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  • TLC5958 48-Channel, 16-Bit ES-PWM LED Driver with Pre-Charge FET, LED Open Detection and Display Data Memory Support 32-Multiplexing

    • SLVSCE7A May   2014  – September 2014 TLC5958

      PRODUCTION DATA.  

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  • TLC5958 48-Channel, 16-Bit ES-PWM LED Driver with Pre-Charge FET, LED Open Detection and Display Data Memory Support 32-Multiplexing
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Typical Application Circuit (Multiple Daisy-Chained TLC5958s)
  5. 5 Revision History
  6. 6 Description (Continued)
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 Handling Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. 9 Parameter Measurement Information
    1. 9.1 Pin Equivalent Input and Output Schematic Diagrams
      1. 9.1.1 Test Circuits
    2. 9.2 Timing Diagrams
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Device Functional Modes
      1. 10.3.1  Brightness Control (BC) Function
      2. 10.3.2  Color Brightness Control (CC) Function
      3. 10.3.3  Select RIREF For a Given BC
      4. 10.3.4  Choosing BC/CC For a Different Application
        1. 10.3.4.1 Example 1: Red LED Current is 20mA, Green LED Needs 12mA, Blue LED needs 8mA
        2. 10.3.4.2 Example 2: Red LED Current is 5mA, Green LED Needs 2mA, Blue LED Needs 1mA.
      5. 10.3.5  LED Open Detection (LOD)
      6. 10.3.6  Power Save Mode (PSM)
      7. 10.3.7  Internal Pre-Charge FET
      8. 10.3.8  Thermal Shutdown (TSD)
      9. 10.3.9  IREF Resistor Short Protection (ISP)
      10. 10.3.10 Noise Reduction
  11. 11Application and Implementation
  12. 12Power Supply Recommendations
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14Device and Documentation Support
    1. 14.1 Trademarks
    2. 14.2 Electrostatic Discharge Caution
    3. 14.3 Glossary
  15. 15Mechanical, Packaging, and Orderable Information
  16. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RTQ|56
    • MPQF168D
Thermal pad, mechanical data (Package|Pins)
  • RTQ|56
    • QFND498B
Orderable Information
  • slvsce7a_oa
  • slvsce7a_pm
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DATA SHEET

TLC5958 48-Channel, 16-Bit ES-PWM LED Driver with Pre-Charge FET, LED Open Detection and Display Data Memory Support 32-Multiplexing

1 Features

  • 48 Channels Constant Current Sink Output
  • Sink Current Capability with Max BC/CC data:
    • 25mA at 5VCC
    • 20mA at 3.3VCC
  • Global Brightness Control (BC) : 3-Bit (8 Step)
  • Color Brightness Control (CC) for Each Color Group:
    9-Bit (512 Step), Three Groups
  • Grayscale(GS) Control with Multiplexed Enhanced Spectrum(ES) PWM: 16bit
  • 48K bit Grayscale Data Memory Support 32-multiplexing
  • LED Power Supply Voltage Up To 10V
  • Vcc = 3.0V to 5.5V
  • Constant Current Accuracy
    • Channel to Channel = ±1%(Typ), ±3%(Max)
    • Device to Device = ±1%(Typ), ±2%(Max)
  • Data Transfer Rate: 25MHz
  • Gray Scale Clock: 33MHz
  • LED Open Detection (LOD)
  • Thermal Shut Down (TSD)
  • IREF Resistor Short Protection (ISP)
  • Power-Save Mode (PSM) with high speed recovery
  • Delay Switching to Prevent Inrush Current
  • Pre-charge FET to Avoid Ghosting Phenomenon
  • Operating Temperature : –40°C to +85°C

2 Applications

  • LED Video Displays with Multiplexing System
  • LED Signboards with Multiplexing system
  • High Refresh Rate & High density LED Panel

3 Description

The TLC5958 is a 48 channels constant-current sink driver for multiplexing system with 1 to 32 duty ratio. Each channel has an individually-adjustable, 65536-step, pulse width modulation (PWM) grayscale (GS).

48K bit display memory is implemented to increase the visual refresh rate and to decrease the GS data writing frequency.

The output channels are grouped into three groups, each group has 16 channels. Each group has a 512-step color brightness control (CC) function. The maximum current value of all 48 channels can be set by 8-step global brightness control (BC) function. CC and BC can be used to adjust the brightness deviation between LED drivers. GS, CC, and BC data are accessible via a serial interface port.

Send request via email for Application Note: Build High Density, High Refresh Rate, Multiplexing LED Panel with TLC5958.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TLC5958 VQFN (56) 8.00 mm × 8.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Typical Application Circuit (Multiple Daisy-Chained TLC5958s)

typapp_slvsce7.gif

5 Revision History

Changes from * Revision (May 2014) to A Revision

  • Deleted Product Preview banner - set to Production Data; global change Go

6 Description (Continued)

The TLC5958 has one error flag: LED open detection (LOD), which can be read via a serial interface port. The TLC5958 also has a power-save mode that sets the total current consumption to 0.8mA (typ) when all outputs are off.

7 Pin Configuration and Functions

56 Pin
po_slvsce7.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
GCLK 29 I Grayscale(GS) pulse width modulation (PWM) reference clock control for OUTXn.
Each GCLK rising edge increase the GS counter by1 for PWM control.
GND ThermalPad – Power ground. The thermal pad must be soldered to GND on PCB.
IREF 1 – Maximum constant-current value setting. The OUTR0 to OUTB15 maximum constant output current are set to the desired values by connecting an external resistor between IREF and IREFGND. See equation 1 for more detail. The external resistor should be placed close to the device.
IREFGND 56 – Analog ground. Dedicated ground pin for the external IREF resistor. This pin should be connected to analog ground trace which is connected to power ground near the common GND point of board.
LAT 27 I The LAT falling edge latches the data from the common shift register into the GS data memory or Function control(FC) register FC1 or FC2.
OUTR0-R15 8, 11, 14, 17, 20, 23, 30, 33, 36, 39, 44, 47, 50, 53 ,2, 5 O Constant current output for RED LED. 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-off by GCLK signal and the data in GS data memory.
OUTG0-G15 9, 12, 15, 18, 21, 24, 31, 34, 37, 40, 45, 48, 51, 54, 3, 6 O Constant current output for GREEN LED. 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-off by GCLK signal and the data in GS data memory.
OUTB0-B15 10, 13, 16, 19, 22, 25, 32, 35, 38, 41, 46, 49, 52, 55, 4, 7 O Constant current output for BLUE LED. 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-off by GCLK signal and the data in GS data memory.
SCLK 28 I Serial data shift clock. Data present on SIN are shifted to the 48-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.
SIN 26 I Serial data input of the 48-bit common shift register. When SIN is high level, 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 48-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.
SOUT 42 O Serial data output of the 48-bit common shift register. SOUT is connected to the MSB of the register.
VCC 43 – Power-supply voltage.

 
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