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| NR111D Datasheet, PDF (9/14 Pages) Sanken electric – Light Load High Efficiency | |||
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Light Load High Efficiency,31V, Current Mode Step-Down 4A Switcing Regulator IC
NR111D
Oct./17/2013
Allowable package power dissipation
NOTES:
1) Glass-epoxy board mounting in a 30Ã30mm
2) copper area : 25Ã25mm
3) The power dissipation is calculated at the junction temperature 125 °C
4) Losses can be calculated by the following equation.
As the efficiency is subject to the input voltage and output current, it shall be obtained from the efficiency curve and
substituted in percent
5) Thermal design for D1 shall be made separately.
PD
ï½
VO
ï
IO
ï§ï§ï¨ï¦
100
ï¨x
ï1ï·ï·ï¸ï¶
ï
VF
ï
IO
ï§ï§ï¨ï¦1
ï
VO
VIN
ï·ï·ï¸ï¶
VO: Output voltage
VIN: Input voltage
IO: Output current
ηx: Efficiency(%)
VF: Diode forward voltage
SJPB-L4â¦0.55V(IO=3A)
Rev.1.1
SANKEN ELECTRIC CO., LTD.
9
http://www.sanken-ele.co.jp
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