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Texas Instruments LM5015MHE/NOPB
- Part No.:
- LM5015MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5015MHE/NOPB.pdf
- Description:
- IC REG FLYBACK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:474
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Product details
Overview
LM5015MHE/NOPB from Texas Instruments is a high-voltage monolithic two-switch forward DC-DC regulator IC integrating dual 75V N-channel MOSFETs, supporting 4.25V–75V input and delivering isolated output in industrial power supplies. It implements current-mode control with 1.26V feedback reference accuracy, 200 kHz typical switching frequency, and 1.2A cycle-by-cycle current limit for robust overcurrent protection in telecom rectifiers and distributed power architectures.
For engineers reviewing the LM5015MHE/NOPB datasheet, LM5015MHE/NOPB pinout, LM5015MHE/NOPB application, or LM5015MHE/NOPB equivalent, key selection considerations include its HTSSOP-14EP package thermal performance, dual-input bias architecture (VIN/PVIN), isolated feedback interface via COMP/CFB pins, and strict <50% maximum duty cycle enforcement for transformer reset compliance in two-switch forward topologies.
Technical Context
The LM5015MHE/NOPB employs peak current-mode control with leading-edge blanking and a dedicated 42 mΩ internal current-sense resistor on the low-side MOSFET source. Its oscillator supports single-resistor programming (25–750 kHz) and external synchronization via the RT pin with 3.2V threshold and 15 ns minimum pulse width.
It features dual-input power architecture: VIN powers the internal 6.9V LDO bias regulator (4.25–75V range), while PVIN connects directly to the high-side MOSFET drain. Thermal shutdown activates at 165°C with 25°C hysteresis, and EN provides dual-threshold enable/standby control (0.45V shutdown, 1.26V operation).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.25V to 75V - supports wide-range industrial and telecom inputs without external pre-regulation |
| Feedback Reference Voltage | 1.26V ±1.5% - enables precise output regulation with minimal external divider error contribution |
| Switching Frequency | 200 kHz typical (RRT = 31.6 kΩ) - balances efficiency, magnetics size, and EMI in medium-power converters |
| Current Limit Threshold | 1.2A cycle-by-cycle - protects internal MOSFETs and external magnetics during overload or short-circuit events |
| Max Duty Cycle | 49% - ensures reliable transformer reset in two-switch forward topology, preventing core saturation |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent junction damage and enables safe auto-recovery after cooling |
| MOSFET RDS(on) | 0.45 Ω (high-side) / 0.49 Ω (low-side) at TJ = 25°C - determines conduction loss and thermal design margin |
Pinout & Package
LM5015MHE/NOPB is housed in an HTSSOP-14EP package with exposed die attach pad (EP) connected to PGND/AGND for enhanced thermal dissipation (θJA = 40°C/W, θJC = 6.6°C/W). The 14-pin layout supports high-voltage isolation, bootstrap gate drive, and dual feedback paths for non-isolated and opto-coupled designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AGND | Analog ground reference | Internal reference for error amplifier and PWM comparator; must be star-connected to PGND to minimize noise coupling |
| 2 RT | Oscillator programming & sync input | Resistor-to-AGND sets frequency; accepts external sync pulses >3.2V with 15 ns min width for master-slave operation |
| 3 FB | Non-isolated feedback input | Connects to inverting input of internal error amp; used only in non-isolated configurations (FB tied to AGND in isolated) |
| 4 COMP | Error amplifier output | Open-drain output drives opto-coupler LED in isolated designs; internal 5 kΩ pull-up enables direct opto biasing |
| 5 CFB | Isolated current feedback | Accepts NPN current mirror output from opto-coupler; maintains stable opto voltage while enabling high-bandwidth loop response |
| 6 PGND | Power ground return | Internally tied to low-side MOSFET source and current sense resistor; requires low-inductance PCB connection to input capacitor |
| 7 LO | Low-side MOSFET drain | Switching node for low-side FET; connects to transformer primary center-tap or flyback winding in two-switch topologies |
| 8 PVIN | High-side MOSFET drain supply | Direct connection to main input rail; separates high-current path from analog VIN supply to reduce noise coupling |
| 9 HO | High-side MOSFET source | Bootstrap-referenced switching node; requires external BST capacitor (≥0.022 µF) between HO and BST pins |
