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Diodes Incorporated ZXLD1356QDACTC
- Part No.:
- ZXLD1356QDACTC
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
ZXLD1356QDACTC.pdf
- Description:
- IC LED DRVR RGLTR PWM 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,065
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Product details
Overview
ZXLD1356QDACTC from Diodes Incorporated is an AEC-Q100 Grade 1 qualified continuous-mode inductive step-down LED driver IC designed for automotive and industrial lighting systems. It delivers up to 550mA output current with ±0.8% accuracy, operates from 6V–60V input, and integrates an internal NDMOS switch with 0.75Ω typical RDS(on). Used in headlamp modules and emergency lighting, it regulates LED current via external sense resistor (RS) and supports PWM dimming through the ADJ pin.
For engineers reviewing the ZXLD1356QDACTC datasheet, ZXLD1356QDACTC pinout, ZXLD1356QDACTC application, or ZXLD1356QDACTC equivalent, key selection criteria include its 60V input rating, thermally enhanced V-DFN3030-6 package (θJA = 44°C/W), AEC-Q100 qualification, 1000:1 PWM dimming ratio, and inherent open-circuit LED protection-critical for reliable operation in harsh ambient environments up to +125°C.
Technical Context
The ZXLD1356QDACTC implements a self-oscillating buck topology using internal comparator hysteresis (±15% of VADJ) and a fixed 200mV current-sense threshold referenced to VIN at the ISENSE pin. Its switching frequency varies with input voltage and LED string count-e.g., 360kHz at VIN=24V driving three 3.6V LEDs with 68µH inductor.
Operation relies on analog control of the LX switch via feedback from the ISENSE pin and multi-function ADJ pin, which simultaneously enables on/off control, DC brightness adjustment (0.3V–2.5V), soft-start timing (via capacitor), and low-frequency PWM dimming. The device maintains regulation without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide automotive battery range including cold-crank (6V) and load-dump (60V) transients. |
| Max Output Current | 550mA - sets upper limit for single-string LED drive; actual current set by RS = 0.36Ω (IOUTnom = 0.2V/RS). |
| Current Accuracy | ±0.8% - ensures consistent luminance across temperature (-40°C to +125°C) and unit-to-unit variation. |
| Switch RDS(on) | 0.75Ω typ. - determines conduction loss and thermal dissipation; enables >97% peak efficiency at optimal load points. |
| PWM Dimming Ratio | 1000:1 - allows precise low-light control in interior lighting and instrument backlighting applications. |
| Junction Temp Limit | +150°C - defines safe operating margin above AEC-Q100 Grade 1 ambient limit (+125°C). |
| Thermal Resistance θJA | 44°C/W - measured in V-DFN3030-6 package with proper PCB copper pour; enables 1.8W power dissipation at 25°C ambient. |
Pinout & Package
V-DFN3030-6 thermally enhanced wettable flank package with exposed pad (EP) tied to GND for improved heat transfer. Requires minimum 25 mm² 2-oz copper thermal pad under EP for rated θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Switch Drain Node | Connects to inductor and freewheeling diode anode; carries pulsed high-side switch current up to 0.65A peak. |
| GND | Power Ground (Pins 2 & 5) | Reference for all internal circuits; must be low-impedance path to EP and system ground plane. |
| ADJ | Multi-function Control Pin | Accepts DC voltage (0.3–2.5V) for linear dimming or PWM signal for 1000:1 brightness control; also enables soft-start via capacitor. |
| VIN | Main Power Input | 6–60V supply input; requires ≥4.7µF X7R ceramic decoupling capacitor placed within 3mm of pin. |
| ISENSE | Current Sense Input | High-side sense node referenced to VIN; measures voltage drop across external RS to regulate LED current. |
Key Features
| Feature | Design Value |
|---|---|
| Inherent open-circuit LED protection | Disables LX switch automatically if ISENSE detects no current flow-prevents overvoltage stress during LED string failure. |
| Single-pin dimming & on/off control | Eliminates need for separate enable and dim pins; reduces BOM count and routing complexity in space-constrained modules. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40°C to +125°C ambient, including HTOL, TC, and ESD testing per Rev. G requirements. |
| No external compensation required | Self-oscillating architecture with internal hysteresis provides stable loop response across input voltage and LED forward voltage variations. |
| Green molding compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); fully RoHS-compliant with lead-free finish and no purposely added lead. |
Applications
| Automotive Headlamps | Emergency Vehicle Lighting |
|---|---|
Use Scenario: Driving 3–7 white LEDs in low-beam headlamp modules powered from 12V/24V vehicle battery with load-dump immunity. IC Role / Device Role / Timing Role: Primary constant-current LED driver with integrated switch; regulates average current independent of LED VF drift and input voltage transients. Use Value: Maintains ±0.8% current accuracy over -40°C to +125°C ambient, enabling consistent photometric output without recalibration. |
Use Scenario: Powering red/blue LED arrays in police, fire, and ambulance warning lights requiring rapid flashing and high reliability. IC Role / Device Role / Timing Role: High-efficiency current source with PWM-compatible ADJ pin enabling synchronized flash patterns at variable duty cycles. Use Value: 1000:1 dimming ratio supports both daylight-visible flash intensity and nighttime-safe low-level illumination modes. |
