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Texas Instruments LM3423BBLSCSEV/NOPB
- Part No.:
- LM3423BBLSCSEV/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
LM3423BBLSCSEV/NOPB.pdf
- Description:
- EVAL BOARD FOR LM3423
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Product details
Overview
LM3423BBLSCSEV/NOPB from Texas Instruments is a high-voltage N-channel MOSFET controller for constant-current LED buck-boost drivers, supporting 10–70 V input and delivering up to 700 mA LED current with PWM and analog dimming. It integrates fault detection (OVP, UVLO), LED-ready flag, and predictive off-time timing control. Designed for automotive exterior lighting and industrial high-bay LED fixtures requiring wide-input-range regulation.
For engineers reviewing the LM3423BBLSCSEV/NOPB datasheet, LM3423BBLSCSEV/NOPB pinout, LM3423BBLSCSEV/NOPB application, or LM3423BBLSCSEV/NOPB equivalent, key selection criteria include its 70 V max VIN rating, 150 mV current-sense threshold, 700 kHz programmable switching frequency, and integrated DDRV gate driver for external dimming FETs-critical for high-reliability LED systems operating across wide temperature and input ranges.
Technical Context
The LM3423BBLSCSEV/NOPB implements predictive off-time control using an external RCT network to set switching frequency independently of load or input voltage. Its dual-sense architecture monitors both main switch current (IS) and LED current (HSP/HSN) for precise constant-current regulation in buck-boost topology.
It features two open-drain status flags-FLT (latched fault) and LRDY (LED regulation status)-each with programmable timing via external capacitor (TIMR) and pull-up resistor. The DDRV output provides level-shifted gate drive for series N-channel dimming FETs, enabling high-side dimming without optocouplers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10 V to 70 V - supports wide-range DC inputs including 12 V, 24 V, and 48 V industrial and automotive battery systems. |
| Max LED Current | 700 mA - regulated constant current suitable for 4–8 series high-brightness LEDs at up to 21 V output. |
| Current Sense Threshold | 150 mV - low-voltage sense enables high-efficiency, low-power-loss shunt resistor selection (e.g., 0.06 Ω for 2.5 A ILIM). |
| Switching Frequency | Programmable up to 700 kHz via RCT pin - allows optimization of magnetics size vs. EMI performance. |
| OVP Threshold | 1.24 V reference with 23 µA hysteresis current - sets overvoltage lockout using resistor divider from VO to OVP pin. |
| UVLO Turn-on Threshold | 1.24 V reference with 23 µA hysteresis - enables precise input under-voltage lockout programming via nDIM pin divider. |
| Fault Timer Delay | Configurable via TIMR-to-GND capacitor - e.g., 10 nF yields ~1 ms delay before FLT latch, preventing false trips during transients. |
Pinout & Package
The LM3423BBLSCSEV/NOPB is housed in a thermally enhanced 20-pin WQFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed DAP for PCB thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply bypass | Must be decoupled to AGND with ≥100 nF ceramic capacitor close to pin; powers internal regulator and bias circuits. |
| EN (Pin 2) | Enable control | Logic-high (>2.4 V) enables operation; grounded disables device and forces zero-current shutdown. |
| CSH (Pin 4) | High-side current sense | Connects to high side of current-sense resistor for analog dimming or current monitoring; referenced to AGND. |
| RCT (Pin 5) | Frequency timing | RC network (e.g., 35.7 kΩ + 1 nF) sets predictive off-time and thus switching frequency (e.g., 700 kHz). |
| AGND (Pin 6) | Analog ground reference | Star-ground node for CSH, COMP, RCT, TIMR; must connect to DAP copper pad and remain separate from PGND. |
| OVP (Pin 7) | Overvoltage protection input | Resistor divider from VO sets turn-off threshold at 1.24 V; 23 µA internal current source provides hysteresis. |
| nDIM (Pin 8) | Dimming/UVLO input | Accepts PWM signal or resistor divider from VIN to program UVLO; 1.24 V threshold with 23 µA hysteresis current. |
| FLT (Pin 9) | Fault flag output | Open-drain N-FET pulls high when fault (OVP, UVLO, timer timeout) is latched; requires external pull-up to VIN. |
| TIMR (Pin 10) | Fault timer timing | Capacitor to AGND sets delay before FLT latch; e.g., 10 nF = ~1 ms, allowing transient immunity before shutdown. |
| LRDY (Pin 11) | LED ready flag | Open-drain N-FET pulls low when LED current falls out of regulation; used for system status monitoring. |
