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Diodes Incorporated AL58221T24E-13
- Part No.:
- AL58221T24E-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
AL58221T24E-13.pdf
- Description:
- LED LINEAR DRIVER TSSOP-24EP T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
AL58221T24E-13 from Diodes Incorporated is a 12-channel constant-current RGB LED driver (R/G/B × 4) with Adaptive Pulse Density Modulation (APDM), operating from 3V to 5.5V, delivering up to 60mA per channel with ±1% typical channel-to-channel current accuracy and 24V-rated open-drain sinking outputs. It supports 16-bit grayscale at >1000Hz visual refresh rate and is used in high-resolution indoor LED video displays.
For engineers reviewing the AL58221T24E-13 datasheet, AL58221T24E-13 pinout, AL58221T24E-13 application, or AL58221T24E-13 equivalent, key selection criteria include APDM vs. PWM waveform selection, external resistor–set current programming (REXT_A/B/C), cascading capability (up to 1,030 devices), and dual-edge-triggered 2-wire serial interface (DI/DCKI) for EMI-sensitive LED signage systems.
Technical Context
The AL58221 implements a 12-channel parallel constant-current sink architecture with independent REXT-based current setting per RGB group, adaptive pulse density modulation (APDM) for flicker-free 16-bit grayscale rendering, and internal clock re-timing with duty recovery to maintain signal integrity across long daisy-chained configurations. Its 208-bit shift register accepts 16-bit command + 192-bit grayscale data (12 × 16-bit).
It features dual-clock domains: a 10MHz double-edge-triggered DCKI for serial data transfer and a programmable grayscale clock (GCKI or internal oscillator, 6.25–9.8MHz) governing APDM/PWM timing. Output rise/fall times are software-selectable via hspd bit, and polarity inversion enables high-side switching support in conjunction with external P-MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 12 constant-current sinking outputs (R/G/B × 4); enables full-color pixel control in 4-segment RGB modules. |
| Max Output Current | 60mA @ 5V VDD; sufficient to drive standard 20mA–50mA RGB LEDs with margin for thermal derating. |
| Current Accuracy | ±1% (typ.) channel-to-channel; ensures uniform brightness across all 12 outputs without per-channel calibration. |
| Grayscale Depth | 8/12/14/16-bit selectable; 16-bit mode achieves >1000Hz visual refresh rate to eliminate perceptible flicker. |
| Data Interface | 2-wire serial (DI/DCKI) with double-edge sampling; supports 140kbps–20Mbps, enabling EMI-optimized low-speed or high-throughput modes. |
| Output Voltage Rating | 24V max off-state voltage; supports long LED strings (e.g., 7× white LEDs @ 3.4V) without external HV transistors. |
| Cascading Capacity | Up to 1,030 devices; enabled by DCKO/DO forwarding and clock duty recovery for stable multi-chip timing alignment. |
Pinout & Package
TSSOP-24EP (Type A1-B) package with exposed thermal pad; 0.65mm pitch, 7.8mm × 4.4mm body, optimized for high-power LED driver thermal dissipation (θJA = 28°C/W on 51mm × 51mm 2oz FR-4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 REXT_C, REXT_B, REXT_A |
Current-setting reference inputs | Each connects to GND via dedicated resistor to set average current for C/B/A RGB groups (e.g., 2340Ω → 25mA @ 5V). |
| 4, 7, 16, 19 OUTC[0:3] |
Constant-current sink outputs | Open-drain outputs for blue LED strings; rated to 24V, support PWM/APDM dimming with bilateral EMI processing. |
| 5, 8, 17, 20 OUTB[0:3] |
Constant-current sink outputs | Open-drain outputs for green LED strings; matched current accuracy with OUTA/OUTC for RGB balance. |
| 6, 9, 18, 21 OUTA[0:3] |
Constant-current sink outputs | Open-drain outputs for red LED strings; identical electrical specs to OUTB/OUTC for consistent color point stability. |
| 10 GCKI |
External grayscale clock input | Accepts 10MHz max CMOS clock; selected via osc bit to override internal oscillator for synchronized multi-driver timing. |
| 11 DCKI |
Data clock input | Double-edge-triggered (rising + falling) clock; enables 2× data throughput and lower EMI vs. single-edge interfaces. |
| 12 DCKO |
Data clock output | Re-timed, duty-corrected DCKI replica; drives next device's DCKI in cascade, eliminating skew accumulation. |
| 13 DI |
