Texas Instruments TPS55340EVM-017 User manual

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TPS55340EVM-017, 5-V to 12-V Input, 24-V Output Boost Evaluation Module
(1) All trademarks are the property of their respective owners.
(1) User's Guide
SLVU668B–April 2012–Revised July 2019
TPS55340EVM-017, 5-V to 12-V Input, 24-V Output Boost
Evaluation Module
This user’s guide contains information for the TPS55340EVM-017 evaluation module (EVM) as well as the
TPS55340 DC/DC converter. The document includes the performance specifications, schematic, and the
bill of materials for the TPS55340EVM-017.
Contents
1 Background................................................................................................................... 2
2 Performance Specification Summary ..................................................................................... 2
3 Modifications.................................................................................................................. 3
4 Test Setup and Results..................................................................................................... 3
5 Board Layout................................................................................................................ 12
6 Schematic and Bill of Materials........................................................................................... 15
List of Figures
1 TPS55340EVM-017 Efficiency............................................................................................. 4
2 TPS55340EVM-017 Output Voltage Load Regulation.................................................................. 5
3 TPS55340EVM-017 Output Voltage Line Regulation................................................................... 5
4 TPS55340EVM-017 VIN = 5-V Transient Response..................................................................... 6
5 TPS55340EVM-017 VIN = 12-V Transient Response ................................................................... 6
6 TPS55340EVM-017 Loop Response ..................................................................................... 7
7 TPS55340EVM-017 VIN = 5-V Output Ripple ............................................................................ 7
8 TPS55340EVM-017 VIN = 12-V Output Ripple........................................................................... 8
9 TPS55340EVM-017 DCM Output Ripple................................................................................. 8
10 TPS55340EVM-017 VIN = 12-V Pulse-Skipping ......................................................................... 9
11 TPS55340EVM-017 VIN = 5-V Input Voltage Ripple .................................................................... 9
12 TPS55340EVM-017 VIN = 12-V Input Voltage Ripple ................................................................. 10
13 TPS55340EVM-017 Power Up With EN ................................................................................ 10
14 TPS55340EVM-017 Power Down With EN............................................................................. 11
15 TPS55340EVM-017 Power Up With VIN................................................................................. 11
16 TPS55340EVM-017 Power Down With VIN ............................................................................. 12
17 TPS55340EVM-017 Top-Side Assembly ............................................................................... 13
18 TPS55340EVM-017 Top-Side Layout................................................................................... 13
19 TPS55340EVM-017 Internal Layer-1 Layout........................................................................... 14
20 TPS55340EVM-017 Internal Layer-2 Layout........................................................................... 14
21 TPS55340EVM-017 Bottom-Side Layout ............................................................................... 15
22 TPS55340EVM-017 Schematic .......................................................................................... 15

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TPS55340EVM-017, 5-V to 12-V Input, 24-V Output Boost Evaluation Module
1 Background
The TPS55340 DC/DC converter is a step-up boost converter. Rated input voltage and output current
range for the evaluation module are given in Table 1. This EVM demonstrates the performance of the
TPS55340 in an example application and accommodates evaluation of other boost applications supported
by the TPS55340. This design shows that a small printed-circuit-board area is possible 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 600
kHz. The 40-V, 5-A, 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 achieves high efficiencies with the
TPS55340. The compensation components are external to the integrated circuit (IC). The absolute
maximum input voltage is 32 V for the EVM.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Maximum Output Current
TPS55340EVM-017 VIN = 5 V to 12 V IOUTmax = 800 mA (VIN = 5 V) to 1.9 A (VIN = 12 V)
2 Performance Specification Summary
Table 2 provides a summary of the EVM performance specifications. Specifications are given for an input
voltage of VIN =5VandVIN = 12 V with an output voltage of 24 V, 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
VIN voltage range 5 12 V
Output voltage set point 24 V
Line regulation IOUT = 800 mA, VIN = 5 V to 12 V ±1%
Operating frequency 600 kHz
Specifications for VIN = 5.0 V
Output current range 1 800 mA
Load regulation IOUT = 1 mA to 800 mA ±1%
Load transient response
IOUT = 200 mA to 600 mA Voltage change –720 mV
Recovery time 1 ms
IOUT = 600 mA to 200 mA Voltage change 720 mV
Recovery time 1 ms
Loop bandwidth IOUT = 800 mA 5.3 kHz
Phase margin IOUT = 800 mA 66.5 °
Output ripple voltage IOUT = 800 mA 150 mVpp
Maximum efficiency TPS55340EVM-017, VIN = 5 V, IOUT = 300 mA 92.1%
Specifications for VIN = 12 V
Output current range 0.001 1.9 A
Load regulation IOUT = 1 mA to 1.9 A ±1%
Load transient response
IO= 475 mA to 1.425 A Voltage change –720 mV
Recovery time 1 ms
IOUT = 1.425 A to 475 mA Voltage change 720 mV
Recovery time 1 ms
Loop bandwidth IOUT = 1.9 A 15.6 kHz
Phase margin IOUT = 1.9 A 59.6 °
Output ripple voltage IOUT = 1.9 A 200 mVpp
Maximum efficiency TPS55340EVM-017, IOUT = 800 mA 95.9%

