22 MHz Video Amplifier for Large Jumbo Picture Tubes ETV/AN95008 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Abstract This report is the description of a video amplifier board that is intended for the display of high resolution TV and VGA images on the Philips large screen picture tubes using the RGB video processor TDA4780 and the integrated video output amplifier TDA6120. The RGB bandwidth of the total amplifier circuit is 22 MHz. The TDA4780 video controller is I²C controlled, offers automatic cut-off control and special features like blue stretching and gamma control. Note: This report is based upon preliminary data sheets and build with test samples of the TDA6120. Modifications after the date of issue of this report are possible. Purchase of Philips I 2C components conveys a license under the I 2C patent to use the components in the I 2C system, provided the system conforms to the I 2C specifications defined by Philips. © Philips Electronics N.V. 1996 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. 2 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 APPLICATION NOTE 22 MHz Video Amplifier for Large Jumbo Picture Tubes ETV/AN95008 Author(s): J.J. Hekker Product Concept & Application Laboratory Eindhoven, The Netherlands. Keywords Video Amplifier High Resolution Blue Stretch Gamma Control Cut-off Control Date: 16th March, 1996 Pages: 35 3 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Summary This report describes the design of a video amplifier circuit that is intended to drive Philips picture tubes in the PCALE large screen HR Monitor. The total video amplifier circuit consists of the TDA4780 RGB video processor and a video output stage using three TDA6120 integrated output amplifiers. The (-3dB) RGB video bandwidth of the total amplifier circuit is 22 MHz . Note: The video amplifier circuit described in this report is built and tested with preliminary samples of the TDA6120 output amplifier. For this reason this report is considered "classified". 4 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 CONTENTS 1. INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. VIDEO AMPLIFIER DESIGN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 9 The Video Pre-Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1.1 2.1.2 2.1.3 2.2 2.3 3. The Video Output Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2.1 Power Dissipation of the TDA6120 and Heatsink Design. . . . . . . . . . . . . . . . . . . . . . . . . 12 - Calculating the power dissipation (static + dynamic) of the TDA6120: . . . . . . . . . . . . . . 12 Measuring the Power Dissipation of the TDA6120 in practise. . . . . . . . . . . . . . . . . . . . . 13 The Interface between TDA4780 and TDA6120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 POWER SUPPLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.1 4. The TDA4780 Video Pre-Amplifier Input Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Sandcastle input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Beam Current Limiting (BCL) and TDA6120 Thermal Protection. . . . . . . . . . . . . . . . . . . 10 Performance of the Video Amplifier Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 VIDEO AMPLIFIER BOARD SCHEMATIC DIAGRAMS, LAYOUT AND PARTS LISTS. . . . . . . . . . . . . . 17 4.1 4.2 4.3 4.4 Picture Tube Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Video Amplifier Board Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heatsink used on the Video Amplifier Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 17 26 30 5. ACKNOWLEDGMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6. REFERENCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 APPENDIX 1 SPECIFICATION AND PINNING OF THE INTEGRATED CIRCUITS. . . . . . . . . . . . . . . . . . . . . . 32 APPENDIX 2 SPECIFICATION AND TIMING OF ACCEPTED VIDEO DISPLAY MODES. . . . . . . . . . . . . . . . 34 5 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 LIST OF FIGURES Fig. 1 Illustration of cut-off limits and power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 2 Video and Sandcastle inputs of the TDA4780 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 3 Beam Current Limiting TDA4780 and Thermal Protection TDA6120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 4 Circuit design TDA6120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 5 Combining the TDA4780 and TDA6120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 6 Power supply for the video board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 7 Video Pre-Amplifier Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 8 Video Pre-Amplifier (TDA4780) Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 9 Video Output Amplifier (TDA6120) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 10 Video Output Amplifier (TDA6120) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 11 Circuit and Connections of Picture Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 12 Video Amplifier Component Side (Ground Plane and Numbers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 13 Video amplifier with TDA4780 and TDA6120 schematic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 14 Video amplifier component placement (numbers). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 15 Video amplifier component placement (values) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 16 Video amplifier SMD placement (numbers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 17 Video amplifier SMD placement (values) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 18 TDA4780 SMD placement (Numbers) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 19 TDA4780 SMD Placement (Values) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 20 TDA6120 SMD Placement (Numbers) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 21 TDA6120 SMD Placement (Values) Enlarged View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 22 Heatsink for the TDA6120Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 9 10 11 15 15 16 16 16 16 17 18 19 20 21 22 23 24 24 25 25 30 LIST OF TABLES TABLE 1 Pin Description of the TDA4780 Video Processor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 TABLE 2 Pin Description of the TDA6120Q Video Output Amplifier (Preliminary data). . . . . . . . . . . . . . . . . . . . 