Texas Instruments 6-17Vin, 5A Synchronous Buck Converter Module TPS54550EVM-158 TPS54550EVM-158 データシート
製品コード
TPS54550EVM-158
www.ti.com
2.7
Input Voltage Ripple
V
= 2 V/div
(PH)
V = 7 V, V
= 3.3 V, I
= 5 A, f = 700 kHz
I
O
O
S
V
= 100 mV/div (ac) coupled
I(Ripple
)
2.8
Powering Up
V = 5 V/div
I
V
= 2 V/div
O
Time - 5 ms/div
Test Setup and Results
The input voltage ripple is shown in
. The input voltage is VIN = 12 V for the TPS54550. Output
current for each device is at full rate TPS54550EVM-158 load of 5 A.
Figure 7. Input Voltage Ripple, TPS54550
The TPS54550EVM-158 start-up waveforms are shown in
. The top trace shows VIN whereas the
bottom trace shows OUT. Vin charges up from 0 V toward 12 V. When the input voltage reaches the
internally set UVLO threshold voltage, the slow-start sequence begins. After a delay, the internal reference
begins to ramp up linearly at the internally set slow-start rate towards 0.891 V, and the output ramps up
toward the set voltage of 5 V. The output may be inhibited by using a jumper at JP1 to tie EN to GND.
When the jumper is removed, EN is released and the slow-start voltage begins to ramp up at the internally
set rate. When the EN voltage reaches the enable-threshold voltage of 1.06 V, the start-up sequence
begins as described previously.
internally set UVLO threshold voltage, the slow-start sequence begins. After a delay, the internal reference
begins to ramp up linearly at the internally set slow-start rate towards 0.891 V, and the output ramps up
toward the set voltage of 5 V. The output may be inhibited by using a jumper at JP1 to tie EN to GND.
When the jumper is removed, EN is released and the slow-start voltage begins to ramp up at the internally
set rate. When the EN voltage reaches the enable-threshold voltage of 1.06 V, the start-up sequence
begins as described previously.
Figure 8. Power Up, OUT Relative to VIN
SLVU151 – March 2006
TPS54550EVM-158 SWIFT™ Regulator Evaluation Module
7