STK740-420 SANYO [Sanyo Semicon Device], STK740-420 Datasheet - Page 4

• Manufacturer Part Number: STK740-420
• Description: 3.3V/5A Single Output Separate Excitation Chopper Regulator
• Manufacturer: SANYO [Sanyo Semicon Device]

Test Circuit
Overvoltage Protection Circuit
In a constant-voltage power supply circuit output voltage may generally exceed the stipulated rating (equivalent to input
voltage) when the circuit is broken down or the IC and the printed circuit board is wrongly soldered. Therefore overvoltage
protection circuit is recommended to use to minimize the damages caused by the overvoltage.
DC
INPUT
GND
C1
C2
L1
FB
DC
INPUT
GND
C1
: 220 F/10V (OS capacitor)
: 2200 F/6.3V
: 30 H
: Ferrite-bead core
12
FUSE
SCR
11
Sample the overvoltage protection circuit
10
9
FB
8
STK740-441
CR
7
Regulator
6
5
4
L1
3
2
1
C2
OUTPUT
GND
OUTPUT
(3.3V)
GND
ON/OFF
Vo adjust
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