Datasheet

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1.3.5 Input Voltage Rails
The EVM is designed to accommodate different input voltage levels for the power stage and control logic.
During normal operation, the PVIN and VIN inputs are connected using a jumper across J5. The single
input voltage is supplied at J1. If desired, these two input voltage rails may be separated by removing the
jumper across J5. Two input voltages must then be provided at both J1 and J4.
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54622EVM-012 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.
2.1 Input/Output Connections
The TPS54622EVM-012 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 4 A must be connected to J1 through a pair of 20 AWG wires. The
jumper across J5 must be in place. See Section 1.3.5 for split-input voltage rail operation. The load must
be connected to J2 through a pair of 20 AWG wires. The maximum load current capability must be 6 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. TP3 is used to monitor the output
voltage with TP5 as the ground reference.
Table 4. EVM Connectors and Test Points
Reference Designator Function
J1 PVIN input voltage connector. (See Table 1 for V
IN
range.)
J2 V
OUT
, 3.3 V at 6 A maximum.
J3 2-pin header for enable. Connect EN to ground to disable, open to enable.
J4 VIN input voltage connector. Not normally used.
J5 PVIN to VIN jumper. Normally closed to tie VIN to PVIN for common rail voltage operation.
J6 2-pin header for tracking voltage input and ground.
J7 2-pin header for tracking output and ground.
TP1 PVIN test point at PVIN connector.
TP2 GND test point at PVIN connector.
TP3 Output voltage test point at VOUT connector.
TP4 PH test point.
TP5 GND test point at VOUT connector.
Test point between voltage divider network and output. Used for loop response measurements. Slow
TP6
start/track in test point.
TP7 COMP pin test point.
TP8 VIN test point at VIN connector.
TP9 GND test point at VIN connector.
2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 2 A and then decreases as the load current
increases toward full load. Figure 1 shows the efficiency for the TPS54622EVM-012 at an ambient
temperature of 25°C.
4
TPS54622EVM-012, 6-A, SWIFT™ Regulator— Evaluation Module SLVU441A–May 2011–Revised September 2011
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