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BD63731EFV Datasheet(PDF) 10 Page - Rohm

No. de pieza BD63731EFV
Descripción Electrónicos  36 V High-performance, High-reliability Withstand Voltage Stepping Motor Driver
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BD63731EFV Datasheet(HTML) 10 Page - Rohm

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BD63731EFV
TSZ02201-0P1P0C702140-1-2
© 2019 ROHM Co., Ltd. All rights reserved.
21.Jun.2019 Rev.001
www.rohm.com
TSZ22111
• 15 • 001
PWM Constant Current Control
1
Current control operation
When the output transistor is turned on, the output current increases. The output current is converted to voltage due to
the connected external resistance to the RNFX
(Note 1) pin. When the voltage on the RNF
X pin reaches the voltage value
set by the VREF input voltage, the current limit comparator operates and enters current decay mode. Output turns on
again after changing this pin to the high voltage from the low voltage. The process repeats itself with chopping period
(tCHOP).
(Note 1) x=1 or 2
2
Noise-masking function
In order to avoid misdetection of current detection comparator due to RNF spike noise that may occur when the output
turns ON, the IC has the minimum ON time tONMIN (Blank time). The current detection is invalid from the output
transistor turned on to tONMIN. This allows for constant-current drive without the need for an external filter.
3
CR Timer
The external capacitor and resistor connected to the CR pin is repeatedly charged and discharged between the VCRH
and VCRL levels. The CR pin voltage decides in IC and it is VCRL=0.4 V, VCRH=1.0 V respectively. The output of the
current detection comparator is masked while charging from VCRL to VCRH. As mentioned above, this period defines the
minimum ON-time. The CR pin begins discharging once the voltage reaches VCRH. When the output current reaches
the current limit during this period, then the IC enters decay mode. The CR continues to discharge during this period
until it reaches VCRL, at which point the IC output is switched back ON. The current output and the CR pin begin
charging simultaneously. The CR charge time (tONMIN) and discharge time (tDISCHARGE) are set by external components,
according to the following formulas. The total of tONMIN and tDISCHARGE yield the chopping period, tCHOP.
������������������������ ≒ ���� ×
��������
����+����
× �������� (
������������−0.4
������������−1.0
)
[s]
Where:
tONMIN
:
is the minimum ON-time.
C
:
is the capacitance of the CR Pin.
R
:
is the resistance of the CR Pin.
R’
:
is the CR Pin internal impedance 5 k
Ω(Typ)
VCR
:
is the CR Pin voltage.
������������ = ���� ×
����
����+����
[V]
Where:
V
:
is the internal regulator voltage 5 V(Typ).
���������������������������������������� ≒ ���� × ���� × �������� (
1+����
0.4
)
[s]
Where:
tDISCHARGE
:
is the CR discharge time.
α
:
Refer to the right graph.
�������������������� = ������������������������ + ����������������������������������������
[s]
Where:
tCHOP
:
is the chopping period.
Figure 1. CR Coefficient for calculation of
discharge time
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0
500
1000
1500
2000
C[pF]


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