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3 / 15 page CH1-Vin CH2-Vsw CH3 -Vout CH4 -Vpg 4.5 VDC Output Load Input P/S#1 www.ti.com Test Summary Table 1. Setup I/O Connections and Configuration for TPS62090EVM Evaluation (continued) Jack/Component (Silk Screen) Connect or Adjustment to: J4-2 (GND) Negative lead of DMM #3 JP1-1/2 (ON) Apply shunt to ON for converter operation JP1-2/3 (OFF) JP2-1/2 (1.4 MHz) Apply shunt to 1.4 MHz JP1-2/3 (2.8 MHz) Connect the meters, scope probes (see Figure 1), 2- Ω output load, shunt jumpers, and input power supply ( Table 1); set the oscilloscope to 200 ns/div, positive trigger or HF trigger on CH2; CH1: ac-coupled, 50 mV/div; CH2: dc-coupled, 2 V/div; CH3: ac-coupled, 10 mV/div; CH4: dc-coupled, 10 V/div. Users can replace resistive load with system load or decade load box to vary load (2- Ω to 25-Ω load). Figure 1. EVM Schematic and Evaluation Setup 3.3 Test Procedure 1. Set up the EVM is according to Table 1 and Figure 1, and preset the power supply to 4.5 Vdc at approximately 2.5-A current limit. 2. Turn on input supply, and verify that the input voltage is approximately 4.5 Vdc (DMM#1) and the output voltage is at approximately 1.8 Vdc (DMM#2). 3. Refer to Figure 2, and verify that the duty cycle is near 40%, input ripple is less than 50 mVpp (ignoring switching spikes) and the output ripple is less than 10 mVpp. These waveforms were taken with high-frequency probes (meaning that the ground lead was short (approximately 1 cm). This reduces the high-frequency spikes that the ground loop on the probe picks up. 4. Vary input voltage between 2.6 V and 5.5 V, and observe the change in duty cycle and ripple waveforms. Set Vin back to 4.5 Vdc. 5. Move JP2 From: 1.4 MHz to 2.8 MHz. Verify that the change is switching frequency as shown in Figure 3. Return the JP2 shunt back to the 1.4-MHz setting. 6. Change the output load to 25 Ω, set CH3 to 50mV/div, and verify how the duty cycle changes into a burst low-power mode as seen in Figure 4. At the end of the burst switching, the inductor’s current goes to zero, becomes discontinuous, and rings with the FET and output capacitance (normal operation at light loads). Set the load back to approximately 2 Ω. 7. Turn off the input supply. Set CH1 to dc coupled, 2 V/div; set CH3 to dc coupled, 1 V/div; CH4 to dc coupled, 5 V/div; set oscilloscope timing to 500 µs/div, set scope trigger to positive or HF trigger on CH1, and arm oscilloscope. Turn on laboratory supply. The laboratory supply used to capture Figure 5 3 SLVU670A – March 2012 – Revised May 2012 TPS62090EVM-063 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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