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This user's guide contains background information for the TPS54231 as well as support documentation for the TPS54231EVM-372 evaluation module (HPA372). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54231EVM-372.
The TPS54231 dc/dc converter is designed to provide up to a 2 A output from an input voltage source of 3.5 V to 28 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1. This evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS54231 regulator. The switching frequency is internally set at a nominal 570 kHz. The high-side MOSFET is incorporated inside the TPS54231 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFET allows the TPS54231 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are external to the integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54231 provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 30 V for the TPS54231EVM-372.
EVM | INPUT VOLTAGE RANGE | OUTPUT CURRENT RANGE |
---|---|---|
TPS54231EVM-372 | VIN = 7 V to 28 V | 0 A to 2 A |
A summary of the TPS54231EVM-372 performance specifications is provided in Table 1-2. Specifications are given for an input voltage of VIN = 15 V and an output voltage of 3.3 V, unless otherwise specified. The TPS54231EVM-372 is designed and tested for VIN = 7 V to 28 V. The ambient temperature is 25°C for all measurements, unless otherwise noted.
SPECIFICATION | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
VIN voltage range | 7 | 15 | 28 | V | |||
Output voltage set point | 3.3 | V | |||||
Output current range | VIN = 7 V to 28 V | 0 | 2 | A | |||
Line regulation | IO = 1 A, VIN = 7 V to 28 V | ±0.15% | |||||
Load regulation | VIN = 15 V, IO = 0 A to 2 A | ±0.15% | |||||
Load transient response | IO = 0.5 A to 1.5 A | Voltage change | –100 | mV | |||
Recovery time | 150 | μs | |||||
IO = 1.5 A to 0.5 A | Voltage change | 100 | mV | ||||
Recovery time | 150 | μs | |||||
Loop bandwidth | VIN = 15 V, IO = 1 A | 27 | kHz | ||||
Phase margin | VIN = 15 V , IO = 1 A | 55 | ° | ||||
Input ripple voltage | IO = 2 A | 125 | mVpp | ||||
Output ripple voltage | IO = 2 A | 5 | mVpp | ||||
Output rise time | 6 | ms | |||||
Operating frequency | 570 | kHz | |||||
Maximum efficiency | TPS54231EVM-372, VIN = 7 V, IO = 0.5 A | 92.7% |
These evaluation modules are designed to provide access to the features of the TPS54231. Some modifications can be made to this module.
To change the output voltage of the EVM, it is necessary to change the value of resistor R6. Changing the value of R6 can change the output voltage above 0.8 V. The value of R6 for a specific output voltage can be calculated using Equation 1.
Table 1-3 lists the R6 values for some common output voltages. Note that VIN must be in a range so that the minimum on-time is greater than 130 ns, and the maximum duty cycle is less than 91%. The values given in Table 1-3 are standard values, not the exact value calculated using Equation 1.
Output Voltage (V) | R6 Value (kΩ) | |
---|---|---|
1.8 | 8.25 | |
2.5 | 4.75 | |
3.3 | 3.24 | |
5 | 1.96 |
This section describes how to properly connect, set up, and use the TPS54231EVM-372 evaluation module. The section also includes test results typical for the evaluation module and covers efficiency, output voltage regulation, load transients, loop response, output ripple, input ripple, and start-up.
The TPS54231EVM-372 is provided with input/output connectors and test points as shown in Table 2-1. 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 J4 through a pair of 20 AWG wires. The maximum load current capability must be 2 A. Wire lengths must be minimized to reduce losses in the wires. Test-point TP1 provides a place to monitor the VIN input voltages with TP2 providing a convenient ground reference. TP5 is used to monitor the output voltage with TP6 as the ground reference.
Reference Designator | Function |
---|---|
J1 | VIN (see Table 1-1 for VIN range) |
J2 | 2-pin header for enable. Connect EN to ground to disable, open to enable. |
J3 | 2-pin header for slow start monitor and GND. |
J4 | VOUT, 3.3 V at 2 A maximum |
TP1 | VIN test point at VIN connector |
TP2 | GND test point at VIN |
TP3 | PH test point |
TP4 | Test point between voltage divider network and output. Used for loop response measurements. |
TP5 | Output voltage test point at OUT connector |
TP6 | GND test point at OUT connector |