LM5171 Evaluaton Module
Abstract
The LM5171EVM-BIDIR Evaluation Module (EVM) is designed to showcase the LM5171 high performance dual-channel bidirectional controller, which is an excellent choice for, but not limited to, the automotive 48-V to 12-V dual battery system applications.
The EVM can be configured as a bidirectional power converter in the form of either a current source or voltage source. The direction of power flow can be controlled either by an external command signal or by the on-board jumper. Through the onboard interface headers, the EVM can be operated by a DSP, an FPGA, an MCU, or other digital controllers. Two EVMs can be paralleled to make a 3 or 4 phases interleaved converter for higher power. More EVMs can be paralleled for greater number of phases. Many convenient jumper headers are also included for versatile configurations of the EVM.
Refer to the LM5171 Multiphase Bidirectional Current Controller Data Sheet (SNVSCM3) for detailed technical information of the LM5171 device.
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| Read the user's guide before use. |
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| Hot surface! Contact can cause burns. Do not touch! |
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1 Features and Electrical Performance
The EVM supports the following features and performance capabilities:
- Input operating voltage ranges
- The 48VDC-port 6 V to 70 V, in the buck mode
- The 12VDC-port 6 V to 48 V, in the boost mode
- Output voltage regulation (with the onboard outer voltage regulation
activated)
- 14.5-V output voltage at the 12VDC-port, in the buck mode
- 50.5-V output voltage at the 48VDC-port, in the boost mode
- Operating current
- 60-Adc maximum from or into the 12VDC-port
- Typical 1% current regulation accuracy
- Typical 1% current monitor accuracy
- Switching frequency:
- Standalone Fsw = 100 kHz
- Able to synchronize to an external clock from 80 kHz to 120 kHz
- Maximum efficiency: >97%
- OVP threshold
- 75 V at the 48VDC-port
- 24 V at the 12VDC-port
- Other convenient features
- Optional onboard SEPIC converter providing +10V supply
- Onboard 5 V bias voltages and 3.5V voltage reference
- Onboard LM26LV Temperature Sensors Monitoring Local Temperatures of Power MOSFETs, with optional over temperature shutdown and LED indicator
- LED indicators of buck and boost operating modes
- Optional channel current shunt AC filters for accurate Digital Voltmeter (DVM) Reading
- Onboard two stage RC Filter for PWM input to ISET (J33)
- ISET voltage clamp input (J43)
- Square wave input for dithering (J14)
- I2C interface for monitoring and diagnose (J31)
- Output voltage tracking input (J37)
The electrical performance of the EVM is show in Table 1-1. Figure 2-1 shows the simplified EVM schematic.
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| INPUT CHARACTERISTICS | |||||
| 48VDC-Port | Buck mode operation (DIR > 2 V) | 6 | 48 | 70 | V |
| 12VDC-Port | Boost mode operation (DIR < 1 V) | 6 | 12 | 48 | V |
| OUTPUT CHARACTERISTICS | |||||
| Current delivery | 12VDC-Port input or output current (dual-channel enabled) | 0 | 60 | A | |
| Current regulation accuracy | 12VDC-Port current vs ISETA command voltage | 1% | |||
| Channel current monitor accuracy | When onboard IOUT1 and IOUT2 termination filter activated | 1% | |||
| 48VDC-Port | Boost mode operation (DIR < 1 V, onboard analog output voltage loop closed) | 50.5 | V | ||
| 12VDC-Port | Buck mode operation (DIR > 2 V, onboard analog output voltage loop closed) | 14.5 | V | ||
| SYSTEM CHARACTERISTICS | |||||
| Switching frequency | 100 | kHz | |||
| External clock synchronization | 80 | 120 | kHz | ||
| Full load efficiency | 97% | ||||
| Junction temperature, TJ | –40 | 150 | °C | ||
