Summary of 65V INPUT -12VDC OUTPUT 1A SYNCHRONOUS BUCK DC/DC CONVERTER USING LM5164
This project is a 15–65 V input step-down synchronous buck converter using the LM5164 to deliver a regulated 12 V at 1 A, 300 kHz, with features like precision enable, input UVLO, internal soft-start (3 ms), diode emulation, ultra-low IQ, and integrated MOSFETs. It targets high-cell-count battery packs, power/garden tools, e-scooters, and drones, offers 90% full-load efficiency at 48 V in, and uses a power LED and 4-pin male headers for input/output.
Parts used in the 65V INPUT -12VDC OUTPUT 1A SYNCHRONOUS BUCK DC/DC CONVERTER USING LM5164:
- LM5164 synchronous buck converter IC
- Resistor R4 (sets switching frequency to 300 kHz)
- Power LED (D1)
- 4-pin male header connectors for input and output
- Input and output capacitors (unspecified values in article)
- Inductor for buck converter (unspecified value in article)
- Schottky or synchronous MOSFETs integrated in LM5164
- Bootstrap diode (integrated in LM5164)
- VCC bias components (external support components as required)
- PCB and supporting passive components for UVLO, enable, and protection (unspecified)
This is a step-down DC-DC converter mainly designed for application such as high-cell-count battery packs, power tools, garden tools and electric scooters, drones. Some of the features of the project is precision enable, input voltage UVLO, internal soft start etc. The project operates over wide input voltage range of 15V to 65V to provide a regulated 12V-1A output at 300Khz working frequency. D1 is the power LED, and 4 Pin male header connectors provided for input and output. The full-load efficiency of the project is 90% @ nominal input voltage of 48 V and an output voltage of 12 V. The switching frequency is set by resistor R4 at 300 kHz. The output voltage soft-start time is 3 msec.
6-V TO 100-V INPUT, 1-A SYNCHRONOUS BUCK DC-DC CONVERTER WITH ULTRA-LOW IQ
The LM5164 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. A minimum controllable on-time of 50 ns facilitates large step-down conversion ratios, enabling the direct step-down from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5164 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for wide input supply range industrial and high cell count battery pack applications. With integrated high-side and low-side power MOSFETs, the LM5164 delivers up to 1-A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. Additional features of the LM5164 include ultra-low IQ and diode emulation mode operation for high light-load efficiency, innovative peak and valley overcurrent protection, integrated VCC bias supply and bootstrap diode, precision enable and input UVLO, and thermal shutdown protection with automatic recovery. An open-drain PGOOD indicator provides sequencing, fault reporting, and output voltage monitoring.
Read more: 65V INPUT -12VDC OUTPUT 1A SYNCHRONOUS BUCK DC/DC CONVERTER USING LM5164
- What input voltage range does the converter support?
The project operates over a wide input voltage range of 15 V to 65 V and the LM5164 can regulate from 6 V to 100 V in general operation. - What is the output voltage and current capability?
It provides a regulated 12 V output at up to 1 A. - What switching frequency is used?
The switching frequency is set to 300 kHz by resistor R4. - How long is the output soft-start time?
The output voltage soft-start time is 3 msec. - What efficiency can be expected at full load?
The full-load efficiency is 90% at a nominal input voltage of 48 V and 12 V output. - Does the design include a power LED indicator?
Yes, D1 is the power LED in the project. - Are the power MOSFETs external or integrated?
The high-side and low-side power MOSFETs are integrated in the LM5164. - Does the LM5164 provide protection features?
Yes, it includes input UVLO, precision enable, thermal shutdown with automatic recovery, and peak and valley overcurrent protection. - Can the converter operate during input voltage dips?
Yes, the LM5164 can operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed.