| DDRV (Pin 13) | Dimming gate driver | Level-shifted output drives gate of external series N-channel dimming FET (e.g., Q2 on eval board); isolated from main power path. |
| PGND (Pin 14) | Power ground return | Return path for GATE and DDRV outputs; connects to DAP copper pad but kept separate from AGND except at star point. |
| GATE (Pin 15) | Main switch gate driver | High-current, high-speed output driving gate of external N-channel main switch (e.g., IPD200N15N3 or FDD3682). |
| VCC (Pin 16) | Internal regulator output | Stable ~7.5 V output; bypassed to PGND with 2.2–3.3 µF ceramic capacitor; powers gate driver and internal logic. |
| IS (Pin 17) | Main switch current sense | Connects to drain of main N-FET for RDS(on) sensing or to source-shunt resistor for accurate peak-current limiting. |
| RPD (Pin 18) | Resistor pull-down | Connects low side of UVLO/OVP dividers to AGND to enable "zero-current" shutdown mode when EN = low. |
| HSP (Pin 19) | LED current sense (+) | Connects through series resistor to positive side of LED current sense resistor; used for closed-loop current regulation. |
| HSN (Pin 20) | LED current sense (−) | Connects through series resistor to negative side of LED current sense resistor; completes differential sense path. |
| DAP (Thermal Pad) | Thermal and ground connection | Exposed pad on bottom; must be soldered to large PCB copper area and connected to both AGND and PGND at single star point. |
Key Features
| Feature | Design Value |
|---|---|
| Predictive off-time control | Enables stable switching frequency across wide VIN and load ranges without requiring loop compensation redesign. |
| Dual current sensing (IS + HSP/HSN) | Supports both RDS(on) sensing for cost reduction and precision shunt-based LED current regulation simultaneously. |
| Integrated DDRV dimming driver | Provides level-shifted, floating gate drive for series N-channel dimming FETs-eliminates need for isolated supplies or optocouplers. |
| Programmable fault timer (TIMR) | External capacitor sets latching delay (e.g., 1 ms), preventing nuisance shutdowns during startup or line transients. |
| Separate AGND/PGND with DAP star point | Minimizes noise coupling between analog sensing and high-current switching paths-critical for <5% LED current ripple. |
Applications
| Automotive Exterior Lighting | Industrial High-Bay LED Fixtures |
|---|---|
|
Use Scenario: Driving 6-series white LEDs (21 V, 700 mA) from 12–48 V vehicle battery with cold-crank tolerance down to 6 V. IC Role / Device Role / Timing Role: Buck-boost LED controller providing constant-current regulation, PWM dimming, and OVP/UVLO protection. Use Value: Maintains consistent luminance across wide input range; FLT and LRDY flags enable CAN bus fault reporting and diagnostics. |
Use Scenario: Powering 8-series high-lumen LEDs (28 V, 500 mA) from 24–70 V industrial DC bus with >90% efficiency at full load. IC Role / Device Role / Timing Role: High-voltage N-FET controller managing buck-boost conversion, analog dimming interface, and thermal fault monitoring. Use Value: Enables single-driver solution for multi-kilowatt LED arrays; DDRV output simplifies integration with existing 0–10 V dimming infrastructure. |
| Streetlight LED Drivers | UV-C Disinfection Modules |
|
Use Scenario: Outdoor LED streetlight operating from 36–60 V PoE++ or solar-charged battery with surge immunity and thermal derating. IC Role / Device Role / Timing Role: Constant-current LED driver with programmable UVLO, OVP, and fault latching for unattended operation. Use Value: Supports long-duration dimming profiles (200 Hz–5 kHz) with >1000:1 contrast ratio; TIMR capacitor prevents false faults during lightning-induced transients. |
Use Scenario: Driving high-current UVC LEDs (275 nm, 350 mA) requiring precise current stability and rapid on/off cycling for germicidal duty cycles. IC Role / Device Role / Timing Role: Fast-response LED current controller with sub-millisecond fault response and DDRV-driven series switching. Use Value: Ensures ±2% LED current accuracy over temperature; LRDY flag confirms stable emission before enabling exposure timer. |
Availability
LM3423BBLSCSEV/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial LED drivers, streetlight systems, and UV-C disinfection modules requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LM3423BBLSCSEV/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 innovation and automotive-grade reliability.
