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BD9778HFP Datenblatt(PDF) 13 Page - Rohm

Teilenummer BD9778HFP
Bauteilbeschribung  Flexible Step-down Switching Regulators with Built-in Power MOSFET
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD9778HFP Datenblatt(HTML) 13 Page - Rohm

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Technical Note
<Procedure>
1. Check to ensure output causes no oscillation at the maximum
load in closed loop.
Isolate (1) and (2) and insert Vm (with amplitude of
approximately 100 mVpp).
Measure (probe) the oscillation of
(1) to that of (2).
2.
3.
Heat loss
Furthermore, the phase margin can also be measured with the
load responsiveness.
Measure variations in the output voltage when instantaneously
changing the load from no load to the maximum load.
Even though ringing phenomenon is caused, due to low phase margin,
no ringing takes place. Phase margin is provided. However,
no specific phase margin can be probed.
To measure the open loop of DC/DC converter, use the gain phase analyzer or FRA to measure the frequency
characteristics.
rA
<Reference> Measurement of open loop of DC/DC converter
The heat loss W of the IC can be obtained by the formula shown below:
W=Ron X Io2 X
+ VIN X ICC + Tr X VIN X Io X f
Ron: ON resistance of IC (refer to pages 4 and 5.) Io: Load current Vo: Output voltage
VIN: Input voltage Icc: Circuit current (Refer to pages 2 and 3)
Tr: Switching rise/fall time (Approximately 40 nsec)
f : Oscillation frequency
Vo
VIN
1Ron X Io2
22 X
=Tr X VIN X Io X f
X Tr X
X VIN X Io
2
1
T
1
1
Tr
VIN
GND
SW
waveform
T =
f
1
2
VO
Vm
+
RL
~
DC/DC converter
controller
Load
Output voltage
Maximum load
t
Adequate phase margin
Inadequate phase margin
0
ºC
ºC
2010.02 -
Rev. B
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
BD9778F, BD9778HFP, BD9001F, BD9781HFP


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