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STK730C 데이터시트(PDF) 4 Page - Sanyo Semicon Device

부품명 STK730C
상세설명  5 V Single Output MOS Chopper Regulator
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제조업체  SANYO [Sanyo Semicon Device]
홈페이지  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK730C 데이터시트(HTML) 4 Page - Sanyo Semicon Device

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STK730C
No. 4472-4/6
Thermal Design
The power dissipating sections of a power supply block consist of the power transistor (PTR), the flywheel diode
(FWD), the choke coil, and the current detection resistor. Of these, the components that are incorporated in the hybrid IC
itself are the PTR and the FWD.
Taking PT to be the power dissipated in the PTR and PF to be the power dissipated in the FWD, the power dissipation
Pd for the whole hybrid IC and the heat sink thermal resistance
θc-a can be expressed as follows.
Pd = (PT + PF)
(W)
Tc – Ta
θc-a =
(°C/W)
Pd
Tc:
Substrate temperature (105°C, maximum)
Ta:
IC ambient temperature
The junction temperature, Tj, of each element can be expressed as follows.
Tj = PD
× θj-c + Tc
(°C)
PD:
Power loss for each element (PT, PF)
θj-c: The junction/case thermal resistance of each element
Thermal design consists of deriving the heat sink thermal resistance
θc-a that satisfies the two thermal conditions, i.e.,
the maximum IC substrate temperature Tc max (105°C) and the maximum junction temperature Tj max for each
semiconductor device, and then implementing that thermal resistance. Since thermal dissipation is greatly influenced by
the ambient temperature, the structure of the equipment itself, and other factors, ample margins must be included in the
thermal design to take them into account.
The figure below left shows the relationship between area and thermal resistance when an aluminum plate is used in the
thermal design. The radiation characteristics of an aluminum plate can be improved by painting the surface black. This
can reduce the thermal resistance by 20% for a given surface area.
IC power dissipation
Output current, IO – A
IC power dissipation
Output current, IO – A
θc-a – S
Heat sink area, S – cm2
IC power dissipation
Output current, IO – A


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