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TYPICAL APPLICATIONS
PROTECTION AND DIAGNOSIS FEATURES
Figure 19. Power Dissipation Profile of Application Using Charge Pump
Reference application with:
? Pump capacitor: 1 μ F MLC
? Pump filter capacitor: 47 μ F low ESR aluminum electrolytic
? Pump diodes: MUR120
? Output FET gate charge: 240 nC @ 10V
? PWM Frequency: 20kHz
? Switching Single Phase
Below approximately 17V the charge pump is actively regulating Vpwr. The increased power dissipation is due to the charge
pump losses. Above this voltage the charge pump oscillator shuts down and Vbat is passed through the pump diodes directly to
Vpwr.
33927
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
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