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LB1860-E Fiches technique(PDF) 3 Page - ON Semiconductor

No de pièce LB1860-E
Description  Two-Phase Half-Wave Variable Speed Fan Motor Driver
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LB1860-E Fiches technique(HTML) 3 Page - ON Semiconductor

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Block Diagram and Application Circuit
Truth Table
(
): LB1860M, 1861M
IN
+
IN
Ct
Rt1
Rt2
CR
OUT1
OUT2
RD
Mode
H
L
H
L
L
H
L
L
Full speed
L
H
H
L
L
L
H
L
Full speed
(H)
(L)
(H)
(L)
(H)
(L)
(L)
(Full speed)
(L)
(H)
(H)
(L)
(L)
(H)
(L)
(Full speed)
L
H
L
L
H
H
L
Low speed
—————
HHHH
Lock protection
Designer’s Notes
(1) Variable-speed circuit (Rt and Ct pins) — Refer to the application circuit diagram
.
The time constant gained by external components C2 and R2 is used to set the length of an ‘off’ operation time period after
phase switching. This means that the variable-speed operations can be performed by changing the ‘on’ operation time of each
phase through the duty control.
.
The sawtooth waveform signals are generated by the C2-R2 time constant. The voltage of this signal (Ct pin voltage) increases
from 1.3 V to 4.0 V (Vct) at each phase switching. That is, during this period, the driver becomes inactive (toff), in which
output circuit is turned off.
.
If VCC ^ 4.0 V, the driver IC remains active (ton) until the next phase switching. During this period, output circuit is turned on.
.
If the active drive time of each phase is assumed to ‘to’, the following relation can be established:
to =toff +ton
↑↑
Fixed
Rotation speed
constant
proportional constant
toff = 0.69 c C2 c R2 ........................................ 1
Constant
current
circuit
Output timing control
Unit (resistance:
Ω, capacitance: F)
Figure 1
(
): MFP14S
0.47 to 10 µ
LB1860,1860M,1861,1861M
No. 3


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