Serial data input | Accepts 208-bit frame (16-bit cmd + 192-bit grayscale); sampled on both DCKI edges for robust noise immunity. |
| 14 DO |
Serial data output | Forwarded DI data after internal retiming; enables seamless daisy-chaining without external buffering. |
| 15 GCKO |
Grayscale clock output | Outputs internal oscillator or buffered GCKI based on osc command bit; synchronizes grayscale timing across cascaded units. |
| 23 VDD |
Power supply input | 3.0–5.5V operation; supports direct connection to 3.3V or 5V system rails with ±0.6% supply regulation error. |
| 24 GND |
Ground reference | Common return for all currents (max 750mA total sink); requires low-impedance plane due to high-frequency switching. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Pulse Density Modulation (APDM) | Increases effective visual refresh rate to >1000Hz at 16-bit grayscale while reducing EMI vs. conventional PWM. |
| Bilateral EMI Processing | Processes current waveform on both rising and falling edges of APDM pulses to suppress common-mode noise in LED arrays. |
| Internal Clock Retiming & Duty Recovery | Compensates for clock distortion in long cascades; maintains <200ns stop-time margin even at 1,030-device depth. |
| Programmable Output Trise/Tfall | hspd bit selects fast/slow slew rates to balance EMI reduction against switching loss in high-frequency LED driving. |
| ±0.1% Output Voltage Regulation | Maintains current stability across 1–3V LED forward voltage variation, critical for mixed-bin or aging LED strings. |
Applications
| Indoor LED Video Displays | Architectural Lighting |
|---|---|
|
Use Scenario: High-density rental LED panels (P1.2–P2.5) requiring flicker-free 16-bit grayscale and seamless tile-to-tile brightness uniformity. IC Role / Device Role / Timing Role: 12-channel constant-current sink driving R/G/B subpixels per pixel; APDM provides >1000Hz visual refresh synchronized across 100+ cascaded drivers. Use Value: Eliminates visible scanning lines and temporal aliasing in camera-captured content, meeting broadcast-grade image fidelity requirements. |
Use Scenario: Controllable RGBW linear fixtures for façade lighting, where long cable runs and multi-unit synchronization are required. IC Role / Device Role / Timing Role: Cascadable LED driver with DCKO/DO forwarding and GCKO clock distribution; supports >100m daisy chains with duty recovery. Use Value: Enables single-master timing control across hundreds of fixtures without external clock buffers or complex cabling topologies. |
| Digital Signage | Transportation Signs |
|
Use Scenario: Outdoor full-color billboards exposed to wide temperature ranges (−40°C to +85°C) and demanding uptime requirements. IC Role / Device Role / Timing Role: Constant-current driver with ±1% channel matching and ±2% inter-device accuracy; operates reliably across industrial ambient range. Use Value: Ensures consistent color gamut and luminance over lifetime, minimizing field recalibration and maintenance costs. |
Use Scenario: Dynamic bus/train destination signs using high-brightness RGB LEDs with strict EMC compliance (CISPR 25 Class 5). IC Role / Device Role / Timing Role: APDM + bilateral EMI processing + double-edge data interface reduces radiated emissions below 150MHz limit. Use Value: Passes automotive-grade EMC testing without added ferrites or shielding, lowering BOM cost and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59284RTJR | 16-channel, 12-bit PWM only (no APDM), 20V max output, no clock re-timing or cascading support. | Limited to short-chain, non-synchronized signage; lacks flicker mitigation for camera capture. | Select when grayscale depth ≤12-bit suffices and cascade count ≤5; avoid for broadcast or long-run architectural use. |
| IS31FL3729-QFLS4-TR | 18-channel, I²C interface, integrated EEPROM, 36V output, but no APDM or DCKO cascading capability. | Suitable for compact, self-contained modules; requires host MCU intervention per frame update. | Prefer for space-constrained designs needing local storage and I²C simplicity; not viable for high-speed, multi-chip video walls. |
Compared with TLC59284RTJR and IS31FL3729-QFLS4-TR, the AL58221T24E-13 uniquely combines APDM flicker suppression, hardware-based cascading with duty recovery, and 24V output rating-making it the only choice for large-scale, EMI-sensitive, high-refresh-rate RGB video systems.
