁÁ

1

mA

Constant output current, I

O(LC)

OUT0 to OUT15

ÁÁÁ

80

mA

Operating free-air temperature range, T

A

–20

ÁÁÁ

85

°C

ac characteristics, MIN/MAX: V

CC

= 4.5 V to 5.5 V, TA = –20 to 85°C

TYP: V

CC

= 5 V, TA = 25°C (unless otherwise noted)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

At single operation

20

f

SCLK

SCLK clock frequenc

y

At cascade operation (SOMODE = L)

15

MH

z

twh/twlSCLK pulse duration

20

ns

t

wh

XLAT pulse duration

10

ns

tr/t

f

Rise/fall time

100

ns

p

SIN – SCLK

5

tsuSetup time

XLAT – SCLK

5

ns

SIN – SCLK

20

thHold time

XLAT – SCLK

20

ns

TLC5921
LED DRIVER

SLLS390 – SEPTEMBER 1999

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics, MIN/MAX: V

CC

= 4.5 V to 5.5 V, T

A

= – 20 to 85°C

TYP: V

CC

= 5 V, T

A

= 25°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁ

Á

V

OH

БББББББББ

Á

High-level output voltage

ББББББББББ

Á

IOH = – 1 mA

Á

Á

V

CC

–0.5V

ÁÁÁÁÁ

Á

V

V

OL

Low-level output voltage

IOL = 1 mA

0.5

V

I

I

Input current

VI = VCC or GND (except BLANK, XLAT)

± 1

µA

ÁÁÁÁБББББББББÁББББББББББ

Á

Input signal is static, VO = 1 V,
R

(IREF)

= 10 kΩ, All output bits turn off

ÁÁÁ

Á

3

Á

Á

4.5

Á

Á

ÁÁÁÁБББББББББÁББББББББББ

Á

Input signal is static, VO = 1 V
R

IREF

= 1300 Ω, All output bits turn off

ÁÁÁ

Á

7

Á

Á

9

Á

Á

I

CC

Supply current

Input signal is static, VO = 1 V,
R

(IREF)

= 640 Ω, All output bits turn off

11

15

mA

ÁÁÁÁБББББББББÁББББББББББ

Á

Data transfer, VO = 1 V,
R

(IREF)

= 1300 Ω, All output bits turn on

ÁÁÁ

Á

15

Á

Á

20

Á

Á

Data transfer, VO = 1 V,
R

(IREF)

= 640 Ω, All output bits turn on

35

50

I

OL(C1)

Constant output current

VO = 1 V, R

(IREF)

= 1300 Ω

35

40

45

mA

I

OL(C2)

Constant output current

VO = 1 V R

(IREF)

= 640 Ω

70

80

90

mA

p

OUT0 to OUT15 (V

(OUTn)

= 15 V)

0.1

µA

I

lkg

Constant output leakage current

XDOWN (5V pullup)

1

µA

∆I

O(LC)

Constant output current error between bit

VO = 1 V, R

(IREF)

= 640 Ω,

All output bits turn on

± 1

± 4

%

ÁÁÁ

Á

I∆

O(LC1)

БББББББББ

Á

Changes in constant output current
depend on supply voltage

ББББББББББ

Á

V

ref

= 1.3 V

ÁÁÁ

Á

± 1

Á

Á

± 4

Á

Á

%/V

ÁÁÁ

Á

I∆

O(LC2)

БББББББББ

Á

Changes in constant output current
depend on output voltage

ББББББББББ

Á

VO = 1 V to 3 V , R

(IREF)

= 1300 Ω,

V

ref

= 1.3 V, 1 bit output turn on

ÁÁÁ

Á

± 2

Á

Á

± 6

Á

Á

%/V

T(

tsd)

TSD detection temperature

Junction temperature

150

160

170

°C

V

ref

Reference voltage

R

(IREF)

= 640 Ω

1.3

V

V

(LEDDET)

LED disconnection detection voltage

0.3

V

switching characteristics, CL = 15 pF

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SOUT

15

20

trRise time

OUTn (see Figure 1)

300

ns

SOUT

5

15

tfFall time

OUTn

300

ns

BLANK↑ – OUTn

400

650

BLANK↓ – OUTn

300

400

t

pd

Propagation delay time

BLANK↑ – XDOWN (see Note 2)

600

1000

ns

BLANK↓ – XDOWN (see Note 2)

