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BD9P105MUF-CE2 Folha de dados(PDF) 19 Page - Rohm

Nome de Peças. BD9P105MUF-CE2
descrição  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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Fbricantes  ROHM [Rohm]
Página de início  http://www.rohm.com
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BD9P105MUF-CE2 Folha de dados(HTML) 19 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
2. Light Load Mode control and Forced PWM Mode control - continued
If the output load decreases below 200 mA (Typ) (OCP_SEL = H), the output voltage rises and power state is changed
to SLEEP state when the output voltage exceeds to VFB2 (101.3 % of its setting voltage VFB1). During SLEEP state,
switching operation is stopped and the circuit current is reduced by stopping the circuit operation except for the monitor
circuit of output voltage monitor. Then, the switching operation restarts when the output voltage decreases less than
VFB3 (101.0 % of its setting voltage VFB1) by the load current.
If the light load mode operation is not required, the IC operates in forced PWM mode by applying high voltage or an
external clock to the MODE pin. In forced PWM mode, the IC operates with fixed frequency regardless of the output load
and the ripple voltage of output can be reduced. Also, during soft start time, the IC operates in forced PWM mode
regardless of the condition of the MODE pin. After detecting RESET high, the IC operates according to the MODE pin
condition.
If OCP_SEL set low level, then the threshold current of switched between PWM mode and LLM is changed to 100 mA
(Typ).
In addition, good EMI performance in AM band may not be provided by a load condition in LLM. To avoid this, use
Forced PWM mode.
VEN
VOUT
IL
IOUT
VFB2 = VFB1 × 101.3 % (Typ)
VFB3 = VFB1 × 101.0 % (Typ)
200 mA
200 mA
VRESET
VFB1
Figure 31. Timing Chart in Light Load Mode (OCP_SEL = H)
VEN
VOUT
IL
IOUT
VFB2 = VFB1 × 101.3 % (Typ)
VFB3 = VFB1 × 101.0 % (Typ)
200 mA
200 mA
VRESET
VFB1
Figure 32. Timing Chart in Light Load Mode after Detecting RESET High (OCP_SEL = H)


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