SNVU543A November   2016  – December 2016 LM5170 , LM5170-Q1

 

  1.   LM5170-Q1 EVM User Guide
    1.     Trademarks
    2. 1 Features and Electrical Performance
    3. 2 Setup
      1. 2.1 EVM Configurations
      2. 2.2 Bench Setup
      3. 2.3 Test Equipment
    4. 3 Test Procedure
      1. 3.1 Buck Mode Power-Up and Power-Down Sequence
      2. 3.2 Boost Mode Power-Up and Power-Down Sequence
      3. 3.3 Bidirectional Operation Power-Up and Power-Down Sequence
      4. 3.4 Operating the EVM With the Onboard Analog Loop Control Circuit
      5. 3.5 Operating the EVM With External MCU or Other Digital Circuit
    5. 4 Test Data
      1. 4.1  Efficiency
      2. 4.2  Current Regulation and Monitoring
      3. 4.3  Typical Master Enable Power Up and Shutdown
      4. 4.4  Channel Enable and Disable
      5. 4.5  Dual-Channel Interleaving Operation
      6. 4.6  ISETA Tracking
      7. 4.7  Diode Emulation Preventing Negative Currents
      8. 4.8  Dynamic DIR Change
      9. 4.9  Step Load Response
      10. 4.10 OVP
      11. 4.11 Output Short Circuit
    6. 5 Design Files
      1. 5.1 Schematics
      2. 5.2 Bill of Materials
      3. 5.3 Board Layout
  2.   Revision History

1 Features and Electrical Performance

The EVM supports the following features and performance capabilities:

  • Input Operating Voltage Ranges
    • The 48VDC-Port 6 V to 75 V, in the Buck Mode
    • The 12VDC-Port 3 V to 48 V, in the Boost Mode
  • Output Voltage Regulation (With the Onboard Outer Voltage Loop Control 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
    • 22 V at the 12VDC-Port
    • Synchronous Rectifier Diode Emulation Function Preventing Negative Current
  • Other Convenient Features
    • Optional Onboard Wide-VIN™ LM5118-Q1 Buck-Boost Converter as the +10-V Supply
    • Onboard Ultra Low IQ TPS709-Q1 LDOs for +3.3-V and +5.0-V Bias Voltages for Convenient EVM Configurations and for Biasing the External MCU through Headers.
    • Onboard LM26LV Temperature Sensors Monitoring Local Temperatures of Power MOSFETs, With Optional Overtemperature Shutdown and LED Indicator.
    • LED indicators of Buck and Boost Operating Modes.
    • Optional Channel Current Shunt AC Filters for Accurate DVM Reading (Unpopulated).

The electrical performance of the EVM is show in Table 1. Figure 1 shows the simplified EVM schematic.

Table 1. Electrical Performance

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) 3 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