BD62013FS ROHM [Rohm], BD62013FS Datasheet - Page 3

• Manufacturer Part Number: BD62013FS
• Description: Three phase brushless fan motor controller
• Manufacturer: ROHM [Rohm]

 Functional descriptions
http://www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 · 15 · 001
BD62013FS
1) Commutation logic
2) Duty control
3) Carrier frequency setting
4) FG signal output
5) Direction of motor rotation setting
6) Hall signal comparator
7) Hall bias switch
When the hall cycle is about 5Hz or less (e.g. when the motor starts up), the commutation mode is 120° rectangle drive
with an upper and lower switching (no lead angle). The controller monitors the hall cycle, and switches to 150°
commutation drive when the hall cycle reaches or exceeds about 5Hz over four consecutive cycles. Refer to the timing
chart, figure 7 and 8.
The switching duty can be controlled by forcing the DC voltage to the VSP pin, from V
voltage is higher than V
lead angle). The VSP pin is pulled down internally by a 200kΩ resistor. Therefore, note the impedance when setting the
VSP voltage with the resistance voltage divider.
The carrier frequency setting can be freely adjusted by connecting an external
resistor between the RT pin and ground. The RT pin is biased to a constant
voltage, which determines the charge current to the internal capacitor. Carrier
frequencies can be set within a range from about 16kHz to 50kHz. Refer to the
formula to the right.
The direction of rotation may be switched with the CCW pin. When CCW pin is “H”
or open, the motor rotates for CCW direction. When the real direction is different
from the setting, the commutation mode is 120° rectangle drive (no lead angle). It
is recommended to pull up to VREG voltage when malfunctioning because of the
noise.
The hall comparator provides voltage hysteresis to prevent noise malfunctions. The bias current to the hall elements
should be set to the input voltage amplitude from the element, at a value higher than the minimum input voltage, V
We recommend connecting a ceramic capacitor from 100pF to 0.01µF, between the differential input pins of the hall
comparator. Note that the bias to hall elements must be set within the common mode input voltage range V
When the VSP voltage is higher than V
saving is enabled at the motor rotation stop, by using HB output for the Hall elements bias current. In addition, since the
HB output is supplied from the VREG power supply, take into consideration as load connected to the VREG pin, and be
aware of the I
The FG signal is output from the FG pin, and it is generated from the three hall signals (exclusive NOR, 12 pulses).
OMAX
HU
H
H
H
L
L
L
value.
SPTST
HV
H
H
H
L
L
L
, the controller forces PC pin voltage to the ground (Testing mode, the maximum duty and no
Table 1 120° commutation (Six-state) truth table
HW
H
H
H
L
L
L
SPHB
, the controller outputs VREG voltage to HB pin by an internal switch. A power
PWM
PWM
UH
L
L
L
L
3/20
PWM
PWM
VH
L
L
L
L
PWM
PWM
WH
L
L
L
L
--------------------
PWM
--------------------
PWM
UL
H
H
L
L
TSZ02201-0828ABB00030-1-2
F
SPMIN
--------------------
--------------------
PWM
PWM
OSC
VL
CCW
H
H
L
L
H
L
[kHz]
to V
01.JUN.2012 Rev.001
SPMAX
--------------------
PWM
--------------------
PWM
WL
=
H
H
L
L
. When the VSP
Datasheet
Datasheet
HALLCM
Direction
CCW
R
CW
T
400
.
[kΩ]
HALLMIN
.