33 TABLE 3 Performance Demands of an Asymmetrical Video Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 1. Application Note ETV/AN95008 INTRODUCTION. This report describes the video amplifier circuitry incorporating combination of the RGB video processor TDA47801 and the TDA61202 integrated video output amplifier. It contains the circuit diagram, PCB layout and parts list. The amplifier board is designed to drive TV tubes in a high demanding market of HR monitors*. This means that the required bandwidth of the video amplifier has to meet the following standards: VGA, SVGA, XGA, MUSE and other High Resolution sources. A split is made for two different video boards. • One video amplifier board design for typical TV application, using the combination TDA4780 (monolithic RGB processor) and TDA6120. This combination has a total RGB bandwidth of 22 MHz and is suitable for TV, MUSE, VGA (SVGA and XGA with limited performance) and HDMAC images. It features automatic cut-off control, gamma correction and blue stretch. • The other video amplifier board is designed for monitor applications, using the combination TDA48823 video pre-amplifier and TDA6120. This combination has a total RGB bandwidth of 30 - 60 MHz (depending on cathode swing) and is suitable for VGA, SVGA and XGA images. In this report the combination of the TDA4780 and the TDA6120 for TV/VGA applications is described. The video amplifier board with the combination of the TDA4882 and the TDA6120 is described separately in report ETV/AN950074. Erratum: * With the present bandwidth limiting capacitors C40, C41 and C42 the rise cq. fall time of the input signals is limited to 33 ns. For a better video bandwidth performance, the capacitors C40, C41 and C42 should be reduced in value from 150 pF to 56 pF (limiting the rise cq. fall time to 18 ns). When this alteration is made, the speed-up capacitors C101, C201 and C301 should be reduced in value from 22 pF to 15 pF. HR = High Resolution. 7 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 2. Application Note ETV/AN95008 VIDEO AMPLIFIER DESIGN. For the total video board the following design functions and parameters are realised: (For the specification of the TDA6120, the relevant data is given in appendix 1 table 2, this data is based on preliminary data sheets and test samples of the TDA6120) - - Two RGB Video inputs 0.7 Vpp signal amplitude (in 75 Ω) Luminance input 0.45 Vpp (or 1.43 Vpp, can be selected through I²C) Colour difference input -(R-Y) 1.05 Vpp -(B-Y) 1.33 Vpp Contrast control Brightness control RGB Black level control Automatic cut-off control RGB Gain control I²C control Video Output Stages supply voltage of 200 Volt Highest cut-off level 160 Volt (Specification for Philips large screen picture tubes) Maximum output swing 150 Volt (120 Volt video drive and 30 Volt cut-off adjustment range) Bandwidth minimum 22 MHz / 125 Volt (limited by RGB bandwidth of the TDA4780) The video output stage ranges are illustrated in Fig. 1. - The connector pinning is compatible with the other board designs for the HR monitor series. +200 Vidd Maximum Output Voltage of the TDA6120 +190 Volt Ultra Black Range +160 Volt 130 - 160 Volt Cut-Off Range +130 Volt Maximum drive 120 Volt Minimum Output Voltage of the TDA6120 +10 Volt 0 Volt Fig. 1 Illustration of cut-off limits and power supply. 8 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 2.1 Application Note ETV/AN95008 The Video Pre-Amplifier. The pinning of the TDA4780 is given in appendix 1 table 1. The supply voltage is 8 Volt. 2.1.1 The TDA4780 Video Pre-Amplifier Input Circuit. R2 R32 C2 100E 100n R2 R33 C3 100E 100n R34 9 R1 75E R36 C6 100n R6 R37 C7 100E 100n 75E R7 R38 C8 75E J3 FSW2 100n D14 R14 SANDC 1k BAV99 6 3-level sandcastle 100n R13 13 75E FSW1 C10 R40 R41 100E R10 100n 100E C11 10 27 R27 100E 11 100n R11 28 R28 100E C12 R42 SDA SCL 12 100E R12 CLMP 4k7 5 8 100E 75E G1 B1 SUPPLY 7 R8 R1 BLNK R47 GROUND C5 1 75E 100E R49 4k7 100n R4 -(R-Y) Y 14 +8V 4 100E -(B-Y) SANDC IN 2 3 R3 C4 75E 75E G2 B2 2-level sandcastle IC2 TDA4780 C40 C42 C41 150p 150p 150p 100n R10, R11, R12 = (75E) Optional Do Not Place Fig. 2 Video and Sandcastle inputs of the TDA4780 All the video input signals are terminated with 75 Ω to ground, see Fig. 2 (do not place R10, R11 and R12, these resistors are usually placed at another position inside the set e.g. at the BNC input connectors, and therefore not at the video board). The video signals are AC coupled (100 nF SMD) to the inputs of the TDA4780. Capacitors C40, C41 and C42 are added to limit the bandwidth of the input signal. This allows for a more optimal design of the speed-up network (R•01, R•03 and C•01 at the input of the TDA6120) and the SVM circuit (for this circuit see o.a. report ETV/AN930145). 2.1.2 Sandcastle input. The TDA4780 must have a two- or three-level (selected through I²C) sandcastle signal for operation. For use in HR monitors the sandcastle generated on the deflection board is not suitable, because of too much delay. Therefore the 5 Volt blanking and clamping pulses are added with two 4k7 Ω resistors to form a two level sandcastle. When the HR monitors are used for TV images the standard 3 level sandcastle can be used. The sandcastle (2- or 3-level) can be selected with jumper J3. Note: With the two-level sandcastle both blanking and clamping pulse must be present for operation. When no clamping is present, no blanking or constant blanking is required. 