GE Industrial Solutions Zephyr Non-Isolated SMT - Manual (Page 11)

Zephyr Non-Isolated SMT DC-DC Power Module:
0.8V to 3.5V @ 20A Output, 5V to 12V Input
Data Sheet
March 31, 2010
V OUT , 10 mV/div V OUT , 10 mV/div
0.5
μs/div
0.5
μs/div
Figure 19. Output Voltage Ripple and Noise: Figure 20. Output Voltage Ripple and Noise:
V
IN
= 5V, V
OUT
= 0.8V, 16A static load V
IN
= 5V, V
OUT
= 3.3V, 16A static load
Input Voltage Ripple and Noise
1
μF Ceramic Cap.
Trace Inductance
Zephyr Module
Power
Source
1000
μF Electrolytic Cap. Load
Figure 21. Test Circuit for Input Voltage Ripple and Noise Measurement
Figures 22 – 25 represent input voltage ripple and noise, measured at the input pins of the system board at
characteristic input and output voltages with 200 MHz bandwidth, under 16A constant current load. The
measurement was made using 50
Ω coax cable terminated with 50Ω at the oscilloscope. The input
capacitance consists of two Nichicon PL electrolytic capacitors, 1000
μF/16V each. The printed wiring board
(PWB) trace inductance is 2.1 nH. A ceramic capacitor of 1
μF is attached to the measurement point (input
pins on the system board, see Figure 21).
LINEAGE POWER 11