LA76835 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LA76835 Datasheet PDF : 50 Pages
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Deflection Block Test Conditions
Parameter
Horizontal free-running
frequency
Symbol
fH
Test point
31
Horizontal pull-in range
fH PULL
52
Horizontal output
pulse length
Hduty
31
Horizontal output pulse
V Hsat
saturation voltage
31
Horizontal
M
HAFCM
AFC control
30
current
H
HAFCH
L
HAFCL
Horizontal output pulse
HPHCEN
31
52
LA76835NM
Input signal
Y IN:
No signal
Y IN: Hori-
zontal/
vertical sync
signal
Y IN: Hori-
zontal/
vertical sync
signal
Y IN: Hori-
zontal/
vertical sync
signal
Y IN: Hori-
zontal/
vertical sync
signal
Y IN:
No signal
Y IN: Hori-
zontal/
vertical sync
signal
Test method
Connect a frequency counter to the output of pin
31 (H out) and measure the horizontal free-running
frequency.
Using an oscilloscope, monitor the horizontal sync
signal which is input to the Y IN (pin 52) and the pin
31 output (H out) and vary the horizontal signal
frequency to measure the pull-in range.
Measure the voltage for the pin 31 horizontal
output pulse’s low-level period.
Bus conditions
Measure the voltage for the pin 31 horizontal
output pulse’s low-level period.
Measure the current incoming into pin 30 hori-
zontal AFC filter.
AFCGAIN: 0
Measure the current incoming into pin 30 hori-
zontal AFC filter.
Measure the current incoming into pin 30 hori-
zontal AFC filter.
Measure the delay time T from the rise of the pin
31 horizontal output pulse to the fall of the Y IN
horizontal sync signal.
HPHCEN (ns) = (T-9.0us)×1000
T
AFCGAIN: 1
AFCGAIN: 0
20IRE
Horizontal position
adjustment range
HPHrange
Horizontal output
2.5V
Y IN: Hori-
With H PHASE set at 0, 16, and 31, measure the H PHASE: 00000
31
zontal/
delay time from the rise of the pin 31 horizontal
H PHASE: 11111
vertical sync output pulse to the fall of the Y IN horizontal sync
signal
52
signal and measure the adjustment range.
(Determine the difference from HPHASE16.)
Measuring
20IRE
Horizontal output
Continued on next page.
No.7962-31/50
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