STK551U362A-E(2013) データシートの表示（PDF） - ON Semiconductor

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STK551U362A-E
(Rev.:2013)

Inverter Power H-IC for 3-phase Motor Drive

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 15V.

Upper side power supply low voltage protection.

Upper side power dissipation.

ON time required for CB voltage to fall from 15V 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 47μF, however, the value needs to be verified prior to production.

Tonmax-Cb characteristic

Fig 15

No.A2210-13/15

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