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Texas Instruments TPS923655DMTR
- Part No.:
- TPS923655DMTR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
TPS923655DMTR.pdf
- Description:
- 65-V, 4-A BOOST ORBUCK-BOOST LED
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
TPS923655DMTR from Texas Instruments is a 65V, 4A non-synchronous boost/buck-boost LED driver with integrated 150mΩ low-side NMOS FET, supporting inductive fast dimming (IFD), hybrid/flexible dimming up to 1,000,000:1 at 120Hz, and spread spectrum EMI reduction. It operates from 4.5V–63V input, delivers constant-current LED drive or constant-voltage battery/TEC control, and targets high-precision machine vision flash and medical surgical lighting.
For engineers reviewing the TPS923655DMTR datasheet, TPS923655DMTR pinout, TPS923655DMTR application, or TPS923655DMTR equivalent, key selection criteria include its 6.5A cycle-by-cycle current limit, VSON-14 package thermal performance (RθJA = 39.1°C/W), 150ns minimum PWM pulse width support, configurable 100kHz–2.2MHz switching frequency, and dual-dimming-input logic for analog/PWM/hybrid mode selection.
Technical Context
The TPS923655DMTR implements adaptive off-time current-mode control with smart sampling to enable inductive fast dimming (IFD), achieving high dimming accuracy across 120Hz–20kHz PWM frequencies. Its error amplifier output (COMP) interfaces with external RC networks to set loop bandwidth, while FSET pin resistance selects switching frequency from 100kHz to 2.2MHz with ±7% spread spectrum modulation.
Dimming mode is determined at startup by logic states on EN/PWM and ADIM/HD pins: hybrid dimming (EN/PWM = PWM signal, ADIM/HD = low) enables 12.5–100% analog control + 0–12.5% PWM control; flexible dimming (both pins = PWM) decouples analog and PWM paths. The device supports common-cathode LED topology and single-layer PCB layout via integrated power switch and ground separation (PGND/AGND).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 63V - supports wide-range industrial and automotive LED systems without pre-regulation. |
| Max Output Current | 4A - sustained LED drive capability with 6.5A cycle-by-cycle current limit for transient surge handling. |
| Switching Frequency | 100kHz to 2.2MHz - selectable via FSET resistor; higher frequencies reduce inductor size, lower frequencies improve efficiency. |
| Dimming Resolution | 1,000,000:1 at 120Hz - achieved via hybrid dimming combining analog control (12.5–100%) and PWM (0–12.5%). |
| Min PWM Pulse Width | 150ns - enables ultra-fast strobe timing for machine vision and camera flash synchronization. |
| Thermal Protection | Configurable thermal foldback (via TEMP pin resistor) + 165°C shutdown - ensures reliability under sustained high-power operation. |
| Package | VSON-14 (4.5mm × 3.0mm) - compact footprint with 39.1°C/W junction-to-ambient thermal resistance for high-power density designs. |
Pinout & Package
VSON-14 package (4.5mm × 3.0mm) with exposed thermal pad; 14-pin top-view layout optimized for thermal dissipation and single-layer PCB routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND / AGND | Power and analog ground | Separate PGND (pin 1) and AGND (pin 2) minimize noise coupling; thermal pad connects to both for enhanced heat transfer. |
| VIN | Main power input | Accepts 4.5–63V; powers internal LDO and switching FET; UVLO triggers at ~3.0V rising threshold. |
| VCC | Internal LDO output | 5.15V regulated supply for control circuitry; requires 1μF capacitor to AGND for soft-start timing. |
| EN/PWM | Enable or PWM dimming input | Pull high for always-on; apply PWM signal for direct PWM dimming; minimum 150ns pulse width supported. |
| ADIM/HD | Analog dimming or hybrid dimming select | Pull low for hybrid dimming; apply PWM for analog dimming; logic state at startup configures dimming mode per Table 7-2. |
| FAULT | Open-drain fault indicator | Pulls low on LED open/short, FET failure, thermal shutdown, or overvoltage; requires external pull-up for system monitoring. |
| FSET | Frequency setting input | Resistor to AGND sets switching frequency (e.g., 59kΩ = 400kHz); enables EMI optimization via spread spectrum (enabled on TPS923655). |
| COMP | Error amplifier output | Connects to external compensation network (RC) to stabilize current regulation loop; bandwidth adjustable per application. |
| CSP / CSN | Current sense differential inputs | Monitor LED current via external sense resistor; 200mV reference enables precise ILED calculation (RSENSE = 0.2V / ILED). |
