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Texas Instruments LM3450AEV230V30/NOPB
- Part No.:
- LM3450AEV230V30/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
LM3450AEV230V30/NOPB.pdf
- Description:
- EVAL BOARD FOR LM3450A
- Quantity:
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Product details
Overview
LM3450AEV230V30/NOPB from Texas Instruments is a phase-dimmable LED driver controller with integrated active power factor correction (PFC) for 230V AC input, supporting 25–100W isolated flyback topologies. It delivers 500Hz PWM dimming output, critical conduction mode (CRM) PFC operation, and dynamic hold circuitry optimized for high-power 230V designs.
For engineers reviewing the LM3450AEV230V30/NOPB datasheet, LM3450AEV230V30/NOPB pinout, LM3450AEV230V30/NOPB application, or LM3450AEV230V30/NOPB equivalent, key selection considerations include its continuous dynamic hold architecture (vs. sampled hold in LM3450), 230V/25W+ design suitability, CRM-based PFC compliance (>0.95 PF), and isolated feedback interface via optocoupler-coupled COMP/FB.
Technical Context
The LM3450AEV230V30/NOPB implements dual-function control: a CRM-based PFC loop using ZCD-synchronized switching and multiplier-based current shaping, plus a phase-angle decoder that samples rectified VAC to generate a remapped 500Hz PWM signal. Its error amplifier supports both non-isolated (FB voltage divider) and isolated (5.11kΩ FB-to-GND bypass + opto-coupled COMP) configurations.
Unlike the LM3450, the LM3450A variant features continuously active dynamic hold - eliminating triac misfire risk in high-capacitance 230V inputs - and operates across −40°C to +125°C junction temperature with internal thermal shutdown at 160°C. The device integrates pre-regulator BIAS output, GATE driver capable of ±1.5A peak, and precision references (VREF = 3.0V ±150mV, VFB = 2.50V ±70mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 8.5V to 20V - powers internal bias and gate driver; enables startup from pre-regulator BIAS output. |
| PFC Mode | Critical Conduction Mode (CRM) - achieves >0.95 power factor with zero-current switching and low EMI. |
| DIM Output Frequency | 180–700 Hz (typ. 500 Hz) - decoded PWM dimming signal compatible with downstream LED drivers. |
| Junction Temp Range | −40°C to +125°C - supports industrial and outdoor SSL applications without derating below 125°C ambient. |
| Dynamic Hold | Continuous operation - ensures reliable triac firing in 230V/25W+ systems, unlike sampled hold in LM3450. |
| VREF Accuracy | 2.85V to 3.15V - stable 3.0V reference for VADJ scaling and analog dimming calibration. |
| CS Current Limit | 1.40V to 1.60V threshold - sets PFC MOSFET overcurrent protection at system level. |
Pinout & Package
LM3450AEV230V30/NOPB is housed in a 16-lead TSSOP package (Package Number PW), thermally optimized for surface-mount LED driver PCBs with θJA = 38.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Output | 3.0V precision reference; used to bias VADJ or external circuits directly. |
| VADJ | Analog Adjust Input | Sets dimming range: connected to VREF for standard 70% range, resistor divider for extension, or GND for low-power mode. |
| FLT2 | Second Filter Pole | Configures second-order filtering for phase angle decoding stability. |
| FLT1 | First Filter Pole | Establishes primary filter pole for clean VAC sampling and noise rejection. |
| DIM | Open-Drain PWM Output | 500Hz PWM signal sent to secondary-stage LED driver (directly or via optocoupler). |
| VAC | Rectified Line Sampling | Accepts resistor-divider scaled AC line voltage for phase angle detection and multiplier feed. |
| COMP | Error Amplifier Output | Drives optocoupler LED in isolated designs; pre-biased at startup to enable soft-start. |
| FB | Feedback Input | Bypassed with 5.11kΩ to GND in isolated flyback; enables OVP and short-circuit protection. |
| ISEN | Input Current Sense | Monitors bridge return current to trigger dynamic hold when input drops below 200mV threshold. |
| GND | Power Ground | Common reference for all analog and power circuits; must be low-impedance plane. |
| CS | Current Sense Input | Connects to PFC MOSFET source sense resistor; triggers PWM comparator at 1.5V threshold. |
