ILA3654,ILA3654Q VERTICAL DEFLECTION AND GUARD CIRCUIT (110°) GENERAL DESCRIPTION The ILA3654 is a full performance vertical deflection output circuit for direct drive of the deflection coils and can be used for a wide range of 90° and 110° deflection systems. A guard circuit is provided which blanks the picture tube screen in the absence of deflection current. FEATURES · Direct drive to the deflection coils · 90° and 110° deflection system · Internal blanking guard circuit · Internal voltage stabilizer QUICK REFERENCE DATA Output voltage Output current (peak-to-peak) Supply voltage Guard circuit output voltage Operating ambient temperature range Storage temperature V5-2 I5(p-p) V9-2 V7-2 Tamb Tstg THERMAL RESISTANCE From junction to mounting base Rth j-mb 3,5 to 4 K/W BLOCK DIAGRAM. . Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: [email protected] URL: www.bms.by max. max. max. max. 60 V 3A 40 V 5,6 V -25 to +60 °C -55 to +150 °C ILA3654,ILA3654Q FUNCTIONAL DESCRIPTION Output stage and protection circuits The output stage consists of two Darlington configurations in class B arrangement. Each output transistor can deliver 1,5 A maximum and the VCEO is 60 V. Protection of the output stage is such that the operation of the transistors remains well within the SOAR area in all circumstances at the output pin, (pin 5). This is obtained by the cooperation of the thermal protection circuit, the current-voltage detector and the short circuit protection. Special measures in the internal circuit layout give the output transistors extra solidity. The supply for the output stage is fed to pin 6 and the output stage ground is connected to pin 4. Driver and switching circuit Pin 1 is the input for the driver of the output stage. The signal at pin 1 is also applied to pin 3 which is the input of a switching circuit (pin 1 and 3 are connected via external resistors). This switching circuit rapidly turns off the lower output stage when the flyback starts and it, therefore, allows a quick start of the flyback generator. The maximum required input signal for the maximum output current peak-to-peak value of 3 A is only 3 V, the sum of the currents in pins 1 and 3 is then maximum 1 mA. Flyback generator During scan, the capacitor between pins 6 and 8 is charged to a level which is dependent on the value of the resistor at pin 8 (see Fig.1). When the flyback starts and the voltage at the output pin (pin 5) exceeds the supply voltage, the flyback generator is activated. The supply voltage is then connected in series, via pin 8, with the voltage across the capacitor during the flyback period. This implies that during scan the supply voltage can be reduced to the required scan voltage plus saturation voltage of the output transistors. The amplitude of the flyback voltage can be chosen by changing the value of the external resistor at pin 8. It should be noted that the application is chosen such that the lowest voltage at pin 8 is > 1,5 V, during normal operation. Guard circuit When there is no deflection current, for any reason, the voltage at pin 8 becomes less than 1 V, the guard circuit will produce a d.c. voltage at pin 7. This voltage can be used to blank the picture tube, so that the screen will not burn in. Voltage stabilizer The internal voltage stabilizer provides a stabilized supply of 6 V to drive the output stage, so the drive current is not affected by supply voltage variations. Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: [email protected] URL: www.bms.by ILA3654,ILA3654Q RATINGS Voltages Output voltage Supply voltage Supply voltage output stage Input voltage Input voltage switching circuit External voltage at pin 7 Vs.4 Vg-4 Ve.4 Vl-2 Va.2 V7-2 O to 60 O to 40 O to 60 0 to Vg-4 0 to Vs.4 0 to 5,6 V V V V V V Currents Repetitive peak output current ±l5RM Non-repetitive peak output ±l5SM current (note 1) Repetitive peak output current of IBRM flyback generator max. max. 1.5 3 A A max. +1,5 A Non-repetitive peak output ±l8SM current of flyback generator (note 1) Temperatures Storage temperature range Ts,g Operating ambient temperature range Operating junction temperature Tj range (the output current at pin 5 should not exceed 2.5A) max. - 1.6 3 A A -65 to + 150 -25 10 + 60 °C "C -25to+ 150 °C ILA3654 or ILA3654Q Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: [email protected] URL: www.bms.by