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Diodes Incorporated ZXLD1356DACTC
- Part No.:
- ZXLD1356DACTC
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
ZXLD1356DACTC.pdf
- Description:
- IC LED DRVR RGLTR PWM 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,190
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Product details
Overview
ZXLD1356DACTC from Diodes Incorporated is a continuous-mode inductive step-down LED driver IC designed for automotive-grade constant-current LED lighting systems. It operates from 6V to 60V input, delivers up to 550mA output current with ±0.8% accuracy, and integrates an internal NDMOS switch (RDS(on) = 0.75Ω) and current-sense comparator. Used in vehicle headlamps, backup lamps, and interior lighting where AEC-Q100 Grade 1 compliance (−40°C to +125°C) and open-circuit LED protection are required.
For engineers reviewing the ZXLD1356DACTC datasheet, ZXLD1356DACTC pinout, ZXLD1356DACTC application, or ZXLD1356DACTC equivalent, this device supports single-pin DC/PWM dimming via the ADJ pin, achieves up to 97% efficiency at 360kHz switching frequency, and requires only external RS, LX inductor, and freewheeling diode for full operation - no external compensation needed.
Technical Context
The ZXLD1356DACTC implements a self-oscillating buck topology using internal hysteresis-based current-mode control. Its comparator compares VIN-referred ISENSE voltage (typ. 200mV threshold) against a programmable reference derived from the ADJ pin, enabling direct current regulation without error amplifier or external feedback loop.
Switching frequency varies with input voltage and LED string count (360kHz typical at 24V/3 LEDs), while duty cycle adjusts dynamically between 1%–99% to maintain constant current across wide VIN–VLED differentials. The ADJ pin simultaneously controls on/off state, analog dimming (0.3V–2.5V), and PWM dimming (up to 1000:1 ratio) via integrated low-pass filter and shutdown circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports 12V/24V/48V automotive and industrial rails without pre-regulation. |
| Max Output Current | 550mA - sets upper limit for single-string LED drive; adjustable down to 24% of nominal via ADJ pin voltage. |
| Current Accuracy | ±0.8% - ensures consistent luminance across temperature and unit-to-unit variation without calibration. |
| Switch RDS(on) | 0.75Ω @ TJ = 25°C - determines conduction loss and thermal rise; derates with junction temperature. |
| Dimming Control | DC voltage (0.3–2.5V) or PWM (≤300Hz) on ADJ pin - enables seamless integration with microcontroller GPIO or analog potentiometer. |
| Thermal Resistance θJA | 44°C/W (V-DFN3030-6) - defines maximum power dissipation (1.8W) before thermal shutdown at ambient 85°C. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C TA) - qualified for under-hood and exterior automotive lighting applications. |
Pinout & Package
V-DFN3030-6 package: 3.0mm × 3.0mm × 0.85mm body, exposed thermal pad (EP) connected to GND for enhanced heat dissipation. RoHS-compliant, halogen-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Switch node | Drains internal NDMOS; connects to inductor and freewheeling diode anode - must be routed with low-inductance layout. |
| GND | Power ground | Reference for all internal circuits; EP must be soldered to PCB ground plane for thermal performance. |
| ADJ | Multi-function control | Accepts DC voltage (0.3–2.5V) for analog dimming or PWM for digital dimming; floating = nominal current mode. |
| VIN | Main supply input | 6–60V rail; requires ≥4.7µF X7R ceramic capacitor placed within 3mm of pin for stability. |
| ISENSE | Current sense input | Connects to resistor RS between VIN and this pin; senses 200mV threshold to set IOUT = 0.2V / RS. |
Key Features
| Feature | Design Value |
|---|---|
| Inherent open-circuit LED protection | Auto-shutdown when ISENSE detects zero current - eliminates need for external fault detection circuitry. |
| Single-pin brightness control | ADJ pin handles on/off, analog dimming, and PWM dimming - reduces system BOM and MCU pin count. |
| High efficiency up to 97% | Minimizes thermal load in enclosed fixtures; enables higher LED power density without forced air cooling. |
| Thermally enhanced V-DFN3030-6 | θJA = 44°C/W - allows 1.8W continuous power dissipation at 85°C ambient, supporting >30W LED strings with proper heatsinking. |
| No external compensation required | Self-oscillating architecture eliminates loop compensation components - simplifies design and improves production yield. |
Applications
| Automotive Headlamps | Truck Brake & Turn Signals |
|---|---|
Use Scenario: Constant-current driver for high-brightness LED arrays in sealed headlamp modules. IC Role / Device Role / Timing Role: Primary LED current regulator with built-in overvoltage protection and thermal foldback. Use Value: Maintains stable lumen output across battery voltage swings (9–16V) and ambient temperatures (−40°C to +125°C). |
Use Scenario: Replacement for incandescent bulbs in rear combination lamps requiring fast PWM response. IC Role / Device Role / Timing Role: High-side current source with <800ns minimum off-time for 100Hz+ brake light flashing. Use Value: Enables 1000:1 dimming ratio for adaptive brightness control while meeting ECE R112 photometric requirements. |
