Texas Instruments TPS26600-02EVM, Руководство пользователя, Страница: 7 / 24

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General Configurations
7 SLVUAV3A – August 2016 – Revised February 2017
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TPS26600-02EVM: Evaluation Module for TPS2660x
4.4 Test Procedure
NOTE: CH1 and CH2 can be tested one by one with a single power supply and the load.
4.4.1 Preliminary Tests
1. Turn on the power supply and set the output voltage and the current limit according to Table 5 .
Table 5. Power Supply Setting for the TPS26600-02EVM
EVM Channel Voltage Set Point Power Supply Current
Limit
TPS26600-02EVM CH1 24 V 3 A
CH2 24 V 3 A
2. Turn on the load and set the load resistance to 16
Ω
±1
Ω
.
3. Disable the power supply, load and hook up the TPS26600-02EVM assembly as shown in Figure 2
4. Make sure the default evaluation board jumper settings are as shown in Table 6 .
Table 6. Default Jumper Setting for the TPS26600-02EVM
J1 J2 J3 J4 J5 J6 J7
CH1 Install Install Do not
populate
2-3 1-2 Do not
populate
Do not
populate
J8 J9 J10 J11 J12 J13 J14
CH2 Install Install Do not
populate
2-3 1-2 Install Install
5. Enable the power supply and the load.
6. Connect the negative probe of the DMM to TP7 or TP18 test points, the positive probe to the
respective test points, and verify that the voltages shown in Table 7 are obtained.
Table 7. TPS26600-02EVM DMM Readings at Different Test Points
Voltage test on (CH1) Measured Voltage Reading Voltage test on (CH2) Measured Voltage Reading
VIN1 (TP2) 24 V ±1 V DC VIN2 (TP11) 24 V ±1 V DC
VOUT1 (TP3) 24 V ±1 V DC VOUT2 (TP12) 24 V ±1 V DC
IMON1 (TP5) 2.3 V ±0.2 V DC IMON2 (TP14) 2.3 V ±0.2 V DC
FLTb1 (TP1) 22.6 V ±0.5 V DC FLTb2 (TP10) 22.6 V ±0.5 V DC
SHDNb1 (TP4) 2.7 V ±0.5 V DC SHDNb2 (TP13) 2.7 V ±0.5 V DC
7. Press the CH1/CH2 shutdown switch S1/S2 and verify the CH1/CH2 output voltage VOUT1/VOUT2
drops to zero. Release the S1/S2 switch and verify the output voltage resumes to nominal 24 V ±1 V.
8. Disable the power supply and the load.
4.4.2 UVLO, OVP Tests
Follow the instructions to verify undervoltage and overvoltage levels of the device:
1. Set the load resistance to 24 Ω ±1 Ω and the power supply voltage to 24 V. Enable the power supply
and the load.
2. Increase the CH1 input voltage (VIN1) and monitor the output voltage (VOUT1). Verify that VOUT1
increases as VN1 increases and drops to zero when VIN1 exceeds 40 V ±1 V (CH1 OVP limit).
3. Reduce the CH1 input voltage and verify that the output turns on at 36 V ±1 V.