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TDA8351/N4 View Datasheet(PDF) - Philips Electronics

Part Name
Description
View to exact match
TDA8351/N4
Philips
Philips Electronics Philips
TDA8351/N4 Datasheet PDF : 16 Pages
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Philips Semiconductors
DC-coupled vertical deflection circuit
Product specification
TDA8351
PINNING
SYMBOL
Idrive(pos)
Idrive(neg)
VP
VO(B)
GND
VFB
VO(A)
VO(guard)
VI(fb)
PIN
DESCRIPTION
1 input power-stage (positive);
includes II(sb) signal bias
2 input power-stage (negative);
includes II(sb) signal bias
3 operating supply voltage
4 output voltage B
5 ground
6 input flyback supply voltage
7 output voltage A
8 guard output voltage
9 input feedback voltage
handbook, 2 columns
I drive(pos) 1
I drive(neg) 2
VP 3
VO(B) 4
GND 5 TDA8351
V FB 6
VO(A) 7
VO(guard) 8
VI(fb) 9
MBC989
Metal block connected to substrate pin 5.
Metal on back.
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
The vertical driver circuit is a bridge configuration. The
deflection coil is connected between the output amplifiers,
which are driven in opposite phase. An external resistor
(RM) connected in series with the deflection coil provides
internal feedback information. The differential input circuit
is voltage driven. The input circuit has been adapted to
enable it to be used with the TDA9150, TDA9151B,
TDA9160A, TDA9162, TDA8366 and TDA8376 which
deliver symmetrical current signals. An external resistor
(RCON) connected between the differential input
determines the output current through the deflection coil.
The relationship between the differential input current and
the output current is defined by: Idiff × RCON = Icoil × RM.
The output current is adjustable from 0.5 A (p-p) to 3 A
(p-p) by varying RM. The maximum input differential
voltage is 1.8 V. In the application it is recommended that
Vdiff = 1.5 V (typ). This is recommended because of the
spread of input current and the spread in the value of
RCON.
The flyback voltage is determined by an additional supply
voltage VFB. The principle of operating with two supply
voltages (class G) makes it possible to fix the supply
voltage VP optimum for the scan voltage and the second
supply voltage VFB optimum for the flyback voltage. Using
this method, very high efficiency is achieved.
The supply voltage VFB is almost totally available as
flyback voltage across the coil, this being possible due to
the absence of a decoupling capacitor (not necessary,
due to the bridge configuration). Built-in protections are:
thermal protection
short-circuit protection of the output pins (pins 4 and 7)
short-circuit protection of the output pins to VP.
A guard circuit VO(guard) is provided. The guard circuit is
activated at the following conditions:
during flyback
during short-circuit of the coil and during short-circuit of
the output pins (pins 4 and 7) to VP or ground
during open loop
when the thermal protection is activated.
This signal can be used for blanking the picture tube
screen.
1999 Sep 27
4
 

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