Calculation tool
LM5171-CALC — LM5171-Q1 Quickstart Calculator
LM5171-Q1 Quickstart Calculator helps on design of the power stage, current loop and voltage loop. Component calculations for the controller are also included.
Data sheet
LM5171-Q1
- AEC-Q100 qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient operating range
- Device HBM ESD classification level 2
- Device CDM ESD classification level C4B
- Functional Safety-Capable
- 85-V HV-port and 80-V LV-port max ratings
- 1% Typical Accuracy of bidirectional current regulation
- 1% Typical Accuracy of channel current monitoring
- I 2C Interface for monitoring and diagnosis
- Built-in 3.5V 1% reference voltage
- Integrated 5V 10mA bias supply
- 5-A Peak half-bridge gate drivers
- Programmable or adaptive dead-time control
- Programmable oscillator frequency up to 1MHz with optional synchronization to external clock
- Independent channel enabling control inputs
- Integrated both current and voltage loop control
- Programmable cycle-by-cycle peak current limit
- Over-temperature shutdown
- HV and LV port overvoltage protection
- Dynamically selectable diode emulation and forced PWM operation modes
- Programmable soft-start timer
- Support both multiphase and independent channel operations
- Support urgent shutdown latch
The LM5171-Q1 controller provides the essential high voltage and precision elements of a dual-channel bidirectional converter for example is automotive 48-V and 12-V dual battery systems. It supports multiphase parallel operation with balanced current sharing in each phase, and it can also support independent channel bi-directional operations making it versatile as standalone controller operating as Multiphase Buck / Boost or independent Buck or Boost.
The dual-channel differential current sense amplifiers and dedicated channel current monitors achieve typical accuracy of 1%. The robust 5-A half-bridge gate drivers are capable of driving parallel MOSFETs for scaling more power per channel. The controller can be dynamically programmed to operate in either the diode emulation mode (DEM) or forced PWM (FPWM) mode. Versatile protection features include cycle-by-cycle current limiting, overvoltage protection at both HV and LV ports, and overtemperature protection and urgent shutdown latch.
Technical documentation
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View all 3 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5171-Q1 Dual Channel Bidirectional Controller datasheet | PDF | HTML | 11 Apr 2023 |
| Functional safety information | LM5171-Q1 Functional Safety FIT, FMD, and Pin FMA (Rev. A) | PDF | HTML | 06 Oct 2023 | |
| Certificate | LM5171EVM-BIDIR EU Declaration of Conformity (DoC) | 05 May 2023 |
Design & development
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Reference designs
PMP41079 — Two-phase interleaved boost converter reference design for Class-H audio amplifiers
This reference design demonstrates a 450-W, 2-phase interleaved boost converter reference design for the Class-H audio amplifier application. To provide supply to the external audio amplifier, the controller is able to follow the Class-H control signal from the amplifier and generate an output (...)
Test report: PDF
| Package | Pins | Download |
|---|---|---|
| HTQFP (PHP) | 48 | View options |
Ordering & quality
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