TLC5947DAPR - 24-Ch 12-Bit PWM LED Driver | Texas Instruments
N.º de pieza: TLC5947DAPR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.91 | $2,91 |
| 10 | $2.55 | $25,50 |
| 100 | $1.83 | $183,00 |
| 500 | $1.49 | $745,00 |
| 1.000 | $1.24 | $1.240,00 |
TLC5947DAPR Descripción general
What is a constant-current LED driver? A constant-current LED driver is a specialized power management IC that regulates the current flowing through each LED string to a precise setpoint, regardless of variations in forward voltage, temperature, or supply voltage. Compared to a simple current-limiting resistor, it improves brightness uniformity, extends LED lifetime, and enables per-channel grayscale dimming. Constant-current sinks sit hierarchically inside LED drivers, which themselves are a sub-category of power management ICs alongside voltage regulators and battery management devices. The TLC5947DAPR further extends this role by adding 12-bit PWM grayscale control, dimming that circuit apart from any discrete MOSFET dimmer or boost-converter driver.
Key differentiating features include 30 mA per-channel constant-current sinking, 12-bit (4096-step) PWM grayscale resolution, an internal oscillator that removes the need for an external PWM clock, a serial shift-register interface for cascaded multi-device chains, and integrated thermal shutdown. The wide VCC supply range supports battery and bus-powered designs, while 24 channels per IC minimize driver count in large LED matrices and signage.
Architecturally, the TLC5947DAPR uses a serial-in/parallel-out shift register feeding 24 internal PWM counters that are clocked by the internal oscillator. Gray scale (GS) data is latched into the device via the serial interface and automatically replayed each PWM cycle, freeing the host microcontroller from continuous refresh. A single external IREF resistor sets the global current for all 24 channels, simplifying BOM while preserving per-pixel dimming accuracy.
Typical applications include full-color LED video displays, RGB signage, architectural lighting, decorative and stage lighting, and large LED matrix backlighting. The cascading serial interface also makes it well suited to daisy-chained WS2812x-style "NeoPixel" replacement designs where deterministic, hardware-refreshed grayscale is required without MCU overhead.
When designing with this device, place the IREF resistor close to the IREF pin to minimize noise pickup, and ensure the PowerPAD is soldered to a sufficient copper area (typically 1 square inch) to keep junction temperature within the 150 C thermal-shutdown limit under full 24-channel load.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
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Solicitar alternativasTLC5947DAPR Valores máximos y características eléctricas
| Product Type | LED Driver IC |
| Topología | Constant-Current Sink |
| Número de salidas | 24 |
| Output Current per Channel | 30 mA |
| PWM Resolution | 12-bit (4096 steps) |
| PWM Clock | Internal oscillator |
| Dimming Method | Linear Shift Register / PWM |
| Interfaz | Serial (SPI-compatible) |
| External Current-Set Resistor | Required (IREF pin) |
| Encapsulado | 32-HTSSOP (DAP) with exposed PowerPAD |
| Rango de temperatura de funcionamiento | -40 C to +85 C |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Apagado térmico | Yes |
| Cascadable | Yes (serial daisy-chain) |
| Lead-Free | Yes |
Configuración de pines de TLC5947DAPR
| Pin 1 | GND — Ground |
| Pin 2 | BLANK — Blank all outputs (active low) |
| Pin 3 | SIN — Serial data input |
| Pin 4 | SCLK — Serial clock input |
| Pin 5 | LATCH — Latch serial data into grayscale registers |
| Pin 6 | IREF — External resistor sets global LED current |
| Pin 7 | VCC — Logic supply voltage |
| Pin 8 | SOUT — Serial data output (for daisy-chain) |
| Pin 9 | OUT0 — Current sink output 0 |
| Pin 10 | OUT1 — Current sink output 1 |
| Pin 11 | OUT2 — Current sink output 2 |
| Pin 12 | OUT3 — Current sink output 3 |
| Pin 13 | OUT4 — Current sink output 4 |
| Pin 14 | OUT5 — Current sink output 5 |
| Pin 15 | OUT6 — Current sink output 6 |
| Pin 16 | OUT7 — Current sink output 7 |
| Pin 17 | OUT8 — Current sink output 8 |
| Pin 18 | OUT9 — Current sink output 9 |
| Pin 19 | OUT10 — Current sink output 10 |
| Pin 20 | OUT11 — Current sink output 11 |
| Pin 21 | OUT12 — Current sink output 12 |
| Pin 22 | OUT13 — Current sink output 13 |
| Pin 23 | OUT14 — Current sink output 14 |
| Pin 24 | OUT15 — Current sink output 15 |
| Pin 25 | OUT16 — Current sink output 16 |
| Pin 26 | OUT17 — Current sink output 17 |
| Pin 27 | OUT18 — Current sink output 18 |
| Pin 28 | OUT19 — Current sink output 19 |
| Pin 29 | OUT20 — Current sink output 20 |
| Pin 30 | OUT21 — Current sink output 21 |
| Pin 31 | OUT22 — Current sink output 22 |
| Pin 32 | OUT23 — Current sink output 23 |
Aplicaciones típicas
TLC5947DAPR es adecuado para 7 aplicacións: Full-Color LED Video Displays, RGB LED Signage and Channel Letters, Architectural and Facade Lighting, Stage and Theatrical Lighting, LED Matrix Backlighting for Industrial HMIs, Replacement for WS2812x / NeoPixel Designs, Decorative and Ambient LED Strips.
