Texas Instruments TPS54678 Evaluation Module TPS54678EVM-155 TPS54678EVM-155 데이터 시트
제품 코드
TPS54678EVM-155
Time - 500 µs/div
1 V/div
G012
200 mV /div
V
/div
OUT
V /div
IN
Time - 500 µs/div
1 V/div
1
A/div
G011
200 mV /div
I
, Inverted for Clarity
OUT
V
/div
OUT
V /div
IN
Time - 500 µs/div
1 V/div
1
A/div
G010
200 mV /div
I
, Inverted for Clarity
OUT
V
/div
OUT
V /div
IN
Test Setup and Results
2.9
Powering Up
and
show the start-up waveforms for the EVM. In
, the output voltage ramps
up as soon as the input voltage reaches the UVLO threshold as set by the R1 and R2 resistor divider
network. In
network. In
, the input voltage is initially applied and the output is inhibited by using a jumper at
JP1 to tie EN to GND. When the jumper is removed, EN is released. When the EN voltage reaches the
enable-threshold voltage, the start-up sequence begins and the output voltage ramps up to the externally
set value of 1.2 V.
enable-threshold voltage, the start-up sequence begins and the output voltage ramps up to the externally
set value of 1.2 V.
Figure 11. TPS54678EVM-155 Start-Up Relative to V
IN
Figure 12. TPS54678EVM-155 Start-up Relative to Enable
The TPS54678 is designed to start up into pre-biased outputs.
shows the output voltage start up
waveform when the output is prebiased with 550 mV.
Figure 13. TPS54678EVM-155 Start-up into Pre-bias
11
SLVU747 – June 2012
TPS54678EVM-155 6-A, SWIFT™ Regulator Evaluation Module
Copyright © 2012, Texas Instruments Incorporated