Datasheet
HS LS
Vout 0.8V
R = R
0.8 V
-
æ ö
´
ç ÷
è ø
Introduction
www.ti.com
Table 2. TPS54340EVM-182 Performance Specification Summary
Specification Test Conditions MIN TYP MAX Unit
V
IN
voltage range 6 12 42 V
Output voltage set point 3.3 V
Output current range V
IN
= 6 V to 42 V 0 3.5 A
Line regulation I
OUT
= 3.5 A, V
IN
= 6 V to 42 V ±0.3%
Load regulation V
IN
= 12 V, I
OUT
= 0.001 A to 3.5 A ±0.6%
Voltage change –140 mV
I
OUT
= 0.875 A to 2.625 A
Recovery time 300 µs
Load transient response
Voltage change 140 mV
I
OUT
= 2.625 A to 0.875 A
Recovery time 300 µs
Loop bandwidth V
IN
= 12 V, I
OUT
= 3.5 A 39 kHz
Phase margin V
IN
= 12 V, I
OUT
= 3.5 A 59 °
Input voltage ripple I
OUT
= 3.5 A 300 mVpp
Output voltage ripple I
OUT
= 3.5 A 10 mVpp
Output rise time 2 ms
Operating frequency 600 kHz
Maximum efficiency TPS54340EVM-182, V
IN
= 12 V, I
OUT
= 1.1 A 88%
DCM threshold V
IN
= 12 V 342 mA
Pulse skipping threshold V
IN
= 12 V 31 mA
No load input current V
IN
= 12 V 237 µA
UVLO start threshold 5.75 V
UVLO stop threshold 4.5 V
1.3 Modifications
These evaluation modules are designed to provide access to the features of the TPS54340. Some
modifications can be made to this module.
1.3.1 Output Voltage Set Point
To change the output voltage of the EVM, it is necessary to change the value of resistor R5. Changing the
value of R5 can change the output voltage above 0.8 V. The value of R5 for a specific output voltage can
be calculated using Equation 1, where R
HS
is R5 and R
LS
is R6.
(1)
Table 3 lists the R5 values for some common output voltages assuming R6 = 10.2 kΩ. Note V
IN
must be in
a range so the minimum on-time is greater than 135 ns. The values given in Table 3 are standard 1%
values, not the exact value calculated using Equation 1.
Table 3. R5 Values for Common Output Voltages
Output Voltage (V) R5 Value (kΩ)
1.8 12.7
2.5 21.5
3.3 31.6
5.0 53.6
4
Using the TPS54340 Step-Down Converter Evaluation Module SLVU794A–October 2012–Revised February 2013
Submit Documentation Feedback
Copyright © 2012–2013, Texas Instruments Incorporated