My Inquiry
My Account
Texas Instruments LM5015MHX/NOPB
- Part No.:
- LM5015MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5015MHX/NOPB.pdf
- Description:
- IC REG FLYBACK ADJ 1A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5015MHX/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 50% maximum duty cycle limit for transformer reset compliance.
For engineers reviewing the LM5015MHX/NOPB datasheet, LM5015MHX/NOPB pinout, LM5015MHX/NOPB application, or LM5015MHX/NOPB equivalent, key selection considerations include its integrated dual-MOSFET architecture, HTSSOP-14EP thermal performance, isolated feedback interface via COMP/CFB pins, and programmable soft-start using external capacitor on SS pin.
Technical Context
The LM5015MHX/NOPB employs peak current-mode control with leading-edge blanking and cycle-by-cycle current limiting at 1.2A typical. Its oscillator supports single-resistor programming (25 kHz–750 kHz) and external synchronization via RT pin with ≥3.2V sync threshold and ≥15 ns pulse width.
It features dual independent power inputs: VIN powers internal control blocks and VCC LDO (regulated to 6.9V above 6.9V input), while PVIN directly connects to the high-side MOSFET drain. The internal 42 mΩ current sense resistor and 30× gain amplifier deliver 1.25V/A sensing for precise current limiting.
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 battery systems without pre-regulation. |
| Feedback Reference Voltage | 1.26V ±1.5% - provides stable output regulation across −40°C to +125°C junction temperature range. |
| Switching Frequency | 200 kHz typical (RRT = 31.6 kΩ) - balances efficiency, magnetics size, and EMI in isolated forward converters. |
| Max Duty Cycle Limit | 49% - ensures reliable transformer reset in two-switch forward topology by enforcing <50% conduction window. |
| Current Limit Threshold | 1.2A typical 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 during sustained overloads or poor heatsinking conditions. |
| VCC Regulator Output | 6.9V regulated (for VIN > 6.9V) - powers internal circuitry while minimizing dissipation when main input exceeds bias requirement. |
Pinout & Package
LM5015MHX/NOPB is housed in an HTSSOP-14EP package with exposed thermal pad (EP), optimized for high-power density and thermal dissipation in isolated DC-DC applications. The exposed pad must be soldered to PCB ground plane and connected to AGND/PGND for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND | Analog ground reference | Internal reference for error amplifier and PWM comparator; must be low-impedance connection to minimize noise coupling into control loop. |
| RT | Oscillator programming & sync input | Resistor-to-AGND sets frequency; accepts external sync pulses ≥3.2V with ≥15 ns width for synchronized multi-phase operation. |
| FB | Non-isolated feedback input | Connects to inverting input of internal error amplifier; used only in non-isolated configurations; tied to AGND in isolated designs. |
| COMP | Error amplifier output / opto-coupler drive | Open-drain output with 5 kΩ internal pull-up; drives opto-coupler LED in isolated topologies; requires external compensation network. |
| CFB | Isolated current feedback input | Accepts NPN current mirror output from opto-coupler; enables high-bandwidth secondary-side regulation without compromising isolation integrity. |
| PGND | Power ground return | Internally tied to source of low-side MOSFET and current sense resistor; must be separate low-impedance path from AGND to avoid noise injection. |
| LO | Low-side MOSFET drain | Output switch node for low-side N-channel MOSFET; connects to transformer primary center-tap or flyback winding in two-switch topologies. |
| PVIN | High-side MOSFET drain supply | Direct connection to input bus; carries full input current during high-side conduction; requires local high-frequency decoupling to PGND. |
| HO | High-side MOSFET source | Switching node for high-side N-channel MOSFET; referenced to BST voltage; forms bootstrap gate drive loop with BST capacitor. |
| BST | Bootstrap capacitor connection | Requires ≥0.022 µF ceramic capacitor to HO; charges via internal diode during LO conduction to sustain high-side gate drive. |
| VCC | Bias regulator output or auxiliary input | Provides 6.9V regulated supply; can accept external 7–14V bias to reduce internal dissipation and improve efficiency at high VIN. |
| VIN | Analog control supply input | Powers internal LDO and logic; operates from 4.25V–75V; decoupled separately from PVIN to suppress noise coupling into control circuitry. |
| EN | Enable / UVLO input | Dual-threshold enable: 0.45V shutdown, 1.26V standby; internal 6 µA pull-up allows simple resistor-divider UVLO setting from VIN. |
| SS | Soft-start timing capacitor | 11 µA internal current source charges external capacitor to ramp COMP voltage linearly, preventing inrush current and output overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Dual integrated 75V N-channel MOSFETs | Eliminates need for external high-voltage switches; reduces BOM count and layout complexity in two-switch forward/flyback designs. |
| Ultra-wide 4.25V–75V input range | Supports direct integration into 48V telecom, 60V industrial, and battery-backed systems without front-end pre-regulators. |
| Integrated high-voltage bias regulator | Enables self-powered operation down to 4.25V input; external VCC bias option improves efficiency at high input voltages. |
| Isolated feedback interface (COMP/CFB) | Allows secondary-side error amplification with opto-coupler; maintains safety isolation while enabling tight output regulation. |
| Programmable soft-start via SS pin | Prevents transformer saturation and output overshoot during startup; eliminates need for external timing components beyond capacitor. |
| Thermal shutdown with 25°C hysteresis | Protects device under sustained overload or inadequate heatsinking; automatic recovery after die cools below 140°C. |
Applications
| Industrial Power Supply | Telecom Rectifier Module |
|---|---|
|
Use Scenario: 48V input to 12V/5V isolated output in DIN-rail mounted PLC power modules requiring high reliability and wide input range. IC Role / Device Role / Timing Role: Primary-side controller implementing two-switch forward topology with integrated MOSFETs and transformer reset management. Use Value: Reduces component count by eliminating discrete high-voltage switches and external bias regulators while maintaining 165°C thermal protection. |
