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STK5F1U3E3D-E Datasheet(PDF) 13 Page - ON Semiconductor

Part # STK5F1U3E3D-E
Description  Inverter Power IPM
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

STK5F1U3E3D-E Datasheet(HTML) 13 Page - ON Semiconductor

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13
CB capacitor value calculation for bootstrap circuit
Calculate condition
Item
Symbol
Value
Unit
Upper side power supply
VBS
15
V
Total gate charge of output power IGBT at 15V.
Qg
0.47
μC
Upper side power supply low voltage protection.
UVLO
12
V
Upper side power dissipation.
IDmax
400
μA
ON time required for CB voltage to fall from 15V to UVLO
Ton-max
-
s
Capacitance calculation formula
CB must not be discharged below to the upper limit of the UVLO - the maximum allowable on-time (Ton-max) of the
upper side is calculated as follows:
VBS
 CB – Qg – IDmax  Ton-max = UVLO  CB
CB = (Qg + IDmax
 Ton-max) / (VD – UVLO)
The relationship between Ton-max and CB becomes as follows. CB is recommended to be approximately 3 times the
value calculated above. The recommended value of CB is in the range of 1 to 47μF, however, the value needs to be
verified prior to production.
Fig.16 Ton-max vs CB characteristic
0.01
0.1
1
10
100
0.1
1
10
100
1000
ton max (ms)
Cb vs ton max


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