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Sanyo
Sanyo

LA7838 Datasheet

Vertical Deflection Circuit with TV / CRT Display Drive


LA7838 Datasheet Preview


Ordering number:ENN3313C
www.DataSheet4U.com
Monolithic Linear IC
LA7837, 7838
Vertical Deflection Circuit
with TV/CRT Display Drive
Overview
The LA7837, 7838 are vertical deflection output ICs de-
veloped for use in high-grade TVs and displays. The inter-
lace and crossover distortion responses, in particular, have
been greatly improved, allowing excellent picture quality
on large size televisions and high precision interlace mode
displays.
Also, pulse signals can be used for input signals due to the
on-chip sawtooth wave generating circuit and driver cir-
cuit. Further, the DC and AC feedback circuit can be formed
with these ICs alone, simplifying pattern design of sets and
ensuring stable performance. All of the functions in a color
TV signal system can be processed by connecting these
ICs with SANYO’s single-chip IC LA7670 series (NTSC)
and LA7680/85 series (PAL/NTSC) (VIF/SIF, video,
chroma, deflection).
The LA7837 has a maximum deflection current of 1.8Ap-
p, making it appropriate for use in portable to mid-size tele-
visions.
The LA7838 has a miximum deflection current of 2.2Ap-
p, so it can be used for large size sets, and can drive from
33 to 37 inches.
Package Dimensions
unit:mm
3107-SIP13H
[LA7837, 7838]
25.6
3.4 10.0
2.0
2.4
1
0.8 2.0
0.5
13
0.4
1.15 1.2
SANYO : SIP13H
Features
• Low power dissipation due to on-chip pump-up circuit.
• On-chip 50/60Hz vertical size control circuit.
• On-chip sawtooth wave generating circuit.
• On-chip driver circuit.
• Vertical output circuit.
• On-chip thermal protection circuit.
• Excellent interlace response.
• Excellent crossover response.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
12501TN (KT)/71693TS/8251TS(KOTO)/2090TA, TS(AF) No.3313–1/9
Page 1

LA7837, 7838
Specifications
www.DataSheet4U.com
Maximum Ratings at Ta = 25˚C
Parameter
Driver supply voltage
Pump-up supply voltage
Output supply voltage
Deflection output current
Thermal resistance
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
Conditions
+VCC1 max
+VCC8 max
+VCC13 max
IDEF
θj-c
Pd max With infinite heat sink
Topr
Tstg
Ratings
15
30
62
–1.5 to +1.5
4
8
–20 to +85
–40 to +150
Unit
V
V
V
Ap-o
˚C/W
W
˚C
˚C
Operating Conditions at Ta = 25˚C, parenthesis ( ) indicates LA7838.
Parameter
Recommended driver supply voltage
Operating driver supply voltage
Recommended pump-up supply voltage
Operating pump-up supply voltage
Deflection output current
Operating ramp waveform pulse height
Symbol
+VCC1
+VCC1
+VCC8
+VCC8
I12p-p
V6p-p
Conditions
Ratings
12
8 to 14
24
10 to 27
up to 1.8 (2.2)
up to {(+B1/3)–1.0}
Unit
V
V
V
V
Ap-p
Vp-p
Operating Characteristics at Ta = 25˚C, +VCC1=12V, +VCC8=24V, parenthesis (
Parameter
Symbol
Conditions
Driver supply current
Trigger input threshold voltage
Vertical amplitude control pin voltage
Ramp waveform Generation start voltage
Pump-up charge saturation voltage
Pump-up discharge saturation voltage
Deflection output saturation voltage (lower)
Deflection output saturation voltage (upper)
Idling current
Voltage gain
ICC1
V2
V4
VRAMP
Vs9-11
Vs8-9
Vs12-11
Vs13-12
IDL
I9=20mA
I9=0.9A
(I9=1.1A)
I12=0.9A
(I12=1.1A)
I12=0.9A
(I12=1.1A)
) indicate LA7838.
Ratings
min typ
5.6 6.7
2.6 2.9
5.9 6.1
4.6 4.9
35
59
max
7.8
3.2
6.3
5.2
1.8
3.0
(3.2)
1.2
(1.5)
3.2
(3.5)
65
Unit
mA
V
V
V
V
V
V
V
V
V
V
mA
dB
No.3313–2/9
Page 2

LA7837, 7838 Interface Circuit
www.DataSheet4U.com
LA7837, 7838
LA7837, 7838 Pin Connection Diagram and Block Diagram
No.3313–3/9
Page 3

LA7837, 7838
Sample Application Circuits for 14” Color TV
www.DataSheet4U.com
Fig. 1 +VCC1, 12V
Fig. 2 +VCC1, 9V
No.3313–4/9
Page 4
Part Number LA7838
Manufactur Sanyo
Description Vertical Deflection Circuit with TV / CRT Display Drive
Total Page 9 Pages
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