LV11961HA-AH_15 데이터 시트보기 (PDF) - ON Semiconductor

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LV11961HA-AH_15

Single-phase FAN Motor Driver

ON Semiconductor 

LV11961HA

In case that output turns from PWM operation to constant low side driving, PWM high duty decreases by

12.5% of actual duty every 12.5% of Soft switching term, as shown in Fig.5.

CPWM

VTH TPWM

(PWM)

TDH TPWM

TPWM

OUT

TDH

TDH x 87.5% TDH x 75% TDH x 62.5% TDH x 50% TDH x 37.5% TDH x 25% TDH x 12.5% TDH x 0%

TSSD

TSSD

(= TSSW x 12.5%)

Term of PWM action

according to VTH level

TSSD

TSSD

TSSD

TINH(L) x 18.75% = TSSW

Term of Soft off switching

TSSD

TSSD

TSSD

Point of phase switching

Fig.5

Similarly in case that output turns from constant low side driving to PWM operation, PWM high duty

increases by 12.5% of actual duty every 12.5% of Soft switching term. However fixed regenerating term is

inserted in 300 usec(typ) after phase switching, as shown in Fig.6.

CPWM

VTH

TPWM

(PWM)

TDH TPWM

TPWM

OUT

(TDH x 0%) (TDH x 12.5%) TDH x 25% TDH x 37.5% TDH x 50% TDH x 62.5% TDH x 75% TDH x 87.5%

TDH

TSSD

TSSD

(= TSSW x 12.5%)

Fixed regenerating term

( =300usec(typ) )

TSSD

Point of phase switching

TSSD

TSSD

TINH(L) x 18.75% = TSSW

Term of Soft off switching

Fig.6

TSSD

TSSD

TSSD

Term of PWM action

according to VTH level

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