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34844 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc

Part # 34844
Description  10 Channel LED Backlight Driver with Integrated Power Supply
PDF  36 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34844 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
9
34844
ELECTRICAL CHARACTERISTICS
OVER-VOLTAGE PROTECTION
Over-voltage Clamp - OVP Register Table:
OVP = Fh
OVPFH
60.5
62.5
64.5
V
OVP = Eh
OVPEH
56.5
58
60
V
OVP = Dh
OVPDH
53
54
56
V
OVP = Ch
OVPCH
49
51
52.5
V
OVP = Bh
OVPBH
45
47
48.5
V
OVP = Ah
OVPAH
41
43
44.5
V
OVP = 9h
OVP9H
38
39
40.5
V
OVP = 8h
OVP8H
34
36
37.5
V
OVP = 7h
OVP7H
30.5
32
33.5
V
OVP = 6h
OVP6H
26
28
30
V
OVP = 5h
OVP5H
23
24
25
V
OVP = 4h
OVP4H
19
20
21
V
OVP = 3h
OVP3H
15
16
17
V
OVP = 2h
OVP2H
11
12
13
V
Over-voltage threshold,
Set by Hardware, Voltage at A0/SEN
OVPHW
6.15
6.5
6.85
V
A0/SEN Sink Current
ISINK_OVP
-
100
-
μA
BOOST
Switching Frequency (BST [1:0]=0)
fSW0
0.14
0.15
0.17
MHz
Switching Frequency (BST [1:0]=1)
fSW1
0.27
0.30
0.33
MHz
Switching Frequency (BST [1:0]=2)
fSW2
0.54
0.60
0.66
MHz
Switching Frequency (BST [1:0]=3)
fSW3
1.08
1.2
1.32
MHz
Minimum Duty Cycle
DMIN
-
10
15
%
Maximum Duty Cycle
DMAX
80
85
-
%
Soft Start Period
tSS
-
6.5
-
ms
Boost Switch Rise Time(9)
tTR
-
15
-
ns
Boost Switch Fall Time(9)
tF
-
25
-
ns
Notes
10.
Guaranteed by design
Table 3. Electrical Characteristics (continued)
Characteristics noted under conditions VIN = 12V, VOUT = 42V, ILED = 50mA, PWM = VDC1, M/~S = VDC1,
PIN & NIN = VDC1, -40
°C ≤ TA ≤ 105°C, PGND = 0V, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit



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