MC34270 Datasheet, PDF (8/12 Pages) Motorola, Inc – LIQUID CRYSTAL DISPLAY AND BACKLIGHT INTEGRATED CONTROLLER

MC34270 MC34271
Figure 12. Auxiliary Supply Configuration
SW1
32
DS1
1
EN1
ÎÎ ₂₆
VDD
8 Drv1
÷2
31 Sync
Circuit #1 Bias Supply
En
S
Q
R
÷N
OSC
D1
7
S1 ₆
ELD
9
VDD
11
Mode
12 V
– 27 V
VDD
5.0 V to 16 V
169 k
30 RT
Vref
27 ^{1.25 V}
2 ^Ref1
12 V
VB
3 _FB1
4 Comp1
SS1
5
LCD
Contrast
DAC
Ref2
23
22 FB2
Comp2
21 _SS2
20
S
Q
R
En
ÎÎÎVDD
VDD2
Circuit #2
Bias Supply
10
D2
18
S2 19
VB
17
V0
V0
16
VB
6.0 V to 30 V
DS2
24
V1
V1
15
25 EN2
VA
28
BIAS
V2
14
VDD2
V3
13
V2
V3
LCD
Display
Gnd
29
VDD2
V4
V4
12
8
MOTOROLA ANALOG IC DEVICE DATA