9 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 2.1.3 Application Note ETV/AN95008 Beam Current Limiting (BCL) and TDA6120 Thermal Protection. The beam current information is measured at the foot of the EHT winding (see also ETV/AN950066). This information is offered through a diode and a two resistors to pin 15 (average beam current limiting input) of the TDA4780. A fast acting, slow restoring beam current limiting system is made by including a 100 µF capacitor (C26). The initial BCL level is set to approximately 4.2 Volt with resistors R14 and R16. The BCL information is clipped with a 6.8 Volt zener to prevent overdrive on the TDA4780 input. VIDD +8V BCL CON9 PIN3 VIDD R80 10k D16 1N4148 R48 100E TDA4780 Pin15 BCL R84 100E 100n R81 T1 MPSA92 R14 15k R15 1k C80 D2 1N4148 C82 1k D15 C15 R16 100n 22k C26 100u 6V3 D302 BAV21 D102 220n Green Video Blue R83 3k6 T2 MPSA42 D202 BAV21 BAV21 R82 1M tbf BZX79C 6V8 R210 47E C210 Amp. Red C81 220u 16V TDA6120 Fig. 3 Beam Current Limiting TDA4780 and Thermal Protection TDA6120 The network with transistors T1 and T2 is added for thermal protection of the TDA6120. The current through resistor R•10* is a good representation of the total dissipation (Ptot = Pdyn + Pstat) of the TDA6120. This information can be used by the thermal protection circuit, as shown in the network around T1 and T2, to pull down the contrast level when the expected dissipation exceeds a certain level. With the resistor values indicated in Fig. 3 (47 Ω) the voltage over resistors R•10 is limited to 1.2 Volt (by limiting the current through R•10 to approximately 30 mA). This results in a ∆T (with the used heatsink of Fig. 22) of approximately 27 °C. The capacitor C81 (C82 is optional) is used to include a time constant to prevent visible background modulation and loop instability. * R•10 means this resistor is numbered as R110, R210 or R310 for respectively the Red, Green or Blue output stage. 10 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 2.2 Application Note ETV/AN95008 The Video Output Amplifier. The video output stage is built around the TDA6120 integrated video output amplifier. The TDA6120 has a small signal bandwidth of 60 MHz and a large signal bandwidth of 30 MHz. The peripheral circuit around the TDA6120 is shown in Fig. 4. The pinning is given in appendix 1 table 2. REF R35 R104C 10E 20E C101 100n C104 22p R101 R103 560E 560E 4 VIN+ 1 RC3 RC+ RED R102C 2VIN- 20E R112 12 GND 8 OUT 15 OUTC 220E COMPOSITE D103 BAV21 R113 18k PR02 IIN 13 Vdd 10 47E 100n 200V RED feedback Vcc Resistors numbered R***C are a combination of resistors e.g. R107C=R107+R44 R106 6 IC101 TDA6120 VIDD C109 100n 250V 7 OUTM 1k D101 BAV21 R110 C110 R107C RED cathode C105 C106 220n 220n 33E +13V Fig. 4 Circuit design TDA6120. The main features of the TDA6120 are (data based on preliminary data sheets and test samples of the TDA6120): - Large signal bandwidth of 30 MHz at 125 Vpp Small signal bandwidth of 60 MHz at 60 Vpp Rise/fall time of 12.5 ns for 125 Vpp Slew rate of 10 V/ns Static power dissipation of 3.5W at 200 Volt supply (each device) Bandwidth independent of voltage gain Maximum overall voltage gain over 46dB Differential voltage input Fast cathode current measurement output for dark-current control loop. High power supply rejection ratio. The reference of the TDA6120 (VIN+) is 3.9 Volt, see also paragraph 2.3. The output voltage of the TDA6120 is fixed with a feedback resistor R•13. With the value of resistor R•13 = 18 kΩ, an ultra black level of 180 Volt and no differential input voltage, the output voltage of the TDA6120 is 90 Volt. 11 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 2.2.1 Application Note ETV/AN95008 Power Dissipation of the TDA6120 and Heatsink Design. In the circuit described in this report, the bandwidth of the video path is limited by the video preamplifier, the TDA4780. The -3dB bandwidth of this IC is 22 MHz. In practise this means that the maximum worst case condition will be reached around 22 MHz with an amplitude of 100 Volt (The amplitude is limited by a combination of bandwidth, beam current limiting and voltage output of the TDA4780). In the first part of this paragraph the theory on calculating the dissipation and temperature rise of the video amplifiers at normal conditions (pixel on/off at 22 MHz at 100 Volt cathode drive voltage, amplitude is limited by the beam current limiting circuit) is explained. In the second part the more practical approach of driving the TDA6120 to its worst case condition (a combination of maximum output times maximum frequency) is used. Note: These worst case conditions are only reached with the thermal protection circuit disabled. Calculating the power dissipation (static + dynamic) of the TDA6120: The static dissipation (Pstat) of the TDA6120 (datasheet) is due to supply currents and currents in the feedback network and CRT, and can be calculated with equation (1): (1) and: Vidd Vcc = 200 V = 15 V Idd Icc = 14.7 mA = 37 mA (from preliminary data) (from preliminary data) is Pstat = 3.5 Watt The dynamic dissipation (Pdyn) of the TDA6120 can be calculated with equation (2): (2) and: Cl Cf Cint f Vo,pp b = load capacitance (= Ctube + Csocket + Csparkgap + 2 x Cdiode + 2 x CflashR + Ctraces = 4 + 1 + 0.5 + 1.5 + 3 + 0.75 ≈ 11 pF) = feedback capacitance (≈1.5 pF) = effective internal load capacitance (≈ 7 pF, estimate) = frequency = peak to peak output voltage (≈ 100 Volt at 22 MHz normal operation) = non blanking duty-cycle (≈ 0.8) The capacitances indicated in above formula are an educated guess of the capacitance present