MC34270 Datasheet, PDF (2/12 Pages) Motorola, Inc – LIQUID CRYSTAL DISPLAY AND BACKLIGHT INTEGRATED CONTROLLER

MC34270 MC34271
Representative Block Diagram
Vin
EL
Panel
EL
Control
µP Control
From DAC
VB
SW1
32
On/Off ^EN1
26
VDD
Circuit #1
PWM
D1
7
S1
6
ELD
Drv1
9
8
÷2
Sync 31
ELD
EN
OSC
VDD
VDD ₁₁
Mode
Vin
RT 30
VRef
27
Ref1 ₂
FB1
3
Comp1
4
EN2
25
Vref
1.25 V
Circuit #2
PWM
10
D2
18 S2
19
VB
17
VB
Ref2
FB2 23
22
Comp2
V0
16
V0
V1
15
V1
21
V2
V2
14
BIAS Output
VA = 5.0 V
28
BIAS
Buffers
V3
13
V3
Gnd
29
V4
12
V4
This device contains 350 active transistors.
2
MOTOROLA ANALOG IC DEVICE DATA