My Inquiry
My Account
Diodes Incorporated AL3353S-13
- Part No.:
- AL3353S-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AL3353S-13.pdf
- Description:
- IC LED DRIVER CTRLR PWM 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:11,159
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AL3353S-13 from Diodes Incorporated is a fixed-frequency, current-mode PWM boost LED controller optimized for LCD TV and monitor backlighting. It regulates LED current via external sense resistor with 400mV ±1.5% reference, supports 5–50kHz PWM-to-analog dimming, and integrates OCP, OVP, UVLO, OTP, and short-circuit protections. Operates from 9V to 40V input and delivers precise constant-current drive in SO-8 (TH2) package.
For engineers reviewing the AL3353S-13 datasheet, AL3353S-13 pinout, AL3353S-13 application, or AL3353S-13 equivalent, this device is selected for high-accuracy LED current regulation in cost-sensitive display backlight systems requiring robust fault coverage, wide dimming range, and stable operation across industrial temperature range (−40°C to +105°C).
Technical Context
The AL3353S-13 implements peak-current mode control with internal transconductance error amplifier (70dB open-loop gain, 100µA/V gm) and built-in slope compensation to prevent subharmonic oscillation above 50% duty cycle. It uses a 120kHz nominal oscillator frequency and features cycle-by-cycle overcurrent detection on the CS pin.
Startup is enabled by PWM pin logic high (>2.5V), triggering internal 5V regulator activation and soft-start ramping at 22mV/ms. Protection logic includes latched shutdown for LED open, cathode-to-GND short (via COMP >3.2V for 37ms), diode/inductor short (CS >1.2V for 17 cycles), and thermal shutdown at +160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9V to 40V - supports wide-range DC supplies including 12V/24V industrial rails and automotive-derived inputs. |
| Feedback Reference Voltage | 400mV ±1.5% - enables <±3% LED current accuracy with standard 1% sense resistors. |
| Oscillator Frequency | 120kHz (typ) - balances EMI performance and inductor size for backlight boost converters. |
| PWM Dimming Frequency | 5kHz to 50kHz - avoids audible noise while enabling smooth analog dimming via external PWM signal. |
| UVLO Threshold | 8.3V (rising), 7.5V (falling) with 800mV hysteresis - ensures clean power-up/down sequencing without brownout oscillation. |
| OCP Threshold Voltage | 500mV (typ) - sets MOSFET overcurrent limit independent of temperature drift via external RSENSE. |
| OVP Threshold | 2.0V (typ) on OVP pin - corresponds to ~60V output when using standard 30:1 divider, protecting against LED open failure. |
Pinout & Package
AL3353S-13 is housed in a Pb-free SO-8 package (Type TH2), thermally optimized for surface-mount assembly with θJA = 105°C/W on 1"×1" FR-4 board (2oz Cu).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power supply input | Accepts 9–40V DC; powers internal regulators and gate driver; requires local bulk capacitance. |
| 2 GATE | High-side MOSFET gate driver output | Drives N-channel power MOSFET with 13V max output swing, 40ns rise/20ns fall into 1nF load. |
| 3 GND | Analog and power ground reference | Single-point return for feedback, sensing, and power paths; critical for noise immunity and stability. |
| 4 CS | Current sense input | Monitors voltage across external sense resistor; triggers OCP at 500mV and short-protection at 1.2V. |
| 5 FB | LED current feedback node | Compares sensed LED current to 400mV reference; determines regulated current via RFB per ILED = 400mV/RFB. |
| 6 COMP | Error amplifier compensation node | Connects RC network to set loop bandwidth and phase margin; also monitored for cathode-short latch (≥3.2V/37ms). |
| 7 OVP | Output overvoltage sense input | Divides boost output to detect LED open condition; shuts down GATE if voltage drops below 150mV (startup) or exceeds 2.0V (fault). |
| 8 PWM | Dimming control input | Accepts 5–50kHz PWM signal; logic high (>2.5V) enables operation and sets analog dimming level via internal averaging. |
Key Features
| Feature | Design Value |
|---|---|
| PWM-to-analog dimming | Enables flicker-free brightness control from 0–100% using standard MCU PWM outputs without external DAC or filter. |
| Integrated slope compensation | Prevents subharmonic oscillation at >50% duty cycle; optional external RSL allows fine-tuning for low-inductance designs. |
| Latched LED open protection | Detects open-circuit LED strings via OVP pin and disables GATE until reset by VIN cycle or PWM low pulse >20ms. |
| Cathode-to-GND short detection | Monitors COMP pin voltage to catch failure modes where OVP threshold isn't reached-prevents MOSFET/diode thermal runaway. |
| Diode/inductor short protection | Shuts down after 17 consecutive CS >1.2V cycles-avoids destructive current buildup during component-level shorts. |
Applications
| LCD TV Backlight | LCD Monitor Backlight |
|---|---|
|
Use Scenario: Driving parallel LED strings in 32–75 inch LCD TVs with local dimming zones. IC Role / Device Role / Timing Role: Primary boost controller regulating constant current to white LED arrays; synchronizes dimming with video frame rate via PWM input. Use Value: Delivers ±3% current matching across strings and maintains stable output under 9–24V input variation typical in TV power supplies. |
Use Scenario: Powering edge-lit LED bars in 15–32 inch desktop monitors with adaptive brightness control. IC Role / Device Role / Timing Role: Constant-current LED driver with integrated protection; accepts host MCU PWM signals for ambient-light-adjusted dimming. Use Value: Eliminates need for external current-sense amplifiers or discrete protection circuits-reducing BOM count by ≥4 components. |
