company blog about Mingjiada Electronics Supplies LM34927 in Large Quantities — A High-Voltage Bias Regulator Suitable for Isolated DC/DC Converters

Mingjiada Electronics offers the LM34927 in stock – a high-voltage bias regulator suitable for isolated DC/DC converters

Product Overview

The LM34927 is a high-voltage integrated secondary-side bias regulator from Texas Instruments, designed specifically for isolated DC/DC converters. This device integrates all the functionality required to realise a low-cost, high-efficiency isolated bias regulator, featuring two built-in 100V N-channel MOSFET switches—a high-side buck switch and a low-side synchronous switch. The LM34927 employs a Constant On-Time (COT) control scheme, delivering excellent transient response without the need for loop compensation.

Shenzhen Mingjiada Electronics Co., Ltd., as a specialist supplier of electronic components from stock, has long supplied the LM34927 series in large quantities. We stock the LM34927SD model; these are genuine, original products with ample stock available. We welcome enquiries and orders from both new and existing customers.

Product Specifications

Brand: Texas Instruments

Input voltage range: 7.5V to 100V

Output current: 600mA

Output voltage: Adjustable, starting from 1.225V

Feedback reference accuracy: 2%

Switching frequency: Adjustable up to 1MHz

Quiescent current: 1.75mA

Topology: Buck (Step-down)

Synchronous rectification: Yes

Operating temperature: –40°C to +125°C

Maximum junction temperature: 150°C

Package type: SO PowerPAD-8 (DDA), WSON-8 (NGU)

Absolute Maximum Ratings:

VIN, UVLO to RTN: –0.3V to 100V

SW to RTN: –0.3 V to VIN + 0.3 V

BST to SW: 13 V

VCC to RTN: –0.3 V to 13 V

Storage temperature range: –55 °C to 150 °C

ESD Ratings:

Human Body Model (HBM): ±2000V

Charged Device Model (CDM): ±750V

Key Features

1. Ultra-wide input voltage range

The LM34927 supports a wide input voltage range of 7.5V to 100V, making it suitable for a variety of high-voltage applications, particularly industrial and automotive electronic systems where input voltage fluctuations are significant.

2. Integrated 600mA high-side and low-side switches

The device incorporates two 100V N-channel MOSFETs internally, eliminating the need for external power transistors, thereby simplifying circuit design and reducing PCB footprint.

3. No Schottky diodes required

Thanks to its synchronous rectification architecture, the LM34927 achieves high-efficiency step-down conversion without the need for external Schottky diodes, further reducing BOM costs.

4. Constant On-Time (COT) Control

The constant on-time control scheme eliminates the need for loop compensation, simplifying the design process whilst providing ultra-fast transient response.

5. Near-Constant Operating Frequency

The device’s on-time is inversely proportional to the input voltage, keeping the operating frequency relatively constant across the entire input voltage range, which facilitates filtering and EMI design.

6. Intelligent Peak Current Limitation

Intelligent peak current limitation is achieved via an integrated sensing circuit, effectively protecting the device and the load from damage caused by abnormal currents.

7. Adjustable Output Voltage

The output voltage is adjustable with a reference voltage of 1.225 V; combined with a feedback reference offering 2 per cent accuracy, this meets a wide range of output voltage requirements.

8. Comprehensive Protection Features

Programmable input under-voltage lock-out (UVLO) to prevent operation under low-voltage conditions

Thermal shutdown protection to prevent damage due to overheating

VCC under-voltage lock-out (UVLO)

Remote shutdown function

9. Flexible Packaging Options

Available in two plastic packages: 8-pin SO PowerPAD and 8-pin WSON, to accommodate different PCB layout requirements.

Application Areas

The LM34927 is specifically designed for isolated DC/DC converter applications and is widely used in the following areas:

Isolated Telecommunications Bias Power Supplies

In telecommunications infrastructure, the LM34927 can be used to provide a stable secondary-side bias voltage for isolated DC/DC converters, meeting the requirements of communications equipment for high reliability and a wide input voltage range.

Isolated Automotive Electronics

Suitable for automotive electronic applications such as on-board chargers, battery management systems (BMS) and DC/DC converters for new energy vehicles, its wide input voltage range and operating temperature range of –40°C to +125°C fully meet the requirements of automotive-grade applications.

Isolated Industrial Electronics

In industrial applications such as industrial control, PLCs, factory automation and motor drives, the LM34927 serves as an ideal choice for isolated bias power supplies, providing a stable and reliable power supply solution.

Other Typical Applications

Isolated Fly-Buck Converters

Auxiliary Power Supplies for Solar Inverters

Industrial Power Modules

Test and Measurement Equipment

Mingjiada Electronics – LM34927 Stock Supplier

Shenzhen Mingjiada Electronics Co., Ltd. has long specialised in supplying Texas Instruments (TI) LM34927 series isolated bias regulators. Product features are as follows:

Genuine Products: All LM34927 products are genuine Texas Instruments items, with quality guaranteed

Stock Availability: We maintain substantial stock levels at all times, with 2,500 units of the LM34927SD model in stock to meet procurement needs of all sizes

Brand-New Stock: Products are from the latest production year (22+), ensuring device performance and reliability

Fast Delivery: Available from stock, eliminating long waiting times and enabling rapid dispatch

For LM34927 samples, quotations or further product information, please contact Shenzhen Mingjiada Electronics Co., Ltd.

Why choose the LM34927?

As a classic high-voltage bias regulator from Texas Instruments, the LM34927 has become the preferred solution for isolated DC/DC converter bias power supply designs, thanks to its ultra-wide input voltage range of 7.5V to 100V, 600mA output capability, loop-compensation-free COT control architecture, and comprehensive protection features. Whether for telecommunications base stations, automotive electronics or industrial control systems, the LM34927 provides a low-cost, high-efficiency isolated bias voltage regulator solution.

As a specialist supplier of LM34927 in stock, Mingjiada Electronics is committed to providing customers with high-quality products and convenient procurement services. We welcome engineers and procurement professionals to contact us for enquiries!

Tags: LM34927SD, LM34927S, LM34927