Datasheet

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1 Background
The TPS55340 DC/DC converter is in typical applications a step-up boost converter, however this EVM
uses it in a SEPIC topology. Rated input voltage and output current range for the evaluation module are
given in Table 1. This evaluation module demonstrates the performance of the TPS55340 in an example
application and can accommodate evaluation of other SEPIC applications supported by the TPS55340.
This design shows a small printed-circuit-board area that can be achieved when designing with the
TPS55340 regulator. However, appropriate sizing of the inductor and diode for the desired application can
further reduce the board area. The switching frequency is externally set at a nominal 500kHz. The 40V,
5A, low-side MOSFET is incorporated inside the TPS55340 package along with the gate drive circuitry.
The low drain-to-source on-resistance of the MOSFET allows the TPS55340 to achieve high efficiencies.
The compensation components are external to the integrated circuit (IC). In this example application the
absolute maximum input voltage for the TPS55340EVM-147 is 26V.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Maximum Output Current
TPS55340EVM-147 V
IN
= 6V to 18V I
OUT
max = 1A
2 Performance Specification Summary
Table 2 provides a summary of the TPS55340EVM-147 performance specifications. Specifications are
given for an input voltage of V
IN
= 6V and V
IN
= 18V with an output voltage of 12V, unless otherwise
specified. The ambient temperature is 25°C for all measurements, unless otherwise noted.
Table 2. Performance Specification Summary
Specification Test Conditions Min Typ Max Unit
V
IN
voltage range 6 12 18 V
Output voltage set point 12 V
Line regulation I
OUT
= 500mA, V
IN
= 6V to 18V ±0.1%
Operating frequency 500 kHz
Output current range .001 1 A
Output over current limit
(1)
V
IN
= 6V 1.5 2.6 A
Output over current limit
(1)
V
IN
= 18V 1.9 3.4 A
Load regulation I
OUT
= 1mA to 1A, V
IN
= 6V to 18V ±0.1%
Voltage change –480 mV
I
OUT
= 250mA to 750mA,
V
IN
= 6V
Recovery time 1 ms
Load transient response
Voltage change 480 mV
I
OUT
= 750mA to 250mA,
V
IN
= 6V
Recovery time 1 ms
Loop bandwidth I
OUT
= 1A, V
IN
= 6V 6.3 kHz
Phase margin I
OUT
= 1A, V
IN
= 6V 59.3 °
Loop bandwidth I
OUT
= 1A, V
IN
= 18V 13.2 kHz
Phase margin I
OUT
= 1A, V
IN
= 18V 66.5 °
Output ripple voltage I
OUT
= 1A, V
IN
= 6V 60 mVpp
Output ripple voltage I
OUT
= 1A, V
IN
= 18V 40 mVpp
Maximum efficiency TPS55340EVM-147, V
IN
= 6V, I
OUT
= 350mA 92.1%
Maximum efficiency TPS55340EVM-147, V
IN
= 18V, I
OUT
= 1A 92.1%
(1)
The over current limit is dependent on the input voltage and based on peak current limit of the TPS55340.
2
TPS55340EVM-147, 6V to 18V Input, 12V Output SEPIC Evaluation Module SLVU742A–June 2012–Revised August 2013
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