500

1000

SCLK – SOUT

10

20

35

NOTE 2: At external resistor 5 kΩ

TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

V

CC

IREF OUTn

GND

V

CC

51 Ω

15 pF

1300 Ω

Figure 1. Rise Time and Fall Time Test Circuit for OUTn

t

f

50%

t

r

90%

10%

VIH or V

OH

VIL or V

OL

100%

0%

VIH or V

OH

VIL or V

OL

50%

100%

0%

VIH or V

OH

VIL or V

OL

t

d1

t

wh

t

wl

50%

100%

0%

V

IH

V

IL

100%

0%

Figure 2. Timing Requirements

TLC5921
LED DRIVER

SLLS390 – SEPTEMBER 1999

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

setting for constant output current value

The constant current value is determined by external resistor, R

(IREF)

between IREF and GND. Refer constant

output current characteristics shown on Figure 5 for this external resistor value.
Note that more current flows if connect IREF to GND directly.

constant output current operation

When BLANK is low, the corresponding output is turned on if data latch value is 1, and turned off if data latch
value is 0. When BLANK is high, all outputs are forced to turn off. If there is constant current output terminal
left unconnected (includes LED disconnection), it should be lighted on after writing zero to corresponding data
latch to its output. If this operation is not done, supply current through constant current driver will increase.

shift register latch

The shift register latch is configured with 16 × 1 bits. The 1 bit for constant current output data represents ON
for constant current output if data is 1, or OFF if data is 0. The configuration of shift register latch is shown in
below.

(1 bits)

OUT15

Data

XLATCH

(1 bits)

OUT14

Data

(1 bits)

OUT1

Data

(1 bits)

OUT0

Data

Data Latch

16

SOUT

Shift Register

15 2 1

SIN

SCLK

Figure 3. Relationship Between Shift Register and Latch

SOUT output timing selection

By setting level of SOMODE, the SOUT output timing can be changed. When SOMODE is set to low, data is
clocked out to SOUT synchronized on the rising edge of SCLK, and when SOMODE is set to high, data is
clocked out to SOUT synchronized on the falling edge of SCLK. When SOMODE is set to high and shift
operation is done, the data shift error can be prevented even though SCLK signal is externally buffered in serial.
Note that the maximum data transfer rate in cascade operation is slower than that when SMODE is set to low.

TSD (thermal shutdown)

When the junction temperature exceeds the limit, TSD starts to function and turn constant current output off and
XDOWN goes low. Since XDOWN is configured with open-collector output, the outputs of multiple ICs can be
concatenated. To recover from constant current output off-state to normal operation, power supply should be
turned off and then turned on after several seconds.

TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

LOD function (LED open detection)

If any terminal voltage of constant current output (OUT0 TO 15) to be turned on is approximately below 0.3 V,
XDOWN output goes low during output on by knowing LED disconnection. This function is operational for
sixteen OUTn individually. To know which constant current output is disconnected, the level of XDOWN is
repeatedly checked 16 times from OUT0 to OUT15 turning one constant current output on. The power supply
voltage for LED should be set to that the constant current output is applied to above 0.4 V to prevent from
XDOWN low when LED is lighting on normally. Note that on-time should be minimum1µs after the constant
current output is turned on since XDOWN output is required approximately 1 µs.

As discussed earlier, XDOWN is used for both TSD and LOD function. Therefore, BLANK is used to know which
one of TSD or LOD worked when XDOWN went low at LED disconnection, that is, in this condition, when set
BLANK to high, all the constant current outputs are turned off and LOD disconnection detection is disabled, then,
if XDOWN was changed to high, LED disconnection must be occurred.

Table 1 is an example for XDOWN output status using four LEDs.

Table 1. XDOWN Output Example

LED NUMBER

1

2

3

ÁÁÁÁ

4

LED STATUS

GOOD

NG

GOOD

ÁÁÁÁ

NG

OUTn

ON

ON

ON

ÁÁÁÁ

ON

DETECTION RESULT

GOOD

NG

GOOD

ÁÁÁÁ

NG

XDOWN

LOW (by case 2, 4)

LED NUMBER

1

2

3

ÁÁÁÁ

4

LED STATUS

GOOD

NG

GOOD

ÁÁÁÁ

NG

OUTn

ON

ON

OFF

OFF

DETECTION RESULT

GOOD

NG

GOOD

ÁÁÁÁ

GOOD

XDOWN

LOW (by case 2)