Availability
AL58221T24E-13 is available at Aetrix Electronics and suitable for indoor LED video displays, architectural lighting systems, and digital signage requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AL58221T24E-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design and manufacturing facilities certified to IATF 16949 and ISO 9001 standards.
The AL58221 belongs to Diodes' high-performance LED driver product line, engineered specifically for demanding visual applications requiring flicker-free grayscale, precise current matching, and scalable multi-device timing synchronization.
FAQ
What is the maximum number of AL58221T24E-13 devices that can be cascaded, and what limits this count?
The AL58221T24E-13 supports up to 1,030 devices in cascade, limited by the minimum internal-latch stop time (Tstop ≥ 200ns + N×10ns). At 1,030 units, Tstop must exceed 12.3μs to ensure reliable data retiming and clock duty recovery across the chain. This is verified in Diodes' DS46476 Rev. 2, page 7, Note 19.
How does the AL58221 achieve ±1% channel-to-channel current accuracy without per-channel DACs?
It uses matched internal current mirror circuitry referenced to three precision external resistors (REXT_A/B/C), one per RGB group. Each group's 4 channels share the same REXT, ensuring intra-group matching; inter-group variation is minimized by layout symmetry and process trimming. Electrical Characteristics tables (DS46476 p.5–6) confirm ±1% typical skew under VOUT = 1.0V, Rrext = 2340Ω.
Can the AL58221T24E-13 drive 24V LED strings directly, and what is the safe operating voltage margin?
Yes-the device specifies VOUT_off = −0.3V to +24V absolute maximum, with recommended operation up to 24V. At 24V, the internal MOSFET remains within SOA when sinking ≤60mA, provided junction temperature stays ≤125°C (per Package Thermal Data, θJA = 28°C/W). Derating is required above 85°C ambient per Figure 12 (I-V curve).
What is the functional difference between APDM and standard PWM modes, and how is it selected?
APDM spreads energy across more frequent, narrower pulses to raise perceived refresh rate (>1000Hz at 16-bit) and reduce EMI; PWM uses fixed-frequency, variable-width pulses. Mode is selected via CMD[4] (sep bit): '0' = MY-PWM (traditional), '1' = APDM. Grayscale resolution (CMD[9:8]) and clock source (CMD[3]) must be configured accordingly per DS46476 p.14.
AL58221T24E-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- No
- Number of Outputs:
- 12
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 24V
- Current - Output / Channel:
- 60mA
- Frequency:
- -
- Dimming:
- PWM, Two-Wire
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP-EP (Type A1-B)
AL58221T24E-13 FAQ
1.How can I place an order for AL58221T24E-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL58221T24E-13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AL58221T24E-13 reliable?
The price and inventory of AL58221T24E-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL58221T24E-13 is usually 5 days.
3.What payment methods are accepted for AL58221T24E-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL58221T24E-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL58221T24E-13?
AL58221T24E-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL58221T24E-13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AL58221T24E-13?
For technical support, including AL58221T24E-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL58221T24E-13 requirements.
6.How does Aetrix verify that AL58221T24E-13 is sourced from the original manufacturer or authorized distributors?
All AL58221T24E-13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AL58221T24E-13 meets industry standards.
7.What is the process for return or replacement of AL58221T24E-13?
All AL58221T24E-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL58221T24E-13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AL58221T24E-13 part is unused and in its original packaging.
Return procedure for AL58221T24E-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AL58221T24E-13 Tags
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