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IP4011

5-CH MOTOR DRIVE IC

APPLICATION SUMMARY (Continued)

- Tray motor speed control

The amplitude of the output voltage is controlled by pin20(CTL).

Level

Shift

VCC1

20

Speed

Control

VCC

R

50k

50k

ZD

Normally, the differential output voltage is 3.1V when the pin20(CTL) is open.

If you want to control differential output voltage of the tray drive part, insert external resistor R and zener

diode ZD as shown in figure 6.

Zener diode ZD is only needed when you want to obtain a precision output voltage,

In other case you only insert an external resistor R.

Fig6. Tray motor speed control

- Regulator part

IP4011 has a temperature independent voltage source internally.

So in the figure 7, the reference voltage (2.5V) is generated by the internal circuit (bandgab reference).

6

Fig7. Regulator

Because the power NPN TR Q5 is inserted

internally, there is no need to attach

an external active component.

The output voltage of the regulator is

Calculated as follows

5V

=

2.5

x

)

3.3K

3.3K

+

(1

=

Vreo

And he capacitor 1uF is used as a ripple

& noise eliminator and should have a good

Temperature characteristics.

2.5V

VCC2

3.3K

103

Internal circuit

External circuit

3.3K

+

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