Texas Instruments TPS26600-02EVM, Руководство пользователя, Страница: 8 / 24

General Configurations
www.ti.com
8 SLVUAV3A – August 2016 – Revised February 2017
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
TPS26600-02EVM: Evaluation Module for TPS2660x
4. Further reduce the CH1 input voltage and verify that VOUT1 reduces as VN1 reduces and drops to
zero when VIN1 falls below 9 V ±0.5 V (CH1 UVLO limit).
5. Increase the CH2 input voltage (VIN2) and monitor the output voltage (VOUT2). Verify that VOUT2
increases as VN2 increases and drops to zero when VIN2 exceeds 33 V ±1 V (CH2 OVP limit).
6. Reduce the CH2 input voltage and verify that the output turns on at 30 V ±1 V.
7. Further reduce the CH2 input voltage and verify that VOUT2 reduces as VN2 reduces and drops to
zero when VIN2 falls below 14 V ±0.5 V (CH2 UVLO limit).
8. Verify that CH1 and CH2 FLTb red LEDs (D1/D7) turn on whenever the supply voltage reaches either
OVP or UVLO limits of the respective channels.
9. Disable the power supply and the load.
4.4.3 Output Voltage Start-Up Time Test
Follow the instructions to verify the individual channels output voltage start-up time:
1. Set up the oscilloscope as listed in Table 8 .
2. Set the load resistance to 16 Ω ±1 Ω and the power supply voltage to 24 V.
3. Enable the load.
4. Enable the power supply and verify that the output voltage startup waveform is as shown in Figure 3 .
Table 8. TPS26600-02EVM Oscilloscope Setting for the Output Voltage Start-Up Test
Oscilloscope Setting CH1 Probe Points CH2 Probe Points
Channel 1 = 10 V / div VOUT1 (TP3) VOUT2 (TP12)
Channel 2 = 10 V / div VIN1 (TP2) VIN2 (TP11)
Channel 3 = 20 V / div FLTb1 (TP1) FLTb2 (TP10)
Channel 4 = 1 A / div Input current into T1 +Ve wire Input current into T3 +Ve wire
Trigger source = Channel 1
Trigger level = 12 V ±1 V
Trigger polarity = Rising
Trigger mode = Single
Time base 2 ms / div
Figure 3. Output Voltage Start-Up Waveform