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33937 Datasheet(PDF) 43 Page - Freescale Semiconductor, Inc

Part # 33937
Description  Three Phase Field Effect Transistor Pre-driver
PDF  48 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33937 Datasheet(HTML) 43 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
43
33937
TYPICAL APPLICATIONS
PROTECTION AND DIAGNOSIS FEATURES
Figure 24. Power Dissipation Profile of Application Using Charge Pump
Reference application with:
• Pump capacitor: 1.0
μF MLC
• Pump filter capacitor: 47
μF low ESR aluminum electrolytic
• Pump diodes: MUR120
• Output FET gate charge: 240 nC @ 10 V
• PWM Frequency: 20 kHz
• Switching Single Phase
Below approximately 17 V 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 VSYS is passed through the pump diodes directly to
VPWR.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
5
1015
20
2530
3540
Supply Voltage (V)



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