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TECHNICAL DATA
DC-COUPLED VERTICAL DEFLECTION CIRCUIT
FEATURES
* * * * * * * * Few external components Highly efficient fully DC-coupled vertical output bridge circuit Vertical flyback switch Guard circuit Protection against: - short-circuit of the output pins (7 and 4) - short-circuit of the output pins to VP Temperature (thermal) protection High EMC immunity because of common mode inputs A guard signal in zoom mode.
GENERAL DESCRIPTION
The KKA8351 is a power circuit for use in 90 and 110 colour deflection systems for field frequencies of 50 to 120 Hz. The circuit provides a DC driven vertical deflection output circuit, operating as a highly efficient class G system.
QUICK REFERENCE DATA
SYMBOL DC supply Vp Iq Vertical circuit l o(p-p) I diff(p-p) V diff(p-p) Flyback switch IM Vfb peak output current flyback supply voltage note 1 Thermal data (in accordance with IEC 747-1) T stg lamb Tvj storage temperature operating ambient temperature virtual junction temperature -55 -25 +150 +75 150 C C C 1.5 50 60 A V V output current (peak-to-peak value) differential input current (peakto-peak value) differential input voltage (peak-to-peak value) -- -- -- -- 600 1.5 3 -- 1.8 A A V supply voltage quiescent supply current 9 30 25 V mA PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Note A flyback supply voltage of >50 V up to 60 V is allowed in application. A 220 nF capacitor in series with a 22 resistor (dependent on Io and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling capacitor of VFB has to be connected between pin 6 and pin 3. The supply voltage line must have a resistance of 33 .
1
KKA8351
BLOCK DIAGRAM.
VP VO(guard) VFB
3 +VP
8
6
CURRENT SOURCE
KKA8351
+VP 7 VO(A) +VO(A)
Idrive(pos)
1
-IS +IT -IT 9 VI(fb)
Idrive(neg)
2 +IS +v
+vP
4 VO(B) -VO(B)
5 GND
2
KKA8351
PINNING
SYMBOL I drive(pos) l drive(neg) Vp VO(B) GND Vfb Vo(a) Vo(guard) V|(fb) PIN 1 2 3 4 5 6 7 8 9 DESCRIPTION input power-stage (positive); includes li(sb) signal bias input power-stage (negative); includes li(sb) signal bias operating supply voltage output voltage B ground input flyback supply voltage output voltage A guard output voltage input feedback voltage
PIN CONFIGURATION
Idrive(pos) Idrive(pos) VP VO(B) GND VFB VO(A) VO(guard) VI(fb) 1 2 3 4 5 6 7 8 9 KKA8351
FUNCTIONAL DESCRIPTION The vertical driver circuit is a bridge configuration. The deflection coil is connected between the output amplifiers, which are driven in phase opposition. An external resistor (RM) connected in series with the deflection coil provides internal feedback information. The differential input circuit is voltage driven. 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 x RCON = Icoil x 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). The output circuit is fully protected against the following: * thermal protection short-circuit protection of the output pins (pins 4 and 7) * short-circuit 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.
3
KKA8351
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IRC 134).
SYMBOL DC supply Vp VFB Vertical circuit I O(A) VO(A) Flyback switch IM peak output current 1.5 A output current (peak-to-peak l) output voltage (pin 7) note 2 note 1 3 52 62 A V V supply voltage flyback supply voltage note 1 non-operetion 40 25 50 60 V V V V PARAMETER CONDITIONS MIN. MAX. UNIT
Thermal data (in accordance with IEC 747-1) Tstg lamb Tvj Rth vj-c Rth vj-a tsc storage temperature operating ambient temperature virtual junction temperature resistance vj-case resistance vj-ambient in free air short-circuiting time note 3 -55 -25 +150 +75 150 4 40 1 C C C K/W K/W hr
Notes 1. A flyback supply voltage of >50 V up to 60 V is allowed in application. A 220 nF capacitor in series with a 22 resistor (dependent on Io and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling capacitor of VFB has to be connected between pin 6 and pin 3. The supply voltage line must have a resistance of 33 . 2. IO maximum determined by current protection. 3. UP to VP = 18 V.
