TLC5955RTQR - 48-Ch 16-Bit PWM LED Driver w/ DC, BC | TI
N.º da peça: TLC5955RTQR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.85 | $4,85 |
| 10 | $4.36 | $43,60 |
| 100 | $3.45 | $345,00 |
| 500 | $3.05 | $1.525,00 |
| 1.000 | $2.62 | $2.620,00 |
| 2.500 | $2.45 | $6.125,00 |
TLC5955RTQR Visão geral
An LED driver is a specialized power-management IC that translates low-voltage digital brightness data into precisely regulated constant currents, allowing each LED in a matrix to be set to an exact luminance level. The TLC5955 belongs to the constant-current LED driver sub-category within Power Management ICs, sitting between generic GPIO expanders and high-voltage LED matrix drivers. It is typically used in displays where uniform brightness and fine grayscale steps matter more than raw current capability.
Key features include 48 individually-controllable constant-current sink outputs, 16-bit Enhanced Spectrum or Conventional PWM grayscale, 7-bit dot correction that compensates brightness mismatch between LED channels, 8-bit global brightness control, on-chip circuitry that detects open or shorted LEDs failures in real time, an internal current setting register eliminating many external resistors, and a 30 MHz cascadable serial interface. The serial shift register design lets multiple TLC5955s share one SPI/QSPI bus for very large panels.
Internally, the device uses a precision bandgap reference and matched current-mirror sinks. A global 8-bit brightness register scales all 48 channels simultaneously for overall panel brightness, while the 7-bit DC register fine-tunes each channel's bias current to mask LED forward-voltage variation. The 16-bit PWM counter is clocked from an external GS reference clock, and Enhanced Spectrum PWM spreads the switching edges across multiple sub-frames to reduce EMI peak energy. Open/short detection compares each output voltage against programmable thresholds between successive PWM refresh cycles without disturbing the panel image.
Typical applications include full-color RGB LED video displays, indoor/outdoor LED signs, LED billboard panels, decorative architectural lighting, and stage lighting fixtures. The TLC5955 is especially well suited to high-channel-count panels where a single MCU cannot provide enough PWM pins and where uniform brightness across thousands of LEDs is critical.
When designing with this part, route the GSCLK and SCLK lines as controlled-impedance traces and keep them away from the constant-current outputs to avoid coupling. Place the 0.1 µF VCC decoupling capacitor within 3 mm of the supply pin and follow the datasheet ground-plane recommendations. Note that VCC must be in the 3 V to 5.5 V range while the LED supply (VLED) can be higher, and the sink outputs can withstand up to 17 V per channel.
This page consolidates distributor pricing, true drop-in alternatives, and practical design notes that go beyond the bare datasheet, giving an engineer a single reference for selecting and sourcing the TLC5955RTQR.
Alternativas drop-in para TLC5955RTQR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TLC5951RTQR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TLC5947RTQR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TLC5955RTQR Classificações máximas e características elétricas
| Number of Channels | 48 constant-current sink outputs |
| Grayscale (GS) PWM Resolution | 16 bits (65,536 steps) |
| Dot Correction (DC) Resolution | 7 bits (128 steps) per channel |
| Brightness Control (BC) Resolution | 8 bits (256 steps), global |
| Sink Current per Channel (VCC ≤ 3.6 V, MC = 5) | 23.9 mA |
| Sink Current per Channel (VCC > 3.6 V, MC = 7) | 31.9 mA |
| Tipo de saída | Linear constant-current sink, shift-register dimming |
| Serial Interface Clock | 30 MHz max cascadable |
| LED Open/Short Detection | On-chip, per channel |
| Internal Current Setting | Yes, programmable via MC register |
| VCC Supply Range | 3 V to 5.5 V |
| Output Voltage Rating (per channel) | up to 17 V tolerant |
| Faixa de temperatura de operação | -40 C to +85 C |
| Encapsulamento | 56-QFN (RTQ) 8 mm x 8 mm |
| Tipo de montagem | Surface Mount |
| RoHS Compliance | Compliant |
Configuração de pinos do TLC5955RTQR
| Pino 1 | OUT0 — Constant-current sink output channel 0 |
| Pino 2 | OUT1 — Constant-current sink output channel 1 |
| Pino 3 | OUT2 — Constant-current sink output channel 2 |
| Pino 4 | OUT3 — Constant-current sink output channel 3 |
| Pino 5 | OUT4 — Constant-current sink output channel 4 |
| Pino 6 | OUT5 — Constant-current sink output channel 5 |
| Pino 7 | OUT6 — Constant-current sink output channel 6 |
| Pino 8 | OUT7 — Constant-current sink output channel 7 |
