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Texas Instruments LM25149-Q1EVM-2100 Controller Evaluation Module

Texas Instruments LM25149-Q1EVM-2100 Controller Evaluation Module (EVM) is designed to showcase the performance of the LM25149-Q1 high-performance, automotive synchronous buck DC/DC buck controller. It operates over a wide input voltage range of 5.5V to 36V to deliver a fixed 5V output with better than 1% setpoint accuracy and up to 8A output current. The Texas Instruments LM25149-Q1 offers advanced EMI performance and ultra-low IQ. Regulator features during fault conditions include undervoltage lockout, internal soft-start, hiccup-mode overcurrent protection, and thermal shutdown. Open-drain PGOOD indicator and SYNC IN / SYNC OUT features are also provided.

Features

5.5V to 36V input voltage range
5V output voltage with 1% setpoint accuracy
Dual-random spread spectrum and active EMI filtering for advance EMI mitigation

Rated for 8A of load current
Ultra-low I_Q
Fully assembled, tested, and proven PCB layout with a small footprint

Required Equipment

Voltage Source
- Use an input voltage source capable of supplying 0V to 40V and 12A
Multimeters
- Voltmeter 1
  - Input voltage at VIN+ to VIN–
  - Set the voltmeter to an input impedance of 100MΩ
- Voltmeter 2
  - Output voltage at VOUT to GND
  - Set the voltmeter to an input impedance of 100MΩ
- Ammeter 1
  - Input current – set ammeter to 1-second aperture time
- Ammeter 2
  - Output current – set ammeter to 1-second aperture time
Electronic Load
- The load must be an electronic constant-resistance (CR) or constant-current (CC) mode load capable of 0Adc to 10Adc at 12V
- For a no-load input current measurement, disconnect the electronic load as it may draw a small residual current

Oscilloscope
- With the scope set to 20MHz bandwidth and AC coupling, measure the output voltage ripple directly across an output capacitor with a short ground lead normally provided with the scope probe
- Place the oscilloscope probe tip on the positive terminal of the output capacitor, holding the ground barrel of the probe through the ground lead to the negative terminal of the capacitor
- TI does not recommend using a long-leaded ground connection because this can induce additional noise given a large ground loop
- To measure other waveforms, adjust the oscilloscope as needed

Applications

High-current automotive electronic systems
ADAS and body electronics

Infotainment systems and instrument clusters
Automotive HEV/EV powertrain systems

Texas Instruments LM25149-Q1EVM-2100 Controller Evaluation Module

Features

Required Equipment

Applications

Test Setup

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