| SW | Switching node | Drives external inductor and Schottky diode; connects internally to 150mΩ low-side NMOS FET. |
Key Features
| Feature | Design Value |
|---|---|
| Inductive Fast Dimming (IFD) | Enables sub-microsecond LED current transitions via adaptive off-time control and smart sampling-critical for strobe synchronization in machine vision. |
| Hybrid Dimming (120Hz) | Delivers 1,000,000:1 dimming ratio by combining analog control above 12.5% brightness and PWM below-eliminates flicker while preserving resolution. |
| Spread Spectrum Modulation | ±7% frequency dithering at 2kHz reduces peak EMI emissions, easing compliance with CISPR-25 Class 5 without increasing filter size or cost. |
| Configurable Thermal Foldback | Resistor on TEMP pin sets custom thermal derating curve-allows trade-off between maximum output power and junction temperature in constrained enclosures. |
| Full System Protection | Integrated detection of LED open/short, sense resistor faults, cycle-by-cycle current limit, and thermal shutdown-reduces need for external supervision circuitry. |
Applications
| Machine Vision Flash | Medical Surgical Lighting |
|---|---|
Use Scenario: High-speed synchronized illumination for industrial inspection cameras capturing objects moving at >5 m/s. IC Role / Device Role / Timing Role: LED driver with 150ns PWM edge response and IFD enabling precise microsecond-level strobe timing. Use Value: Eliminates motion blur by matching LED on-time to camera exposure window; supports >100k frames/sec imaging. |
Use Scenario: Adjustable-intensity lighting in sterile operating rooms requiring flicker-free, color-stable illumination during prolonged procedures. IC Role / Device Role / Timing Role: Constant-current LED controller with hybrid dimming delivering 1,000,000:1 range at 120Hz-no perceptible flicker. Use Value: Enables smooth, stepless brightness control from surgical spotlight to ambient room lighting without visible artifacts. |
| LCD Backlighting | Battery Charging |
Use Scenario: Dynamic contrast enhancement in commercial displays using local dimming zones driven by high-efficiency LED strings. IC Role / Device Role / Timing Role: CC/CV-capable driver operating in constant-voltage mode to regulate backlight string voltage while maintaining current stability. Use Value: Supports wide input (12–48V) and high output voltage (up to 63V) for multi-string configurations; improves display contrast ratio by 3×. |
Use Scenario: Single-chip solution for charging 2–4S Li-ion/LiPo batteries in portable medical devices or ruggedized test equipment. IC Role / Device Role / Timing Role: Constant-voltage source with programmable OVP (via OVP pin) and thermal foldback-replaces discrete charger IC + DC-DC stage. Use Value: Reduces BOM count by 4 components; maintains ±1% CV accuracy across -40°C to 125°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS923653DMTR | Same VSON-14 package and 3A current limit, but lacks 6.5A capability; spread spectrum enabled. | Lower power LED arrays (<2A average), where EMI sensitivity outweighs peak current demand. | Select when system power budget is ≤3A and spread spectrum is mandatory for EMC compliance. |
| TPS923654DMTR | Same VSON-14 package and 6.5A current limit, but spread spectrum disabled-optimized for brightness stability. | High-brightness projector or laser TV backlighting where spectral purity and minimal brightness ripple are critical. | Select when EMI is managed externally and absolute dimming linearity at low duty cycles is prioritized over spread spectrum. |
Compared with TPS923655DMTR, TPS923653DMTR trades peak current headroom for identical EMI performance, while TPS923654DMTR sacrifices spread spectrum to maximize optical stability-making TPS923655DMTR the balanced choice for high-power, EMI-sensitive, and dimming-critical applications like machine vision and surgical lighting.
Availability
TPS923655DMTR is available at Aetrix Electronics and suitable for machine vision flash systems, medical surgical lighting, LCD backlighting, and battery charging applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS923655DMTR 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 technologies, with decades of expertise in high-reliability LED drivers and power conversion ICs.
The TPS92365x product line was designed specifically for high-dynamic-range LED applications demanding simultaneous high efficiency, ultra-fast dimming, and robust protection-targeting machine vision, medical, and professional lighting markets.
FAQ
What dimming modes does the TPS923655DMTR support, and how are they selected?
