BD9P1X5EFV-C datasheet(22/60 Pages) ROHM

Nome de Peças	BD9P1X5EFV-C

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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TSZ02201-0J1J0AL01480-1-2

08.Apr.2020 Rev.002

www.rohm.com

TSZ22111

• 15 • 001

BD9P1x5EFV-C Series

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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