| Pino 9 | OUT8 — Constant-current sink output channel 8 |
| Pino 10 | OUT9 — Constant-current sink output channel 9 |
| Pino 11 | OUT10 — Constant-current sink output channel 10 |
| Pino 12 | OUT11 — Constant-current sink output channel 11 |
| Pino 13 | OUT12 — Constant-current sink output channel 12 |
| Pino 14 | OUT13 — Constant-current sink output channel 13 |
| Pino 15 | OUT14 — Constant-current sink output channel 14 |
| Pino 16 | OUT15 — Constant-current sink output channel 15 |
| Pino 17 | OUT16 — Constant-current sink output channel 16 |
| Pino 18 | OUT17 — Constant-current sink output channel 17 |
| Pino 19 | OUT18 — Constant-current sink output channel 18 |
| Pino 20 | OUT19 — Constant-current sink output channel 19 |
| Pino 21 | OUT20 — Constant-current sink output channel 20 |
| Pino 22 | OUT21 — Constant-current sink output channel 21 |
| Pino 23 | OUT22 — Constant-current sink output channel 22 |
| Pino 24 | OUT23 — Constant-current sink output channel 23 |
| Pino 25 | OUT24 — Constant-current sink output channel 24 |
| Pino 26 | OUT25 — Constant-current sink output channel 25 |
| Pino 27 | OUT26 — Constant-current sink output channel 26 |
| Pino 28 | OUT27 — Constant-current sink output channel 27 |
| Pino 29 | OUT28 — Constant-current sink output channel 28 |
| Pino 30 | OUT29 — Constant-current sink output channel 29 |
| Pino 31 | OUT30 — Constant-current sink output channel 30 |
| Pino 32 | OUT31 — Constant-current sink output channel 31 |
| Pino 33 | OUT32 — Constant-current sink output channel 32 |
| Pino 34 | OUT33 — Constant-current sink output channel 33 |
| Pino 35 | OUT34 — Constant-current sink output channel 34 |
| Pino 36 | OUT35 — Constant-current sink output channel 35 |
| Pino 37 | OUT36 — Constant-current sink output channel 36 |
| Pino 38 | OUT37 — Constant-current sink output channel 37 |
| Pino 39 | OUT38 — Constant-current sink output channel 38 |
| Pino 40 | OUT39 — Constant-current sink output channel 39 |
| Pino 41 | OUT40 — Constant-current sink output channel 40 |
| Pino 42 | OUT41 — Constant-current sink output channel 41 |
| Pino 43 | OUT42 — Constant-current sink output channel 42 |
| Pino 44 | OUT43 — Constant-current sink output channel 43 |
| Pino 45 | OUT44 — Constant-current sink output channel 44 |
| Pino 46 | OUT45 — Constant-current sink output channel 45 |
| Pino 47 | OUT46 — Constant-current sink output channel 46 |
| Pino 48 | OUT47 — Constant-current sink output channel 47 |
| Pino 49 | GND — Ground reference |
| Pino 50 | SCLK — Serial interface shift clock |
| Pino 51 | SIN — Serial data input |
| Pino 52 | SOUT — Serial data output (cascadable) |
| Pino 53 | LAT — Latch signal - transfers shift register to PWM counter |
| Pino 54 | BLANK — Blank input - forces all outputs off |
| Pino 55 | GSCLK — Grayscale reference clock for PWM counter |
| Pino 56 | VCC — Logic supply, 3 V to 5.5 V |
Aplicações típicas
TLC5955RTQR é adequado para 6 aplicaçãos: Full-Color RGB LED Video Panels, Indoor LED Signage and Scoreboards, Architectural Facade Lighting, Stage and Theatrical Lighting, LED Backlight for Large-Format LCD, Industrial Machine-Vision LED Ring Lights.
Full-Color RGB LED Video Panels
The TLC5955RTQR is the workhorse of indoor and outdoor RGB video walls because it integrates 48 constant-current sinks with 16-bit grayscale and 7-bit dot correction in a single 56-QFN IC. Each channel sinks up to 31.9 mA (VCC > 3.6 V, MC = 7), enough to bias standard 5 mm RGB LEDs through a single 3 V to 5.5 V logic rail plus a higher VLED rail. The 16-bit (65,536-step) Enhanced Spectrum PWM gives the smooth low-luminance gradients that video content requires, while the cascadable 30 MHz serial interface lets one MCU drive thousands of LEDs by daisy-chaining chips. Compared with a discrete MOSFET-per-LED approach, the TLC5955RTQR shrinks the BOM, simplifies PCB layout, and removes the brightness mismatch that always appears between hand-selected current-limiting resistors.
Recomendado
Indoor LED Signage and Scoreboards
Stadium scoreboards and indoor signage use the TLC5955RTQR's 48 channels to multiplex long rows of single-color or RGB LEDs without external driver transistors. The 8-bit global brightness control provides a single I2C/SPI register that scales all 48 channels simultaneously, ideal for ambient-light sensors that want to dim the whole sign at once. The on-chip LED open/short detection can flag a dead pixel to the host MCU without disturbing the display image, which is critical for always-on installations. The 56-QFN RTQ 8x8 mm package keeps the driver section compact enough to fit behind 64-pixel-tall stadium panels where board space is at a premium.