| 10 BST | Bootstrap capacitor terminal | Charged from VCC during LO conduction; sustains gate drive for high-side FET during its on-time |
| 11 VCC | Bias regulator output/input | Outputs regulated 6.9V (for VIN ≤6.9V) or tracks VIN (for VIN <6.9V); accepts external 7–14V supply to reduce dissipation |
| 12 VIN | Analog control supply | Powers internal logic, LDO, and gate drivers; decoupled with ≥0.47 µF ceramic cap; independent from PVIN for layout flexibility |
| 13 EN | Enable / UVLO input | 6 µA internal pull-up enables default operation; external divider sets input UVLO threshold (1.26V activation) |
| 14 SS | Soft-start timing | 11 µA internal current source charges external capacitor to ramp COMP voltage and limit inrush current |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane and connected to AGND/PGND for optimal thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Dual integrated 75V N-channel MOSFETs | Eliminates external high-voltage switches and associated gate-drive complexity in two-switch forward/flyback designs |
| Ultra-wide 4.25V–75V input range | Supports direct connection to 48V telecom, 60V industrial, and 72V battery systems without pre-regulator stage |
| Isolated feedback interface (COMP + CFB) | Enables stable closed-loop regulation across transformer barrier using opto-coupler with minimal phase lag |
| Programmable soft-start (SS pin) | Prevents output overshoot and inrush current by linearly ramping COMP voltage via external capacitor |
| Thermal shutdown with hysteresis | Guarantees safe recovery after overheating events without requiring external thermal management circuitry |
| Oscillator synchronization capability | Allows multiple LM5015MHE/NOPB units to operate at same frequency and phase, reducing system-level EMI peaks |
Applications
| Telecom Rectifier Modules | Industrial AC/DC Power Supplies |
|---|---|
|
Use Scenario: 48V input telecom rectifier converting to 12V/5V isolated outputs for base station equipment. IC Role / Device Role / Timing Role: Primary-side controller implementing two-switch forward topology with transformer isolation and synchronous rectification support. Use Value: Dual 75V MOSFETs withstand 48V nominal + line transients; 1.26V reference enables ±1% output tolerance under load/line variation. |
Use Scenario: DIN-rail mounted 24V/48V input power supply for PLCs and I/O modules in factory automation. IC Role / Device Role / Timing Role: High-voltage DC-DC controller managing isolated 5V/3.3V rails with reinforced insulation per IEC 61800-5-1. Use Value: HTSSOP-14EP package with exposed pad meets thermal requirements at full load; EN pin enables remote ON/OFF control. |
| Server Auxiliary Power Supplies | EV On-Board Charger Stages |
|
Use Scenario: Isolated 12V standby rail generation from 380V DC bus in server PSUs using two-switch flyback configuration. IC Role / Device Role / Timing Role: Two-switch flyback controller with CFB pin enabling fast transient response for dynamic CPU load changes. Use Value: 75V MOSFET rating allows safe operation at 380V bus with snubber margin; 200 kHz switching reduces transformer size vs. 100 kHz alternatives. |
Use Scenario: High-voltage DC-DC stage in bi-directional OBC converting 400V battery to 12V/48V auxiliary systems. IC Role / Device Role / Timing Role: Primary-side regulator in isolated DC-DC converter handling bidirectional power flow with fault monitoring. Use Value: Cycle-by-cycle current limiting (1.2A) protects against short-circuit faults during reverse power transfer; thermal shutdown prevents latch-up during overtemperature. |
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 | Single-switch flyback controller with integrated 700V MOSFET; no dual-MOSFET or two-switch forward support | Lower BOM count for low-power (<15W) isolated supplies; lacks transformer reset control for forward topologies | Select UCC28911DR only for cost-sensitive, low-power flyback designs where two-switch forward efficiency and power density are not required |
| LM5165QDGSRQ1 | 65V buck regulator with integrated 0.5A MOSFET; no isolation capability or high-side switch | Non-isolated point-of-load conversion; unsuitable for transformer-based topologies or >65V input | Choose LM5165QDGSRQ1 for automotive 12V/24V systems needing compact, low-noise buck regulation-not for isolated HV DC-DC |
Compared with UCC28911DR and LM5165QDGSRQ1, LM5015MHE/NOPB uniquely delivers dual 75V MOSFETs, two-switch forward/flyback topology support, and isolated feedback interfaces-making it the only option among the three capable of >30W isolated conversion with transformer reset assurance and wide 4.25V–75V input operation.
