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TECHNICAL DATA DC-coupled vertical deflection circuit
The KKA8356 is a power circuit for use in 90o and 110o 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. 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
PINNING
SYMBOL PIN DESCRIPTION
Idrive(pos) Idrive(neg) VP VO(B) GND VFB VO(A) VO(guard) VI(fb)
1 2 3 4 5 6 7 8 9
input power-stage (positive); includes II(sb) signal bias input power-stage (negative);includes II(sb) signal bias operating supply voltage output voltage B ground input flyback supply voltage output voltage A guard output voltage input feedback voltage
BLOCK DIAGRAM
1
KKA8356
QUICK REFERENCE DATA
3
SYMBOL PARAMETER DC supply VP supply voltage Iq quiescent supply current Vertical circuit I O(p-p) output current (peak-to-peak value) I diff(p-p) differential input current (peak-to-peak value) V diff(p-p) differential input voltage (peak-to-peak value) Flyback switch IM peak output current VFB flyback supply voltage Thermal data Tstg storage temperature Tamb operating ambient temperature Tvj virtual junction temperature
MIN. 9 55 25
TYP. 4.5 30 600 1.5
MAX. 25 2 1.8 +1 50 +150 +75 150
UNIT V mA A A V A V
o o
C C o C
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 xRCON = Icoil xRM.The output current is adjustable from 0.5 A (p-p) to 2 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.
2
KKA8356
LIMITING VALUES
SYMBOL DC supply VP PARAMETER supply voltage CONDITIONS non-operating note 1 55 25 MIN. VFB flyback supply voltage Vertical circuit IO(p-p) output current (peak-to-peak value) VO(A) output voltage (pin 7) Flyback switch IM peak output current Thermal data Tstg storage temperature Tamb operating ambient temperature Tvj virtual junction temperature Rth vj-c resistance vj-case Rth vj-a resistance vj-ambient in free air tsc short-circuiting time
Notes
MAX. 40 25 50 2 52 +1.5 +150 +75 150 4 40 1
UNIT V V V A V A C C o C K/W K/W hr
o o
note 2
1. IO maximum determined by current protection. 2. Up to VP = 18 V.
CHARACTERISTICS
VP = 14.5 V; Tamb = 25 C; VFB = 45 V; fi = 50 Hz; II(sb) = 400 A; unless otherwise specified.
SYMBOL PARAMETER DC supply VP operating supply voltage VFB flyback supply voltage IP supply current Vertical circuit VO output voltage swing (scan) LE VO VDF |Ios| |Vos| VosT VO(A) Gvo CONDITIONS MIN. 9.0 VP 13.2 6.5 80 TYP. 4.5 30 1 1 40 MAX. 25 50 55 4 4 1.5 40 24 72 UNIT V V mA V % % V V mA mV V/K V dB
no signal; no load
Idiff = 0.6 mA (p-p); Vdiff = 1.8 V (p-p); IO = 2 A (p-p) linearity error IO = 2 A (p-p); IO = 50 mA (p-p); Idiff = 0.3 mA; output voltage swing (flyback) V O(A) - VO(B) IO = 1 A (M) forward voltage of the internal IO = 1 A (M); efficiency diode (VO(A) - VFB) Idiff = 0.3 mA output offset current Idiff = 0; II(sb) = 50 to 500 A offset voltage at the input of the Idiff = 0; feedback amplifier (VI(fb) - VO(B)) II(sb) = 50 to 500 A output offset voltage as a function Idiff = 0 of temperature DC output voltage Idiff = 0; open-loop voltage gain (V7-4/V1-2)
3
KKA8356
open loop voltage gain (V7-4/V9-4; 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 open loop; 50 0 80 0 40 5000 400 80 2.7 0.1 0.2 10-4 500 100 1.6 0.5 dB dB Hz K A A dB V V A mA A mA V V
VR fres GI GcT II(sb) IFB PSRR VI(DC) VI(CM) Ibias IO(CM)
during scan
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 VO(guard) output voltage on pin 8 allowable voltage on pin 8
1

50 2.5 5.5 40
VP = 13.5 V; IO(p-p) = 1.87 A; II(sb) = 400 A; Idiff(p-p) = 500 A; VFB = 42 V; tFB = 0.6 ms.
APPLICATION DIAGRAM.
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KKA8356
* 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
5

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