Read Sharp 28JW-73H (serv.man12) Service Manual online
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CHARACTERISTICS
T
T
amb
= 25
°
C; V
CC
= 15 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing
into the IC; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX. UNIT
Start-up current source (pin 8)
I
i(DRAIN)
supply current drawn from drain pin
V
CC
= 0 V; V
DRAIN
> 100 V
1.0
1.2
1.4
mA
with auxiliary supply;
V
V
DRAIN
> 100 V
−
100
300
µ
A
BV
DSS
breakdown voltage
650
−
−
V
M-level
mains-dependent operation-enabling level
60
−
100
V
V
CC
management (pin 1)
V
CC(start)
start-up voltage on V
CC
10.3
11
11.7
V
V
CC(UVLO)
under voltage lock-out on V
CC
8.1
8.7
9.3
V
V
CC(hys)
hysteresis voltage on V
CC
V
CC(start)
−
V
CC(UVLO)
2.0
2.3
2.6
V
I
i(VCC)H
pin V
CC
charging current
V
DRAIN
> 100 V; V
CC
< 3V
−
1.2
−
1
−
0.8
mA
I
i(VCC)L
pin V
CC
charging current
V
DRAIN
> 100 V;
3 V < V
CC
< V
CC(UVLO)
−
1.2
−
0.75
−
0.45 mA
I
VCC(restart)
pin V
CC
restart current
V
DRAIN
> 100 V;
V
CC(UVLO)
< V
CC
< V
CC(start)
−
650
−
550
−
450
µ
A
I
CC(operate)
supply current under normal operation
no load on pin DRIVER
1.1
1.3
1.5
mA
Demagnetization management (pin 4)
V
DEM
demagnetization comparator threshold
voltage on pin DEM
voltage on pin DEM
50
100
150
mV
I
DEM
pin DEM current
V
DEM
= 50 mV
−
50
(1)
−
0
nA
V
clamp(DEM)(neg)
negative clamp voltage on pin DEM
at I
DEM
=
−
150
µ
A
−
0.5
−
0.25
−
0.05 V
V
clamp(DEM)(pos)
positive clamp voltage on pin DEM
at I
DEM
= 250
µ
A
0.5
0.7
0.9
V
t
suppr
suppression of transformer ringing at start
of secondary stroke
of secondary stroke
1.1
1.5
1.9
µ
s
Pulse width modulator
t
on(min)
minimum on-time
−
t
leb
−
ns
t
on(max)
maximum on-time
latched
40
50
60
µ
s
Oscillator
f
oscL
oscillator low frequency (fixed frequency)
V
CTRL
> 1.5 V
5
6.5
8
kHz
f
oscH
oscillator high frequency (fixed frequency) V
CTRL
< 1 V
145
175
205
kHz
V
vco(start)
peak voltage at pin I
sense
, where
frequency reduction starts
see Fig.6
−
75
−
mV
V
vco(max)
peak voltage at pin I
sense
, where the
frequency is equal to f
oscL
−
50
−
mV
Duty cycle control (pin 3)
V
CTRL(min)
min. voltage on CTRL (max. duty cycle)
−
1.0
−
V
V
CTRL(max)
max. voltage on CTRL (min. duty cycle)
−
1.5
−
V
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