10
8) Increase load gradually and observe the difference in voltages present at the monitoring
points. The set voltage (3.3V) will be regulated at the load; this will be noted at TP13 and
TP14. The direct output of the converter (J5 pin 2, 3) will read a higher voltage. As IR
losses increase over load wires and terminals the direct output of the converter will
compensate by raising the voltage to keep within regulation at the load.
Caution: long distance runs from the output of the converter and the load will cause erratic behavior. This can
show up as pulse width jitter or an oscillatory effect on the ripple voltage. If this condition occurs, check the set up
and make adjustments. Please see Figure 5 below for test up.
TP1
TP2
J2
-
+
Tracking Enable
Jumper
Disabled
1
12
9
6
11
8
5
13
10
7
4
3
2
1
Enable S1
J3
15
14
4
1
2
3
Tracking Engage S2
LOAD1
3.3V @
10A
-
+
-
-
+
+
TP14
TP13
J5
Voltmeter
#2
-
+
Sense Jumper
Enabled
Remote GND Sense Jumper
Enabled
Max 6" length
Max 6" length
Max 6" length
Input Supply
Voltmeter
#3
+
-
Voltage monitored at the output
connector.
NOTE: This w ill read a higher
value as load current increases.
Voltage w ill be regulated to set
voltage at the LOAD.
Voltage monitored at the load.
Reading can be taken at the
load if desired. NOTE: This is
the point to w hich the converter
w ill be regulating to.
4
2
3
1
Figure 5: TPS40100EVM-001 Recommended Remote Test Set-Up
5.3.3 Voltage Tracking Test Set-Up
The following procedure is for a single EVM demonstration of the track function. Please see Figure 6 below.
1. Shunt pins 2&3 of J8 (Tracking Enable Jumper)
2. Tracking Engage Switch (S2) should be in the closed position.
3. Connect oscilloscope probe to the TRACKING IN pin (J3 pin 1) and the Vout (TP 17&18).
4. Connect load to the output of the EVM and set from 1A – 10A. (User selectable)
5. Power on the EVM with an input voltage of 10.8V – 13.2V. ( Allow for SS voltage to reach 3.5V to
ensure proper tracking performance or wait 1-2 seconds)
6. Open the Tracking Engage Switch (S2) (Shorting pins 1&2 open) and observe how Vout tracks
the TRACKING IN pins rising voltage. Waveforms should be simultaneous.
7. Close the Tracking Engage (S2) (Shorting pins 2&3 open) and observe how Vout tracks the
TRACKING IN pin’s falling voltage. Waveforms should be simultaneous.
Summary of Contents for TPS40100
Page 4: ...4 4 SCHEMATIC Figure 1 TPS40100EVM 001 Power Stage Control Schematic ...
Page 5: ...5 Figure 2 TPS40100EVM 001 Margin Control Component values are for reference only ...
Page 16: ...16 Iout 10A Figure 11 Power on from enable ...
Page 24: ...24 Figure 19 TPS40100EVM 001 Component Placement Viewed from Top ...
Page 25: ...25 Figure 20 TPS40100EVM 001 Silkscreen Viewed from Top ...
Page 26: ...26 Figure 21 TPS40100EVM 001 Top Copper Viewed from Top ...
Page 27: ...27 Figure 22 TPS40100EVM 001 Layer 2 X Ray View from Top ...
Page 28: ...28 Figure 23 TPS40100EVM 001 Layer 3 X Ray View from Top ...