in the board design and the video end amplifier. then Pdyn = 6.9 Watt 12 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Thermal parameters of the TDA6120 and heatsink: Rth,j-mb Rth,mb-hs Tj,max Ths, max Tamb,tv = = = = = 2.0 K/W 0.5 K/W 150 °C (473 K) 105 °C (368 K)* 65 °C (338 K) (Thermal resistance junction to mounting base) (Thermal resistance mounting base to heatsink) (Maximum junction temperature) (Maximum temperature heatsink) With the total dissipation of 10.4 Watt under normal operating conditions and the thermal parameters of the TDA6120, the thermal resistance of the required heatsink for the maximum temperatures allowed can be calculated with equations (3) and (4). (3) With (3): The maximum junction temperature allowed is 150 °C at 10.4 Watt. This means that the thermal resistance of the heatsink must be smaller than 5.7 K/W. (4) With (4): The maximum heatsink (board) temperature allowed is 105 °C at 10.4 Watt. This means that the thermal resistance of the heatsink must be smaller then 3.8 K/W. The required heatsink area can be derived from the heatsink design nomogram published by PHILIPS COMPONENTS7. For a thermal resistance of 3.8 K/W the required heatsink area is 100 cm². With this heatsink the calculated (equation (3)) maximum junction temperature at 10.4 Watt is < 130 °C (Tamb = 65 °C). On the pc board described in this report, a standard heatsink (shown in Fig. 22) is used. This heatsink has an Rth,hs of 5.6 K/W natural convection (3.75 K/W in continuous air flow). With this heatsink the ∆T under maximum dissipation (10.4 Watt) is 59 °C. The heatsink temperature will rise to 124 °C and the junction temperature to 150 °C. With the above results in mind it is recommended that, to prevent derating of pcb material and for safety, the thermal protection circuit as shown in Fig. 3 is used to limit the heatsink temperature to a maximum of 100 °C (a ∆T of 35 °C). To verify the calculated dissipation and temperature behaviour of the video board, the board has been tested in a HR monitor. * The maximum allowed temperature for FR-2 printed circuit board material is 100°C, for FR-3 pcb material 105°C and for CEM-1 pcb material 120°C. The maximum allowed temperature for soldering joints is 100°C. 13 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Measuring the Power Dissipation of the TDA6120 in practise. All temperature measurements are made with a Minolta infrared temperature sensor at the RED output stage. The RED output stage is physically positioned above the BLUE output stage and thus suffers from a higher ambient temperature. The red output stage is driven to a 90 Volt output swing at 20 MHz (40 MHz pixel frequency; this is the worst case condition that could be reached). Note: This worst case power dissipation is measured with the thermal protection circuit disabled but the beam current limiting circuit enabled. 1 The ambient temperature (Tamb) in the (open) set is 26 °C 2 The voltage over resistor R110 is 5.4 Volt, the high voltage supply Vidd = 189.5 Volt. (5) 3 The voltage over resistor R106 is 1.2 Volt, the low voltage supply Vcc = 12.1 Volt. (6) 4 The temperature of the heatsink of the RED channel is 75 °C. With these practical values for the supply voltages and currents, the true dissipation is calculated to be Ptot = 10.6 Watt (compare calculated total dissipation at 22 MHz/100 V ≈ 10.4 Watt). With the above practical measurements, and the measured ambient temperature Tamb = 26 °C, and a realistic thermal heatsink resistance Rth,hs = 5.6 K/W, a theoretical value for ∆T can be calculated with equation (7). (7) In practise a value of ∆T = 49 °C is found. Conclusion: In any case the PC-board and the TDA6120 junction temperature must be protected by a thermal protection circuit as given in Fig. 3. With the resistor values indicated in Fig. 3 the ∆T of the heatsink is limited to 27 °C (by limiting the voltage over R•10 to 1.2 Volt). In practise the maximum heatsink requirements are lower than those calculated under worst case conditions so that a smaller heatsink can be used. By adapting the resistor values the thermal protection circuit can be optimised for other heatsink sizes. Warning: The used heatsink must have an Rth,hs < 11.4 K/W because of the quiescent Pstat = 3.5 Watt. 14 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 2.3 Application Note ETV/AN95008 The Interface between TDA4780 and TDA6120. TDA4780 TDA6120 +3.9V R35 R104C 10E 4 10E C104 C101 100n 1 19 RED OUT 24 RC- 22p R101 R103 560E 560E OUTC 3 FEEDBACK VIN+ R107C 7 1k R102C 2 12 CATHODE RC+ OUTM VIN- 10E Fig. 5 Combining the TDA4780 and TDA6120. The output signals (R, G, B) of the TDA4780 are between 2 Vpp (typical output voltage difference Black to White level) and a maximum of 3.3 Vpp. This means that to achieve the maximum output amplitude of 150 Vpp at the cathode, the amplification ratio of R•13 over R•03/2 must be > 45. This is done by choosing the value for R•03 = 560 Ω. The value for R•13 = 18 kΩ is fixed (for this see paragraph 2.2). 3. POWER SUPPLY. The supply voltages for the video amplifier board are (see also Fig. 6); - 200 Volt (100 mA) for the TDA6120 (high voltage) video drive with R71 = 10 Ω in series. - 13 Volt (100 mA) for the TDA6120 (low voltage) through R73 = 3 x 68 Ω // and D73, a 13 Volt zener. - 8 Volt (100 mA) for the TDA4780 supply through R5 = 22 Ω and a (IC1 = µA7808) voltage regulator. - 3.9 Volt (14 mA) for the TDA6120 (reference level) through R9 = 820 Ω and D9, a 3.9 Volt zener. VIDD 3 x 68E R73B +16V R5 22E PR02 R9 820E PR01 IC3 7808 C1 C20 100u 100n 25V R73A +3.9 V +8V C22 C13 C14 100n 100u 25V 100n C9 R71 10E NFR25 R73C +13V +200V D2 C72 C73 100u BZX79C 25V 3V9 100n 100u BZX79C 13V 25V D73 C71 10u 250V Fig. 6 Power supply for the video board. Note: Before connecting the video board make sure that both capacitors on the 200 Volt supply, on the SMPS board and C71, are discharged. When this is not done this can result in a fused (R71) resistor. 