TECHNICAL DATA DC-coupled vertical deflection circuit The KKA8356 is a power circuit for use in 90o and 110ocolour 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 Idrive(pos) Idrive(neg) VP VO(B) GND VFB VO(A) VO(guard) VI(fb) PIN 1 2 3 4 5 6 7 8 9 DESCRIPTION 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. TYP. MAX. UNIT 9 4.5 30 25 V mA 2 A 600 1.5 1.8 µA V +1 50 A V 55 25 +150 +75 150 o C C o C o 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 CONDITIONS supply voltage non-operating MIN. MAX. 40 25 50 V V V 2 A 52 V +1.5 A 55 25 +150 +75 150 4 40 1 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 UNIT note 1 note 2 o C C o C K/W K/W hr o Notes 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 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 µA offset voltage at the input of the Idiff = 0; feedback amplifier (VI(fb) - VO(B)) II(sb) = 50 to 500 µA output offset voltage as a function Idiff = 0 of temperature DC output voltage Idiff = 0; open-loop voltage gain (V7-4/V1-2) MIN. TYP. MAX. UNIT 9.0 VP 4.5 30 25 50 55 V V mA 13.2 V 1 1 40 4 4 % % V 1.5 V 40 mA 24 mV 72 µV/K 6.5 80 V dB 3 KKA8356 VR fres GI ∆GcT II(sb) IFB PSRR VI(DC) VI(CM) Ibias IO(CM) 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 Guard circuit IO output current VO(guard) output voltage on pin 8 allowable voltage on pin 8 80 dB 0 40 5000 dB Hz 10-4 K open loop; during scan II(sb) = 0 II(sb) = 0 ∆II(sb) = 300 µA (p-p); fi = 50 Hz; Idiff = 0 not active; VO(guard) = 0 V active; VO(guard) = 4.5 V IO = 100 µA maximum leakage current = 10 µA; 50 0 400 80 2.7 0.1 0.2 500 100 1.6 0.5 µA µA dB V V µA mA 50 µA 2.5 5.5 40 mA V V 1 VP = 13.5 V; IO(p-p) = 1.87 A; II(sb) = 400 µA; Idiff(p-p) = 500 µA; VFB = 42 V; tFB = 0.6 ms. APPLICATION DIAGRAM. 4 KKA8356 • 9-Pin Plastic Power Single-in-Line (SIL-9MPF, SOT 131-2) 24-0.21 4.4 0.15 12-0.18 19.8 0.026 16.8 0.135 3.2 0.15 1 9 2.54 2 0.06 0.4 0.05 0.65 0.05 0.25 M 5