STK795 Sanyo, STK795 Datasheet

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STK795

Manufacturer Part Number
STK795
Description
Chopper Type Voltage Regulator
Manufacturer
Sanyo
Datasheet
1.STK795.pdf (5 pages)

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www.DataSheet4U.com
Features
• Self-oscillation type chopper regulator power IC using
• The STK795, being a 5V chopper IC, is more advanta-
• Functional trimming is used to set 5V output with high
• Cutoff function to cut off output voltage by external sig-
• Contains a transistor for overcurrent protector (foldback
Specifications
Maximum Ratings at Ta = 25˚C
Operating Characteristics at Ta = 25˚C, See specified Test Circuit.
Ordering number:ENN1709C
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Sanyo’s original IMST (Insulated Metal Substrate Tech-
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geous in the following points as compared with series
regulator (dropper type) ICs.
accuracy.
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characteristic) and possibel to set the protection level ex-
ternally.
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1. Possible to provide a 5V output power supply circuit
2. Since the input voltage range is wide, no more than
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with high efficiency.
one rectifying/smoothing circuit is required to pro-
vide a multi-output power supply circuit which also
delivers 12V or 24V output.
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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.
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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.
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Package Dimensions
unit:mm
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STK795 Summary of contents

Page 1

... Features • Self-oscillation type chopper regulator power IC using Sanyo’s original IMST (Insulated Metal Substrate Tech- nology) substrate. • The STK795, being a 5V chopper IC, is more advanta- www.DataSheet4U.com 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 ...

Page 2

... Note) · Schottky barrier diode SB40-05. · Beads core · C3 are used to reduce switching spike noise. · TR1 is used to provide overcurrent protection protection is required, remove TR1. · A current of 0.5A min. must flow in the load. STK795 No.1709–2/5 ...

Page 3

... STK795 No.1709–3/5 ...

Page 4

... 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 : j-c=6.2 C/W Therefore calculated using 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. STK795 2 . (55 55 2t) Tj=Pd j-c+Tc. ...

Page 5

... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of October, 1999. Specifications and information herein are subject to change without notice. STK795 PS No.1709–5/5 ...

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