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  • TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

    • SBVS241 April   2014 TLC5954

      PRODUCTION DATA.  

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  • TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Pin Equivalent Input and Output Schematic Diagrams
    2. 7.2 Test Circuits
    3. 7.3 Timing Diagrams
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Output Current Calculation
      2. 8.3.2 Status Information Data (SID)
      3. 8.3.3 LED Open Detection (LOD)
      4. 8.3.4 LED Short Detection (LSD)
      5. 8.3.5 Noise Reduction
    4. 8.4 Device Functional Modes
      1. 8.4.1 Maximum Constant Sink Current
      2. 8.4.2 Global Brightness Control (BC) Function: Sink Current Control
      3. 8.4.3 Constant-Current Output On or Off Control
      4. 8.4.4 Power-Save Mode
    5. 8.5 Register Maps
      1. 8.5.1 Register and Data Latch Configuration
        1. 8.5.1.1 Common Shift Register
        2. 8.5.1.2 Output On or Off Data Latch
        3. 8.5.1.3 Maximum Current Control (MC), Global Brightness Control (BC), and Function Control (FC) Data Latch
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Step-by-Step Design Procedure
        2. 9.2.2.2 Maximum Current (MC) Data
        3. 9.2.2.3 Global Brightness Control (BC) Data
        4. 9.2.2.4 On or Off Data
        5. 9.2.2.5 Other Control Data
        6. 9.2.2.6 Grayscale Control
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RTQ|56
    • MPQF168D
Thermal pad, mechanical data (Package|Pins)
  • RTQ|56
    • QFND498B
Orderable Information
  • sbvs241_oa
  • sbvs241_pm
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DATA SHEET

TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

1 Features

  • 48 Constant-Current Sink Output Channels with On or Off Control
  • Current Capability:
    • 34.9 mA for 32 Channels
    • 24.4 mA 16 Channels
  • No External Resistor for Current Setting
  • Maximum Current Control (MC): 3 Bits (8 Steps)
  • Global Brightness Control (BC) for Each Color Group: 7 Bits (128 Steps), Three Groups
  • LED Power-Supply Voltage: Up to 10 V
  • VCC = 3.0 V to 3.6 V
  • Constant-Current Accuracy:
    • Channel-to-Channel = ±1% (typ), ±3% (max)
    • Device-to-Device = ±2% (typ), ±4% (max)
  • Data Transfer Rate: 30 MHz
  • BLANK Pulse Duration: 40 ns (min)
  • LED Open Detection (LOD)
  • LED Short Detection (LSD)
  • Power-Save Mode (PSM): 7-µA Consumption, High-Speed Recovery
  • Undervoltage Lockout Sets Default Data
  • Delayed Switching Minimizes Inrush Current
  • Operating Temperature: –40°C to +85°C

2 Applications

  • LED Video Displays
  • Variable Message Signs (VMS)
  • Illumination

3 Description

The TLC5954 is a 48-channel, constant-current sink LED driver. Each channel can be turned on or off by writing data to an internal register. The output channels (OUTXn) are grouped into three groups of 16 channels. Each channel group (R, G, and B) has a 128-step global brightness control (BC) function. The maximum current value of all 48 channels can be set with an 8-step maximum current control (MC) function. The device has two error flags: LED open detection (LOD) and LED short detection (LSD). The error flags can be read via a serial interface port. The device also has a power-save mode that sets the total current consumption to 7 µA (typ) when all outputs are off.

Device Information(1)

DEVICE NAME PACKAGE BODY SIZE
TLC5954 VQFN (56) 8 mm × 8 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Application Circuit

alt_sbvs241.gif

4 Revision History

Date Revision Notes
April 2014 * Initial release.

