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MC33680

Dual DC−DC Regulator for Electronic Organizer

ON Semiconductor 

MC33680

20 uS / div

1: VMAIN = 3.3 V (50 mV/div, AC COUPLED)

2: Voltage at VMAINSW (1 V/div)

Figure 12. VMAIN 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 13. VMAIN Output Ripple (Heavy Load)

20 uS / div

1: VAUX = 20 V (50 mV/div, AC COUPLED)

2: Voltage at VAUXSW (10 V/div)

Figure 14. VAUX Output Ripple (Medium Load)

10 uS / div

1: VAUX = 20 V (50 mV/div, AC COUPLED)

2: Voltage at VAUXSW (10 V/div)

Figure 15. VAUX Output Ripple (Heavy Load)

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)

Figure 16. VMAIN Startup and Power−Good Signal

5 mS / div

1: VAUX from 1.8 V to 20 V (5 V/div)

2: VAUXEN (2 V/div)

Figure 17. VAUX Startup

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