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Texas Instruments LM5015MH/NOPB
- Part No.:
- LM5015MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5015MH/NOPB.pdf
- Description:
- IC REG FLYBACK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:195
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Product details
Overview
LM5015MH/NOPB from Texas Instruments is a high-voltage monolithic two-switch forward DC-DC regulator IC integrating dual 75V N-channel MOSFETs, supporting input voltages from 4.25V to 75V, delivering isolated output regulation via current-mode control, and targeting industrial power supplies, telecom rectifiers, and distributed power architectures.
For engineers reviewing the LM5015MH/NOPB datasheet, LM5015MH/NOPB pinout, LM5015MH/NOPB application, or LM5015MH/NOPB equivalent, key selection considerations include its 1.26V ±1.5% feedback reference, 200 kHz typical switching frequency (programmable up to 750 kHz), integrated cycle-by-cycle current limiting at 1.2A, thermal shutdown at 165°C, and HTSSOP-14EP package with exposed thermal pad.
Technical Context
The LM5015MH/NOPB implements current-mode control using an internal error amplifier driving the COMP pin, with peak-current sensing derived from a 42 mΩ internal sense resistor on the low-side MOSFET source. Its oscillator uses a single RT resistor for frequency setting (25 kHz–750 kHz) and supports external synchronization via the RT pin with ≥3.2V threshold and ≥15 ns pulse width.
It employs a two-switch forward topology where both MOSFETs are integrated - high-side drain connected to PVIN, source to HO; low-side drain to LO, source tied to PGND through the sense resistor. The maximum duty cycle is hardware-limited to <50% (e.g., 49% at 200 kHz) to ensure transformer reset, and bias is supplied either via internal VCC LDO (regulated to 6.9V above 6.9V VIN) or external 7–14V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.25V to 75V - enables direct operation from 48V telecom, 60V industrial, or wide-range DC bus without pre-regulation. |
| Feedback Reference Voltage | 1.26V ±1.5% - ensures precise output voltage regulation in both isolated and non-isolated configurations. |
| Switching Frequency | 200 kHz typical (RRT = 31.6 kΩ) - balances efficiency, magnetics size, and EMI performance for medium-power converters. |
| Integrated MOSFETs | Dual 75V N-channel, RDS(on) ≤ 0.93 Ω (low-side), ≤ 0.90 Ω (high-side) - eliminates external high-voltage switches and reduces BOM count. |
| Current Limit Threshold | 1.2A peak cycle-by-cycle - protects internal MOSFETs and external magnetics during overload or short-circuit events. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage under sustained overloads or poor heatsinking. |
| Package | HTSSOP-14EP with exposed pad - provides low θJA = 40°C/W and θJC = 6.6°C/W for reliable thermal management in compact layouts. |
Pinout & Package
LM5015MH/NOPB is housed in a thermally enhanced HTSSOP-14EP (Exposed Pad) package. The exposed pad must be soldered to PCB ground plane and connected to AGND/PGND for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND | Analog ground reference | Internal reference for error amplifier and PWM comparator; must be star-connected to PGND near IC to minimize switching noise coupling. |
| RT | Oscillator programming & sync input | Resistor-to-AGND sets frequency; accepts external sync pulses >3.2V with 100 pF AC coupling - enables multi-phase or EMI-controlled operation. |
| FB | Non-isolated feedback input | Connects to inverting input of error amplifier; used when output is referenced to primary side - 1.26V internal reference sets regulation point. |
| COMP | Error amplifier output / opto-coupler drive | Open-drain output with 5 kΩ internal pull-up; drives opto-coupler LED in isolated designs or external compensation network in non-isolated topologies. |
| CFB | Isolated current feedback input | Accepts mirrored opto-coupler current for high-bandwidth secondary-side regulation - maintains stable loop response across line/load transients. |
| PGND | Power ground return | Internal connection to low-side MOSFET source and current sense resistor - requires low-inductance path to input capacitor negative terminal. |
| LO | Low-side MOSFET drain | Switch node for low-side FET; connects to transformer primary center-tap or flyback winding - must be routed with minimal loop area. |
| PVIN | High-side MOSFET drain supply | Direct connection to main input rail; handles full input voltage stress - decoupling capacitor must be placed adjacent to PVIN and PGND. |
| HO | High-side MOSFET source | Switch node for high-side FET; forms bootstrap return path - ties to BST capacitor negative terminal and transformer primary end. |
| BST | Bootstrap capacitor connection | Charged via internal diode from VCC during LO conduction; requires ≥0.022 µF ceramic capacitor between BST and HO for gate drive integrity. |
| VCC | Bias regulator output/input | Internally regulated to 6.9V (for VIN >6.9V); accepts external 7–14V supply to reduce dissipation - requires ≥0.47 µF ceramic decoupling. |