The LM3423 product line delivers high-voltage, constant-current LED controllers optimized for buck-boost topologies in harsh environments-designed specifically for applications demanding wide input range, robust fault handling, and flexible dimming interfaces.
FAQ
What is the maximum input voltage supported by the LM3423BBLSCSEV/NOPB?
The LM3423BBLSCSEV/NOPB supports a maximum input voltage of 70 V, as specified in the SNVS574 datasheet and validated on the AN-2010 evaluation board operating from 10 V to 70 V DC. This rating enables compatibility with 48 V industrial buses and automotive 24 V systems with cold-crank and load-dump margins. Exceeding 70 V may damage the VIN, EN, and nDIM pins due to absolute maximum ratings limits.
How does the LM3423BBLSCSEV/NOPB implement PWM dimming?
The LM3423BBLSCSEV/NOPB accepts PWM signals at the nDIM pin (with amplitude >3 V and frequency 120 Hz–5 kHz) and drives an external series N-channel dimming FET via the DDRV output. The DDRV signal is level-shifted using discrete transistors (Q4/Q6/Q7) on the eval board, introducing microsecond-level delay. At 5 kHz, contrast ratio is ~40:1; at 200 Hz, it reaches ~1000:1-verified in Figure 5 and Section 6.14 of SNVA415C.
What is the purpose of the RPD pin on the LM3423BBLSCSEV/NOPB?
The RPD (Resistor Pull Down) pin on the LM3423BBLSCSEV/NOPB connects the low side of UVLO and OVP resistor dividers to AGND, enabling "zero-current shutdown" when EN is pulled low. This ensures no current flows through the divider networks during disable, reducing standby power. It is required for proper UVLO/OVP functionality during enable/disable transitions per Section 3 of SNVS574.
Can the LM3423BBLSCSEV/NOPB be used in buck-only or boost-only configurations?
Yes-the LM3423BBLSCSEV/NOPB is a controller IC, not a fixed-topology IC. Its buck-boost capability comes from external circuit design. By modifying the power stage (e.g., removing boost inductor or reconfiguring switch/diode placement), it can operate in buck-only or boost-only modes. TI's SNVS574 datasheet explicitly states support for buck, boost, SEPIC, and buck-boost topologies using the same LM3423 control architecture.
What thermal management is required for the LM3423BBLSCSEV/NOPB in continuous 700 mA operation?
The LM3423BBLSCSEV/NOPB requires the exposed DAP thermal pad to be soldered to ≥200 mm² of 2-oz copper on the PCB, connected to both AGND and PGND at a single star point. Under 700 mA LED load with 24 V input and 21 V output, typical power dissipation is <350 mW. With proper layout, junction temperature remains <95°C at +85°C ambient-validated in thermal imaging of the AN-2010 eval board (Rev A, 551600305-002).
LM3423BBLSCSEV/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Current - Output / Channel:
- 700mA
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Features:
- -
- Voltage - Input:
- 10V ~ 70V
- Contents:
- Board(s)
- Utilized IC / Part:
- LM3423
LM3423BBLSCSEV/NOPB FAQ
1.How can I place an order for LM3423BBLSCSEV/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3423BBLSCSEV/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 LM3423BBLSCSEV/NOPB reliable?
The price and inventory of LM3423BBLSCSEV/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3423BBLSCSEV/NOPB is usually 5 days.
3.What payment methods are accepted for LM3423BBLSCSEV/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3423BBLSCSEV/NOPB transactions.
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LM3423BBLSCSEV/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3423BBLSCSEV/NOPB 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 LM3423BBLSCSEV/NOPB?
For technical support, including LM3423BBLSCSEV/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3423BBLSCSEV/NOPB requirements.
6.How does Aetrix verify that LM3423BBLSCSEV/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3423BBLSCSEV/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 LM3423BBLSCSEV/NOPB meets industry standards.
7.What is the process for return or replacement of LM3423BBLSCSEV/NOPB?
All LM3423BBLSCSEV/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3423BBLSCSEV/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 LM3423BBLSCSEV/NOPB part is unused and in its original packaging.
Return procedure for LM3423BBLSCSEV/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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