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BD9P1X5EFV-C 데이터시트(PDF) 19 Page - Rohm |
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BD9P1X5EFV-C 데이터시트(HTML) 19 Page - Rohm |
19 / 60 page 19/57 TSZ02201-0J1J0AL01480-1-2 © 2019 ROHM Co., Ltd. All rights reserved. 08.Apr.2020 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5EFV-C Series 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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