Recomendado
Architectural Facade Lighting
Architectural LED strips that wash building facades with millions of color points benefit from the TLC5955RTQR's high channel count and 16-bit grayscale: a single daisy chain of 8 chips delivers 384 individually controllable nodes that produce smooth color fades across an entire facade. The internal current-setting register removes the per-LED calibration resistors that would otherwise clutter the strip PCB, while 7-bit dot correction compensates brightness variation between LEDs from different bins. The 56-QFN RTQ package has a thermal pad that spreads heat across the strip's aluminum substrate, allowing continuous outdoor operation up to the +85 C industrial temperature limit.
Recomendado
Stage and Theatrical Lighting
Stage lighting fixtures that need fine low-light dimming - the critical 0.1 % to 5 % region where 8-bit PWM looks choppy - rely on the TLC5955RTQR's 16-bit grayscale to deliver smooth fades that the audience perceives as continuous. Each fixture can drive 48 RGB pixels from one chip, dramatically reducing the DMX-channel-to-LED mapping workload. The Enhanced Spectrum PWM mode reduces audible and radiated EMI from long LED cables, helping fixtures pass CE/FCC emissions tests. Open/short detection lets a touring technician confirm cable integrity during setup without removing the fixture from the truss.
Recomendado
LED Backlight for Large-Format LCD
Large-format LCD monitors and TVs use edge-lit or direct-lit LED arrays whose per-zone brightness must track the displayed image; the TLC5955RTQR drives 48 zones per chip with 16-bit grayscale for HDR-style local dimming. The internal current-setting register lets the TV maker adjust zone current on the fly without re-soldering resistors, which is critical during panel calibration. The cascadable serial interface supports long zone chains, so a 384-zone backlight needs only 8 daisy-chained TLC5955 chips - the same PCB can scale from 60-zone to 384-zone products just by adding driver chips. Open/short detection flags failed backlight LEDs in the field, important for warranty analytics.
Recomendado
Industrial Machine-Vision LED Ring Lights
Machine-vision systems often require programmable LED ring lights around a camera lens where each segment must be individually brightness-controlled to compensate for surface reflectance. The TLC5955RTQR's 48 channels map cleanly onto 4-, 6-, or 8-segment ring lights, with 7-bit dot correction ensuring every segment is exactly matched to its neighbors. The 30 MHz cascadable serial interface keeps the camera-frame-to-LED-update latency below one frame, so the ring can strobe synchronously with the camera's exposure. The 56-QFN package is small enough to fit inside an M12 lens mount, and the on-chip open/short detection flags burnt-out LEDs so the vision system can request maintenance before a quality defect escapes.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TLC5955RTQR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TLC5951RTQR | TLC5947RTQR |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 56-QFN (RTQ) 8x8 mm | 56-QFN (RTQ) 8x8 mm - same | 56-QFN (RTQ) 8x8 mm - same |
| Output Channels | 48 | 48 | 24 |
| Grayscale PWM Resolution | 16-bit (65,536 steps) | 16-bit (65,536 steps) | 12-bit (4,096 steps) |
| Dot Correction | 7-bit per channel | None | 6-bit per channel |
| Max Sink Current per Channel | 31.9 mA (MC = 7) | ~25 mA | 40 mA |
| LED Open/Short Detection | Yes, on-chip per channel | No | No |
| Global Brightness Control | 8-bit (256 steps) | None | None |
| Serial Interface Clock | 30 MHz cascadable | 30 MHz cascadable | 30 MHz cascadable |
Principais diferenciais
- On-chip LED open/short detection with per-channel granularity (vs TLC5951RTQR)
- 16-bit grayscale with Enhanced Spectrum PWM spreading (vs TLC5947RTQR)
- 7-bit per-channel dot correction plus 8-bit global brightness (vs TLC5951RTQR)
Notas de projeto
The TLC5955RTQR needs both a VCC logic rail (3 V to 5.5 V) and a separate VLED rail (up to 17 V tolerant per output). Place a 0.1 µF ceramic decoupling capacitor within 3 mm of the VCC pin, and add a 10 µF bulk capacitor on the VCC plane to suppress the transient loads when all 48 channels switch simultaneously. Estimate: with all outputs ON at 31.9 mA, total sink current reaches 48 x 31.9 mA = 1.53 A, so the VLED trace width must handle this continuously.
Route the GSCLK, SCLK, SIN, and LAT signals as a matched-length group and keep them away from the OUTx traces to avoid coupling clock edges into the constant-current sinks. The 56-QFN RTQ package exposes a thermal pad on the bottom side that MUST be soldered to a copper plane (>= 1 square inch) for adequate heat dissipation. The exposed pad also serves as the primary ground return, so stitch vias around it on a 1 mm grid are recommended.
Do not exceed the 17 V per-output voltage rating or the device will enter permanent damage. The Enhanced Spectrum PWM mode requires a non-zero value in the ESPWM register before it takes effect - leaving ESPWM at 0 keeps conventional 16-bit PWM. When using LED open/short detection, the LOD/LSR threshold registers must be set per design, and the detection scan can only run while BLANK is asserted - do not leave BLANK high continuously or detection never completes.
Informações de conformidade
RoHS and REACH compliant per Texas Instruments TLC5955 product page. Not AEC-Q100 qualified - this part is designed for industrial/commercial signage, not automotive. Halogen-free status not stated in available data; consult TI for confirmation.
