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This user's guide contains background information for the TPS54521, as well as support documentation for the TPS54521EVM-607 evaluation module (HPA607). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54521EVM-607.
The TPS54521 dc/dc converter is designed to provide up to a 5 A output. The TPS54521 implements split input power rails with separate input voltage inputs for the power stage and control circuitry. The power stage input (PVIN) is rated for 1.6 V to 17 V while the control input (VIN) is rated for 4.5 to 17 V. The TPS54521EVM-607 provides both inputs but is designed and tested using the PVIN connected to VIN. Rated input voltage and output current range for the evaluation module are given in Table 1-1. This evaluation module demonstrates a low cost design that may be achieved when designing with the TPS54521 regulator. The switching frequency is externally set at a nominal 480 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54521 package along with the gate drive circuitry. The compensation components are external to the integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54521 provides adjustable slow start, tracking and undervoltage lockout inputs. The absolute maximum input voltage is 20 V for the TPS54521EVM-607.
EVM | INPUT VOLTAGE RANGE | OUTPUT CURRENT RANGE |
---|---|---|
TPS54521EVM-607 | VIN = 8 V to 17 V (VIN start voltage = 6.806 V) | 0 A to 5 A |
A summary of the TPS54521EVM-607 performance specifications is provided in Table 1-2. Specifications are given for an input voltage of 12 V and an output voltage of 3.3 V, unless otherwise specified. The TPS54521EVM-607 is designed and tested for VIN = 8 V to 17 V with the VIN and PVIN pins connected together with the JP1 jumper. The ambient temperature is 25°C for all measurements, unless otherwise noted.
SPECIFICATION | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
VIN voltage range (PVIN = VIN) | 8 | 12 | 17 | V | |||
VIN start voltage | 6.806 | V | |||||
VIN stop voltage | 4.824 | V | |||||
Output voltage set point | 3.3 | V | |||||
Output current range | VIN = 8 V to 17 V | 0 | 5 | A | |||
Line regulation | IO = 5 A, VIN = 8 V to 17 V | ±0.04% | |||||
Load regulation | VIN = 12 V, IO = 0 A to 5 A | ±0.05% | |||||
Load transient response | IO = 2 A to 4 A | Voltage change | 150 | mV | |||
Recovery time | 6 | μs | |||||
IO = 4 A to 2 A | Voltage change | 125 | mV | ||||
Recovery time | 6 | μs | |||||
Loop bandwidth | VIN = 12 V, IO = 5 A | 42 | kHz | ||||
Phase margin | VIN = 12 V , IO = 5 A | 62 | ° | ||||
Input ripple voltage | VIN = 12 V, IO = 5 A | 500 | mVPP | ||||
Output ripple voltage | VIN = 12 V, IO = 5 A | 75 | mVPP | ||||
Output rise time | 3.5 | ms | |||||
Operating frequency | 480 | kHz | |||||
Maximum efficiency | TPS54521EVM-607, VIN = 8 V, IO = 1.1 A | 94.5% |