Rainbow Electronics MAX1847 User Manual
Page 17
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
______________________________________________________________________________________
17
COMP
C
COMP
R
COMP
R
FREQ
GND
FREQ
VL
V
IN
V
OUT
C
OUT
C
IN
1
9
8
7
5
4
2
3
P
L1
R
CS
C
FB
D1
10
22k
0.47
µF
0.1
µF
6
EXT
PGND
REF
IN
CS
FB
MAX1846
R2
R1
APPLICATION B
ONLY
NOTE: APPLICATIONS A & B USE POS CAPACITORS. APPLICATIONS C & D USE ALUMINUM ELECTROLYTIC CAPACITORS.
Figure 2. MAX1846 Main Application Circuit
CIRCUIT ID
A
B
C
D
Input (V)
12
3 to 5.5
12
12
Output (V)
-5
-12
-48
-72
Output (A)
2
0.4
0.1
0.1
C
COMP
(µF)
0.047
0.22
0.068
0.1
C
IN
(µF)
3 x 10
3 x 22
10
10
C
OUT
(µF)
2 x 100
2 x 47
47
33
C
FB
(pF)
390
1200
1800
1800
R1 (k
Ω) (1%)
40.2
95.3
383
576
R2 (k
Ω) (1%)
10
10
10
10
R
COMP
(k
Ω)
8.2
10
150
1800
R
CS
(
Ω)
0.02
0.02
0.05
0.05
R
FREQ
(k
Ω)
150
150
150
150
D1
CMSH5-40
CMSH5-40
CMR1U-02
CMR1U-02
L1 (µH)
10
10
47
82
P1
FDS6685
FDS6375
IRFR5410
IRFR5410
Table 1. Component List for Main Application Circuits