15 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 3.1 Application Note ETV/AN95008 Performance of the Video Amplifier Board. The video amplifier board was tested in a HR monitor. It is connected to an RGB signal generator with high performance 75 Ω coaxial cable, terminated at the video board with 75 Ω to ground. The four oscilloscope traces are obtained with a Tektronic 500 MHz Digital Oscilloscope. The input signal rise and fall times, measured on the video board with a 10:1 probe, are shown in Fig. 7. For a link to the f-3dB bandwidth see equation (1), appendix 2; specification of video modes. Fig. 7 Video Pre-Amplifier Input Signal. 200 mV / div : 10 ns / div Fig. 8 Video Pre-Amplifier (TDA4780) Output. 500 mV / div : 50 ns / div The output signal of the TDA4780 to the TDA6120 is shown in Fig. 8. The contrast is set for a cathode output voltage swing (black to white) of 60 Volt (Fig. 9) and 125 Volt (Fig. 10), the waveform is measured using a 2.4 pF 100:1 Philips probe. The output of the TDA6120 is measured on the cathode. Fig. 9 Video Output Amplifier (TDA6120) Signal. 10 Volt / div : 50 ns / div Fig. 10 Video Output Amplifier (TDA6120) Signal 20 Volt / div : 50 ns / div The difference in rise and fall times is caused by the speed-up networks. With the output voltage swing of 60 Volt, the 10% to 90% fall time (black to white) is 15.4 ns and the rise time is 20.1 ns, with an overshoot of 17 %. As can be deducted from table 2 appendix 2, these results relate to an excellent performance at 22 MHz pixel frequency down to an acceptable performance at 45 MHz pixel frequency. 16 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 4. 4.1 Application Note ETV/AN95008 VIDEO AMPLIFIER BOARD SCHEMATIC DIAGRAMS, LAYOUT AND PARTS LISTS. Picture Tube Drive. For Electro Magnetic Compatibility reasons, part of the connections to the picture tube go via this picture tube board. Since these lines include Vg1, heater voltage and Aquadag connection it will be clear that precautions must be taken to prevent flash over energy from destroying the sensitive electronics. EHT FOCY FOCX RED 6 GREEN 11 BLUE Vff 8 R75 5E6 PR01 L75 10u R74 1k Vffg J2 L76 10u R76 10 AQUA C75 R78 220p 500V 1k5 COMPOSITE Vg2 C78 1nF 2kV 1k Vg1 12 9 5 7 C79 R79 2k7 COMPOSITE 4n7 1kV C77 AQUA J1 1nF 2kV Fig. 11 Circuit and Connections of Picture Tube The value of heater resistor R75 lies between 2Ω2 and 6Ω8 (dependent on the tube type; for example, a value of 5Ω6 is found for the 29" SF picture tube). It is recommended to optimise resistor R75 for the optimal heater voltage of 6.15 Vrms. 4.2 Video Amplifier Board Design. The final design of the video amplifier board is made on double sided PC-board. Special efforts have been made to keep all current loops (carrying high di/dt signals) as small as possible. This is visible in the copper area shown in Fig. 12 and Fig. 14. On the board there is an option to terminate all grounds (AQUA, GND and Vffg) to the same ground (GND) pin 7 of connector 8 by means of the jumpers J1 and J2 next to capacitor C75 and coil L75. With the HR monitor design the placement of both jumpers gave the best results. 17 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Fig. 12 Video Amplifier Component Side (Ground Plane and Numbers) 18 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes +30V +16V CLMP GND Vsync GND Hsync Hsync Vsync BCL GND SANDC n.c. SDA SCL BLNK CON14 1 +30V 2 +16V 3 4 Red component numbers 1** 5 6 7 R9 820E PR01 CON9 1 22E PR02 R47 4K7 10E C9 2 D16 3 IC1 7808 C1 1N4148 4 +8V C20 100u 100n 25V R48 100E 5 C22 C13 100n 100u 25V D9 R108 R104 10E 10E C104 100n 22p R101 R103 560E 560E 12 1 15 D103 BAV21 R113 18k PR02 3 FOCX FOCY EHT 13 R111 tbf 7 8 R102 R105 9 10 R32 9 R2 8 75E R3 7 5 75E R4 4 75E 6 R33 R34 100E 2 27 C3 100n 3 26 C4 100n 4 25 C5 100n 5 R36 C6 100E C7 100E R38 C8 100E 2 1 R6 R7 R8 C40 75E 75E 75E C41 150p 150p C42 4K7 4K7 +8V IC2 24 TDA4780 6 23 100n 7 22 8 21 9 20 10 19 C11 100n 11 18 C12 100n 12 17 14 15 3 R42 100E R40 100E R41 100E 2 D14 BAV99 1 1 C23 10E R-OUT 220n R22 G-OUT C21 10E 1u +8V R20 3 4 5 6 3 x 75E Optional Do Not Place R12 R11 R10 R44 R107 470E 470E R110 10 200V D101 BAV21 10 9 5 7 12 AQUA D102 BAV21 100n 200V C77 C109 100n 250V 6 R118 tbf R29 C105 3E3 C106 220n 220n R31 330n 10E R43 +8V 10u 250V 220p 3 C19 1k L76 12u R19 100K 4p7 LARGE SIGNAL GROUND (TDA6120) C82 R84 D2 100E 1N4148 tbf J2 8 C78 9 10 1n 1k5 COMPOSITE 2kV J1 VIDSUP N.C. +16V +30V Vff Vff-GND GND AQUA Vg1 Hflyb R79 R81 10k T1 MPSA92 R82 1M R83 3k9 5 6 Vg2 C80 100n C75 C79 220p 4n7 1kV R80 C81 220u 16V 2k7 COMPOSITE R73A R73B 1k PR37322 J.J.H. 6 MAY 1996 Product Concept & Applcation Laboratory Eindhoven T2 MPSA42 4 R75 PR01 7 R78 200V SMALL SIGNAL GROUND (TDA4780) 3 +16V +30V 1k L75 12u R76 Blue component numbers 3** 470E BZX79C 6V8 2 R74 Green component numbers 2** 10E R45 CON8 1 C71 C111 470E R39 100n D15 1n 2kV 10E NFR25 +13V 0E C17 R71 200V R106 Fig. 13 Video amplifier with TDA4780 and TDA6120 schematic diagram. 