TDA4855 Datasheet, PDF (16/44 Pages) NXP Semiconductors – Autosync Deflection Controller ASDC

Philips Semiconductors
Autosync Deflection Controller (ASDC)
Preliminary specification
TDA4855
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
HORIZONTAL FLYBACK INPUT [HFLB (PIN 1)]
V_HFLB
I_HFLB
positive clamping level
negative clamping level
positive clamping current
negative clamping current
I_HFLB = 5 mA
I_HFLB = −1 mA
V_HFLB
slicing level
Output stage for line driver pulses [HDRV (pin 7)]
−
5.5
−
V
−
−0.75 −
V
−
−
6
mA
−
−
−2
mA
−
2.8
−
V
OPEN COLLECTOR OUTPUT STAGE
V_HDRV
I_{leakage(HDRV)}
saturation voltage
output leakage current
I_HDRV = 20 mA
I_HDRV = 60 mA
V_HDRV = 16 V
−
−
0.3
V
−
−
0.8
V
−
−
10
µA
AUTOMATIC VARIATION OF DUTY FACTOR
t_HDRV(OFF)/t_H
relative t_OFF time of HDRV
I_HDRV = 20 mA;
42
45
48
%
output; measured at
f_H = 31.45 kHz; see Fig.9
V_HDRV = 3 V; HDRV duty factor _{IHDRV = 20 mA;}
45
46.3 47.7 %
is determined by the relation _{fH = 57 kHz; see Fig.9}
I_HREF/I_VREF
I_HDRV = 20 mA;
46.6 48
49.4 %
f_H = 90 kHz; see Fig.9
X-ray protection [XRAY (pin 2)]
V_XRAY
t_W(XRAY)
R_I(XRAY)
V_RESET(VCC)
slicing voltage level
minimum width of trigger pulse
input resistance at XRAY
(pin 2)
supply voltage for reset of
X-ray latch
V_XRAY < 6.38 V + V_BE
V_XRAY > 6.38 V + V_BE
6.14 6.38 6.64 V
10
−
−
µs
500
−
−
kΩ
−
5
−
kΩ
−
5.6
−
V
Vertical oscillator (oscillator frequency in application without adjustment of free-running frequency f_v(o))
f_V
free-running frequency
R_VREF = 22 kΩ;
40
42
43.3 Hz
C_VCAP = 100 nF
f_v(o)
vertical frequency catching
constant amplitude;
50
−
110
Hz
range
notes 8, 9 and 10
V_VREF
voltage at reference input for
vertical oscillator
−
3.0
−
V
t_d(scan)
delay between trigger pulse VGA presets active
500
575
650
µs
and start of ramp at VCAP
(pin 24) (width of vertical
VGA presets disabled
240
300
360
µs
blanking pulse)
I_VAGC
control currents of amplitude
control
±120 ±200 ±300 µA
C_VAGC
external capacitor at VAGC
(pin 22)
−
−
150
nF
1996 Jul 18
16