MC34280 Datasheet, PDF (9/20 Pages) ON Semiconductor – Power Supply & Management IC for Handheld Electronic Products

MC34280
Figure 14. VMAIN Output Ripple (Medium Load)
Figure 15. VMAIN Output Ripple (Heavy Load)
20 uS / div
1: VMAIN = 3.3 V (50 mV/div, AC COUPLED)
2: Voltage at VMAINSW (1 V/div)
Figure 16. VAUX Output Ripple (Medium Load)
10 uS / div
1: VMAIN = 3.3 V (50 mV/div, AC COUPLED)
2: Voltage at VMAINSW (1 V/div)
Figure 17. VAUX Output Ripple (Heavy Load)
20 uS / div
1: VAUX = 20 V (50 mV/div, AC COUPLED)
2: Voltage at VAUXSW (10 V/div)
Figure 18. VMAIN Startup and Power–On Reset
10 uS / div
1: VAUX = 20 V (50 mV/div, AC COUPLED)
2: Voltage at VAUXSW (10 V/div)
Figure 19. VAUX Startup
50 mS / div
1: VMAIN from 1 V to 3.3 V (1 V/div)
2: Voltage of PORB (2 V/div)
3: Voltage of ENABLE (2 V/div)
5 mS / div
1: VAUX from 1.8 V to 20 V (5 V/div)
2: VAUXEN (2 V/div)
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