OUT
V
R1 R2 1
1.229 V
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= ´ -
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TPS55340EVM-017, 5-V to 12-V Input, 24-V Output Boost Evaluation Module
3 Modifications
These evaluation modules provide access to the features of the TPS55340. Some modifications to this
module are possible.
3.1 Output Voltage Set Point
The resistor divider network of R1 and R2 sets the output voltage. Keep R2 fixed at or close to 10 kΩ.
Change the output voltage of the EVM by changing the value of resistor R1. Calculate the value of R1 for
a specific output voltage by using Equation 1.
(1)
Note that VIN must be in a range so that the on-time is greater than the minimum controllable on-time (77
ns typical), and the maximum duty cycle is less than 89% minimum and 93% typical.
3.2 Maximum Output Current
After adjusting input or output voltage settings, verify the maximum output current pursuant to the
equations given on the data sheet.
3.3 Slow-Start Time
Adjust the slow-start time by changing the value of C3. The EVM uses C3 = 0.047 µF, as recommended
on the data sheet, avoiding any overshoot during start-up. A larger capacitance increases the slow-start
time while a smaller capacitance decreases it.
3.4 Other Modifications
Please see data sheet recommendations and equations when changing the switching frequency,
input/output voltage range, input inductor, output capacitors or compensation.
4 Test Setup and Results
This section describes how to properly connect, set up, and use the EVM. Included are test results typical
for the evaluation module covering efficiency, output voltage regulation, load transients, loop response,
output ripple, input ripple, start-up and shut-down.
4.1 Input/Output Connections
The EVM is provided with input and output connectors and test points as shown in Table 3. Connect a
power supply capable of supplying 5 A 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 1.9 A. Minimize wire lengths to reduce losses in the
wires. Header J1 provides a place to monitor the VIN 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 VIN input voltage connector. (See Table 1 for VIN range.)
JP1 3-pin header for enable. Jumper installed from pins 1-2 enables and from pins 2-3 disables.
TP1 SW test point
TP2 Test point between voltage divider network and output. Used for loop-response measurements.

0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2
Output Current (A)
Efficiency (%)
VIN = 5V
VIN = 12V
G001
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TPS55340EVM-017, 5-V to 12-V Input, 24-V Output Boost Evaluation Module
Table 3. EVM Connectors and Test Points (continued)
Reference Designator Function
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 300 mA at 5-V input and 800 mA at 12-V input,
then decreases as the load current increases toward full load. Figure 1 shows the efficiency for the EVM
at an ambient temperature of 25°C.
Figure 1. TPS55340EVM-017 Efficiency
The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-
source resistance of the internal MOSFET.
4.3 Output Voltage Load Regulation
Figure 2 shows the load regulation for the EVM.