| Flat Panel Display Module | Commercial Digital Signage |
|
Use Scenario: Integrated backlight solution in embedded flat panel displays used in kiosks and medical panels. IC Role / Device Role / Timing Role: Standalone LED controller managing up to 120mA per string; operates across −40°C to +105°C ambient range. Use Value: Full protection suite ensures reliability in unventilated enclosures-no field failures due to LED open, cathode short, or thermal overload. |
Use Scenario: High-brightness outdoor signage requiring sustained LED drive under variable solar-powered input. IC Role / Device Role / Timing Role: Robust boost controller handling 36V nominal input with transient tolerance up to 43V. Use Value: UVLO hysteresis and OVP latching prevent erratic behavior during battery voltage sag or solar charge fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3367-AEC1 | Automotive-grade AEC-Q100 qualified; higher 65V VIN max; no integrated OVP sense pin-requires external comparator. | Targeted for automotive infotainment displays; lacks cathode-short and diode-short detection logic. | Select when AEC-Q100 compliance and extended input range are mandatory; accept added external circuitry for OVP. |
| LM3409HV | Adjustable 50–1000kHz switching frequency; no built-in slope compensation-requires external ramp injection. | Used in high-efficiency architectural lighting; lacks PWM-to-analog dimming-requires external DAC or filter. | Choose for ultra-low-noise or high-frequency EMI-sensitive designs; expect increased layout complexity and calibration effort. |
Compared with MPQ3367-AEC1 and LM3409HV, the AL3353S-13 offers integrated dimming conversion, comprehensive fault latching, and plug-and-play protection-reducing design time and validation risk for consumer display applications without automotive or ultra-high-frequency requirements.
Availability
AL3353S-13 is available at Aetrix Electronics and suitable for LCD TV backlighting, LCD monitor backlighting, and flat panel display modules requiring stable component supply, full RoHS compliance, and long-term production continuity.
Supply support for AL3353S-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 for power management, signal integrity, and connectivity applications.
The AL3353 belongs to Diodes' LED lighting controller product line, engineered specifically for cost-effective, high-reliability backlight solutions in consumer displays-emphasizing integration, protection completeness, and ease of system-level qualification.
FAQ
What is the minimum PWM dimming frequency supported by AL3353S-13?
The AL3353S-13 supports PWM dimming frequencies from 5kHz to 50kHz. At 5kHz, it provides full 0–100% dimming range without audible noise, verified in typical LCD TV reference designs. Frequencies below 5kHz may cause visible flicker or instability in the internal averaging circuit.
How does AL3353S-13 handle LED open-circuit failure?
When an LED string opens, output voltage rises until the OVP pin voltage exceeds 2.0V, triggering latched shutdown of the GATE driver. The device remains off until reset by cycling VIN or holding PWM low for >20ms. This prevents capacitor overvoltage and secondary component stress.
Can AL3353S-13 operate with input voltage below 9V?
No. The AL3353S-13 has a guaranteed operating input range of 9V to 40V. Below 7.8V (UVLO falling threshold), the IC disables all functions. Startup requires VIN ≥8.3V (typical UVLO rising threshold); operation below 9V is outside specification and not characterized.
Is external slope compensation required for stable operation?
External slope compensation is optional. The AL3353S-13 includes internal slope compensation sufficient for most boost designs with duty cycles ≤95%. Adding an external resistor (RSL) in the CS path is recommended only when using very low-inductance chokes or operating near maximum duty cycle with marginal phase margin.
AL3353S-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 130kHz
- Dimming:
- Analog, PWM
- Applications:
- LCD TV/Monitor, Flat Panel Display
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO Type TH
AL3353S-13 FAQ
1.How can I place an order for AL3353S-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL3353S-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 AL3353S-13 reliable?
The price and inventory of AL3353S-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL3353S-13 is usually 5 days.
3.What payment methods are accepted for AL3353S-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL3353S-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL3353S-13?
AL3353S-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL3353S-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 AL3353S-13?
For technical support, including AL3353S-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL3353S-13 requirements.
6.How does Aetrix verify that AL3353S-13 is sourced from the original manufacturer or authorized distributors?
All AL3353S-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 AL3353S-13 meets industry standards.
7.What is the process for return or replacement of AL3353S-13?
All AL3353S-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL3353S-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 AL3353S-13 part is unused and in its original packaging.
Return procedure for AL3353S-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AL3353S-13 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
