Datasheet

( )
EN falling
Stop EN falling p h
UVLO Bottom Resist
R6 V
R11 
V V R6 I
or
I
´
=
- + ´ +
Test Setup and Results www.ti.com
(4)
Where:
Variable Description Nominal Value
V
Start
Desired start voltage As desired, but must be greater than 4.4 V
V
Stop
Desired stop voltage As desired, but must be greater than 4.2 V
V
EN
falling Enable pin stop threshold voltage 1.17-V nominal
V
EN
rising Enable pin start threshold voltage 1.21-V nominal
I
p
Enable pin source current while OFF 1.15-µA nominal
I
h
Enable pin hysteresis current 2.15-µA nominal
1.3.4 Input Voltage Rails
The EVM is designed to accommodate different input voltage levels for the power stage and control logic.
For most applications, the PVIN and V
IN
inputs are connected together using a jumper across J2. When
V
IN
is connected to PVIN, only 1 input voltage is required and is supplied at J1. If desired, these two input
voltage rails may be separated by removing the jumper across J2. 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 EVM. The section also includes test
results typical for the EVM and includes efficiency, output voltage regulation, load transients, loop
response, output ripple, input ripple, and start-up.
2.1 Input / Output Connections
The EVM is provided with input/output connectors and test points as shown in Table 4. A power supply
capable of supplying 5 A must be connected to J1, and a pair of 20-AWG wires is recommended. The
jumper across J2 must be in place across pins 1 and 2. See Section 1.3.4 for split-input voltage rail
operation. The load must be connected to J3 and a pair of 20-AWG wires is recommended. The load must
be capable of drawing 10 A at 1.8 V. Wire lengths should be minimized to reduce losses in the wires.
Test-point TP1 provides a place to monitor the PVIN input voltages with TP6 providing a convenient
ground reference. TP5 is used to monitor the output voltage with TP8 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 PVIN to VIN jumper. Shunt SH1 is normally connected from pin 1 to pin 2 to tie VIN to PVIN for common
rail voltage operation.
J3 VOUT, 1.8 V at 10-A maximum.
J4 V
IN
input voltage connector. Not normally used.
J5 2-pin header for enable. Connect EN to ground to disable, open to enable.
J6 2-pin header used to for sequencing via the slow start voltage.
TP1 Test point for PVIN.
TP2 Test point for Power Good. Biased from V
OUT
.
TP3 Test point for SYNC OUT. In RT mode, this is a clock output. In SYNC mode, this is a digital input.
TP4 Test point for V
IN
.
TP5 Test point for V
OUT
.
TP6 Test point for PGND, near input.
TP7 Test point for PH, or Switch Node.
4
TPS54020EVM-082 Evaluation Module (PWR082) SLVU777–September 2012
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