LV11961HA-AH 데이터 시트보기 (PDF) - ON Semiconductor

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LV11961HA-AH

FAN Motor Driver, Single-phase

ON Semiconductor 

LV11961HA

Functional description

- Start Up

In the condition that VTH and RMI level is

higher than VCPWM level continuously

over 1.5ms (typical), IC is in the sleep

mode. Once VTH level is lower than

VCPWM level, IC turns to be active and

goes into the Start-up mode.

In the Start-up mode, PWM duty of OUT1

and 2 in start-up operation is decided by

SFS level.

By connecting a capacitor between SFS

pin and SGND, the voltage of SFS pin

begins to increase soon after IC booting.

After IC booting, PWM output is in the mode

of ...

Driving ( under the condition of SFS >

CPWM in the charging period of CPWM )

Regenerating ( the discharging period of

CPWM and under the condition of SFS <

CPWM in the charging period of CPWM )

The higher the voltage of SFS pin is, the

larger the driving duty is. So, the driving

current increases softly according to the

increment of SFS level, as shown in Fig.1.

This function is available not only in IC

booting but in restart from lock protection.

VCC

REG

CPWM

SFS

OUT

0.4V(typ)

…Inner clamp level at SFS

2.15V(typ)

(=VREG x 69%)

0.62V(typ)

(=VREG x 20%)

OFF

PWM duty increasing

Fig.1

The motor should begin to rotate by the

increment of driving duty. After 8th FG edge

from IC booting or restart, the control of

PWM duty in outputs swithes from SFS

level to VTH level, as shown in Fig.2.

Clamped duty

(=50%(typ))

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