Texas Instruments TPS54339 Synchronous Step-Down DC/DC Converter Evaluation Module TPS54339EVM-056 TPS54339EVM-056 Datenbogen
Produktcode
TPS54339EVM-056
Test Setup and Results
lists the R1 values for some common output voltages. For higher output voltages of 1.8 V or
above, a feedforward capacitor (C4) may be required to improve phase margin. Pads for this component
(C4) are provided on the printed-circuit board (PCB). Note that the resistor values given in
(C4) are provided on the printed-circuit board (PCB). Note that the resistor values given in
are
standard values and not the exact value calculated using
Table 3. Output Voltages
C8 + C9 + C10
Output
C4 (pF)
(1)
L1 (µH)
R1
R2
(µF)
Voltag
(k
Ω
)
(k
Ω
)
e (V)
Min
Typ
Max
Min
Typ
Max
Min
Max
1
6.81
22.1
5
150
220
1.5
2.2
4.7
22
68
1.05
8.25
22.1
5
150
220
1.5
2.2
4.7
22
68
1.2
12.7
22.1
5
100
1.5
2.2
4.7
22
68
1.5
21.5
22.1
5
68
1.5
2.2
4.7
22
68
1.8
30.1
22.1
5
22
2.2
3.3
4.7
22
68
2.5
49.9
22.1
5
22
2.2
3.3
4.7
22
68
3.3
73.2
22.1
5
22
2.2
3.3
4.7
22
68
5
124
22.1
5
22
3.3
4.7
22
68
6.5
165
22.1
5
22
3.3
4.7
22
68
(1)
Optional
3.2
Output Filter and Closed-Loop Response
The TPS54339 relies on the output filter characteristics to ensure stability of the control loop. The
recommended output filter components for common output voltages are given in
recommended output filter components for common output voltages are given in
. It may be
possible for other output filter component values to provide acceptable closed-loop characteristics. R3 and
TP4 are provided for convenience in breaking the control loop and measuring the closed-loop response.
TP4 are provided for convenience in breaking the control loop and measuring the closed-loop response.
4
Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54339EVM-056. The section also
includes test results typical for the evaluation modules and efficiency, output load regulation, output line
regulation, load transient response, output voltage ripple, input voltage ripple, start-up, and switching
frequency.
includes test results typical for the evaluation modules and efficiency, output load regulation, output line
regulation, load transient response, output voltage ripple, input voltage ripple, start-up, and switching
frequency.
4.1
Input/Output Connections
The TPS54339EVM-056 is provided with input and output connectors and test points as shown in
.
A power supply capable of supplying 2 A must be connected to J1 through a pair of 20 AWG wires. The
load must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability is 3
A. Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to
monitor the V
load must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability is 3
A. Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to
monitor the V
IN
input voltages with TP2 providing a convenient ground reference. TP8 is used to monitor
the output voltage with TP9 as the ground reference.
Table 4. Connection and Test Points
Reference Designator
Function
J1
V
IN
(see
for V
IN
range)
J2
V
OUT
, 1.05 V at 3-A maximum
JP1
EN control. Connect EN to OFF to disable, connect EN to ON to enable
TP1
V
IN
test point at V
IN
connector
TP2
GND test point at V
IN
connector
TP3
EN test point
TP4
Loop response measurement test point
TP5
VREG5 test point
TP6
Switch node test point
4
TPS54339EVM-056, 3-A, Regulator Evaluation Module
SLVU836 – January 2013
Copyright © 2013, Texas Instruments Incorporated