LB11923V-MPB-E データシートの表示（PDF） - ON Semiconductor

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LB11923V-MPB-E

Three-Phase Brushless Motor Driver

ON Semiconductor 

LB11923V

possible, since the values of the R pin external

resistor (R) and the C pin external capacitor (C)

are determined by the maximum value of the

reference signal frequency (fVCO1) and the

minimum value (VCCL) of the VCC power supply

due to unit-to-unit variations, R and C can be

determined using the following procedure as

a reference.

(1)Calculate R1 and C1 using the following

formulas and determine values for R and C

such that the conditions R ≤ R1 and C ≤ C1 will

hold taking the sample-to-sample variations

(including other issues such as temperature

characteristics) into account.

R1 + (VCC * 2.2 V)

280 mA

(eq. 8)

280 mA

C1 +

1

0.7

0.9 V fVCOL

(eq. 9)

(2)The minimum value (fVCO2) for the reference

signal frequency that can be set for the R and C

values determined in step (1) can be calculated

from the following formula if we let R2 and C2

be the smallest values for R and C due to the

sample-to-sample variations (including other

issues such as temperature characteristics).

Therefore, the range over which the reference

signal frequency can be set is fVCO1 to fVCO2.

fVCO2

+

0.38

R2 C2

(eq. 10)

(3)The following are the conditions that must be

met and the points that require care when

determining the values of the external

components connected to the R and C pins.

a. The maximum value of the set reference

signal frequency must not exceed 1 MHz.

b. The R pin voltage and the FIL pin voltage

must be in the range 0.3 V to (VCCL –

2.2 V). (VCCL is the lowest value of the VCC

supply voltage given the unit-to-unit

variations. VCCL is always greater than or

equal to 4.4 V.) However, the lower the R

pin voltage, the more susceptible the system

will be to ground line noise, and the

reference signal frequency may become

unstable as a result. Therefore the lower end

of the R pin voltage range must not be used

if there is much ground line noise in the

system.

c. Set the value of the R pin external resistor to

a value in the range 6.8 kW to 15 kW. Also,

assure that the R pin current remains under

280 mA.

d. Set the value of the C pin external capacitor

to a value in the range 150 pF to 1000 pF.

e. When it is desirable to make the range of the

reference signal frequency as wide as

possible, set the values of R and C to the

largest possible values. (However, those

values must be lower than the calculated

values R1 and C1.) Use components with the

smallest sample-to-sample variations

possible. The VCC voltage must be made as

much higher than 5 V as possible by, for

example, using this IC’s VREG pin

(7 V shunt regulator), to acquire the widest

possible range for the reference signal

frequency.

20. NC Pin:

Since the NC pins are electrically open with

respect to the IC itself, they can be used as

intermediate connection points for lines in the

PCB pattern.

ORDERING INFORMATION

Device

Package

Wire Bond

Shipping† (Qty / Packing)

LB11923V−TLM−E

SSOP44 (275mil)

(Pb−Free)

Au−wire

2,000 / Tape & Reel

LB11923V−A−TLM−E

SSOP44 (275mil)

(Pb−Free)

Au−wire

2,000 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

www.onsemi.com

20

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