No. 5625-7/11

LB1872

Continued from preceding page.

Pin No.

Symbol

Pin function

Equivalent circuit

15

FC

Control amplifier frequency correction

Current limiter system closed loop oscillation can be prevented by

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.

16

EO

Error amplifier output

When high, the output current is increased.

Control

amplifier

17

EI

Error amplifier input

18

PD

Phase comparator output (PLL output)

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

The output current is increased as the duty becomes smaller.

19

CLD

LD output mask time setting

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.