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STK795 데이터시트 PDF




Sanyo에서 제조한 전자 부품 STK795은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 STK795 기능
기능 Chopper Type Voltage Regulator
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STK795 데이터시트, 핀배열, 회로
Ordering number:ENN1709C
Thick Film Hybrid IC
STK795
Chopper Type Voltage Regulator
Features
• Self-oscillation type chopper regulator power IC using
Sanyo’s original IMST (Insulated Metal Substrate Tech-
nology) substrate.
www.DataSheet4UT.hceomSTK795, being a 5V chopper IC, is more advanta-
geous in the following points as compared with series
regulator (dropper type) ICs.
1. Possible to provide a 5V output power supply circuit
with high efficiency.
2. Since the input voltage range is wide, no more than
one rectifying/smoothing circuit is required to pro-
vide a multi-output power supply circuit which also
delivers 12V or 24V output.
• Functional trimming is used to set 5V output with high
accuracy.
• Cutoff function to cut off output voltage by external sig-
nal.
• Contains a transistor for overcurrent protector (foldback
characteristic) and possibel to set the protection level ex-
ternally.
Package Dimensions
unit:mm
4063A
[STK795]
53.0
1 16
2.54
15×2.54=38.1
0.5
9.0
0.4
2.9
SANYO : SIP16
Specifications
Maximum Ratings at Ta = 25˚C
Parameter
Maximum DC Input Voltage
Maximum Output Current
Operating Substrate Temperature
Junction Temperature
Storage temperature
Symbol
Vin(DC) max
IO max
Tc
Tj
Tstg
Conditions
Operating Characteristics at Ta = 25˚C, See specified Test Circuit.
Parameter
Output Voltage
Line Regulation
Load Regulation
Efficiency
Frequency
Temperature Coefficient
Symbol
Conditions
VO VIN=12V, IO=1.5A
VIN=10 to 15V, IO=1.5A
VIN=12V, IO=0.5 to 3A
VIN=12V, IO=1.5A
f VIN=12V, IO=1.5A
VIN=12V, IO=1.5A
Ratings
40
3
105
150
–30 to +105
Unit
V
A
˚C
˚C
˚C
Ratings
min typ
4.9 5.0
70
30
72
35
1
Unit
max
5.1 V
100 mV
60 mV
%
kHz
mV/˚C
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O2099TH (KT)/21094YK/O199TA/5236KI, TS No.1709–1/5




STK795 pdf, 반도체, 판매, 대치품
STK795
Thermal Design
The total internal power dissipation in the IC is related to the output current as shown below. Assuming Vin(DC)=12V,
output current=3A, the total internal power dissipation is 2.7W.
www.DataSheet4U.com
Assuming that the IC case temperature (Al plate) is 85°C (Tc max=105°C) and the temperature inside equipment is 60°C
max., the thermal resistance required of the heat sink is as shown below.
θc-a=
85°C–60°C
2.7W
=9.3°C/W
For 2mm thick Al plate (black coated), the area is 30cm2. (55×55×2t)
Junction temperature Tj of the power transistor which forms a main heat source is calculated as follows :
The thermal resistance of the power transistor is : θj-c=6.2°C/W
Therefore, Tj is calculated using Tj=Pd×θj-c+Tc.
Tj=2.7W×6.2°C/W+85°C=101.7°C
Since the actual thermal resistance of the heat sink greatly depends on various conditions such as the layout of equip-
ment or ventilation, allow an ample margin in thermal design.
No.1709–4/5

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