19 8 6 11 33E C110 7 tbf B-OUT 1 D19 BAV99 2 R112 220E COMPOSITE R119 tbf 2 1k 8 IC101 TDA6120 C107 1u C15 R15 R14 C26 R24 220n 75E J3 100u 6V3 220n C16 16 2 tbf C18 13 10E C102 10E 100n R13 15k R16 22k 100E C25 100n 100n R27 R109 tbf 100E C10 150p R46 R49 28 75E C2 100n R37 10E R28 100E 100E 3 CON10 4 C101 6 CON10SUB R1 GND G1 GND B1 GND C14 100u 100n BZX79C 25V 3V9 R1 R1 GND G1 GND B1 GND B-Y R-Y Y GND R35 R5 R73C +13V 3x120E C72 D73 100n C73 BZX79C 100u 13V 25V +16V R28 R27 IC1 C1 R2 GND G2 GND B2 GND B-Y R-Y Y GND R5 R9 + D9 R35 C9 R31 R38 R46 IC2 R39 R20 D201 D203 BNC1 BNC2 BNC3 R84 CON10 D15 AQUA J4 C111 C211 C311 CON14 PRODUCT CONCEPT & APPLICATION PCALE LABORATORY PR37322 EINDHOVEN R212 BLUE C78 D202 R49 R47 R32 R33 R34 CON10SUB R36 R37 J3 C13 + RED VG2 GREEN J5 R112 PRODUCT CONCEPT & EINDHOVEN APPLICATION LABORATORY 4 JUNE 1996 PR37322 R78 HEAT2 + CON9 R312 R213 R43 R1 R113 D103 R313 CON8 J1 L75 C79 D303 R75 C109 IC101 J2 C71 L76 C309 IC301 R210 BLNK SCL SDA N.C. SAND GND BCL VS HS R48 R44 R40 R41 R42 G1 IC201 D16 R310 T1 C83 R82 R83 T2 C81 R81 R80 D302 PR37322 HEAT1 R110 D102 HEAT3 + D101 D301 C75 R45 B1 GND R1 GND GND G1 GND GND B1 GND R71 Hfb Vg1 AQUA GND Vffg Vff +30V +16V N.C. VIDD C77 R79 HS GND VS GND CLMP +16V +30V + C209 D2 C73 + R73A R73C R73B 20 D73 Fig. 14 Video amplifier component placement (numbers). + R2 GND G2 GND B2 GND B-Y R-Y Y GND 100u 25V PRO2 22E 100u 25V + 100E 100E uA7808 PR02 + 9-PIN 4k7 100E 100E 100E 100E 100E 100E 10E PR02 18k BNC TDA4780 47E 10E BNC 6-PIN BNC BZX79C6V8 220p TPECNOC TCUDORP & N O I T A CILPPA PCALE Y R O T A PR37322ROBAL NEVOHDNIE 220p 470E 10u 1kV 4n7 GREEN 220E 5E6 PR01 10u 100n 250V 1M 100n 1k BAV21 MPSA92 10k BAV21 3k6 MPSA42 220u 16V 250V 10u 10-PIN 2kV 1n RED 100n 7-PIN 220p 1k5 100E 47E 10E BAV21 4k7 1N4148 4k7 BZX79C3V9 25V 470E G1 100u 470E 100E 820E 220E BLUE 1n 2kV TDA6120Q BLNK SCL SDA N.C. SAND GND BCL VS HS 10-PIN BAV21 100E PR02 18k BAV21 220p 250V HS GND VS GND CLMP +16V +30V 100E R1 220E 2k7 PR02 18k BAV21 BAV21 BAV21 TDA6120Q 47E TDA6120Q 47E 10E BAV21 100E + NFR25 Hfb Vg1 AQUA GND Vffg Vff +30V +16V N.C. VIDD B1 GND R1 GND GND G1 GND GND B1 GND + 22373RP 1N4148 250V 68E PRODUCT CONCEPT & EINDHOVEN APPLICATION LABORATORY 4 JUNE 1996 PR37322 68E 21 100u 25V + Fig. 15 Video amplifier component placement (values) 68E 22 MHz Video Amplifier for Large Jumbo Picture Tubes BZX79C13V 100n Philips Components Application Note ETV/AN95008 Philips Components Application Note ETV/AN95008 R3 R4 C205 C14 C3 C4 C5 D19 C8 R29 D14 C18 R201 C201 R16 C15 C17 C16 + C10 C40 C11 C41 C12 C42 R10 C204 C7 R14 R207 R203 C6 C21 R11 R22 R13 R12 R24 R208 C26 R205 R204 C19 R202 R19 R219 C2 C25 C23 R211 R218 C207 C206 C202 R209 R206 C210 R6 R1 R8 R2 R7 C22 C20 PR37322 22 MHz Video Amplifier for Large Jumbo Picture Tubes PRODUCT CONCEPT & APPLICATION LABORATORY EINDHOVEN R15 C304 C105 C106 R74 C110 R307 R304 R302 R319 C307 R303 R311 R318 R308 C301 R301 C302 C102 R109 R102 R119 R309 R104 R118 R103 R111 R305 R107 C101 R101 C107 R108 R105 C104 R76 C305 C306 C310 R306 R106 C82 C72 Fig. 16 Video amplifier SMD placement (numbers) 22 Philips Components Application Note ETV/AN95008 75E 75E 75E 75E 100n 75E 75E 100n PR37322 22 MHz Video Amplifier for Large Jumbo Picture Tubes 75E 100n 100n 100n BAV99 100n 150p 100n 150p 100n 150p 75E 1u 100n 330n BAV99 1u 0E 560E 22p + 75E 100n 75E 220n PRODUCT CONCEPT & APPLICATION LABORATORY EINDHOVEN 1k 75E 10E 100u 6V3 10E 10E 4p7 10E 15k 470E 560E 220n 22k 10E 100n 680p 100k tbf tbf 10E 100n 220n tbf 470n 470n tbf 100n 100n 33E tbf tbf 100n 200V tbf 10E 470n 470n tbf 10E 470E 560E tbf 10E tbf 100n 470n 470n 200V 1k 22p 560E 1k 100n 200V tbf tbf tbf tbf tbf 10E 10E 470E 560E tbf 10E tbf 10E 10E 22p 560E tbf 100n 100n 33E 33E tbf 100n Fig. 17 Video amplifier SMD placement (values) 23 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 R24 R22 R29 C15 C22 C20 C18 C17 C16 R15 C14 C19 R1 C5 D19 R14 C25 R16 C23 C21 R19 D14 R2 R13 C2 C3 C4 C6 C7 C8 C10 C11 C12 R3 CONCEPT C26 R4 C40 C41 C42 + R6 R7 R8 R12 R11 R10 Fig. 18 TDA4780 SMD placement (Numbers) Enlarged View. 100n 0E 1u 10E 10E 100n 100n 100n 1u 220n 220n 220n 1k 100k 330n 4p7 22k 15k 75E 680p BAV99 BAV99 75E 75E 75E 100n 100n + 75E 75E 100u 6V3 75E 75E 75E 150p 100n 150p 100n 100n 100n 100n 150p 100n 100n CONCEPT 75E 75E Fig. 19 TDA4780 SMD Placement (Values) Enlarged View. 24 Philips Components Application Note ETV/AN95008 R206 C205 R218 C207 C206 C202 R202 R205 R204 R208 R219 R211 C210 R209 PR 22 MHz Video Amplifier for Large Jumbo Picture Tubes R207 R203 C204 R201 C201 PR Fig. 20 TDA6120 SMD Placement (Numbers) Enlarged View. 33E tbf 10E tbf tbf 470n 470n 10E tbf tbf tbf 100n 200V 470E 560E 560E 22p Fig. 21 TDA6120 SMD Placement (Values) Enlarged View. 25 10E 10E 100n Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 4.3 Application Note ETV/AN95008 Parts List. 22 MHz VIDEO AMPLIFIER FOR LARGE JUMBO PICTURE TUBES PR37322 Diodes Component value D2 D16 D9 D15 D14 D19 D73 D101 D102 D103 D201 D202 D203 D301 D302 D303 1N4148 BZX79C3V9 BZX79C6V8 BAV99 BZX79C13V type BAV21 12 n.c. Number DO35 DO35 DO35 SOT23 DO35 9330-839-90153 9331-176-90153 9331-177-50153 9332-153-70212 9331-178-30133 2 1 1 2 1 DO35 9331-892-10153 9 Integrated Circuits Component value type T1 T2 MPSA92 MPSA42 PNP NPN Component value type IC1 IC2 IC101 IC201 IC301 µA7808 TDA4780 TDA6120Q 12 n.c. Number 1 1 Integrated Circuits 12 n.c. 8 Volt regulator RGB pre-amplifier Video output amplifier Number 1 1 3 Miscellaneous Component value type J1 J2 J3 J4 J5 Wire 1E 3-pin jumper Wire 6E Wire 4E Wire BNC1 BNC2 BNC3 Coax terminator CON8 CON9 CON10B CON10 CON14 10-PIN 9-PIN 10-PIN 6-PIN 7-PIN L75 L76 10µ SOCKET DAF-SOCKET 26 12 n.c. Number Wire Wire 2 1 1 1 2 Legs vertical mount 3 CON10 CON9 CON10 CON6 CON7 1 1 1 1 1 COIL 2 CRT_DAF 1 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 PARTS-LIST 22 MHz VIDEO AMPLIFIER FOR LARGE JUMBO PICTURE TUBES PR37322 Electrolytic Capacitors Component value range 12 n.c. Number C1 C9 C13 C73 C71 C81 100u 10u 220u 25V 250V 16V 2222-037-90047 2222-044-63109 2222-037-56221 Component value type C26 100u 6V3 Component value range 12 n.c. C83 C109 C209 C309 100n 100n 63V 250V 2222-370-??104 2222-370-35104 Component value range 12 n.c. C75 C111 C211 C311 C77 C78 C79 220p 1n 4n7 500V 2kV 1kV 2222-655-03221 value type 100n 100n 1u 330n 4p7 220n tbf 22p tbf C0805 C1206 C1210 C1206 C0805 C1206 C1812 C0805 C0805 2222-910-16649 2222-591-16641 2222-882-16663 2222-591-16647 2222-861-12478 2222-591-16645 2222-???