IP9001

4-CH MOTOR DRIVE IC FOR PORTABLE CDP

- 13 -

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APPLICATION SUMMARY (Continued)

- Voltage gain of each channel

4-CH input resistances are as follows,

CH1, CH3, CH4 : 11K ohm

CH2

: 7.5K ohm

So, the voltage gain is calculated as following equation.

55

134

20 log ||

11

K

GV

RK

=

+

110

2

20 log ||

7.5

K

GV

RK

=

+

* R is an external resistor which is connected to input pins (pin17,18,20,22)

- Power supply voltage

IP9001 has two kinds of power supply pins. One is power supply for output stage(pin36), the others are

signal power supply for pre driver(pin12, pin15). All power supply pins should be attached by-pass capacitor

with each other.

- Output voltage

IP9001 has internal buck/boost control circuit and the output voltage is calculated as follows,

Figure1. output voltage set up method

13

13

1

(1)

24

24

RR

RR

V C C

V ref

RR

RR

×

+

=

×+

×

+

* vref =1.2V

* R1 : External resistor

* R2 : External resistor

* R3 : 35K ohm

* R4 : 21K ohm

3

35

1

(1

)

1.2 (1

)

3.2

4

21

RK

VCC default

VrefV

RK

=

× +

=

× +=

If there is no external resistor,

Then default VCC1 value is as follows,

2. DC/DC converter