| Refrigeration Cabinet Lighting | Industrial SELV Signage |
Use Scenario: Illuminating interior shelves in commercial refrigerators where ambient temperature ranges from -20°C to +5°C and humidity is high. IC Role / Device Role / Timing Role: Constant-current driver with open-circuit protection preventing damage when LED strings disconnect due to condensation or vibration. Use Value: AEC-Q100 qualification ensures long-term reliability under thermal cycling and mechanical shock conditions typical in transport refrigeration units. |
Use Scenario: Driving low-voltage LED signs in retail environments powered from isolated 24V SELV supplies with strict safety compliance requirements. IC Role / Device Role / Timing Role: Isolated-output LED controller that eliminates need for optocouplers or secondary-side sensing in Class II installations. Use Value: 60V max input rating accommodates worst-case SELV supply ripple while maintaining Class II creepage/clearance distances. |
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 dimming; requires external PWM generator; lower max input (40V). | Lacks integrated dimming control-suitable only for static-brightness designs with external microcontroller PWM. | Select when cost sensitivity outweighs dimming flexibility and input voltage stays below 40V. |
| LM3409QMY/NOPB | Adjustable current via external resistor; supports higher peak current (1.25A); requires external compensation network. | Higher complexity due to external compensation and gate driver; better suited for multi-string or high-power (>10W) designs. | Choose for applications needing >550mA or dual-string drive, accepting added design effort and BOM count. |
Compared with AL8862SP-13 and LM3409QMY/NOPB, the ZXLD1356QDACTC offers integrated dimming, wider input range, and simpler layout-making it optimal for compact, single-string automotive and industrial LED systems requiring AEC-Q100 compliance and minimal external components.
Availability
ZXLD1356QDACTC is available at Aetrix Electronics and suitable for automotive lighting, emergency vehicle signaling, and industrial refrigeration lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZXLD1356QDACTC 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.
The ZXLD1356Q series belongs to Diodes' automotive-grade LED driver product line, engineered specifically for robust, high-reliability lighting in vehicles and harsh-environment equipment.
FAQ
What is the function of the ADJ pin on the ZXLD1356QDACTC?
The ADJ pin serves three functions: (1) DC voltage input (0.3–2.5V) to adjust LED current from 24% to 200% of nominal; (2) PWM input for 1000:1 dimming; (3) connection point for soft-start capacitor (≈0.2ms/nF). When left floating, it defaults to 1.25V reference, setting nominal current via RS.
Can the ZXLD1356QDACTC drive multiple LED strings in parallel?
No-it is designed for single-series LED strings only. Parallel string operation is not supported due to lack of individual current regulation per string, risking current imbalance and thermal runaway. For multi-string applications, use one ZXLD1356QDACTC per string or select a multi-channel driver.
What is the minimum recommended sense resistor value for ZXLD1356QDACTC?
The minimum RS is 0.36Ω when the ADJ pin is floating, yielding 555mA nominal output current (IOUTnom = 0.2V/RS). Using lower values risks exceeding the 0.65A peak switch current limit and violating absolute maximum ratings-derating is required below VIN = 16V.
How does the ZXLD1356QDACTC handle open-circuit LED conditions?
When ISENSE detects zero current (i.e., open LED string), the internal comparator disables the LX switch and forces the device into quiescent mode with <5µA leakage. This prevents uncontrolled LX voltage rise and protects external components-no external fault circuitry is needed.
ZXLD1356QDACTC 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
ZXLD1356QDACTC FAQ
1.How can I place an order for ZXLD1356QDACTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1356QDACTC 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 ZXLD1356QDACTC reliable?
The price and inventory of ZXLD1356QDACTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1356QDACTC is usually 5 days.
3.What payment methods are accepted for ZXLD1356QDACTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1356QDACTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1356QDACTC?
ZXLD1356QDACTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1356QDACTC 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 ZXLD1356QDACTC?
For technical support, including ZXLD1356QDACTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1356QDACTC requirements.
6.How does Aetrix verify that ZXLD1356QDACTC is sourced from the original manufacturer or authorized distributors?
All ZXLD1356QDACTC 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 ZXLD1356QDACTC meets industry standards.
7.What is the process for return or replacement of ZXLD1356QDACTC?
All ZXLD1356QDACTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1356QDACTC, 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 ZXLD1356QDACTC part is unused and in its original packaging.
Return procedure for ZXLD1356QDACTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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