Input Voltage (V)
24.2
24.22
24.24
24.26
24.28
24.3
0 0.5 1 1.5 2
Output Current (A)
Output Voltage (V)
VIN = 5V
VIN = 12V
G002
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Figure 2. TPS55340EVM-017 Output Voltage Load Regulation
Measurements are for an ambient temperature of 25°C.
4.4 Output Voltage Line Regulation
Figure 3 shows the line regulation for the EVM with a 32-Ω(750-mA) load.
Figure 3. TPS55340EVM-017 Output Voltage Line Regulation

VOUT AC Coupled (500 mV/div)
IOUT (200 mA/div)
Timebase (1.00 ms/div)
VOUT AC Coupled (500 mV/div)
IOUT (200 mA/div)
Timebase (1.00 ms/div)
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4.5 Load Transients
Figure 4 and Figure 5 show the EVM's response to load transients. The current step is from 25% to 75%
of maximum rated load at a 5-V input and a 12-V input respectively. The current step slew rate is 10
mA/µs. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output.
Figure 4. TPS55340EVM-017 VIN = 5-V Transient Response
Figure 5. TPS55340EVM-017 VIN = 12-V Transient Response

IL(1.00 A/div)
SW (20.0 V/div)
VOUT AC Coupled (100 mV/div)
Timebase (1.00 µs/div)
100 1000 10000 100000 1000000
−60
−40
−20
0
20
40
60
−180
−120
−60
0
60
120
180
Frequency (Hz)
Gain (dB)
Phase (°)
VIN = 5V Gain
VIN = 5V Phase
VIN = 12V Gain
VIN =12V Phase
G006
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TPS55340EVM-017, 5-V to 12-V Input, 24-V Output Boost Evaluation Module
4.6 Loop Characteristics
Figure 6 shows the EVM loop-response characteristics. Gain and phase plots are shown for VIN voltages
of 5 V and 12 V with load currents of 800 mA and 1.9 A, respectively.
Figure 6. TPS55340EVM-017 Loop Response
4.7 Output Voltage Ripple
Figure 7 shows the EVM output voltage ripple and inductor current ripple. The output current is the rated
full load of 800mA and VIN = 5 V. The ripple voltage is measured directly across the output capacitors.
Figure 7. TPS55340EVM-017 VIN = 5-V Output Ripple

IL(1.00 A/div)
SW (20.0 V/div)
VOUT AC Coupled (10 mV/div)
Timebase (1.00 µs/div)
Timebase (1.00 µs/div)
IL(1.00 A/div)
SW (20.0 V/div)
VOUT AC Coupled (100 mV/div)
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Figure 8 shows the EVM output voltage ripple and inductor current ripple. The output current is the rated
full load of 1.9 A and VIN = 12 V. The ripple voltage is measured directly across the output capacitors.
Figure 8. TPS55340EVM-017 VIN = 12-V Output Ripple
Figure 9 shows the EVM output voltage ripple, inductor current ripple and switching waveform while
operating in discontinuous conduction mode (DCM). The input voltage is 5 V and the output is loaded with
1.2 kΩ.
Figure 9. TPS55340EVM-017 DCM Output Ripple

SW (20.0 V/div)
VIN AC Coupled (50.0 mV/div)
IL(1.00 A/div)
Timebase (1.00 µs/div)
SW (10.0 V/div)
VOUT AC Coupled (20.0 mV/div)
Timebase (500 µs/div)
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4.8 Pulse-Skipping Operation
The TPS55340 features pulse-skipping for output regulation when operating at light loads. Figure 9 shows
the output voltage ripple and the pulse-skipping at SW. The input voltage is 12 V.
Figure 10. TPS55340EVM-017 VIN = 12-V Pulse-Skipping
4.9 Input Voltage Ripple
Figure 11 shows the EVM input voltage ripple. The output current is the rated full load of 800 mA at VIN =
5 V. The ripple is measured directly across the input capacitor, C2.
Figure 11. TPS55340EVM-017 VIN = 5-V Input Voltage Ripple

SW (20.0 V/div)
EN (2.00 V/div)
VIN (5.00 V/div)
VOUT (10.0 V/div)
Timebase (2.00 ms/div)
SW (20.0 V/div)
VIN AC Coupled (50.0 mV/div)
IL(1.00 A/div)
Timebase (1.00 µs/div)
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Figure 12 shows the EVM input voltage ripple. The output current is the rated full load of 1.9 A at VIN = 12
V. The ripple is measured directly across the input capacitor. C2.
Figure 12. TPS55340EVM-017 VIN = 12-V Input Voltage Ripple
4.10 Powering Up and Down with EN
Figure 13 shows the start-up waveforms for the EVM. The input voltage is 5 V, the EN goes high and the
output voltage ramps from VIN to 24V. The load is 120 Ω.
Figure 13. TPS55340EVM-017 Power Up With EN