Full-Color LED Video Displays
The TLC5947DAPR is a strong fit for full-color LED video display panels because each of its 24 channels can sink up to 30 mA with 4096 PWM grayscale steps, and the internal oscillator removes the need for an external PWM clock source. In a typical 16x16 RGB panel, three TLC5947DAPR ICs drive 48 pixels per row, while the hardware-refreshed PWM keeps flicker-free refresh rates above 400 Hz even when the host MCU is busy with video processing. The serial daisy-chain interface also lets designers scale to hundreds of pixels per scan line without exhausting MCU GPIO. Use 1% tolerance IREF resistors and at least 1 square inch of PowerPAD copper to keep Tj below the 150 C thermal shutdown under full 24-channel x 30 mA load.
Recomendado
RGB LED Signage and Channel Letters
Channel-letter and architectural RGB signage benefit from the TLC5947DAPR's 24-channel count and constant-current sinking because one IC can drive 8 RGB pixels (24 individual LED anodes) with perfectly matched brightness. The 12-bit grayscale gives smooth color fades and dimming without MCU PWM compute overhead, while the wide -40 C to +85 C operating range covers outdoor installations. Designers typically daisy-chain 4-8 TLC5947DAPRs on a single SPI bus, giving 96-192 channels from one MCU peripheral. The 30 mA per-channel rating suits most 5 mm through-hole and 5050 SMD LEDs in signage; for higher-current LEDs, add an external MOSFET driver stage.
Recomendado
Architectural and Facade Lighting
Architectural lighting installations require smooth 12-bit dimming across hundreds of channels, deterministic refresh free of MCU jitter, and reliable constant-current behavior across long LED string lengths. The TLC5947DAPR delivers all three: its hardware-refreshed PWM runs independently of the host, the serial daisy-chain scales to thousands of channels per installation, and the constant-current sink compensates for forward-voltage variation across long LED string runs. The 32-HTSSOP PowerPAD package supports the thermal load of 24 x 30 mA = 720 mA continuous with proper copper area, suitable for indoor and sheltered outdoor fixtures. For larger facades, combine multiple TLC5947DAPR devices in parallel chains driven by a single STM32 host.
Recomendado
Stage and Theatrical Lighting
Stage lighting fixtures need smooth, flicker-free dimming down to very low duty cycles (sub-1% brightness), which is exactly what the TLC5947DAPR's 12-bit (4096-step) PWM grayscale enables. The internal oscillator and hardware PWM refresh mean zero MCU-induced flicker even when the lighting console updates color values rapidly over DMX or Art-Net. With 24 channels per IC, a moving-head fixture can drive 8 RGBW pixels or 24 individual dimmer channels from a single TLC5947DAPR, reducing PCB area versus discrete MOSFET dimmers. The wide supply range and -40 C to +85 C operating temperature also suit the thermal environment inside sealed luminaire enclosures.
Recomendado
LED Matrix Backlighting for Industrial HMIs
Industrial human-machine interface (HMI) panels often use large RGB LED matrices for status indication, alarms, and color-coded process visualization. The TLC5947DAPR drives these matrices with hardware-refreshed 12-bit PWM, ensuring smooth color transitions and zero CPU overhead for the LED refresh loop. The 32-HTSSOP footprint fits behind the LCD or in the panel bezel, while the serial interface connects to the main HMI processor over a 4-wire SPI bus. The -40 C to +85 C industrial temperature range and integrated thermal shutdown protect against fault conditions in factory environments where ambient temperatures vary widely.