4
KKA8351
CHARACTERISTICS
Vp = 17.5 V; Tamb = 25 0C; VFB = 45 V; tj = 50 Hz; II(sb) = 400 A. SYMBOL PARAMETER DC supply VP operating supply voltage VFB flyback supply voltage Iq supply current Vertical circuit VO output voltage swing (scan) CONDITIONS MIN. 9.0 VP VP 19.8 TYP. 30 MAX. 25 50 60 55 UNIT V V V mA V
note 1 no signal; no load Idiff = 0.6 mA (p-p); Vdiff = 1.8 V (p-p); IO = 3 A (p-p) IO = 3 A (p-p); note 2 IO = 50 mA (p-p); note 2 Idiff = 0.3 mA; IO = 1.5 A (M) IO = -1.5 A (M) Idiff = 0.3 mA Idiff = 0; II(sb) = 50 to 500 A Idiff = 0; II(sb) = 50 to 500 A Idiff = 0 Idiff = 0; note 3 notes 4 and 5 note 4
LE VO VDF I Ios I I Vos I VosT VO(A) Gvo
linearity error output voltage swing (flyback) VO(A) - VO(B) forward voltage of the internal efficiency diode (VO(A) - VFB) output offset current offset voltage at the input of the feedback amplifier (VI(fb) - VO(B)) output offset voltage as a function of temperature DC output voltage open-loop voltage gain (V7-4/V1-2)) open loop voltage gain(V7-4/V1-2); V1-2 = 0) voltage ratio V1-2/V9-4 frequency response (-3 dB) current gain (IO/Idiff) current gain drift as a function of temperature signal bias current flyback supply current power supply ripple rejection DC input voltage common mode input voltage input bias current common mode output current
50 0 -
1 1 39 8.0 80 80 0 40 5000 400 80 2.7 0.1 0.2
2 2 1.5 30 18 72 -4 10 500 100 1.6 0.5 -
% % V V mA mV V/K V dB dB dB Hz K A A dB V V A mA
VR tres Gi GCT II(sb) IFB PSRR VI(DC) VICM) Ibias IO(CM)
open loop; note 6
during scan note 7 II(sb)= 0 II(sb)= 0 II(sb) = 300 A (p-p); fi = 50 Hz; Idiff = 0 not active; VO(guard) = 0 V active; VO(guard) = 4.5 V IO = 100 A maximum leakage current = 10 A;
Guard circuit IO output current
1 -
-
50 2.5 5.5 40
A mA V V
VO(guard)
output voltage on pin 8 allowable voltage on pin 8
Notes 1. A flyback supply voltage of >50 V up to 60 V is allowed in application. A 220 nF capacitor in series with a 22 resistor (dependent on Io and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling capacitor of VFB has to be connected between pin 6 and pin 3. The supply voltage line must have a resistance of 33 . 2. The linearity error is measured without S-correction and based on the same measurement principle as performed on the screen. The measuring method is as follows:
5
KKA8351
Divide the output signal I4 - I7 (VRM) into 22 equal parts ranging from 1 to 22 inclusive. Measure the value of two succeeding parts called one block starting with part 2 and 3 (block 1) and ending with part 20 and 21 (block 10). Thus part 1 and 22 are unused. The equations for linearity error for adjacent blocks (LEAB) and not adjacent blocks (NAB) are given below
LEAB = a k - a ( k +1) a avg ; NAB = a max - a min a avg
3. 4. 5. 6. 7.
Referenced to VP. V values with formulae, relate to voltages at or between relating pin numbers, i.e. V7-4/ V1-2 = voltage value across pins 7 and 4 divided by voltage value across pins 1 and 2. V9-4 AC short-circuited. Frequency response V7-4/ V9-4 is equal to frequency response V7-4/ V1-2 . At V(ripple) = 500 mV eff; measured across RM; fj = 50 Hz.
* 9-Pin Plastic Power Single-in-Line (SIL-9MPF, SOT 131-2)
24-0.21
19.8 0.026
4.4
0.15
3.2 0.15
16.8 0.135
2 0.06
1
2.54
9
0.4 0.05
0.65 0.05 0.25 M
12-0.18
6

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