5 Pin Configuration and Functions

RTQ Package
VQFN-56
(Top View)
po_rtq_bvs241.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
GND 1, 56 — Ground. All GND pins are connected internally.
OUTR0 to OUTR15 2, 5, 8, 11, 14, 17, 20, 23, 30, 33, 36, 39, 44, 47, 50, 53 O Red LED constant-current outputs (OUTRn).
Multiple outputs can be tied together to increase the constant-current capability. Different voltages can be applied to each output. These outputs are turned on or off by the BLANK signal and the data in the output on or off control data latch.
OUTG0 to OUTG15 3, 6, 9, 12, 15, 18, 21, 24, 31, 34, 37, 40, 45, 48, 51, 54 O Green LED constant-current outputs (OUTGn).
Multiple outputs can be tied together to increase the constant-current capability. Different voltages can be applied to each output. These outputs are turned on or off by the BLANK signal and the data in the output on or off control data latch.
OUTB0 to OUTB15 4, 7, 10, 13, 16, 19, 22, 25, 32, 35, 38, 41, 46, 49, 52, 55 O Blue LED constant-current outputs (OUTBn).
Multiple outputs can be tied together to increase the constant-current capability. Different voltages can be applied to each output. These outputs are turned on or off by the BLANK signal and the data in the output on or off control data latch.
SIN 26 I Serial data input of the 49-bit common shift register, Schmitt buffer input.
When SIN is high, the LSB is set to 1 for only one SCLK input rising edge. If two SCLK rising edges are input while SIN is high, then the 49-bit shift register LSB and LSB+1 are set to 1. When SIN is low, the LSB is set to 0 at the SCLK input rising edge.
LAT 27 I Edge-triggered latch, Schmitt buffer input.
The LAT rising edge latches data from the common shift register either into the output on or off data latch or the maximum current control (MC), brightness control (BC), or function control (FC) data latch. When the common shift register data are latched into the on or off data latch, data in the common shift register are simultaneously replaced with SID, which is selected by SIDLD. Refer to the Output On or Off Data Latch and Status Information Data (SID) sections for more details.
SCLK 28 I Serial data shift clock, Schmitt buffer input.
Data present on SIN are shifted to the 49-bit common shift register LSB with the SCLK rising edge. Data in the shift register are shifted towards the MSB at each SCLK rising edge. The common shift register MSB appears on SOUT.
BLANK 29 I Blank all outputs, Schmitt buffer input.
When BLANK is high, all constant-current outputs (OUTXn) are forced off. When BLANK is low, all OUTXn are controlled by the on or off control data in the data latch.
SOUT 42 O Serial data output of the 49-bit common shift register.
SOUT is connected to the MSB of the register. Data are clocked out at the SCLK rising edge.
VCC 43 — Power-supply voltage
Thermal pad — Ground. The thermal pad must be connected to GND on the printed circuit board (PCB).

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VCC Supply voltage(2) –0.3 4.0 V
VIN Input voltage range SIN, SCLK, LAT, BLANK –0.3 VCC + 0.3 V
VOUT Output voltage range SOUT –0.3 VCC + 0.3 V
OUTR0 to OUTR15, OUTG0 to OUTG15,
OUTB0 to OUTB15		 –0.3 11 V
TJ (max) Operating junction temperature 150 °C
(1) 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 my affect device reliability.
(2) All voltages are with respect to device ground pin.

6.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range –55 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) –200 2000 V
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) –500 500 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

At TA= –40°C to +85°C, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
DC CHARACTERISTICS (VCC = 3 V to 3.6 V)
VCC Supply voltage 3.0 3.6 V
VO Voltage applied to output OUTR0 to OUTR15, OUTG0 to OUTG15, OUTB0 to OUTB15 10 V
VIH High-level input voltage SIN, SCLK, LAT, BLANK 0.7 × VCC VCC V
VIL Low-level input voltage SIN, SCLK, LAT, BLANK GND 0.3 × VCC V
IOH High-level output current SOUT –2 mA
IOL Low-level output current SOUT 2 mA
TA Operating free-air temperature range –40 +85 °C
TJ Operating junction temperature range –40 +125 °C
AC CHARACTERISTICS (VCC = 3 V to 3.6 V)
fCLK (SCLK) Data shift clock frequency SCLK 30 MHz
tWH0 Pulse duration SCLK 10 ns
tWL0 SCLK 10 ns
tWH1 LAT 15 ns
tWH2 BLANK 60 ns
tWL2 BLANK 40 ns
tSU0 Setup time SIN to SCLK↑ 4 ns
tSU1 LAT↓ to SCLK↑ 20 ns
tSU2 SCLK↑ resumes normal mode, BLANK↓, PSMODE bit = 01b 12 µs
tSU3 LAT↑ for all data latching except all 0s resumes normal mode, BLANK↓, PSMODE bit = 10b 12 µs
tH0 Hold time SCLK↑ to SIN 3 ns
tH1 SCLK↑ to LAT↑ 10 ns

6.4 Thermal Information

THERMAL METRIC(1) TLC5954 UNIT
RTQ (VQFN)
56 PINS
RθJA Junction-to-ambient thermal resistance 29.1 °C/W
RθJCtop Junction-to-case (top) thermal resistance 16.3
RθJB Junction-to-board thermal resistance 7.7
ψJT Junction-to-top characterization parameter 0.3
ψJB Junction-to-board characterization parameter 7.7
RθJCbot Junction-to-case (bottom) thermal resistance 2.8
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

