Application example – FUJITSU MB39A104 User Manual
Page 22
MB39A104
22
■ APPLICATION EXAMPLE
A
B
B
A
R10
R11
C12
1000 pF
C14
1000 pF
C21
1000 pF
R15
R16
R13
R8
VIN
(7
V to 19
V)
C1 100 pF
R5
Q2
L2
V
O
2
(3.3 V)
D2
R4
Q1
L1
V
O
1
(5.0 V)
D1
+
+
+
+
+
+
+ +
+
+
+ +
+ +
+
+
10
VREF
VREF
11
9
6
15
14
16
19
8
CS1
FB1
DTC1
CS2
FB2
DTC2
CSCP
12
13
18
17
RT
C
T
GND
VREF
24
7
23
2
20
21
22
5
4
3
1
CTL
VCC
GNDO
VH
ILIM2
VS2
OUT2
ILIM1
VS1
OUT1
VCCO
1.24 V
1.24 V
3.1 V
SCP Comp
.
SCP Logic
UVLO
OSC
VREF
Bias
V
oltage
Current
Protection
Logic
Current
Protection
Logic
I
O
=
200 mA
at VCCO
=
12
V
I
O
=
200 mA
at VCCO
=
12
V
VR1
VH
1.24 V
2.5 V
1.5 V
5.0 V
bias
Po
w
e
r
ON/OFF
CTL
P-ch
Dr
iv
e2
P-ch
Dr
iv
e1
PWM Comp
.1
PWM Comp
.2
Error
Amp2
Error
Amp1
CH1
CH2
Step- do
wn
Step- do
wn
L pr
ior
ity
L pr
ior
ity
L pr
ior
ity
L pr
ior
ity
H pr
ior
ity
accur
acy
± 1%
H:
UVLO release
H:
at OCP
H:
at SCP
Error Amp Ref
erence
Error Amp P
o
w
er Supply
CH1 ON/OFF signal
(Hiz :
ON, L :
OFF)
CH2 ON/OFF signal
(Hiz :
ON, L :
OFF)
H : ON (Po
w
e
r ON)
L
: O
FF (
S
ta
nd
by
mod
e
)
V
TH
=
1.
4 V