| GATE | Gate Driver Output | ±1.5A peak drive for N-channel PFC MOSFET; includes 2–8Ω pull-down resistance. |
| VCC | Supply Input | 8.5–20V bias input; internally regulated; quiescent current 1.6mA (no switching). |
| ZCD | Zero-Crossing Detector | Detects transformer demagnetization to terminate off-time and enable ZVS in CRM operation. |
| HOLD | Dynamic Hold Input | Open-drain input tied to holding resistor; enables continuous hold current in LM3450A variant. |
| BIAS | Pre-regulator Gate Bias | Drives pass-FET gate during startup; outputs 13.5–22.6V depending on VCC state. |
Key Features
| Feature | Design Value |
|---|---|
| Critical Conduction Mode PFC | Enables >0.95 power factor with low THD and inherent ZVS for high efficiency in 230V/25W+ LED drivers. |
| Continuous Dynamic Hold | Eliminates triac misfire in high-input-capacitance 230V systems - distinguishing LM3450A from LM3450's sampled hold. |
| 500Hz Phase-Decoded PWM | Remaps triac phase angle to smooth, flicker-free dimming command compatible with standard LED drivers. |
| Isolated Feedback Support | FB pin bypassed with 5.11kΩ resistor enables optocoupler-coupled COMP loop - essential for safety-isolated flyback designs. |
| Programmable Dimming Range | VADJ pin accepts resistor divider from VREF to extend usable dimming range beyond 70% for legacy dimmers. |
| Integrated Startup Pre-regulator | BIAS output drives pass-FET during initial charge; eliminates need for auxiliary winding or external bias supply. |
Applications
| Dimmable Downlights & Troffers | Large-Form-Factor LED Bulbs |
|---|---|
|
Use Scenario: Indoor commercial lighting fixtures operating from 230V AC mains with trailing-edge or leading-edge phase dimmers. IC Role / Device Role / Timing Role: Primary controller managing both PFC regulation and phase-angle decoding; generates isolated 500Hz PWM for secondary LED current driver. Use Value: Enables Class C IEC 61000-3-2 compliance and smooth 1–100% dimming without audible noise or flicker in 30–80W systems. |
Use Scenario: Retrofit A19/E27 LED bulbs requiring high-efficiency, compact, and dimmer-compatible AC-DC conversion. IC Role / Device Role / Timing Role: Single-chip solution integrating CRM PFC and dimming decoder - replaces discrete PFC + microcontroller + opto combo. Use Value: Reduces BOM count by ≥4 components while maintaining >0.95 PF and full compatibility with ELV/MLV dimmers. |
| Outdoor Area Lighting | Industrial SSL Power Supplies |
|
Use Scenario: Streetlight or parking lot luminaires exposed to wide ambient temperature swings and 230V grid variations. IC Role / Device Role / Timing Role: Robust PFC controller with continuous dynamic hold and thermal shutdown (160°C) ensuring reliable dimmer operation down to −40°C. Use Value: Maintains consistent dimming performance and PF >0.92 across −40°C to +85°C ambient without recalibration. |
Use Scenario: Industrial LED signage or machine vision lighting requiring stable DC output under fluctuating line conditions. IC Role / Device Role / Timing Role: Active PFC front-end controller delivering regulated bus voltage to downstream constant-current LED drivers. Use Value: Provides 385V DC bus with <1.5% ripple and <5% load regulation - enabling precise current control in multi-string arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3450MHE/NOPB | LM3450 (not A) variant in HTSSOP-16; uses sampled dynamic hold instead of continuous hold. | Suitable for 230V designs <25W or 120V designs <15W; higher risk of triac misfire above those thresholds. | Select LM3450MHE/NOPB only if operating below 25W at 230V and cost sensitivity outweighs reliability requirements. |
| UCC28064ADR | Standalone CRM PFC controller (no dimming decoder); requires external MCU or analog circuit for phase decoding. | Used in fixed-output or non-dimmable PFC stages; lacks integrated 500Hz PWM generation and VADJ programmability. | Choose UCC28064ADR when dimming is handled externally or when higher PFC efficiency (>0.99) is prioritized over integration. |
Compared with LM3450MHE/NOPB, LM3450AEV230V30/NOPB provides guaranteed triac hold in 230V/25W+ systems; compared with UCC28064ADR, it eliminates external decoding hardware but trades off some PFC optimization flexibility.