Use Scenario: AC/DC front-end rectifier feeding distributed 48V bus in telecom base stations with strict efficiency and transient response requirements. IC Role / Device Role / Timing Role: High-efficiency isolated DC-DC stage converting 48V bus to intermediate 12V rails for downstream POL converters. Use Value: Enables 200 kHz operation with minimal magnetics size and supports synchronization to system clock for EMI reduction. |
| Medical Isolated Auxiliary Supply | Railway Onboard Converter |
|
Use Scenario: Safety-isolated 24V-to-5V/3.3V supply for microcontroller and sensor interfaces in Class II medical equipment. IC Role / Device Role / Timing Role: Isolated flyback controller using COMP-driven opto-coupler feedback for reinforced insulation compliance. Use Value: Meets IEC 60601 creepage/clearance requirements via galvanic isolation and provides 1.26V reference accuracy for stable diagnostics power. |
Use Scenario: 72V nominal traction battery input to 24V isolated control rail in train onboard systems operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust two-switch forward controller with extended temperature rating and 75V absolute max input tolerance. Use Value: Survives 100V load-dump transients due to 76V absolute max ratings on VIN/PVIN and built-in cycle-by-cycle current limiting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage isolated DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2897A | External MOSFET driver; no integrated power switches; supports up to 1 MHz switching; requires external current sense. | Used in higher-power (>200W) or higher-frequency designs where discrete MOSFETs offer better thermal management. | Select UCC2897A when higher efficiency at >300 kHz or discrete FET optimization is required; LM5015MHX/NOPB preferred for compact <100W isolated supplies. |
| LM5025C | Single-ended active clamp forward controller; integrates 100V MOSFET drivers but no power FETs; includes active clamp timing control. | Targets active clamp forward topologies for zero-voltage switching; lacks integrated switches and isolated CFB pin. | Choose LM5025C for ZVS-enabled forward converters needing reduced switching loss; LM5015MHX/NOPB suits standard two-switch forward with lower BOM cost. |
Compared with UCC2897A and LM5025C, the LM5015MHX/NOPB uniquely combines dual 75V MOSFET integration, isolated CFB feedback, and HTSSOP-14EP thermal packaging-enabling simpler, smaller, and more robust two-switch forward/flyback designs below 100W.
Availability
LM5015MHX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and railway onboard converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM5015MHX/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 over 50 years of innovation in high-reliability power conversion solutions.
The LM5015MHX/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 transportation applications demanding wide input range and integrated power switches.
FAQ
What is the maximum recommended switching frequency for LM5015MHX/NOPB?
The LM5015MHX/NOPB supports up to 750 kHz switching frequency via RT resistor programming. However, the recommended maximum for stable operation with integrated MOSFETs is 500 kHz. At higher frequencies, gate drive losses increase and thermal performance degrades due to limited heat dissipation in the HTSSOP-14EP package. Always verify thermal margin using θJA = 40°C/W and measured power loss in final layout.
Can LM5015MHX/NOPB operate with an external 12V bias applied to the VCC pin?
Yes, LM5015MHX/NOPB accepts an external 7–14V bias on the VCC pin to disable the internal LDO and reduce power dissipation. When 12V is applied, the internal VCC regulator shuts off, lowering total IC power loss and improving converter efficiency-especially at high VIN. Ensure the external VCC never exceeds VIN to prevent forward-biasing the internal body diode between VCC and VIN.
How does the CFB pin function in an isolated LM5015MHX/NOPB design?
In isolated configurations, the CFB pin receives current from an NPN current mirror driven by an opto-coupler's phototransistor. This provides high-bandwidth feedback without loading the opto-coupler's collector, maintaining stable regulation across line/load transients. The LM5015MHX/NOPB's CFB circuitry holds opto-coupler voltage relatively constant, reducing transfer ratio variation and improving dynamic response versus standard COMP-only schemes.
What is the purpose of the 50% maximum duty cycle limit in LM5015MHX/NOPB?
The 49% maximum duty cycle in LM5015MHX/NOPB ensures reliable magnetic reset in two-switch forward topologies. By limiting conduction time, it guarantees sufficient off-time for the transformer core to demagnetize before the next cycle-preventing saturation, excessive current stress, and potential failure. This hard limit is implemented via oscillator divide-by-two logic plus 50 ns forced off-time, making it intrinsic to the IC's architecture.
Does LM5015MHX/NOPB require separate decoupling for VIN and PVIN pins?
Yes, LM5015MHX/NOPB requires separate high-frequency decoupling: a 0.1 µF ceramic capacitor between VIN and AGND, and another between PVIN and PGND. This separation prevents switching noise from the power path (PVIN/PGND) from coupling into sensitive analog control circuitry (VIN/AGND), which could cause erratic regulation or false current-limit triggering. Layout best practice places both capacitors within 2 mm of their respective pins.
LM5015MHX/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
LM5015MHX/NOPB FAQ
1.How can I place an order for LM5015MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5015MHX/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 LM5015MHX/NOPB reliable?
The price and inventory of LM5015MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5015MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5015MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5015MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5015MHX/NOPB?
LM5015MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5015MHX/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 LM5015MHX/NOPB?
For technical support, including LM5015MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5015MHX/NOPB requirements.
6.How does Aetrix verify that LM5015MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5015MHX/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 LM5015MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5015MHX/NOPB?
All LM5015MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5015MHX/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 LM5015MHX/NOPB part is unused and in its original packaging.
Return procedure for LM5015MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5015MHX/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
