Texas Instruments Evaluation Module for UCD9224 Digital PWM System Controller UCD9224EVM-464 UCD9224EVM-464 データシート
製品コード
UCD9224EVM-464
Test Procedure
www.ti.com
7.2
Output Voltage
1. Attach the DMMs to both output voltage test points, +V
OUT1
to PGND and +V
OUT2
to PGND.
2. Enable the external input voltage supply.
3. Measure V
3. Measure V
OUT1
and V
OUT2
Output Voltages.
7.3
V
IN
UVLO Settings and OVP Setpoint
1. Remove the DMM from V
OUT2
and connect to the input voltage test points, V
IN
and PGND.
2. Slowly reduce the external input voltage supply until V
OUT1
is disabled then confirm V
IN
voltage level.
3. Slowly increase the external input voltage supply until V
OUT1
is enabled and confirm V
IN
voltage level.
4. Slowly increase the external input voltage supply until V
OUT1
is disabled and confirm V
IN
voltage level.
5. Return the input supply to 12.0 V, confirm operation is still disabled.
6. Disable the external input voltage source.
6. Disable the external input voltage source.
7.4
Turn-On Timing / Power Good
Testing the currently configured settings for Turn-On Timing and Power Good
1. Attach Channel 1 of the oscilloscope between V
OUT1
and PGND test points and Channel 2 between
V
OUT2
and PGND test points.
2. Set the oscilloscope to 1.0 V/div. vertical scale on both channels and set the time scale to 1 ms/div.
Set the Trigger source to Channel 1 with a single-shot acquisition.
3. Remove DMM from V
IN
and connect between the PGOOD (J2-2) and AGND (J2-3).
4. Enable the external input power supply.
5. Review captured waveform and active high PGOOD signal.
5. Review captured waveform and active high PGOOD signal.
Figure 5. V
OUT1
(Yellow), V
OUT2
(Blue) and PGOOD (Red) Start-Up Timing
14
UCD9224EVM-464 Digitally Controlled Dual-Rail POL
SLUU443 – March 2011
© 2011, Texas Instruments Incorporated