AIC1628
APPLICATION EXAMPLES (CONTINUED)
ꢀ
Efficiency vs Load Current
1N5819
L1
85
80
75
70
65
60
R4
VOUT
-48V to +5V
220µH
Sumida CDR105
D1
100K
+5V
R5
+
100mA
Q1
72K
2N2907
0.1µF
+
C5
+
C6
1µF
C1
C3
VIN
CL
1N3906
Q2
VREF
SHDN
DHI
2SK940
20K
12V
DLOW
GND
0.047µF
FB
R3
20K
C4
VIN
-48V
AIC1628
0
50
100
150
Load Current (mA)
Fig. 4 Telecom +5V supply
VIN
Efficiency vs Load Current
1N5819
D3
+
+5V
95
D2
C4
C1
100µF
47µF
90
85
+
C5
+
1µF
VIN
CL
2SK1463
Q1
VREF
SHDN
DHI
33µH
DLOW
GND
VOUT
80
75
*L1
D1
1N5820
FB
C2
+
+3.3V
2A
C3
330µF
AIC1628
R1
34K
R2
100
1000
10
20K
*MPP Core
Load Current (mA)
Fig. 5 5V to 3.3V step-down converter
6
AIC [ ANALOG INTERGRATIONS CORPORATION ]
