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Ordering number : ENN7877
Monolithic Linear IC
LA7848
TV Vertical Output + E/W Driver
with Bus Control Support
Overview
The LA7848 is a vertical deflection plus EW driver IC for high image quality TV and CRT displays that supports the use
of a bus control system signal-processing IC. The sawtooth waveform from the bus control system signal-processing IC
can directly drive the deflection yoke (including the DC component). The LA7848 also provides a parabolic waveform
output that can similarly be used to drive the diode modulator block.
Functions
•
Built-in pump-up circuit for low power dissipation.
•
Vertical output circuit.
•
Excellent crossover characteristics.
Specifications
Maximum Ratings
Parameter Symbol Conditions Ratings Unit
Supply voltage +B6 max 45 V
Output block supply voltage +B3 max 92
Allowable power dissipation Pd max Mounted on an arbitrarily large heat sink. 9 W
Deflection output current I2 max -1.5 to +1.5 Ap-o
EW drive current *1 I10 max V10 = 1.5V +0.5 Ap-o
EW drive voltage *2 V10 max I10 = 10µA45V
Thermal resistance θj-c 4 °C /W
Operating temperatur e Topr -20 to +85 °C
Storage temperature Tstg -40 to +150 °C
Note: The EW driver is used within the range that connects the two points *1 and *2.
at Ta = 25°C
V
90705 MS OT B8-5526 No.7 877-1/6
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LA7848
Operating Conditions
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage +B6 30 V
Operating supply voltage range +B6op
Deflection output current I2p-p
EW drive current I10
Operating Characteristics
Parameter Symbol Conditions
Deflection output saturation
voltage (lower)
Deflection output saturation
voltage (upper)
Pump-up charge saturation
voltage
Pump-up discharge saturation
voltage
Idling current Idl
Midpoint voltage Vmid
EW drive saturation voltage Vsat10-1 I10 = 500mA
at Ta = 25°C
at Ta = 25°C, +B = 30V
Vsat2-1 I2 = 1.1A
Vsat3-2 I2 = -1.1A
Vsat7-1 I7 = 20mA
Vsat6-7 I7 = -1.1A
16 to 43 V
To 2.2 Ap-p
To 0.4 Ap-o
Ratings
min typ max
1.5 V
3.2 V
1.8 V
3.2 V
15 50 mA
14.0 15.0 16.0 V
1.5 V
Note: Current flowing into the IC is positive (+) and current flowing out is negative (-).
Unit
Package Dimensions
unit : mm
3248A
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Block Diagram
LA7848
Test Circuit Diagrams
1. Output saturation voltage (lower) Vsat2-1
Figure 1
In the circuit in figure 1, read the value shown by the voltage meter (V) when the current meter (A) reads 1.1A.
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LA7848
2. Output saturation voltage (upper) Vsat3-2
Figure 2
In the circuit in figure 2 with the output from pin 2 absorbed by an electronic load and read the value shown by the
voltage meter (V) when the current meter (A) reads 1.1A.
3. Charge pump charge saturation voltage Vsat7-1
Figure 3
In the circuit in figure 3, read the value shown by the voltage meter (V) when the current meter (A) reads 20mA.
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LA7848
4. Charge pump discharge saturation voltage Vsat6-7
Figure 4
In the circuit in figure 4 with the output from pin 7 absorbed by an electronic load, read the value shown by the
voltage meter (V) when the current meter (A) reads 1.1A.
7. Idling current Idl
8. Midpoint voltage Vmid
Figure 5
In the circuit in figure 5, read the value shown by the current meter (A).
In the circuit in figure 5, read the value shown by the voltage meter (V).
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9. EW drive saturation voltage Vsat10-1
Figure 6
LA7848
In the circuit in figure 6, read the value shown by the voltage meter (V) when the current meter (A) reads 500mA.
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Information (i ncluding circuit diagrams and circuit par ameters) herein is f or example only; it is not
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This catalog provi des information as of September, 2005. Specifications and inform ation herein are subject
to change without notice.
PS No.7877-6/6
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