Texas Instruments Evaluation Module for TPS54120 1A Power Supply w/ Integrated DC-DC Converter & Low-Dropout Regulator T TPS54120EVM-103 데이터 시트
제품 코드
TPS54120EVM-103
0.01
0.1
1
10
10
100
1000
10000
100000
1000000
10000000
f - Frequency - Hz
Output Spectral Noise Density (
V/SQRT(Hz))
m
V
= 12 V, V
= 3.3 V,
C
= 100 F, C
= 0.1 F,
I
= 400 mA, F
= 480 kHz,
L1 = 22 H
IN
OUT
OUT
NR
OUT
SW
m
m
m
Test Results
4.1
Output Voltage Ripple
shows the output voltage ripple of the LDO and SWITCHER converter for the TPS54120EVM
with Vin = 12V, SW OUT = 4.1V, LDO OUT = 3.3V, Iout = 400mA, Fswitching = 480kHz.
Figure 1. Output Voltage of Both the SW and LDO with 400mA Load
4.2
Output Noise
shows the output voltage noise spectrum for the TPS54120EVM with Vin = 12V, LDO OUT =
3.3V, SW OUT = 4.1V, Iout = 400mA, Fswitching = 480kHz.
Figure 2. Output Spectrum Noise Density vs. Frequency
5
SLVU641
–
January 2012
TPS54120EVM, Low Noise 1A Power Supply Evaluation Module
Copyright
©
2012, Texas Instruments Incorporated