Texas Instruments TPS54678 Evaluation Module TPS54678EVM-155 TPS54678EVM-155 데이터 시트
제품 코드
TPS54678EVM-155
Time - 100 µs/div
1 V/div
G014
200 mV /div
1
A/div
V
Falling/div
OUT
V /div
IN
I
, Inverted
OUT
for Clarity
Time - 100 µs/div
1 V/div
G013
200 mV /div
1
A/div
V
Falling/div
OUT
V /div
IN
I
, Inverted
OUT
for Clarity
Test Setup and Results
2.10 Powering Down
and
show the shut down waveforms for the EVM. In
, the output voltage
ramps down as soon as the input voltage falls below the UVLO stop threshold as set by the R1 and R2
resistor divider network. At the point of shutdown, the input voltage rises slightly due to the resistive drop
in the input feed impedance. In
resistor divider network. At the point of shutdown, the input voltage rises slightly due to the resistive drop
in the input feed impedance. In
, the output is inhibited by using a jumper at JP1 to tie EN to
GND.
Figure 14. TPS54678EVM-155 Shut-down Relative to V
IN
Figure 15. TPS54678EVM-155 Shut-down Relative to EN
2.11 Hiccup Mode Current Limit
The TPS54678 has hiccup mode current limit. When the peak switch current exceeds the current limit
threshold, the device shuts down and restarts. Hiccup mode current limit operation is shown in
threshold, the device shuts down and restarts. Hiccup mode current limit operation is shown in
and
shows the activation of hiccup mode current limit. When the peak current limit is
exceeded, the output voltage is disabled.
shows the operation of the TPS54678 with the output
shorted to ground. The device will continuously reset until the fault condition is removed.
12
TPS54678EVM-155 6-A, SWIFT™ Regulator Evaluation Module
SLVU747 – June 2012
Copyright © 2012, Texas Instruments Incorporated