Sanyo EP58B - Manual (Page 17)

31 32 SANYO TV . VCR SANYO TV . VCR
LA78045
1 2 3 4 5 6 7
AMP
Thermal
Protection Pump UP
+
-
GND
Ver.OUTPUT
OUTPUT STAGE V
CC
NON INV.INPUT
INVERTING INPUT
V
CC
PUMP UP OUT
LA7875N/76N
1 2 3 4 5 6 7 8 9 10
AMP
Pump UP1
Pump UP2
+
-
GND N.C
V
CC
2
2nd PUMP UP OUT
Ver.OUTPUT
OUTPUT STAGE V
CC
NON INV.INPUT
INVERTING INPUT
V
CC
1st PUMP UP OUT
Block Diagram Block Diagram
Overview
Functions
Overview
Functions
Vertical Output IC Vertical Output ICs
The LA78045 is a vertical deflection output IC for high-definition TV and CRT displays in systems that use a bus control system
signal-processing IC. This IC can directly drive (including the DC component) the deflection yoke from the sawtooth wave output
from the bus control system signal-processing IC. The color TV vertical deflection system adjustment function can be controlled
from the bus system when this IC is used in conjunction with a SANYO LA768X or LA769XX series TV bus control system
signal-processing IC.
The LA78045 provides a maximum deflection current of 2.2 A p-p, and thus is optimal for large diameter CRTs, and can drive the
CRTs used in TV sets in the 33 to 37 inch range.
Low power operation achieved by using integrated charge pump circuit
Vertical output circuit
Thermal protection circuit
Excellent crossover characteristics
Supports DC coupling
Package: TO220-7H
The LA7875N and LA7876N were developed for Internet TVs and high-definition TVs that require a narrow vertical retrace period.
In these products, SANYO succeeded in achieving a narrow vertical retrace period by adopting a new 3_ step-up charge pump circuit.
Since this allows the supply voltage to be lowered relative to the earlier 2_ step-up ICs, it achieves significantly lower power in end
product designs.
Furthermore, since this IC can directly drive (including the DC component) the deflection yoke from the sawtooth wave output from
the bus control system signal-processing IC, the shift operation required by wide-screen TV sets can be controlled over the bus control
system.The LA7875N provides a maximum deflection current of 2.2 A p-p, and thus is optimal for medium diameter CRTs, and the
LA7876N provides a maximum deflection current of 3.0 A p-p, and thus is optimal for large diameter CRTs.
3 voltage step up charge pump circuit
Low power operation
Operational amplifier type vertical output circuit
Supports DC direct coupling deflection yoke drive
Excellent crossover characteristics
Packages: LA7875N: SIP10HD
LA7876N: SIP10H