AA18380
Agamem Microelectronics Inc.
PRELIMINARY
Switching Regulator Controller
■TYPICAL APPLICATION EXAMPLE
Boost Type - Step Up
L1
22uH
IN-
SCP
FB
1
2
3
4
8
7
6
5
Vout
(5V)
1N5821
D1
OSC
GND
OUT
Vcc
18KΩ
2KΩ
R1
C3
33uF
C6
10uF
Vin
(3V)
BR/CTL
Q1
FZT489
C1
0.1uF
R6
C4
0.1uF
390Ω
R2
C5
270pF
R5
3KΩ
Q2
2N7002
Vout = 0.5 X (1 + R1/R2)
Buck Type - Step Down
2SA1585S
22uH
470Ω
2N3904
R1
9KΩ
IN-
FB
1
2
3
4
8
7
6
5
68pF
33uF
20KΩ
OSC
GND
2KΩ
SCP
Vcc
47uF
FR154
BR/CTL
0.1uF
OUT
R2
104pF
Vin
(12V)
1KΩ
2N3904
0.1uF
270pF
4.7KΩ
3KΩ
1.bootstrap, single end push pull style.
2.Vout = 0.5 X (1 + R1/R2)
3.For example, R1=5.6KΩ, R2=1KΩ, Vout=3.3V
11
©Copyright Agamem Microelectronics Inc.
www.agamem.com.tw
2007/1/15
AGAMEM [ AGAMEM MICROELECTRONIC INC. ]
