BU6909AGFT Datasheet, PDF (2/21 Pages) Rohm – Built in HALL element

BU6909AGFT
Datasheet
Block Diagram
This is an open drain output.
Connect a pull-up resistor.
Page 15.
FG
1
GND
2
OUT1
3
HALL ELEMENT
OFFSET
CANCEL
OSCILLATOR
CIRCUIT
UVLO
TSD
CONTROL
LOGIC
A/D
CONVERSION
PRE
DRIVER
H-BRIDGE
LOCK
PROTECTION
PWM DUTY
SIGNAL OUT
VCC
6
Consider protection against
voltage rise due to reverse
connection of power supply and
back electromotive force.
Page 14.
PWM
5
OUT2
Enables speed control by
applying external PWM signal.
Maximum input frequency is
50KHz.
Page 10.
4
M
Conventional FAN motor driver IC with HALL element requires
adjustment of HALL bias resistor due to several factors that
affect the HALL Amplitude. This IC automatically adjusts HALL
amplitude through the use of a built in HALL element and unique
AGC function.
Page 8.
TSD : Thermal shut down(h^He^ea^at^tr^pe^rje^oc^teti^co^tn^iocⁿircu^iri^ct)^uit)
UVLO :Under voltage lock outputs (low voltage protection circuit)
Figure 1. Block diagram and Application circuit
Pin Description
Pin No.
1
2
3
4
5
6
Pin Name
FG
GND
OUT1
OUT2
PWM
VCC
Function
FG signal output
GND
Motor output 1
Motor output 2
PWM signal input
Power supply
I/O truth table
・Supply magnetic direction (positive)
S
Marking
N
・Output operation
VOUT1
VOUT2
B_HYS
B_HYS
BREV
BFWD
Magnetic flux density:B
Figure 2. Output operation
BREV
BFWD
Magnetic flux density:B
Supply magnetic
direction
PWM*
OUT1
OUT2
S
H(OPEN)
H
L
N
H(OPEN)
L
H
S
L
L
L
N
L
L
L
*When PWM terminal is L, IC state changes to stand-by mode. FG terminal is always H in stand-by mode
FG
L (Output Tr：ON)
H (Output Tr：OFF)
H (Output Tr：OFF)
H (Output Tr：OFF)
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TSZ02201-0H1H0B101190-1-2
28.Oct.2014 Rev.002