Datasheet

100

0 0.5 1

Output Current (A)

Efficiency (%)

VIN = 6V

VIN = 12V

VIN = 18V

G001

Test Setup and Results

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4.1 Input/Output Connections

The TPS55340EVM-147 is provided with input/output connectors and test points as shown in Table 3.

Connect a power supply capable of supplying 5A to J6 through a pair of 20 AWG wires. The jumper

across JP1 in the ON position (1-2) must be in place. Connect the load to J7 through a pair of 20 AWG

wires. The maximum load current capability must be at least 1A. Wire lengths must be minimized to

reduce losses in the wires. Header J1 provides a place to monitor the V

input voltages with J3 providing

a convenient ground reference. Use J2 to monitor the output voltage with J4 as the ground reference.

Table 3. EVM Connectors and Test Points

Reference Designator Function

J1 2-pin header for VIN input voltage connections

J2 2-pin header for VOUT input voltage connections

J3,J4 2-pin header for GND connections

J5 2-pin header for synchronizing signal and ground

J6 V

input voltage connector. (See Table 1 for V

range.)

JP1 3-pin header for enable. Install jumper from pins 1-2 to enable or from pins 2-3 to disable.

TP1 SW test point

TP2 Test point between voltage divider network and output. Used for loop response measurements.

TP3 COMP test point

TP4 Output voltage test point at VOUT connector

TP5 GND test point at VOUT connector

4.2 Efficiency

The efficiency of this EVM peaks at a load current of about 300mA at 6V input and 1A at 18V input, then

decreases as the load current increases toward full load. Figure 1 shows the efficiency for the

TPS55340EVM-147 at an ambient temperature of 25°C.

Figure 1. TPS55340EVM-147 Efficiency

The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-

source resistance of the internal MOSFET.

TPS55340EVM-147, 6V to 18V Input, 12V Output SEPIC Evaluation Module SLVU742A–June 2012–Revised August 2013

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