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34845B Datasheet(PDF) 14 Page - Freescale Semiconductor, Inc

Part # 34845B
Description  Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply
PDF  21 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34845B Datasheet(HTML) 14 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
14
Freescale Semiconductor
34845
TYPICAL APPLICATIONS
INTRODUCTION
TYPICAL APPLICATIONS
Figure 10. Typical Application Circuit for Single Wire Control, fS = 600 KHz
(VIN = 9.0 V, ILED/channel = 20 mA/channel, 12 LEDs/channel, OVP = 45 V, VPWM = 3.3 V)
Figure 11. Typical Application Circuit for Single Wire Control, fS = 1.2 MHz
(VIN = 9.0 V, ILED = 20 mA/channel, 12 LEDs/channel, OVP = 45 V, VPWM = 3.3 V)
MC34845
CH5
CH1
CH2
CH3
10 uH
CH4
20
23
18
11
10
9
8
7
3
4
60 V, 1A
LED
LEG 2
VIN
LED
LEG 1
CH6
12
LED
LEG 3
SWA
SWB
LED
LEG 4
LED
LEG 5
LED
LEG 6
2.2 uF
OVP
14
FAIL
22
1
VIN
2.2uF
10 V
VD C1
2. 2uF
10 V
VD C2
EN
6
24
VOU T
PGN D
2
5
PGN D
WAKE
EP
10uf
25V
15
7.6 5 KO
0.1 %
21
13
GND
GND
PWM
16
5.6 M O
1 MO
2.2uF
100 pF
100pF
100 pF
100 pF
100 pF
100p F
Cap s should be l ocated
as c lose as poss ible to
the MC 34845 de vice
0. 1uf
56 pF
COM P
17
2.2nF
10 kO
22 kO
Cont rol
Un it
k
Ω
k
Ω
k
Ω
k
Ω
k
Ω
MC34845A
CH5
CH1
CH2
CH3
4.7uH
CH4
20
23
18
11
10
9
8
7
3
4
60 V, 1A
LED
LEG 2
VIN
LED
LEG 1
CH6
12
LED
LEG 3
SWA
SWB
LED
LEG 4
LED
LEG 5
LED
LEG 6
2.2 uF
OVP
14
FAIL
22
1
VIN
2.2uF
10 V
VD C1
2. 2uF
10 V
VD C2
EN
6
24
VOU T
PGN D
2
5
PGN D
WAKE
EP
10uf
25V
15
7.6 5 KO
0.1 %
21
13
GND
GND
PWM
16
5.6 M O
1 MO
2.2uF
100 pF
100pF
100 pF
100 pF
100 pF
100p F
Cap s should be l ocated
as c lose as poss ible to
the MC 34845 de vice
0. 1uf
56 pF
COM P
17
2.2nF
10 kO
22 kO
Cont rol
Un it
k
Ω
k
Ω
k
Ω
k
Ω
k
Ω



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