LV11961HA-AH データシートの表示（PDF） - ON Semiconductor

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LV11961HA-AH

FAN Motor Driver, Single-phase

ON Semiconductor 

LV11961HA

- Soft switching

This IC operates to switch the driving phase of

output softly by changing PWM duty gradually,

which is called Soft switching.

The term of Soft switching is 18.75% of FG

half cycle each before and after the time of

phase switching, as shown in Fig.4 with

details.

IN2

IN1

OUT1

OUT2

FG

TINH

TINL

Soft on

swi tch ing

PWM action

according to VTH level

Soft off

switchi ng

TINH x 18.75%

TINL x 18.75%

Soft on

swi tchi ng

PW M action

according to VTH level

Soft off

switchi ng

Soft on

swi tchi ng

TINL x 18.75%

TINH x18.75%

TINL x 18.75%

Fig.4

In case that output turns from PWM operation

to constant low side driving, PWM high duty

decreases by 12.5% of actual duty every

CPWM

12.5% of Soft switching term, as shown in

Fig.5.

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

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