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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 15 V. Qg 266 nC
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 15 V to UVLO Tonmax - s
Capacitance calculation formula
CB must not be discharged below to the upper limit of the UVLO - the maximum allowable on-time (Tonmax) of the upper
side is calculated as follows:
VBS * CB – Qg – IDmax * Tonmax = UVLO * CB
CB = (Qg + IDmax * Tonmax) / (VBS – UVLO)
The relationship between Tonmax 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 47 μF, however, the value needs to be verified prior to
production.
Tonmax-CB characteristic
Fig 15
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Package Dimensions
unit : mm
The tolerances of length are +/ 0.5 mm unless otherwise specified.
SIP22 70x31.1
CASE 127BU
ISSUE O
22
1
8C F 00
2.5
0.5
12.5
0.75
78
2 R2.3
3.5
±0.4
6
31.1
4.6
70
2.54
21 x 2.54 = 53.34
0.5
2 2
58
Missing pin : 3, 6, 9, 11
(16)
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Device Package Shipping (Qty / Packing)
STK581U3C2D-E
SIP22 70x31.1
(Pb-Free)
7 / Tube

STK581U3C2D-E

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ON Semiconductor
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