
MC34844A
TYPICAL APPLICATIONS
LED MATRIX (40S8P)
150UH
1
PDS3200
VOUT = 120V
VIN = 60V to 72V
7447709151
2
3
47uF
100V
+
0
10uF
100V
47V
3SMBJ5941B-TP
VDC2
10
0.1UF
FDS2572
10uF
250V
+
10uF
250V
+
10uF
250V
+
1uF
250V
2.2uF
0
10.0K
EN_DLY
2.2uF
2.2uF
VOUT
270K
OVP = 125V
1.0k
2.2uF
100pF
0
0
PWM = 200Hz (5V)
6.8K
0.1UF
100V
3.3nF
27K
4.64K
0
200k
0 EN_DLY
0
VDC1
1
28
31
23
29
22
24
7
25
27
26
6
30
19
0
VIN
VDC1
VDC2
VDC3
COMP
SLOPE
CK
EN
PWM
SCK
SDA
A0/SEN
M/~S
ISET
SWA
SWB
VOUT
PGNDA
PGNDB
FAIL
I0
I1
I2
I3
I4
I5
I6
I7
I8
I9
4
3
32
5
2
18
8
9
10
11
12
13
14
15
16
17
82V
MMSZ5268BT1G
0
18K
0
ISET =
60mA
VDC1
20
21
PIN
NIN
GND
33
MC34844A
0
220pF
220pF
220pF
220pF
220pF
220pF
220pF
220pF
0
Figure 31. HIGH VOUT application (Manual Mode)
Conditions: V IN = 60 to 72V, V OUT = 120 V, Load = 40S8P, I LED = 60 mA, OVP = 125 V, f SW = 300 kHz
34844A
Analog Integrated Circuit Device Data
Freescale Semiconductor
54