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BD7755RFV-E2 Datasheet(PDF) 11 Page - Rohm |
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BD7755RFV-E2 Datasheet(HTML) 11 Page - Rohm |
11 / 21 page Technical Note 11/18 www.rohm.com 2010.06 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. BD7755RFV 6. Protect system 1 It is a function to mute the actuator outputs when the IC outputs the current more than the setting threshold value IPRTLIM for 1.2sec because of the protection for the focus, the tracking, and the tilt coil. Outputs are muted similarly when the output current of two or three CHs continuously exceed the threshold for 1.2sec. It returns to normal operation by setting CTL2=L. IPRTLIM = A RPRTLIM(Ω) (A) A = 8750 PRTFLG(OUTPUT) Actuator output (FCO/TKO/TLO) H OFF L active MIN. TYP. MAX. Unit Time until protection function operates 1.0 1.2 1.4 s Current between FCO outputs 0 Current between TLO outputs Current between TKO outputs CTL2 0 0 Low High FCIN1 0 Current between FCO outputs Current between TLO outputs Current between TKO outputs CTL2 0 FCIN1 0 0 threshold current 0 threshold current Low High threshold current threshold current threshold current threshold current 1.2sec mute 1.2sec mute reset 7. Protect system 2 Function to protect against destruction of output terminal when output pin connects to GND or Vcc. PRTFLG(OUTPUT) Spindle, Sled motor driver output H OFF L active ・Spindle, Sled motor ・When SINK side POWER transistor has been turned on, if the output voltage (SPVM/2&SLVM/2<TYP> or more) are detected, the channel concerned will be turned off. ・When SOURCE side POWER transistor has been turned on, if the output voltage (SPVM/2&SLVM/2<TYP> or less ) are detected, the channel concerned will be turned off. |
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