Rainbow Electronics MAX1771 - Manual (Page 15)

MAX1771
12V or Adjustable, High-Efficiency,
Low I Q , Step-Up DC-DC Controller
______________________________________________________________________________________ 15
MAX1771
SHDN
R1
0.15
Ω
R7
200 Ω
REF
AGND GND
4
5
Q1
MTD6N10
6
-48V
EXT
CS
1
L1
D03340
220 µH–680µH
8
3
1
2
D1
MBRS1100T3
D2
CMPZ5240/
MMBZ5240BL
D3
CMPSH-3
C8
1
µF
+5V
300mA
7
C5
0.1 µF
C6
10 µF
100V
FB
3
V+
Q3
MMBT8599LT1
2
C7
220pF R2
47k
Ω
1%
R3
16k
Ω
1%
C4
2.2 µF
20V
R5
1k
Ω
R6
200k
Ω
R4
100k
Ω
C1
220
µF
10V
C3
0.33
µF
Q2
MMBT8099LT1
R9
5.1k Ω
C2
220
µF
10V
GND REF
MAX1771
V+
EXTL
CS
4
SHDN
0.1 µF
3.3V OR 5V
LOGIC
SUPPLY
BATTERY
INPUT
2V TO 12V
8
6, 7 5
RSENSE
0.2 Ω
1N5817
1
2
L1
22 µH
OUTPUT
ADJ = 12V TO 24V
(AS SHOWN)
N
47 µF
0.1 µF
FB 3
R3
10k Ω
10k Ω
R2
150k
Ω
MMFT3055ELT1
OFF
ON
Figure 7. -48V Input to 5V Output at 300mA, Without a Transformer
Figure 8. 2V Input to 24V Output LCD Bias