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TA9687GN датащи(PDF) 8 Page - O2Micro International Limited.

номер детали TA9687GN
подробное описание детали  LCDM Inverter Controller
PDF  14 Pages
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производитель  O2MICRO [O2Micro International Limited.]
домашняя страница  http://www.o2micro.com/
Logo O2MICRO - O2Micro International Limited.

TA9687GN датащи(HTML) 8 Page - O2Micro International Limited.

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ta9687
CONFIDENTIAL
ta9687-DS-1.0
Page 7
The approximate shutdown delay time is
calculated by the following equation.
]
[
33
.
0
]
[
uF
C
s
T
TIMER
DELAY
×
=
To resume operation, toggle the ENA signal or
restart VDDA.
8. Over-Voltage and Over-Current
Protection
Over-voltage and over-current protection are
monitored by the voltage on VSEN (pin 1).
During normal operation, if a CCFL is damaged
or removed, the voltage at VSEN increases.
Once the voltage at VSEN exceeds the user-
defined, preset voltage set by OVPT (pin 15), the
driver output duty cycle is regulated and the
shutdown delay timer is activated. OVPT sets
the overall protection threshold voltage that is
lower than ~3V (VSEN threshold).
Once the
voltage at TIMR pin reaches ~3V, the IC will shut
down and latch.
OVPT voltage setting is
determined by a resistor divider (R17 and R18)
connected to the OVPT.
The approximate shutdown delay time is
calculated by the following equation.
]
[
33
.
0
]
[
uF
C
s
T
TIMER
DELAY
×
=
To resume operation, toggle the ENA signal or
restart VDDA.
9. Dimming Control
External PWM dimming is implemented by
applying external PWM pulse to PWM (pin 13).
When PWM is higher than 2V, dimming is ON
and vice versa.



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