At TA = –40°C to +85°C and VCC = 3.0 V to 3.6 V, unless otherwise noted. Typical values are at TA = +25°C and VCC = 3.3 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOH High-level output voltage IOH = –2 mA at SOUT VCC – 0.4 VCC V
VOL Low-level output voltage IOL = 2 mA at SOUT 0.4 V
VLOD0 LED open-detection threshold LODVLT = 000b 0.15 0.20 0.25 V
VLOD1 LODVLT = 001b, 101b, 110b, 111b 0.25 0.30 0.35 V
VLOD2 LODVLT = 010b 0.35 0.40 0.45 V
VLOD3 LODVLT = 011b 0.45 0.50 0.55 V
VLOD4 LODVLT = 100b 0.55 0.60 0.65 V
VLSD0 LED short-detection threshold LSDVLT = 00b 0.45 × VCC 0.50 × VCC 0.55 × VCC V
VLSD1 LSDVLT = 01b 0.65 × VCC 0.70 × VCC 0.75 × VCC V
VLSD2 LSDVLT = 10b, 11b 0.85 × VCC 0.90 × VCC 0.95 × VCC V
IIN Input current VIN = VCC or GND at SIN, SCLK, LAT, and BLANK –1 1 μA
ICC0 Supply current (VCC) SIN, SCLK, LAT = GND, BLANK = VCC, VOUTXn = 1 V, BCX = 7Fh, MC = 0h (IOUTRn, IOUTGn = 2.9-mA target, IOUTBn = 2.0-mA target)(5) 15 19 mA
ICC1 SIN, SCLK, LAT = GND, BLANK = VCC, VOUTXn = 1 V, BCX = 7Fh, MC = 5h (IOUTRn, IOUTGn = 17.4-mA target, IOUTBn = 12.2-mA target) 17.5 22 mA
ICC2 SIN, SCLK, LAT, BLANK = GND, all OUTXn = on, VOUTXn = 1 V, BCX = 7Fh, MC = 5h 17.5 22 mA
ICC3 SIN, SCLK, LAT, BLANK = GND, all OUTXn = on, VOUTXn = 1 V, BCX = 7Fh, MC = 7h (IOUTRn, IOUTGn = 34.9-mA target, IOUTBn = 24.4-mA target) 20.5 25.5 mA
ICC4 In power-save mode, SIN, SCLK, LAT = GND,
BLANK = VCC		 7 60 µA
IOLC0 Constant output current All OUTXn = on, VOUTXn = VOUTfix = 1 V, BC = 7Fh,
MC = 7h, at OUTR0 to OUTR15 and OUTG0 to OUTG15		 32.5 34.9 37.3 mA
IOLC1 All OUTXn = on, VOUTXn = VOUTfix = 1 V, BC = 7Fh,
MC = 7h, at OUTB0 to OUTB15		 22.7 24.4 26.1 mA
IOLKG Output leakage current BLANK = VCC, VOUTXn = VOUTfix = 10 V, MC = 7h, at OUTXn TJ = +25°C 0.1 µA
TJ = +85°C 0.2 µA
TJ = +125°C 0.5 µA
ΔIOLC0 Constant-current error
(channel-to-channel)(1)		 All OUTXn = on, BCX = 7Fh, VOUTXn = VOUTfix = 1 V, MC = 7h, at same color group (OUTXn) ±1% ±3%
ΔIOLC1 Constant-current error
(device-to-device)(2)		 All OUTXn = on, BCX = 7Fh, VOUTXn = VOUTfix = 1 V, MC = 7h, at same color group (OUTXn) ±0.5% ±3%
ΔIOLC2 Line regulation(3) All OUTXn = on, BCX = 7Fh, VOUTXn = VOUTfix = 1 V, MC = 7h, at OUTXn ±0.5 ±1 %/V
ΔIOLC3 Load regulation(4) All OUTXn = on, BCX = 7Fh, VOUTXn = 1 V to 3 V, VOUTfix = 1 V, MC = 7h, at OUTXn ±1 ±3 %/V
(1) The deviation of each output in the same color group (OUTRn, OUTGn, OUTBn) from the average of the same OUTXn group constant-current. Deviation is calculated by the formula:
q_delta01_bvs241.gif
, where X = R, G, or B, and n = 0 to 15.
(2) The deviation of the OUTXn constant-current average from the ideal constant-current value. Deviation is calculated by the formula:
q_delta02_bvs241.gif
Ideal current is 34.9 mA for OUTRn and OUTGn. Ideal current is 24.4 mA for OUTBn with MC data equal to 7h.
, where X = R, G, or B, and n = 0 to 15.
(3) Line regulation is calculated by the formula:
q_line_bvs241.gif
X = R, G, or B. n = 0 to 15.
(4) Load regulation is calculated by the equation:
q_load_bvs241.gif
, where X = R, G, or B, and n = 0 to 15.
(5) X = R, G, and B. n = 0 to 15.

