TDA4857PS Datasheet, PDF (18/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors

Philips Semiconductors
I²C-bus autosync deflection controller for
PC monitors
Product specification
TDA4857PS
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
AUTOMATIC VARIATION OF DUTY CYCLE; see Fig.14
t_HDRV(OFF)/t_H
relative t_OFF time of HDRV
output; measured at
V_HDRV = 3 V; HDRV duty cycle
is modulated by the relation
I_HREF/I_VREF
I_HDRV = 20 mA;
f_H = 31.45 kHz
I_HDRV = 20 mA;
f_H = 58 kHz
I_HDRV = 20 mA;
f_H = 110 kHz
42
45
48
%
45.5 48.5 51.5 %
49
52
55
%
X-ray protection: pins XRAY and XSEL
V_XRAY(sl)
t_W(XRAY)(min)
R_i(XRAY)
slicing voltage level for latch
minimum width of trigger pulse
input resistance at pin 2
V_XRAY < 6.38 V + V_BE
V_XRAY > 6.38 V + V_BE
standby mode
6.22 6.39 6.56 V
−
−
30
µs
500
−
−
kΩ
−
5
−
kΩ
−
5
−
kΩ
XRAY_rst
reset of X-ray latch
pin 9 open-circuit or
connected to GND
set control bit SOFTST via −
the I²C-bus
pin 9 connected to V_CC via switch off V_CC then
−
R_XSEL
re-apply V_CC
V_{CC(XRAY)(min)}
minimum supply voltage for pin 9 connected to V_CC via −
−
4
V
correct function of the X-ray R_XSEL
latch
V_{CC(XRAY)(max)}
maximum supply voltage for pin 9 connected to V_CC via 2
−
reset of the X-ray latch
R_XSEL
R_XSEL
external resistor at pin 9
no reset via I²C-bus
56
−
−
V
130
kΩ
Vertical oscillator [oscillator frequency in application without adjustment of free-running frequency f_fr(V)]
f_fr(V)
free-running frequency
R_VREF = 22 kΩ;
40
42
43.3 Hz
C_VCAP = 100 nF
f_cr(V)
vertical frequency catching
constant amplitude; note 7 50
−
160
Hz
range
V_VREF
voltage at reference input for
vertical oscillator
−
3.0
−
V
t_d(scan)
delay between trigger pulse
and start of ramp at VCAP
(pin 24) (width of vertical
blanking pulse)
control bit VBLK = 0
control bit VBLK = 1
220
260
300
µs
305
350
395
µs
I_VAGC
amplitude control current
control bit AGCDIS = 0
control bit AGCDIS = 1
±120 ±200 ±300 µA
−
0
−
µA
C_VAGC
external capacitor at VAGC
(pin 22)
150
−
220
nF
2000 Jan 31
18