LED NUMBER

1

2

3

ÁÁÁÁ

4

LED STATUS

GOOD

NG

GOOD

ÁÁÁÁ

NG

OUTn

OFF

OFF

OFF

ÁÁÁÁ

OFF

DETECTION RESULT

GOOD

GOOD

GOOD

ÁÁÁÁ

GOOD

XDOWN2

HIGH–IMPEDANCE

noise reduction : output slope

When output current is 80 mA, the time to change constant current output to turn-on and turn-off is approximately
150 ns and 250 ns respectively. This allows to reduce concurrent switching noise occurred when multiple
outputs turn or off at the same time.

thermal pad

The thermal pad should be connected to GND to eliminate the noise influence since it is connected to the bottom
side of IC chip. Also, desired thermal effect will be obtained by connecting this pad to the PCB pattern with better
thermal conductivity .

TLC5921
LED DRIVER

SLLS390 – SEPTEMBER 1999

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

power rating – free-air temperature

2.0

3.9

TA – Free–Air Temperature – °C

0 25 85–20

1.48

3.2

0

0

– Total Power Dissipation – WP

D

Output Voltage (Constant Current) – V

NOTES: A. The data is based on simulation result. When TI recommended print circuit board is used, derate linearly at the rate of 31.4mW/°C

for operation above 25°C free-air temperature. VCC=5 V , I

O(LC)

= 80 mA, ICC is typical value.

B. The thermal impedance will be varied depend on mounting conditions. Since PZP package established low thermal impedance by

radiating heat from thermal pad, the thermal pad should be soldered to pattern with low thermal impedance.

C. The material for PCB should be selected considering the thermal characteristics since the temperature will rise around the thermal

pad.

Figure 4. Power Rating

TLC5921

LED DRIVER

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

constant output current

500

I

lkg

– Input Leakage Current – (mA)

100000

1000

10 20 30 40 60 70 80

100

10000

66000

13200

6000

2750

1800

1300

860

1040

730

640

Conditions : VO = 1 V, V

ref

= 1.3 V

NOTE: The resistor, R

(IREF)

, should be located as close to IREF terminal as possible to avoid the noise influence.

R

(ref)

Ω()

– Reference Resistance –

Figure 5. Current on Constant Current Output vs External Resistor

TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

Template Release Date: 7–11–94

12

POST OFFICE BOX 655303 DALLAS, TEXAS 75265

•

SD15_A

BLANK

XLAT

SCLK

SOMODE

SOUT

OUTn

XDOWN

SIN

1/f

SCLK

SD14_A

td (SCLK–SOUT)

Figure 6. Timing Diagram

SD00_B SD01_B SD02_B SD14_B SD15_B SD00_DSD15_CSD14_CSD00_C

tsu (SIN–SCLK) th (SIN–SCLK)

tsu (XLAT–SCLK)

twl (SCLK) twh (SCLK)

td (SCLK–SOUT)

td (SCLK–SOUT)

SD15_A SD00_B SD01_B SD14_B SD15_B SD00_C

DRIVER OFFDRIVER OFF

td (BLANK–OUTn)

td (BLANK–OUTn)

DRIVER ONDRIVER ON DRIVER OFFDRIVER OFF

td (BLANK–XDOWN)

td (BLANK–XDOWN)

(Note)

NOTE : LED disconnected

SD01_A SD02_A

HI–Z

SD00_A

th (XLAT–SCLK)

TLC5921

LED DRIVER

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13

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

MECHANICAL DATA

DAP (R-PDSO-G**) PowerPAD PLASTIC SMALL-OUTLINE PACKAGE

0,25

0,75
0,50

0,15 NOM

Gage Plane

NOM

6,20

8,40
7,80

Thermal Pad
(see Note D)

38

12,60

11,10

32

Seating Plane

12,4010,90

4073257/A 07/97

20

0,19

19

A

0,30

38

1

9,80

28

A MAX

PINS **

9,60

A MIN

DIM

1,20 MAX

10,90

11,10

30

38 PINS SHOWN

0,10

0,65

M

0,13

0°–8°

0,15
0,05

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion.
D. The package thermal performance may be enhanced by bonding the thermal pad to an external thermal plane.

This pad is electrically and thermally connected to the backside of the die and possibly selected leads.

E. Falls within JEDEC MO-153

PowerPAD is a trademark of Texas Instruments Incorporated.

IMPORTANT NOTICE

T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.

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Copyright  1999, Texas Instruments Incorporated