AD6392 데이터 시트보기 (PDF) - Unspecified

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AD6392

4-CH MOTOR DRIVE IC

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AD6392

4-CH MOTOR DRIVE IC

APPLICATION SUMMARY (Continued)

- CH4 spindle drive part

CH4 drive part is composed V-I converter and output power amplifiers.

V-I converter

Output Power AMP

Fig. 7 CH4 spindle drive part

- The V-I converter converts the input voltage applied to pin24 into a incremental output current given

by

di = Vin - Vref = Vin

100K 100K

Vin = Vin - Vref

* Vin = input voltage of pin24

*Vref = reference voltage (pin23 or pin25)

- These sourcing and sinking output current from V-I converter are delivered to output power amplifiers,

where they are appeared as differential output voltages given as:

DOF = Pref + di *170K

DOR = Pref − di *170K

- The differential voltage gain is, then, calculated as follows:

Vout = DOF - DOR = 2 * di *170K

Avf = 20log DVout = 20log 2 *170K = 10.6dB

DVin

100K

April. 2002 (Rev.0)

www.interpionsemi.com

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