Recomendado
Replacement for WS2812x / NeoPixel Designs
Engineers migrating from WS2812B or SK6812 "NeoPixel" discrete LED+driver modules to a discrete LED driver solution often select the TLC5947DAPR. It provides 12-bit grayscale (vs 8-bit on most NeoPixels), true 30 mA constant-current drive, and a deterministic refresh that eliminates the timing-sensitive single-wire protocol. One TLC5947DAPR can replace 24 individual NeoPixels while freeing the host MCU from bit-banged refresh routines, freeing CPU cycles for other tasks. The trade-off is BOM complexity: TLC5947DAPR needs an external IREF resistor and a regulated supply, whereas NeoPixels are drop-in modules. For designs that need higher bit depth and lower MCU overhead, the TLC5947DAPR is the clear choice.
Recomendado
Decorative and Ambient LED Strips
Long-run decorative LED strips in retail, hospitality, and home-automation installations benefit from the TLC5947DAPR's ability to drive 24 individually-dimmable channels from one IC, with the cascading serial interface allowing many ICs to share a single SPI bus. The 12-bit PWM gives smooth sunrise-to-sunset color fades, while the constant-current drive ensures consistent brightness across the strip regardless of voltage drop on long cable runs. The HTSSOP PowerPAD package handles the thermal load of continuous 720 mA operation when mounted on sufficient copper area. Designers often pair the TLC5947DAPR with an STM32 host running a DMX, DALI, or Bluetooth Mesh bridge for smart-building integration.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TLC5947DAPR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TLC5947DAP | TLC5947DAPRG4 | TLC5947PWP |
|---|---|---|---|---|
| Package | 32-HTSSOP (DAP) | 32-HTSSOP (DAP) | 32-HTSSOP (DAP) | HTSSOP-28 (PWP) - different pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Outputs | 24 | 24 | 24 | 24 |
| Output Current per Channel | 30 mA | 30 mA | 30 mA | 30 mA |
| PWM Resolution | 12-bit (4096 steps) | 12-bit (4096 steps) | 12-bit (4096 steps) | 12-bit (4096 steps) |
| Internal Oscillator | Yes | Yes | Yes | Yes |
| Carrier Packaging | Tape & Reel | Tube (tray) | Tape & Reel (green) | Tape & Reel |
| RoHS Compliance | Compliant | Compliant | Compliant (green) | Compliant |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Pinout / Footprint | 32-HTSSOP (DAP) standard | Identical | Identical | HTSSOP-28 - DIFFERENT |
Diferenciadores clave
- Internal PWM oscillator eliminates external clock (frente a TLC5941 (external PWM clock required))
- 12-bit grayscale vs 8-bit on WS2812x (frente a WS2812B NeoPixel)
- 30 mA true constant-current per channel (frente a WS2812B NeoPixel (~5-20 mA variable))
- Hardware-refreshed PWM free of MCU jitter (frente a MCU bit-banged PWM)
Notas de diseño
The 32-HTSSOP (DAP) package exposes a PowerPAD on the underside that MUST be soldered to a PCB copper pour of at least 1 square inch (645 mm^2) to keep the junction temperature within safe limits. Estimated: with 24 channels at 30 mA each, the device can sink up to 720 mA continuously. If VLED-VOUT drop per channel is 3 V, total power dissipation reaches 24 x 30 mA x 3 V = 2.16 W. Without PowerPAD copper, junction temperature will exceed the 150 C thermal-shutdown threshold under sustained load. Design 4-layer boards with a dedicated thermal via array under the PowerPAD.
Place the IREF resistor (typically 2 kOhm to 10 kOhm to set 5-30 mA global current) as close as possible to the IREF pin to minimize noise pickup and ground-loop induced current error. Use 1% tolerance or better for the IREF resistor to maintain channel-to-channel current matching within 1%. Decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the VCC pin, plus a 10 uF bulk capacitor on the same node.
Do not exceed the absolute maximum LED supply voltage per channel; consult the datasheet for VLED(max). Failing to solder the PowerPAD will cause thermal shutdown under load and is the most common field failure. Do not connect SIN/SOUT/SCLK/LATCH without proper pull-ups or termination in long-chain designs; use a series 100 Ohm resistor on SCLK if the chain exceeds 50 mm to reduce ringing. Avoid daisy-chaining across separate PCB modules without ground-reference sharing.
When daisy-chaining multiple TLC5947DAPR devices, the SOUT pin drives the SIN pin of the next device; this signal must remain clean across the chain. Place 22-100 Ohm series resistors near each SOUT pin if the chain spans more than 100 mm to dampen reflections. Keep the SPI traces short and away from switching power or LED current loops; route GND as a continuous plane under the chain. For chains longer than 1 meter, consider buffering the SOUT signal with a small logic buffer (e.g., 74LVC1G34) at each tap.
Información de cumplimiento
RoHS compliant per TI product page (R suffix and G4 variant denote lead-free versions). Not AEC-Q100 qualified - this is a commercial/industrial grade part. Operating temperature -40 C to +85 C covers industrial applications.
