Texas Instruments Evaluation Module for TPS74001DGK TPS74001DGKEVM-722 TPS74001DGKEVM-722 Datenbogen
Produktcode
TPS74001DGKEVM-722
V
V
A
Power
Supply
#1
V
A
RL
Power
Supply
#2
OUT
R1
V
0.9
1
R2
æ
ö
=
´
+
ç
÷
è
ø
Operation
Figure 2. Quick-Start Connection Setup
4
Operation
This section provides information about the operation of the TPS740xxDGK EVM and expected outputs.
The TPS740xx parts can support input voltages (V
The TPS740xx parts can support input voltages (V
IN
) between 1.2 V and 5.5 V and output voltages (V
OUT
)
between 0.9 V and 4 V. A separate V
BIAS
input supply (3 V to 5.5 V) powers the error amplifier, reference,
and internal control circuits to allow for very low main input supply voltage. The TPS740xx requires only a
small output ceramic capacitor of 2.2
small output ceramic capacitor of 2.2
µ
F (minimum) to ensure stability of the IC.
4.1
Adjustable Output Voltage
TPS74001DGK EVM comes configured for a 1.5-V output voltage. However, this output voltage can easily
be modified to range between 0.9 V and 4 V by changing the values of the resistors R
be modified to range between 0.9 V and 4 V by changing the values of the resistors R
1
and R
2
that form a
voltage divider at the output of the IC. In order to achieve maximum accuracy, R
2
is recommended to be
lower than 4.99 k
Ω
. Proper values for R
1
and R
2
for a desired V
OUT
can be calculated using:
(1)
Sample resistor values of common output voltages are shown in
.
Table 2. Sample Resistor Values for Common Output Voltages for
TPS74001DGK
R
1
[k
Ω
]
R
2
[k
Ω
]
VOUT [V]
Short
Open
0.9
0.562
5.11
1
0.75
4.53
1.05
4
TPS740xxDGKEVM-722 Evaluation Module
SLVU475A
–
June 2011
–
Revised June 2011
Copyright
©
2011, Texas Instruments Incorporated