Availability
LM5015MHE/NOPB is available at Aetrix Electronics and suitable for telecom rectifiers, industrial AC/DC power supplies, and EV on-board charger stages requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5015MHE/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 LM5015MHE/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 where input voltage exceeds 40V and transformer isolation is mandatory.
FAQ
What is the maximum recommended switching frequency for LM5015MHE/NOPB?
The LM5015MHE/NOPB supports up to 750 kHz switching frequency via the RT resistor, but 200–400 kHz is recommended for optimal efficiency and thermal performance. At 750 kHz, gate charge losses increase significantly, and PCB layout becomes more sensitive to parasitic inductance-especially critical for the BST/HO loop. The datasheet specifies 200 kHz as typical with RRT = 31.6 kΩ, and 405 kHz with RRT = 15.4 kΩ.
Can LM5015MHE/NOPB operate with separate VIN and PVIN supplies?
Yes, LM5015MHE/NOPB is explicitly designed for independent VIN and PVIN operation. VIN powers the analog control blocks and VCC LDO (4.25–75V range), while PVIN connects directly to the high-side MOSFET drain. This separation allows use of a low-voltage auxiliary supply (e.g., 12V) on VIN to reduce internal power dissipation when PVIN is at 48V or higher-improving overall efficiency in high-input-voltage applications.
How does the CFB pin function in isolated feedback designs with LM5015MHE/NOPB?
In isolated designs, the CFB pin accepts current from an NPN current mirror driven by an opto-coupler's phototransistor collector. Unlike the COMP pin-which sinks current-the CFB pin provides high-bandwidth current-mode feedback by mirroring opto output while maintaining constant opto voltage, minimizing phase lag and improving transient response. This architecture avoids stability compromises common in voltage-mode opto interfaces.
What is the purpose of the 50% maximum duty cycle limit in LM5015MHE/NOPB?
The LM5015MHE/NOPB enforces a hard 49% maximum duty cycle to guarantee reliable transformer reset in two-switch forward topologies. Exceeding this limit risks incomplete magnetic flux reset during the off-time, leading to core saturation, MOSFET failure, and loss of regulation. The limit is implemented via oscillator divide-by-two logic plus 50 ns forced off-time, making it intrinsic to the IC-not configurable via external components.
Does LM5015MHE/NOPB require an external bootstrap capacitor, and what is its minimum value?
Yes, LM5015MHE/NOPB requires an external ceramic capacitor between BST and HO pins to sustain high-side gate drive. The datasheet specifies a minimum value of 0.022 µF, placed as close as possible to the BST/HO pins with short, low-inductance traces. This capacitor is charged from VCC during the low-side conduction period and must maintain sufficient voltage (>5V) across HO–BST to fully enhance the high-side MOSFET throughout its on-time.
LM5015MHE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM5015MHE/NOPB FAQ
1.How can I place an order for LM5015MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5015MHE/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 LM5015MHE/NOPB reliable?
The price and inventory of LM5015MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5015MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM5015MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5015MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5015MHE/NOPB?
LM5015MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5015MHE/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 LM5015MHE/NOPB?
For technical support, including LM5015MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5015MHE/NOPB requirements.
6.How does Aetrix verify that LM5015MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5015MHE/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 LM5015MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM5015MHE/NOPB?
All LM5015MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5015MHE/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 LM5015MHE/NOPB part is unused and in its original packaging.
Return procedure for LM5015MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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