-????? 2222-861-12229 2222-???-????? 19 2 2 1 1 3 1 3 3 470n tbf 100n 200V C1210 C0603 C1812 2222-882-16558 2222-???-????? 2222-944-16649 6 3 3 4 1 1 Electrolytic Capacitors (SMD) 12 n.c. Number 1 Film Capacitors Number 1 3 Ceramic Capacitors Number 4 2 1 Ceramic Capacitors (SMD) Component C2 C3 C4 C5 C6 C7 C8 C10 C11 C12 C15 C15 C20 C22 C72 C104 C204 C304 C14 C72 C16 C18 C17 C19 C21 C23 C25 C82 C101 C201 C301 C102 C202 C302 C105 C106 C205 C206 C305 C306 C107 C207 C307 C110 C210 C310 27 12 n.c. Number Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Resistors (SMD) Application Note ETV/AN95008 PARTS-LIST 22 MHz VIDEO AMPLIFIER FOR LARGE JUMBO PICTURE TUBES PR37322 Component R1 R2 R3 R4 R6 R7 R8 R13 R10 R11 R12 R14 R15 R74 R76 R16 R19 R22 R24 R102 R104 R105 R108 R202 R204 R205 R208 R302 R304 R305 R308 R29 R101 R103 R201 R203 R301 R303 R106 R206 R306 R107 R207 R307 R109 R111 R118 R119 R209 R211 R218 R219 R309 R311 R318 R319 value type 12 n.c. Number 75E do not place (Optional 75E) 15k 1k 22k 100k R0805 R0805 R0805 R0805 R0805 R0805 2322-730-??759 2322-730-??759 2322-730-??153 2322-730-??102 2322-730-??223 2322-730-??104 8 3 1 3 1 1 10E 0E R0805 R0805 2322-730-??109 2322-730-??009 18 1 560E 33E 470E R0805 R1206 R1206 2322-730-??561 2322-710-??339 2322-710-??471 6 3 3 tbf R0603 2322-730-????? 16 Resistors (Standard, Non-Flammable and Power) Component value type R5 R9 R20 R31 R35 R39 R27 R28 R48 R32 R33 R34 R36 R37 R38 R40 R41 R42 R84 R43 R44 R45 R46 R47 R49 R71 R73A R73B R73C R75 R78 R79 R80 R81 R82 R83 R110 R210 R310 R112 R212 R312 R113 R213 R313 22E 820E 10E 100E PRO2 PR01 SFR16 SFR16 2322-1??-??229 2322-193-??821 2322-180-??109 2322-180-??101 1 1 4 3 100E 470E 4k7 10E 68E 5E6 1k5 2k7 1k 10k 1M 3k9 47E 220E 18k SFR25 SFR16 SFR16 NFR25 SFR25 PR01 Carbon Composite Carbon Composite SFR16 SFR16 SFR16 SFR16 SFR16 Carbon Composite PR02 2322-181-??101 2322-180-??471 2322-180-??472 2322-205-??109 2322-181-??689 2322-193-??568 10 3 3 1 3 1 1 1 1 1 1 1 2 3 3 28 12 n.c. 2322-180-??102 2322-180-??103 2322-180-??105 2322-180-??392 2322-180-??479 2322-1??-??183 Number Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Overview of the used components in numerical order. Capacitors C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C25 C26 C71 C72 C73 C75 C77 C78 C79 C81 C82 C83 C101 C102 C104 C105 C106 C107 C109 C110 C111 C201 C202 C203 C204 C205 C207 C209 C210 100u 25V 100n 100n 100n 100n 100n 100n 100n 100u 25V 100n 100n 100n 100u 25V 100n 100n 1u 330n 1u 4p7 100n 220n 100n 220n 220n 100u 6V3 10u 250V 100n 100u 25V 220p 1n 2kV 1n 2kV 4n7 1kV 220u 16v tbf 100n 63V 22p tbf 100n 470n 470n tbf 100n 250V 100n 200V 220p 22p tbf 470n 100n 470n tbf 100n 250V 100n 200V Capacitors (continued) Resistors C211 C301 C302 C304 C305 C306 C307 C309 C310 C311 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R19 R20 R22 R24 R27 R28 R29 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R71 R73A R73B R73C R74 R75 R76 R78 R79 R80 R81 220p 22p tbf 100n 470n 470n tbf 100n 250V 100n 200V 220p Connectors BNC1 Coaxial Terminator BNC2 Coaxial Terminator BNC3 Coaxial Terminator CON8 10-PIN CON9 9-PIN CON10B 10-PIN CON10 6-PIN CON14 7-PIN Diodes D5 D9 D14 D15 D16 D19 D73 D101 D102 D103 D201 D202 D203 D301 D302 D303 1N4148 BZX79C3V9 BAV99 BZX79C6V8 1N4148 BAV99 BZX79C13V BAV21 BAV21 BAV21 BAV21 BAV21 BAV21 BAV21 BAV21 BAV21 Integrated Circuits IC1 IC2 IC101 IC201 IC301 µA7808 TDA4780 TDA6120Q TDA6120Q TDA6120Q Wire Wounds L75 L76 10µ 10µ 29 Resistors (continued) 75E 75E 75E 75E 22E PRO2 75E 75E 75E 820E PR01 Optional 75E Optional 75E Optional 75E 75E 15k 1k 22k 100k 10E 10E 10E 100E 100E 0E 10E 100E 100E 100E 10E 100E 100E 100E 10E 100E 100E 100E 470E 470E 470E 4k7 4k7 100E 4k7 10E NFR25 68E 68E 68E 1k 5E6 PR01 1k 1k5 AB 2k7 AB 1k 10k R82 R83 R84 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R118 R119 R201 R202 R203 R204 R205 R206 R207 R208 R209 R210 R212 R213 R218 R219 R301 R302 R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R313 R318 R319 1M 3k9 100E 560E 10E 560E 10E 10E 33E 470E 10E tbf 47E tbf 220E AB 18k PR02 tbf tbf 560E 10E 560E 10E 10E 33E 470E 10E tbf 47E 220E AB 18k PR02 tbf tbf 560E 10E 560E 10E 10E 33E 470E 10E tbf 47E tbf 220E AB 18k PR02 tbf tbf Transistors T1 T2 MPSA92 MPSA42 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 4.4 Application Note ETV/AN95008 Heatsink used on the Video Amplifier Board. 37.5 65 M3 M3 11.5 8.75 20 8.75 8.3 11.1 15.2 11.1 ALL MEASUREMENTS IN MM 8.3 M3 M3 24 Fig. 22 Heatsink for the TDA6120Q The heatsink shown in Fig. 22 is a standard heatsink that can be found with most manufacturers. The drilled holes are to be taped with M3. 30 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 5. Application Note ETV/AN95008 ACKNOWLEDGMENT. This project was done with help of the following people: F. v.d. Zanden R. v.d. Linden D. Teuling J. Hulshof 6. Mounting PC boards and demo board assembly Mounting PC boards and demo board assembly Consultancy Consultancy REFERENCES. 1. TDA4780 IC02b 1995 RGB video processor with automatic cut-off control and gamma adjust 2. TDA6120 DATASHEET Video Output Amplifier 3. TDA4882 IC02b 1995 Advanced monitor video controller 4. ETV/AN95007 Video Amplifier for HR Monitor with TDA4882 and TDA6120 by J.J. Hekker 5. ETV/AN93015 Scan Velocity Modulation for HDTV Monitors by H.J.C. Büthker 6. ETV/AN95006 Large Screen Deflection Board by J.J.M. Hulshof 7. Technical Long-life mounting for l.f. power transistors, Publication 227 PHILIPS COMPONENTS Technical Publication 227 31 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 APPENDIX 1 SPECIFICATION AND PINNING OF THE INTEGRATED CIRCUITS. The TDA4780. The TDA4780 is a monolithic integrated circuit with a luminance and a colour difference interface for video processing in TV receivers. Its primary function is to process the luminance and colour difference signals. The required inputs are: - luminance and negative colour difference signals. 