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FAN8742MTFX Scheda tecnica(PDF) 15 Page - Fairchild Semiconductor |
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FAN8742MTFX Scheda tecnica(HTML) 15 Page - Fairchild Semiconductor |
15 / 23 page 15 www.fairchildsemi.com FAN8741/FAN8742 Rev. 1.0.1 3. Channel 1~4 Schematic • The reference voltage(ref) is given externally through pin21. • The input OP-amp output signal is amplified by (20K/10K) times and then fed to the power amplifier. The gain of power amplifier is 4 so the total max gain of channels 1 through 4 is 8. 4. Mute Inputs FAN8741 has 2 independent mute pins: Pin #22(MUTE1) and Pin #23(MUTE2). Details are shown below. Note: To make the spindle short brake, MUTE2 goes low and the spindle command must not be in deadzone(±50mV). When the spindle command is within the deadzone, the spindle block enters disable mode even though MUTE2 is low. MUTE1 MUTE2 SPIN- DLE SLED CH1/2/3 CH4(typ. load- ing driver) SPINDLE brake type H H Enable Disable Reverse brake when SPIN<VREF H L Enable Disable Short brake SPIN ≠ VREF(note) L H Disable Enable Disable Enable - LL Disable - 20k 10k ref power amp M Command |
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