6.6 Switching Characteristics

At TA = –40°C to +85°C, VCC = 3.0 V to 3.6 V, CL = 15 pF, RL = 100 Ω for OUTRn and OUTGn, RL = 150 Ω for OUTBn,
MC = 7h, and VLED = 4.5 V, unless otherwise noted. Typical values at TA = +25°C and VCC = 3.3 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tR0 Rise time SOUT 2 5 ns
tR1 OUTXn, BCX = 7Fh(3) 20 50 ns
tF0 Fall time SOUT 2 5 ns
tF1 OUTXn, BCX = 7Fh 20 50 ns
tD0 Propagation delay(1) SCLK↑ to SOUT 13 23 ns
tD1 LAT↑ to OUTR0 on to off or OUTR0 off to on, BCX = 7Fh 30 60 ns
tD2 BLANK↓↑ to OUTR0 on to off or OUTR0 off to on, BCX = 7Fh 30 60 ns
tD3 OUTRn on to OUTGn on, OUTGn on to OUTBn on, and OUTBn on to the next OUTRn on, BCX = 7Fh 1.5 5 ns
tD4 OUTRn off to OUTGn off, OUTGn off to OUTBn off, and OUTBn off to the next OUTRn off, BCX = 7Fh 1.5 5 ns
tD5 LAT↑ to power-save mode by writing data for all OUTXn off 150 300 ns
tON_ERR Output on-time error(2) OUTXn on or off data = all 1s, BCX = 7Fh, 40-ns BLANK low-level one-shot pulse input –35 35 ns
(1) tD3 (OUTRn on to OUTGn on, OUTGn on to OUTBn on, and OUTBn on to the next OUTRn on) and tD4 (OUTRn off to OUTGn off, OUTGn off to OUTBn off, and OUTBn off to the next OUTRn off) are calculated by:
tD3 (ns) = (the propagation delay between OUTR0 on to OUTB7 on) / 47 and
tD4 (ns) = (the propagation delay between OUTR0 off to OUTB7 off) / 47.
(2) Output on-time error (tON_ERR) is calculated by the formula: tON_ERR (ns) = tOUT_ON – BLANK low-level pulse duration.
tOUT_ON is the actual on-time of OUTXn.
(3) X = R, G, or B. n = 0 to 15.

6.7 Typical Characteristics

At TA = +25°C and VCC = 3.3 V, unless otherwise noted.
D001_SBVS241.gif
BCR, BCG = 7Fh
Figure 1. Output Current vs Output Voltage
(OUTRn, OUTGn)
D003_SBVS241.gif
BCR = BCG = 7Fh MC = 7
Figure 3. Output Current vs Output Voltage
(OUTRn, OUTGn)
D005_SBVS241.gif
BCR = 7Fh MC = 7
Figure 5. Constant-Current Error vs Output Current (Channel-to-Channel, OUTRn)
D007_SBVS241.gif
BCB = 7Fh MC = 7
Figure 7. Constant-Current Error vs Output Current (Channel-to-Channel, OUTBn)
D009_SBVS241.gif
BCG = 7Fh MC = 7h
Figure 9. Constant-Current Error vs Ambient Temperature (Channel-to-Channel, OUTGn)
D011_SBVS241.gif
BCR = BCG = 7Fh
Figure 11. Global Brightness Control Linearity
(OUTRn, OUTGn)
D013_SBVS241.gif
SIN = 15 MHz SCLK = 30 MHz BCX = 7Fh
MC = 0h to 7h All OUTXn = On BLANK = Low
SOUT = No Load VOUT = 0.8 V
Figure 13. Supply Current vs Output Current
figure15_sbvs241.gif
VCC = 3.3 V MC = 7h BCX = 7Fh VLED = 4.5 V
RL = 100 Ω (OUTRn, OUTGn) RL = 150 Ω (OUTBn)
CL = 15 pF BLANK Low Pulse Duration = 40 ns
Figure 15. Constant-Current Output Voltage Waveform
D002_SBVS241.gif
BCB = 7Fh
Figure 2. Output Current vs Output Voltage
(OUTBn)
D004_SBVS241.gif
BCB = 7Fh MC = 7
Figure 4. Output Current vs Output Voltage
(OUTBn)
D006_SBVS241.gif
BCG = 7Fh MC = 7
Figure 6. Constant-Current Error vs Output Current (Channel-to-Channel, OUTGn)
D008_SBVS241.gif
BCR = 7Fh MC = 7h
Figure 8. Constant-Current Error vs Ambient Temperature (Channel-to-Channel, OUTRn)
D010_SBVS241.gif
BCB = 7Fh MC = 7
Figure 10. Constant-Current Error vs Ambient Temperature (Channel-to-Channel, OUTBn)
D012_SBVS241.gif
BCB = 7Fh
Figure 12. Global Brightness Control Linearity
(OUTBn)
D014_SBVS241.gif
SIN = 15 MHz BCX = 7Fh MC = 5h
All OUTXn = On SCLK = 30 MHz BLANK = Low
SOUT = No Load VOUT = 0.8 V
TA = –40°C to +85°C
Figure 14. Supply Current vs Ambient Temperature

 
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