LB1817M 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1817M

FDD Spindle Motor Driver

SANYO -> Panasonic 

Continued from preceding page.

Pin No. Symbol

14 I–

Pin voltage

15 I+

16 X1

LB1817M

Unit (resistance: Ω)

Equivalent circuit

Pin description

• External index negative input pin.

• External index positive input pin.

When the I– pin is at an “H” level, I1

operates with the fixed current; at an “L”

level, I1 does not flow.

Hysteresis width is determined by the

resistor attached externally to the I– pin.

• Reference clock generating pin.

17 X2

18 FC

19 RF

20 PGND

• Frequency characteristics revision pin

By installing a capacitor between this pin

and VCC, close-loop oscillation for the

current control system halts.

• Output current detection pin.

By installing an Rf resistor between this

pin and VCC, output current is detected as

voltage. Voltage detection at this pin

activates the current limiter.

Detection level is approximately 1/50 of

output current.

• Output transistor grounding pin.

Grounded as with pin 9.

Continued on next page.

No. 4355-6/9

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