| VIN | Analog control supply input | Powers internal logic and LDO; operates from 4.25V–75V - can be separated from PVIN for improved noise immunity or efficiency in high-VIN applications. |
| EN | Enable / UVLO input | Two-threshold control: <0.45V = shutdown (170 µA IQ), 0.45–1.26V = VCC enabled only, >1.26V = full operation - supports programmable input undervoltage lockout. |
| SS | Soft-start timing capacitor | 11 µA internal current source charges external capacitor to ramp COMP voltage - prevents inrush current and output overshoot during startup. |
| EP | Exposed thermal pad | Electrically connected to PGND; must be soldered to large copper pour for thermal conduction and EMI reduction - not a signal pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual 75V N-channel MOSFETs | Eliminates need for external high-voltage switches and associated gate drivers - reduces component count, layout complexity, and failure points in two-switch forward/flyback designs. |
| Ultra-wide 4.25V–75V input range | Supports direct interface with unregulated 48V telecom, 60V industrial, or battery-backed DC buses without front-end buck pre-regulators. |
| Programmable 25 kHz–750 kHz oscillator | Enables optimization of magnetic size vs. efficiency vs. EMI; RT resistor placement and value directly determine operating frequency with ±10% tolerance. |
| Isolated feedback support via CFB and COMP | Allows secondary-side error amplification with opto-coupler - maintains tight output regulation across line, load, and temperature without primary-side sensing compromises. |
| Hardware-enforced <50% max duty cycle | Guarantees transformer reset in two-switch forward topology - prevents core saturation and enables reliable operation without tertiary winding or complex reset circuitry. |
| Thermal shutdown with 25°C hysteresis | Protects device under sustained overload or inadequate cooling - automatically recovers after die cools below 140°C, avoiding manual reset or system interruption. |
Applications
| Industrial Power Supply | Telecom Rectifier Module |
|---|---|
Use Scenario: 48V input DC-DC converter powering 12V/5V rails in PLC controllers and motor drives. IC Role / Device Role / Timing Role: Primary-side controller implementing two-switch forward topology with integrated MOSFETs and isolated feedback. Use Value: Enables compact, efficient, and reliable conversion from wide-input industrial bus without external HV switches or complex transformer reset circuitry. |
Use Scenario: -48V telecom rectifier supplying +3.3V/5V to base station radios and backhaul equipment. IC Role / Device Role / Timing Role: High-voltage regulator managing input transients and delivering tightly regulated outputs via opto-coupled secondary feedback. Use Value: Supports direct -48V operation with robust UVLO, thermal protection, and 1.26V reference accuracy - critical for uptime-sensitive telecom infrastructure. |
| Distributed Power Architecture | High-Voltage Battery System |
Use Scenario: Intermediate bus converter stepping down 60V battery pack voltage to 12V for subsystem distribution in EV charging stations. IC Role / Device Role / Timing Role: Two-switch flyback controller providing galvanic isolation and precise output regulation across variable input conditions. Use Value: Leverages ultra-wide input range and integrated MOSFETs to simplify design, reduce footprint, and improve reliability versus discrete solutions. |
Use Scenario: Onboard charger auxiliary supply converting 72V traction battery voltage to 5V for microcontroller and sensor power. IC Role / Device Role / Timing Role: High-efficiency isolated DC-DC controller with programmable soft-start and enable sequencing for safe system boot. Use Value: Delivers stable 5V output with <170 µA shutdown current and thermal recovery - extends standby time and ensures fail-safe operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage two-switch forward regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28911DR | Primary-side controlled flyback controller with integrated 700V MOSFET; no secondary-side feedback required; fixed 70 kHz frequency. | Targets lower-power (<15W), cost-sensitive isolated flyback designs - lacks two-switch forward capability and programmable frequency. | Choose UCC28911DR for simpler, lower-cost flyback systems where input is ≤700V AC/DC and output power is modest. |
| LM5025CMTC/NOPB | Two-switch forward controller without integrated MOSFETs; requires external 100V+ FETs; supports up to 1 MHz; includes dead-time control and slope compensation. | Suitable for higher-power (>100W), custom-layout designs requiring discrete FET selection, tighter dead-time tuning, and advanced protection features. | Choose LM5025CMTC/NOPB when designing >75W converters needing flexible FET selection, higher frequency, or enhanced fault diagnostics beyond LM5015MH/NOPB's integrated scope. |
Compared with UCC28911DR and LM5025CMTC/NOPB, LM5015MH/NOPB uniquely combines integrated 75V MOSFETs, programmable frequency up to 750 kHz, and native two-switch forward/flyback support in a single HTSSOP-14EP package - offering optimal balance of integration, thermal performance, and design simplicity for 10–75W industrial and telecom applications.