2- or 3-level sandcastle pulse for internal timing pulse generation. I²C-bus data and clock signals. TABLE 1 Pin Description of the TDA4780 Video Processor. Pin 1 2 Function Parameters Fast switch 2 input select Y - CD / RGB1 select RGB2 I²C control bits FSDIS2,FSON2 0.0 - 0.4 Vdc 0.9 - 5.5 Vdc RED input 2 0.7 Vpp Pin Function Parameters 15 Average beam current limiting input start brightness reduction start contrast reduction 2.5 Vdc 4.0 Vdc Peak limiting storage capacitor start brightness reduction start contrast reduction 2.5 Vdc 4.0 Vdc 16 3 GREEN input 2 0.7 Vpp 17 Storage capacitor for leakage current compensation 4 BLUE input 2 0.7 Vpp 18 Peak dark storage capacitor 5 Supply Voltage Vp Supply Current 8.0 Vdc ± 10% 100 - 120 mA 19 Cut-off measurement input maximum charge/discharge current 6 Colour Difference -(B-Y) 75% colour bar 1.33 Vpp 20 BLUE output black to white maximum output current / amplitude 7 Colour Difference -(R-Y) 75% colour bar 1.05 Vpp 21 Blue cut-off storage capacitor 8 Luminance input Y I²C control bit YHI = 0 I²C control bit YHI = 1 22 0.45 Vpp 1.43 Vpp GREEN output black to white maximum output current / amplitude 9 Ground Ground 23 Green cut-off storage capacitor 10 RED input 1 0.7 Vpp 24 BLUE output black to white maximum output current / amplitude 11 GREEN input 1 0.7 Vpp 25 Blue cut-off storage capacitor 12 BLUE input 1 0.7 Vpp 26 Y-output/hue adjust output YEXH = 1 Hue (DAC 03) set > 28HEX YEXH = 0 min - max output voltage 13 Fast switch 1 input select Y - CD select RGB1 I²C control bits FSDIS1,FSON1 27 0.0 - 0.4 Vdc 0.9 - 5.5 Vdc 32 I²C bus serial data input/acknowledge output 400 µA 1.7 - 2.3 Vpp nominal 5 mA typical / 3.3 Volt 1.7 - 2.3 Vpp nominal 5 mA typical / 3.3 Volt 1.7 - 2.3 Vpp nominal 5 mA typical / 3.3 Volt 0.85 - 1.15 Vpp 0.05 - 5.50 V -0.1 - Vp Volt Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes 14 Sandcastle pulse input Horizontal and vertical blanking Horizontal pulses 2.0 - 3.0 Vdc 4.0 - 4.9 Vdc Application Note ETV/AN95008 28 33 I²C bus serial clock input -0.1 - Vp Volt Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 Two sets of RGB colour signals can also be inserted. The TDA4780 has I²C bus control of all parameters and functions with automatic cut-off control of the picture tube cathode currents. It provides RGB output signals for the video output stages. In clamped output mode it can also be used as an RGB source. The TDA4780 offers two separate RGB video input channels at a (-3dB) bandwidth of 22 MHz. The TDA6120. The TDA6120QQ is a single 30MHz/120Vpp monolithic video output amplifier in a DBS13P (Dil Bended Sil 13 pins Power) package SOT141RDG using high-voltage DMOS technology, and is intended to drive the cathodes of a CRT in High Definition TV’s or monitors. The TDA6120 is a new video output amplifier IC with a small signal (60 Volt swing) bandwidth of 60 MHz and a large signal (125 Volt swing) bandwidth of 30 MHz. TABLE 2 Pin Description of the TDA6120Q Video Output Amplifier (Preliminary data). Pin Function Description typical min max unit 1 RC- inverting input pre-emphasis network 0 Vcc V 2 VIN- inverting voltage input 0 Vcc V 3 RC+ non-inverting input pre-emphasis network 0 Vcc V 4 VIN+ non-inverting voltage input 0 Vcc V 5 IIN feedback current input 0 2Vbe V 6 Vcc low supply voltage 12 0 24 V 7 OUTM cathode current measurement output 8 Ground power ground & heatsink 9 n.c. 10 Vidd 200 0 280 V 11 n.c. 12 OUTC cathode output 10 Vidd-10 V 13 OUT feedback current output (Rfb = 20 kΩ) 0 10 mA 5 high supply voltage 34 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes Application Note ETV/AN95008 APPENDIX 2 SPECIFICATION AND TIMING OF ACCEPTED VIDEO DISPLAY MODES. With the following formula the desired picture performance (fall time, black to white transition time) can be calculated (with α = 0.35). The results are shown in table 3. (1) TABLE 3 Performance Demands of an Asymmetrical Video Amplifier. Resolution ; Pixel Frequency / Video Response Mode Pixels Excellent (pi = 1) Medium (pi = 0.75) Acceptabl e (pi = 0.5) Horizontal Frequency (kHz) Pixel Frequency (MHz) tfall tfall tfall (Hor x Vert) Vertical Frequency (Hz)* (ns) (ns) (ns) VGA 640 x 480 60 31.5 25 14.00 18.62 28.00 VGA (16:9)** 853 x 480 60 31.5 34 10.29 13.73 20.59 VGA 640 x 480 90 48 40 8.75 11.67 17.50 VGA (16:9) 853 x 480 90 48 54 6.48 8.64 12.96 VGA 640 x 480 120 64 55 6.36 8.47 12.73 VGA (16:9) 853 x 480 120 64 74 4.73 6.31 9.46 SVGA 800 x 600 56 35.4 36 9.72 12.96 19.44 SVGA (16:9) 1067 x 600 56 35.4 48 7.29 9.72 14.58 SVGA 800 x 600 72 48 50 7.00 9.33 14.00 SVGA (16:9) 1067 x 600 72 48 67 5.22 6.96 10.45 SVGA 800 x 600 100 64 69 5.07 6.76 10.14 SVGA (16:9) 1067 x 600 100 64 92 3.80 5.07 7.61 XGA 1024 x 768 87 (i) 35.5 46 7.61 10.14 15.22 XGA (16:9) 1365 x 768 87 (i) 35.5 61 5.74 7.64 11.48 XGA 1024 x 768 60 48 64 5.47 7.29 10.94 XGA (16:9) 1365 x 768 60 48 85 4.12 5.49 8.24 XGA 1024 x 768 80 64 88 3.98 5.30 7.95 XGA (16:9) 1365 x 768 80 64 118 2.97 3.95 5.93 HVGA 1152 x 864 70 64 99 3.54 4.71 7.07 HVGA(16:9) 1536 x 864 70 64 132 2.65 3.54 5.30 * When (i) then interlaced mode, all others non-interlaced ** 16:9 means square pixels on a 16:9 aspect ratio picture tube. 35 Philips Components 22 MHz Video Amplifier for Large Jumbo Picture Tubes WIDE* * 1848 x 1040 60 (i) Application Note ETV/AN95008 31.5 73 4.79 6.39 9.59 The WIDE mode is a computer graphics version of the HDTV mode. This mode is specifically suitable for the display of for example high resolution Photo CD images. 36