The TPS923655DMTR supports four dimming modes: PWM, analog, hybrid, and flexible dimming. Selection occurs at startup based on logic states applied to EN/PWM and ADIM/HD pins per Table 7-2 in the datasheet. For example, hybrid dimming activates when EN/PWM receives a PWM signal and ADIM/HD is pulled low. All modes leverage the same 150ns minimum pulse width capability, and hybrid dimming achieves 1,000,000:1 range at 120Hz by combining analog control (12.5–100%) with PWM control (0–12.5%). The TPS923655DMTR's adaptive off-time control ensures accurate current regulation across all modes.
Does the TPS923655DMTR include spread spectrum EMI reduction, and how is it configured?
Yes, the TPS923655DMTR has spread spectrum enabled by default-unlike TPS923652/TPS923654 variants. It modulates switching frequency by ±7% at 2kHz to reduce peak EMI emissions without external components. No configuration is required; the feature is hardwired into the die. This allows smaller input filters and easier compliance with CISPR-25 Class 5 in automotive and industrial environments. The TPS923655DMTR maintains full 100kHz–2.2MHz frequency adjustability via the FSET pin resistor while applying spread spectrum around the selected center frequency.
What is the maximum continuous LED current the TPS923655DMTR can deliver in boost configuration?
The TPS923655DMTR is rated for 4A continuous LED current in boost or buck-boost topologies, supported by its 6.5A cycle-by-cycle current limit and thermal design. In VSON-14 package with proper PCB copper area (≥4 cm² thermal pad connection), it sustains 4A at ambient temperatures up to 85°C with 63V input. Derating applies above that: at 125°C junction temperature, output current reduces to ~2.8A. The 150mΩ integrated MOSFET and 39.1°C/W RθJA enable this performance without external switches. TPS923655DMTR's current sense threshold is fixed at 200mV, so RSENSE = 0.2V / ILED determines actual current setting.
How does the TPS923655DMTR handle thermal management, and can the foldback behavior be customized?
The TPS923655DMTR provides two-tier thermal protection: configurable thermal foldback (via resistor on TEMP pin) and fixed 165°C shutdown. The foldback curve is set by connecting a resistor between TEMP and AGND-e.g., 20kΩ initiates foldback at 130°C. This allows designers to define the junction temperature vs. output current relationship before shutdown occurs. Unlike fixed-threshold alternatives, TPS923655DMTR lets engineers balance power delivery against enclosure constraints. The VSON-14 package's low RθJB (14.7°C/W) further enhances thermal performance when mounted on 2oz copper with thermal vias.
Is the TPS923655DMTR suitable for battery charging applications, and what protections apply?
Yes, the TPS923655DMTR supports constant-voltage (CV) mode for battery charging, including 2–4S Li-ion and lead-acid chemistries. It uses the OVP pin to set precise overvoltage thresholds via resistor dividers, and the COMP pin regulates voltage with external compensation. Protections include cycle-by-cycle current limiting, thermal shutdown, and fault reporting via open-drain FAULT pin. Unlike dedicated charger ICs, TPS923655DMTR lacks charge termination logic but excels in high-voltage (>30V) or high-current (>3A) charging where integrated power stage and wide input range are critical. Its CC/CV capability makes TPS923655DMTR ideal for portable medical device battery packs and ruggedized test equipment.
TPS923655DMTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 63V
- Voltage - Output:
- 0V ~ 63V
- Current - Output / Channel:
- 4A
- Frequency:
- 100kHz ~ 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VSON (4.5x3)
TPS923655DMTR FAQ
1.How can I place an order for TPS923655DMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS923655DMTR 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 TPS923655DMTR reliable?
The price and inventory of TPS923655DMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS923655DMTR is usually 5 days.
3.What payment methods are accepted for TPS923655DMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS923655DMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS923655DMTR?
TPS923655DMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS923655DMTR 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 TPS923655DMTR?
For technical support, including TPS923655DMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS923655DMTR requirements.
6.How does Aetrix verify that TPS923655DMTR is sourced from the original manufacturer or authorized distributors?
All TPS923655DMTR 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 TPS923655DMTR meets industry standards.
7.What is the process for return or replacement of TPS923655DMTR?
All TPS923655DMTR units undergo pre-shipment inspection (PSI). If there is an issue with TPS923655DMTR, 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 TPS923655DMTR part is unused and in its original packaging.
Return procedure for TPS923655DMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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