SI9124 Datasheet, PDF (14/16 Pages) Vishay Siliconix – 500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control

Si9124
Vishay Siliconix
TYPICAL WAVEFORMS
New Product
Figure 8. Over Current Hiccup (CS2 = 200 mV)
OUT_A 20 V/div
OUT_B 20 V/div
V_CC = 12 V
CS2 100 mV/div
GND
SS 1 V/div
C_SS = 22 nF
200 ms/div
Figure 9. Over Current Hiccup Cycle
OUT_A 20 V/div
OUT_B 20 V/div
V_CC = 12 V
CS2 100 mV/div
SS 1 V/div
C_SS = 22 nF
200 ms/div
Figure 10. Pre-Regulator Start-Up
10 V/div
V_INEXT
V_CC
2 ms/div
Figure 11. Operating Driver Waveforms
OUT_A 5 V/div
V_CC = 12 V
SEC_SYNC
5 V/div
OUT_B 5 V/div
500 ns/div
Figure 12. SEC_SYNC Set-Up Time (t_d3, t_d4)
OUT_A 5 V/div
V_CC = 12 V
Figure 13. SEC_SYNC Set-Up Time (t_d1, t_d2)
SEC_SYNC
5 V/div
V_CC = 12 V
SEC_SYNC
5 V/div
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14
100 ns/div
OUT_B 5 V/div
100 ns/div
Document Number: 72099
S-03638—Rev. B, 20-Mar-03