LB1955 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1955

Three-Phase Brushless Motor Driver

SANYO -> Panasonic 

VG and LIM Pin Usage

Output

stage

LB1955

LIM pin: Open

VG – Rf: Shorted

Gm = 0.423/Rf (A/V)

(Closed loop control gain)

Ilim = (VREF × 27/200 – 0.2) × 4.23/3/Rf

(Current limit)

VG pin: Open

Gm = 1/Rf (A/V)

(Closed loop control gain)

Ilim = (VREF ×27/200 – 0.2) ×10/3/Rf

(Current limit)

LIM – VREF: Shorted

No current limit.

Note: This current limiting function is for protection against unusual and abnormal currents. If a current limit level below the rated current is set, this will,

inversely, result in heat generation within the IC.

When the LIM pin is open, VG is shorted to Rf, and Rf = 0.47 Ω, this will result in a current limit level of about 1.3 to 1.4 A. If this limit falls under the

rated value due to mode changes or changes in the value of the Rf resistor, set the current limit to an appropriate value by applying to the LIM pin a

voltage that is divided from the VREF to ground potential by resistors of a few kΩ. Alternatively, short the LIM pin to VREF to defeat the current limit

function.

PG and FG Pin Output Circuits

FG (FGR shorted to ground)

PG (FGR shorted to PG)

No. 5452-5/7

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