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34844 Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc

Part # 34844
Description  10 Channel LED Backlight Driver with Integrated Power Supply
PDF  37 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34844 Datasheet(HTML) 24 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
24
Freescale Semiconductor
34844
TYPICAL APPLICATIONS
LOGIC COMMANDS AND REGISTERS
TYPICAL APPLICATIONS
Figure 7. Manual Mode (Single Wire Control)
Conditions: VIN = 24 V, VOUT = 47 V, Load = 16S10P, ILED = 60 mA, OVP = 53V, fSW = 300 kHz
Figure 8. Manual Mode (Two Wire Control)
Conditions: VIN = 24 V, VOUT = 47 V, Load = 16S10P, ILED = 60 mA, OVP = 53V, fSW = 300 kHz
VIN = 24V
0
0
0
VOUT
0
0
0
0
VDC1
VDC1
VCC
0
VOUT
Master CK
LED MATRIX (16S10P)
MANUAL MODE (Single Wire Control)
Output
OVP = 55V
5.6K
5.6K
+
47uF
+
47uF
2.2uF
2.2uF
3.3K
3.3K
20K
20K
309K
309K
5.1K
5.1K
+
13.8uF
+
13.8uF
150K
150K
1.8nF
1.8nF
U1
34844
U1
34844
VIN
1
VDC1
28
COMP
29
EN
7
CK
24
M/~S
30
PWM
25
SCK
27
SDA
26
A0/SEN
6
ISET
19
PIN
20
NIN
21
SWA
4
SWB
3
VOUT 32
PGNDA 5
PGNDB 2
VDC2
31
FAIL 18
I0 8
I1 9
I2 10
I3 11
I4 12
I5 13
I6 14
I7 15
I8 16
I9 17
VDC3
23
SLOPE
22
GND 33
56pF
56pF
CLK
CLK
D1
D1
2
1
2.2uF
2.2uF
22uH
22uH
1
2
2.2uF
2.2uF
1.0K
VIN = 24V
0
0
0
0
VCC
VOUT
VOUT
0
VDC1
VDC1
0
0
0
Master CK Output
LED MATRIX (16S10P)
OVP = 55V
MANUAL MODE (Two Wire Control)
Unit
Control
EN
PWM
2.2uF
2.2uF
D5
D5
2
1
22uH
22uH
1
2
1.8nF
1.8nF
2.2uF
2.2uF
3.3K
3.3K
150K
150K
+
13.8uF
+
13.8uF
U2
34844
U2
34844
VIN
1
VDC1
28
COMP
29
EN
7
CK
24
M/~S
30
PWM
25
SCK
27
SDA
26
A0/SEN
6
ISET
19
PIN
20
NIN
21
SWA
4
SWB
3
VOUT
32
PGNDA 5
PGNDB 2
VDC2
31
FAIL 18
I0 8
I1 9
I2 10
I3 11
I4 12
I5 13
I6 14
I7 15
I8 16
I9 17
VDC3
23
SLOPE
22
GND 33
2.2uF
2.2uF
20K
20K
5.1K
5.1K
5.6K
5.6K
56pF
56pF
+
47uF
+
47uF
309K
309K
1.0K



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