STK730C Sanyo Semiconductor Corporation, STK730C Datasheet - Page 5

• Manufacturer Part Number: STK730C
• Description: 5V Signal Output MOS Chopper Regulator
• Manufacturer: Sanyo Semiconductor Corporation

STK730C
Notes on PC Board Production
• Capacitor C1 should be placed as close as possible to the pin 10 input in the layout. (This is to prevent voltage drops in
• Capacitor C2 should be placed as close as possible to the load in the layout. (This is to compensate for voltage drops
• Pins 2 and 5 are voltage sensing lines, and should be connected close to the load, i.e., close to C2. (This is to
• Pins 3 and 4 should be directly connected to the two terminals of the current detection resistor Rs1. (This is to prevent
• Pin 6 should be connected to the capacitor C1 ground using a thick, short line to reduce the related loop area. (This is
• Power lines, i.e., lines that carry current, should be made as wide as possible in the pattern.
• When a ripple suppression LC filter is added, connect it at the location indicated by dotted lines in the figure. The
• The NC pins (pins 7 and 9) should not be connected to any other lines, even on the PC board.
Two Output Power Supply Structural Example (connecting to an STK733)
Note: It is possible for STK730 input ripple currents to cause L1 to vibrate audibly and adversely influence the 24 V system. If such problems occur, an
PTR (FET)
FWD (SBD)
the input lines and pattern. Also, a separate smoothing capacitor is required if the input is a direct current input using
rectified and smoothed AC.)
due to load fluctuations.)
compensate for voltage drops in the pattern.)
detection based on pattern resistances.)
to reduce switching spikes.)
sensing line from pin 2 should be connected to the same position (the C2 location) as it is when no filter is used.
inductor can be inserted at the point marked with dotted lines in the figure to form an LC filter.
j-c, Tj max
3.5°C/W
7.2°C/W
j-c
Tj max
150°C
125°C
STK730C
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