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BD9P105MUF-CE2 Folha de dados(PDF) 22 Page - Rohm

Nome de Peças BD9P105MUF-CE2
Descrição Electrónicos  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
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BD9P105MUF-CE2 Folha de dados(HTML) 22 Page - Rohm

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© 2019 ROHM Co., Ltd. All rights reserved.
28.Apr.2020 Rev.001
www.rohm.com
TSZ22111 • 15 • 001
BD9P1x5MUF-C Series
TSZ02201-0J1J0AL01500-1-2
Function Explanation - continued
6.
Frequency Division Function
This device drives the High Side FET with a bootstrap and requires the ON time of the Low Side FET to charge the BST
pin. Therefore, the minimum OFF time of the SW pin is specified, and the output voltage is limited by the minimum OFF
time under the condition in which the voltage between input and output are close. To prevent this situation, OFF pulses
are skipped when the voltage between input and output are small to keep the High Side FET turned on and increase the
ON duty of the SW pin. The OFF pulse skip is done for 7 consecutive switching cycles in maximum (The switching
frequency becomes a one eighth of nominal frequency). In this case, the output voltage can be calculated with the
following equation.
���������������� = ���������������������������� × (������������ − ���������������� × ����������������) − ������������ × ����������������
= (1 − ���������������������������� ×
������������
8
) × (������������ − ���������������� × ����������������) − ������������ × ���������������� [V]
Where:
����������������������������
is the SW pin Maximum ON Duty Cycle [%]
������������
is the Input Voltage [V]
����������������
is the High Side FET ON Resistance [Ω]
(Refer to page 11)
����������������
is the Output Current [A]
������������
is the DCR of Inductor [Ω]
����������������������������
is the SW pin Minimum OFF Time [s]
(Refer to page 10)
������������
is the Switching Frequency [Hz]
(Refer to page 11)
VOUT
VIN
VSW
Figure 36. Frequency Division Function


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