Availability
LM5015MH/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifiers, and distributed power architectures requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5015MH/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5015MH/NOPB belongs to TI's high-voltage DC-DC controller product line, designed specifically for isolated two-switch forward and flyback topologies in industrial, telecom, and automotive auxiliary power applications.
FAQ
What is the maximum input voltage rating for the LM5015MH/NOPB?
The LM5015MH/NOPB has an absolute maximum input voltage rating of 76V across VIN and PVIN pins. Its recommended operating input range is 4.25V to 75V. Exceeding 76V - even transiently due to ringing - risks permanent damage. Proper input filtering, localized decoupling capacitors at VIN–AGND and PVIN–PGND, and careful PCB layout are essential to maintain safe operation within this limit.
Can the LM5015MH/NOPB be used in non-isolated buck-derived topologies?
Yes, the LM5015MH/NOPB supports non-isolated two-switch forward configurations where the output shares a common ground with the input. In such cases, the FB pin connects directly to the output divider, COMP drives a Type II compensation network, and CFB remains unconnected. The internal 1.26V reference and current-mode control ensure stable regulation without opto-couplers or secondary-side circuitry.
How does the LM5015MH/NOPB handle thermal overload conditions?
The LM5015MH/NOPB incorporates thermal shutdown circuitry that disables all switching functions when junction temperature reaches 165°C. It remains latched in low-power standby mode until the die cools by approximately 25°C (to ~140°C), at which point normal operation resumes automatically. This behavior is confirmed in the Electrical Characteristics table and functional description of the LM5015MH/NOPB datasheet.
What is the purpose of the CFB pin on the LM5015MH/NOPB?
The CFB (Current Feedback) pin on the LM5015MH/NOPB provides a high-bandwidth path for secondary-side error amplifier output to modulate the PWM comparator. It accepts current from an opto-coupler's transistor collector, enabling fast transient response in isolated designs while maintaining constant opto-coupler voltage - improving regulation accuracy over traditional voltage-mode feedback approaches.
Does the LM5015MH/NOPB require external bootstrap components?
Yes, the LM5015MH/NOPB requires an external bootstrap capacitor between BST and HO pins. A minimum 0.022 µF ceramic capacitor is specified, placed as close as possible to those pins. This capacitor supplies gate drive energy to the high-side MOSFET during its on-time and is recharged via the internal bootstrap diode from VCC during the low-side conduction phase.
LM5015MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.25V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1.26V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 1A
- Frequency - Switching:
- 25kHz ~ 750kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM5015MH/NOPB FAQ
1.How can I place an order for LM5015MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5015MH/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 LM5015MH/NOPB reliable?
The price and inventory of LM5015MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5015MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM5015MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5015MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5015MH/NOPB?
LM5015MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5015MH/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 LM5015MH/NOPB?
For technical support, including LM5015MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5015MH/NOPB requirements.
6.How does Aetrix verify that LM5015MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5015MH/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 LM5015MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM5015MH/NOPB?
All LM5015MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5015MH/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 LM5015MH/NOPB part is unused and in its original packaging.
Return procedure for LM5015MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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