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IP4001

5-CH MOTOR DRIVE IC

APPLICATION SUMMARY

- Reference & all mute

When you want to control output bias current of the IP4001, use pin #23 as follows

Pin#23

Mute

Above1.0V

off

Below 1.0V

on

All Output

Driver Bias

VCC2

23

Q1

1V

30k

- Mute

When you want to control output bias current of the IP4001, you can also use pin#7 as follows

All Output

Driver Bias

VCC2

20k

20k

7

Q2

Q3

Pin#7

Mute

High

off

Low

on

Fig1. Reference & all mute function

Fig2. Mute function

As shown in figure 1,

Pin#23 is a negative input of the comparator,

and the other Input is the 1.0V reference.

If the voltage of the pin#23 falls below 1.0V,

TR Q1 will be turned on and the output bias current

will be shut down

As shown in figure 2,

Pin#7 is a base input of the TR Q2.

If the voltage of the pin#7 is low or open,

TR Q2 will be turned off and TR Q3 will be turned on,

so the bias current will be shut down by TR Q3.

If the voltage of the pin#7 is high,

the bias circuit operates normally.