STK551U362A-E データシートの表示（PDF） - ON Semiconductor

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STK551U362A-E

Intelligent Power Module (IPM) 600 V, 10 A

ON Semiconductor 

STK551U362A-E

CB capacitor value calculation for bootstrap circuit

Calculate condition

Item

Upper side power supply

Total gate charge of output power IGBT at 15 V

Upper side power supply low voltage protection

Upper side power dissipation

ON time required for CB voltage to fall from 15 V to UVLO

Symbol

Value

Unit

VBS

15

V

Qg

89

nC

UVLO

12

V

IDmax

400

μA

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) / (VBS – 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 47 μF, however, the value needs to be verified prior to

production.

Tonmax-Cb characteristic

Fig. 15

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