LB1872 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1872

Polygon Mirror Scanner Driver IC

SANYO -> Panasonic 

Continued from preceding page.

Pin No. Symbol

LB1872

Pin function

Control amplifier frequency correction

Current limiter system closed loop oscillation can be prevented by

15

FC inserting a capacitor (about 0.022 to 0.47 µF) between this pin and

ground. If the capacitance of this capacitor is too large, the output

current response characteristics may be degraded.

Equivalent circuit

Error amplifier output

16

EO

When high, the output current is increased.

Control

amplifier

17

EI Error amplifier input

Phase comparator output (PLL output)

18

PD The phase error is output as changes in the duty of a pulse waveform.

The output current is increased as the duty becomes smaller.

LD output mask time setting

19

CLD Chattering can be masked by inserting a capacitor (about 0.1 to 0.47

µF) between this pin and ground. The startup time may be increased if

only masking is used and the servo constants are not re-optimized.

Continued on next page.

No. 5625-7/11

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