Technical Note
6/18
www.rohm.com
2009.08 - Rev.A
?2009 ROHM Co., Ltd. All rights reserved.
BD9153MUV
?SPAN class="pst BD9153MUV-E2_2471427_7">Information on advantages
Advantage 1
Offers fast transient response with current mode control system.
Fig.26
Advantage 2
Offers high efficiency for all load range.
鸉or lighter load:
Utilizes the current mode control mode called SLLM for lighter load, which reduces various dissipation such as switching
dissipation (P
SW
), gate charge/discharge dissipation, ESR dissipation of output capacitor (P
ESR
) and on-resistance
dissipation (P
RON
) that may otherwise cause degradation in efficiency for lighter load.
Achieves efficiency improvement for lighter load.
鸉or heavier load:
Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs incorporated as power transistor.
ON resistance of Highside MOS FET : 170m&(Typ.)
ON resistance of Lowside MOS FET : 130m&(Typ.)
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
Fig.27 Efficiency
BD9153MUV
(Load response IO=0.5A?.5A / usec)
BD9153MUV
(Load response IO=1.5A?.5A / usec)
0.001 0.01 0.1
1
0
50
100
`
a
PWM
SLLM
`inprovement by SLLM system
aimprovement by synchronous rectifier
Output current Io[A]
Io1
VOUT1
Io1
VOUT1
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