Availability
LM3450AEV230V30/NOPB is available at Aetrix Electronics and suitable for dimmable LED downlights, outdoor area lighting, and industrial SSL power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3450AEV230V30/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in LED driver and power factor correction solutions.
The LM3450A product line was designed specifically for single- and two-stage dimmable LED drivers targeting 10–100W output with integrated PFC and phase-dimming decoding - addressing the need for compact, compliant, and flicker-free SSL systems.
FAQ
What is the key functional difference between LM3450AEV230V30/NOPB and LM3450?
The LM3450AEV230V30/NOPB implements continuous dynamic hold current, whereas the LM3450 uses sampled hold. This ensures reliable triac firing in 230V systems above 25W, where input capacitance and line impedance increase misfire risk. LM3450AEV230V30/NOPB is explicitly rated for 230V/25W+ designs per TI's application guidance, making it the correct choice for high-power European and Asian mains applications.
Can LM3450AEV230V30/NOPB be used in non-isolated boost PFC topologies?
Yes, LM3450AEV230V30/NOPB supports non-isolated boost configurations. In such designs, the FB pin connects to a resistor divider from the output bus to regulate voltage, and the internal error amplifier remains active. However, the device's primary validation and reference designs focus on isolated flyback due to safety requirements in most LED lighting applications - non-isolated use requires careful attention to creepage/clearance and transient immunity.
What is the purpose of the VADJ pin on LM3450AEV230V30/NOPB?
The VADJ pin on LM3450AEV230V30/NOPB sets the usable dimming range for phase decoders. Connecting it directly to VREF yields the standard 70% dimming range. Using a resistor divider from VREF extends the range for compatibility with legacy dimmers exhibiting narrow conduction angles. Grounding VADJ enables low-power mode, reducing quiescent consumption during standby - a feature confirmed in the Electrical Characteristics table (VADJ-LP = 56–75 mV).
Does LM3450AEV230V30/NOPB include over-voltage protection?
Yes, LM3450AEV230V30/NOPB includes dedicated over-voltage protection (OVP) triggered at the FB pin. When FB voltage exceeds 1.22×VFB (≈3.05V), the device disables switching and enters latch-off mode. This protects downstream LED strings and bulk capacitors from overvoltage events caused by open feedback loops or optocoupler failure - a function verified in the Electrical Characteristics table under VFB-OV parameter.
What thermal management considerations apply to LM3450AEV230V30/NOPB in a 230V/60W design?
In a 230V/60W design, LM3450AEV230V30/NOPB dissipates ~0.8W typical. With θJA = 38.0°C/W, a 4-layer PCB with 2 oz copper and thermal vias under the TSSOP-16 package is required to maintain junction temperature ≤125°C at 60°C ambient. The device includes thermal shutdown at 160°C (20°C hysteresis), but sustained operation near this limit degrades long-term reliability - board layout must prioritize heatsinking at GND and POWER pads per TI's Layout Guidelines in SNVS681D.
LM3450AEV230V30/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Current - Output / Channel:
- 700mA
- Outputs and Type:
- 1 Isolated Output
- Voltage - Output:
- 50V
- Features:
- Dimmable
- Voltage - Input:
- 180 ~ 265 VAC
- Contents:
- Board(s)
- Utilized IC / Part:
- LM3450A
LM3450AEV230V30/NOPB FAQ
1.How can I place an order for LM3450AEV230V30/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3450AEV230V30/NOPB 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 LM3450AEV230V30/NOPB reliable?
The price and inventory of LM3450AEV230V30/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3450AEV230V30/NOPB is usually 5 days.
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5.How can I obtain technical support or documentation for LM3450AEV230V30/NOPB?
For technical support, including LM3450AEV230V30/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3450AEV230V30/NOPB requirements.
6.How does Aetrix verify that LM3450AEV230V30/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3450AEV230V30/NOPB 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 LM3450AEV230V30/NOPB meets industry standards.
7.What is the process for return or replacement of LM3450AEV230V30/NOPB?
All LM3450AEV230V30/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3450AEV230V30/NOPB, 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 LM3450AEV230V30/NOPB part is unused and in its original packaging.
Return procedure for LM3450AEV230V30/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3450AEV230V30/NOPB Tags
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