Datasheet

2.2 Efficiency
EFFICIENCY vsOUTPUTCURRENT
50
55
60
65
70
75
80
85
90
0 1 2 3 4 5 6 7 8 9 10
I -OutputCurrent- A
O
V =3.3V
I
Efficiency-%
V =3V
I
V =4V
I
f =1600kHz,
V =3.3V,
V =1.8V
s
I
O
Test Setup and Results www.ti.com
Table 4. EVM Connectors and Test Points
Reference Designator Function
J1 SYNC input. Connection for external synchronization clock.
J2 V
OUT
, 1.8 V at 9 A maximum.
J3 V
IN
(see Table 1 for V
IN
range).
J4 2-pin header for enable. Connect EN to ground to disable, open to enable. Use to monitor SS/ENA
voltage.
TP1 Output voltage test point at VOUT connector
TP2 V
IN
test point at V
IN
connector.
TP3 Test point between voltage divider network and output. Used for loop response measurements.
TP4 PH test point.
TP5 GND test point at V
IN
connector.
TP6 GND test point at OUT connector.
The efficiency of this EVM peaks at a load current of about 1 A — 2.5 A and then decreases as the load
current increases towards full load. Figure 1 shows the efficiency for the TPS54917EVM-367 at an
ambient temperature of 25 ° C.
Figure 1. TPS54917EVM-367 Efficiency
The efficiency may be lower at higher ambient temperatures, due to temperature variation in the
drain-to-source resistance of the internal MOSFET.
TPS54917EVM-367 9-A, SWIFT™ Regulator Evaluation Module4 SLVU278 – December 2008
Submit Documentation Feedback