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BD63241FV Datasheet(PDF) 16 Page - Rohm

Part # BD63241FV
Description  Three-phase Full-Wave 1Hall Fan Motor Driver
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD63241FV Datasheet(HTML) 16 Page - Rohm

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Datasheet
Datasheet
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TSZ02201-0H1H0B101200-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111 • 15 • 001
BD63241FV
3.Mar.2015 Rev.001
a) Lock Protection in normal hall driving
When the Hall signal switching (detection in the falling edge) is not detected between 400msec in normal hall
driving section, it is judged that the motor is locked. In Fig. 12, the timing chart is shown.
3) UVLO(Under voltage lock out circuit)
In the operation area under the guaranteed operating power supply voltage of 16V (typ.), the transistor on the output
can be turned OFF at a power supply voltage of 3.9V (typ.). A hysteresis width of 300mV is provided and a normal
operation can be performed at 4.2V(typ.). This function is installed to prevent unpredictable operations, such as a large
amount of current passing through the output, by means of intentionally turning OFF the output during an operation at a
very low power supply voltage which may cause an abnormal function in the internal circuit.
About turning off a output voltage at UVLO, It becomes a OFF mode.
(Upper MOS FET and Under MOS FET are turned OFF.)
4) Current limit
A current passing through the motor coil can be detected on the output current detection resistance to prohibit a
current flow larger than a current limit value (motor output off).The current limit value is determined by setting of the IC
internal limit(Vcl) :150mV (typ.),and the output current detection resistance value using the following in below equation.
When no-use current limit function, RNF terminal is shorted
GND.
In Figure31, IC small signal GND line should be separated Motor large current GND line connected R1.Same as soft
start Capacitor.(Pay attention to design board(b)) item reference)
SS
Vcl
RNF
W
V
U
IC small signal
GND line
Io
Motor large current
GND line
C1
R1
Vcc
SOFT START &
CURRENT LIMIT
COMP
Icss
GND
Io[A] = Vcl[V] / R1[Ω]
= 150[mV] / 0.2[Ω]
=0.750[A]
Figure 31. small signal and large current GND line
PR[W] = Vcl[V] x Io[A]
= 150[mV] x 0.75[A]
= 0.19[W]
Connect detect current
resistance(current limit Enable)
OK
RNF
GND short setting
(current limit Disable)
OK
RNF
RNF
NG
Open setting (prohibit,motor
GND terminal)
Figure30 . Current limit function, RNF terminal setting
Ton2
(400msec)
Hall driving
(normal driving)
Output U
Output W
Output V
SOUT
(FG signal)
Motor stop
Lo output ( short brake mode)
Toff ( Lock detect off section 5sec)
Ton1 (1sec)
Hall signal
Hall detecting
re-start
Figure 29. Lock protection operation in normal hall driving
FG


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