Datasheet

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4.2.2 Diagram
See Tip and Barrel
Measurement for V
OUT
Ripple
UDG−06084
LOAD 1
1.5V @
15A
−
+
−
+
V1
FAN
−1V5_OUT +
+12 V_IN −
+
−
Oscilloscope
++−−
A1
−
+
TP1
TP2
TP16
TP15
TP5
TP7 TP6
J2
J1
V2
+
−
−
+
TP18
TP17
GND
CHA CHB
TP21
TP19
TP20
Shutdown
V
12V_IN
TEXAS INSTRUMENTS
TPS40075EVM−001
12V to 1.5V @ 15A with Remote Sense
HPA187
1MW AC
10mV/div
20MHz
TP16
TP15
Metal Ground
Barrel
Probe
Tip
Tip and Barrel V
OUT
Ripple Measurement
UDG−06085
4.3 Start Up/Shut Down Procedure
Test Set Up
Figure 2. TPS40075EVM-001 Recommended Test Set-Up
Figure 3. Output Ripple Measurement – Tip and Barrel using TP15 and TP16
1. Increase V
12V_IN
(V1) from 0 V to 10 V
DC
.
2. Vary LOAD1 from 0–10 A
DC
3. Vary V
12V_IN
(V1) from 10Vdc to 14Vdc
4. Short TP21 to TP19 to disable switching and tri-state output.
5. Remove TP21 to TP19 short to enable output
6. Decrease LOAD1 to 0 A.
7. Decrease V
12V_IN
to 0 V.
Using the TPS40075: A 12-V to 1.5-V @ 15-A Synchronous Buck Converter8 SLUU254 – DECEMBER 2006
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