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BD63731EFV Datasheet(Fiches technique) 20 Page - Rohm

Numéro de pièce BD63731EFV
Description  36 V High-performance, High-reliability Withstand Voltage Stepping Motor Driver
Télécharger  31 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BD63731EFV Datasheet(HTML) 20 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
Power Dissipation
In consideration of the IC’s power consumption (W), thermal resistance (°C/W), and ambient temperature (Ta), confirm that the
IC’s chip temperature Tj is not over 150 °C. When Tj=150 °C is exceeded, the functions as a semiconductor do not operate and
problems such as parasitism and leaks occur. Constant use under these circumstances leads to deterioration and eventually
destruction of the IC. Tjmax=150 °C must be strictly obeyed under all circumstances.
1
Thermal Calculation
The IC
’s consumed power can be estimated roughly with the power supply voltage (VCC), circuit current (ICC), output
ON resistance (RONH, RONL) and motor output current value (IOUT).
The calculation method during FULL STEP drive, SLOW DECAY mode is shown here:
���������������� = ������������ × ������������
[W]
Where:
WVCC
:
is the consumed power of the VCC.
VCC
:
is the power supply voltage.
ICC
:
is the circuit current.
�������������������� = ������������ + ������������������������ [W]
������������ = (���������������� + ����������������) × ����������������2 × 2 × ��������_���������������� [W]
������������������������ = (2 × ����������������) × ����������������2 × 2 × (1 − ��������_����������������) [W]
Where:
WDMOS
:
is the consumed power of the output DMOS.
WON
:
is the consumed power during output ON.
WDECAY
:
is the consumed power during current decay.
RONH
:
is the upper P-channel DMOS ON-resistance.
RONL
:
is the lower N-channel DMOS ON-resistance.
IOUT
:
is the motor output current value.
on_duty
:
PWM on duty
= ������������ ����
����������������
tON varies depending on the L and R values of the motor coil and the current set value. Confirm by actual
measurement, or make an approximate calculation.
tCHOP is the chopping period, which depends on the CR pin. Refer to P.10 for details.
IC number
Upper Pch DMOS ON Resistance
RONH[Ω] (Typ)
Lower Nch DMOS ON Resistance
RONL[Ω] (Typ)
BD63731EFV
0.18
0.10
����_�������������������� = ���������������� + �������������������� [W]
�������� = �������� + ������������ × ����_�������������������� [°C]
Where:
W_total
:
is the consumed total power of IC.
Tj
:
is the junction temperature.
Ta
:
is the ambient temperature.
θja
:
is the thermal resistance value.
However, the thermal resistance value
θja [°C/W] differs greatly depending on circuit board conditions. The calculated
values above are only theoretical. For actual thermal design, perform sufficient thermal evaluation for the application
board used, and create the thermal design with enough margin not to exceed Tjmax=150 °C. Although unnecessary
with normal use, if the IC is used under especially strict heat conditions, consider externally attaching a Schottky diode
between the motor output pin and GND to abate heat from the IC.


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