| Industrial Emergency Lighting | Refrigeration Cabinet Illumination |
Use Scenario: Battery-backed LED driver for exit signs and emergency egress lighting. IC Role / Device Role / Timing Role: Input-voltage-agnostic current controller that operates from 12V–60V DC backup supplies. Use Value: Delivers precise 550mA output even during brownout conditions (6V min), ensuring code-compliant illumination duration. |
Use Scenario: Cold-environment LED lighting inside commercial refrigerated display cases. IC Role / Device Role / Timing Role: AEC-Q100 qualified driver operating reliably at −30°C ambient with minimal current drift. Use Value: Achieves ±0.8% current accuracy at −40°C, preventing visible flicker or color shift in food-retail lighting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Fixed 500mA output; no ADJ pin; requires external PWM for dimming. | Lacks analog dimming and single-pin control - less flexible for variable-brightness designs. | Choose for cost-sensitive, fixed-output applications where dimming is handled externally. |
| LM3409QMY/NOPB | Adjustable 1.5A output; requires external MOSFET and compensation network. | Higher current capability but larger solution size and design complexity. | Choose when driving multi-string or high-power LED arrays (>1A) with custom thermal management. |
Compared with AL8862SP-13 and LM3409QMY/NOPB, ZXLD1356DACTC offers integrated switching, single-pin dimming, and AEC-Q100 qualification in a compact 3×3mm package - making it optimal for space-constrained automotive and industrial LED modules requiring simplicity and reliability.
Availability
ZXLD1356DACTC is available at Aetrix Electronics and suitable for automotive lighting, industrial emergency systems, and refrigeration illumination requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for ZXLD1356DACTC 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 solutions for automotive, industrial, and consumer markets.
ZXLD1356DACTC belongs to Diodes' automotive-grade LED driver product line, engineered specifically for robust, high-efficiency constant-current operation in harsh environments with minimal external components.
FAQ
What is the minimum sense resistor value for ZXLD1356DACTC?
The minimum RS value is 0.36Ω when the ADJ pin is floating, yielding 555mA nominal output current and limiting peak switch current to 650mA. Using lower RS values risks exceeding the 0.65A absolute maximum LX current rating and may cause thermal shutdown or device failure.
Can ZXLD1356DACTC drive multiple parallel LED strings?
No - ZXLD1356DACTC regulates current in a single series string only. Driving parallel strings would cause current imbalance due to VF mismatch, risking thermal runaway. For multi-string applications, use one ZXLD1356DACTC per string or select a matrix-driver IC.
How does the ADJ pin function during PWM dimming?
When a PWM signal (≤300Hz, 0–5V amplitude) is applied to the ADJ pin, the internal low-pass filter converts it to an average DC voltage that modulates the current-sense threshold. This achieves smooth, low-noise dimming with up to 1000:1 ratio without audible coil whine.
Is the exposed pad (EP) electrically connected internally?
Yes - the EP is internally connected to the die substrate and must be soldered to the PCB's power ground plane. It serves as the primary thermal path and contributes significantly to θJA = 44°C/W; leaving it unconnected degrades thermal performance by >30%.
ZXLD1356DACTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 60V
- Current - Output / Channel:
- 550mA
- Frequency:
- 500kHz
- Dimming:
- PWM
- Applications:
- Lighting, Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- V-DFN3030-6
ZXLD1356DACTC FAQ
1.How can I place an order for ZXLD1356DACTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1356DACTC 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 ZXLD1356DACTC reliable?
The price and inventory of ZXLD1356DACTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1356DACTC is usually 5 days.
3.What payment methods are accepted for ZXLD1356DACTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1356DACTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1356DACTC?
ZXLD1356DACTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1356DACTC 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 ZXLD1356DACTC?
For technical support, including ZXLD1356DACTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1356DACTC requirements.
6.How does Aetrix verify that ZXLD1356DACTC is sourced from the original manufacturer or authorized distributors?
All ZXLD1356DACTC 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 ZXLD1356DACTC meets industry standards.
7.What is the process for return or replacement of ZXLD1356DACTC?
All ZXLD1356DACTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1356DACTC, 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 ZXLD1356DACTC part is unused and in its original packaging.
Return procedure for ZXLD1356DACTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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