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Ordering number : ENN7877
Monolithic Linear IC
LA7848
Overview
TV Vertical Output + E/W Driver with Bus Control Support
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 at Ta = 25C
Parameter Supply voltage Output block supply voltage Allowable power dissipation Deflection output current EW drive current *1 EW drive voltage *2 Thermal resistance Operating temperature Storage temperature Symbol +B6 max +B3 max Pd max I2 max I10 max V10 max j-c Topr Tstg V10 = 1.5V I10 = 10A Mounted on an arbitrarily large heat sink. Conditions Ratings 45 92 9 -1.5 to +1.5 +0.5 45 4 -20 to +85 -40 to +150 Unit V V W Ap-o Ap-o V C /W C C
Note: The EW driver is used within the range that connects the two points *1 and *2.
90705 MS OT B8-5526 No.7877-1/6
LA7848
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating supply voltage range Deflection output current EW drive current +B6 +B6op I2p-p I10 Symbol Conditions Ratings 30 16 to 43 To 2.2 To 0.4 Unit V V Ap-p Ap-o
Operating Characteristics at Ta = 25C, +B = 30V
Ratings Parameter Deflection output saturation voltage (lower) Deflection output saturation voltage (upper) Pump-up charge saturation voltage Pump-up discharge saturation voltage Idling current Midpoint voltage EW drive saturation voltage Idl Vmid Vsat10-1 I10 = 500mA 15 14.0 15.0 Vsat6-7 I7 = -1.1A Vsat7-1 I7 = 20mA Vsat3-2 I2 = -1.1A Symbol Vsat2-1 I2 = 1.1A Conditions min typ max 1.5 3.2 1.8 3.2 50 16.0 1.5 V V V V mA V V Unit
Note: Current flowing into the IC is positive (+) and current flowing out is negative (-).
Package Dimensions
unit : mm 3248A
No.7877-2/6
LA7848
Block Diagram
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.
No.7877-3/6
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.
No.7877-4/6
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).
No.7877-5/6
LA7848
9. EW drive saturation voltage Vsat10-1 Figure 6
In the circuit in figure 6, read the value shown by the voltage meter (V) when the current meter (A) reads 500mA.
! Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
! SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design.
! In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law.
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mechanical, including photocopying and recording, or any information storage or retrieval system, of otherwise, without the prior written permission of SANYO Electric Co., Ltd.
! Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use.
! Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or h ih f hi d i This catalog provides information as of September, 2005. Specifications and information herein are subject to change without notice.
PS No.7877-6/6

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