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LM2426TE 데이터시트(PDF) 6 Page - National Semiconductor (TI) |
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LM2426TE 데이터시트(HTML) 6 Page - National Semiconductor (TI) |
6 / 12 page Typical Performance Characteristics (V CC = +180VDC,VBB = +8VDC,CL = 8pF, VOUT = 110VPP (55V − 165V), Test Circuit - Figure 3 unless otherwise specified) (Continued) TABLE 1. Power Dissipation for Various Video Patterns Power Dissipation (W) Pattern Format 480i 480p 720p 1080i Raster 2.4 2.4 2.4 2.4 Full White Field 6.1 6.1 6.0 6.5 White Box, 75% Screen Size 4.6 4.6 4.0 4.2 Gray Bars 4.8 4.8 4.7 5.0 Color Bars 75% Amplitude 3.9 4.0 4.0 4.1 Color Bars 100% Amplitude 4.3 4.3 4.3 4.5 SMPTE Color Bars 3.8 3.8 3.8 4.0 SMPTE 133 5.0 5.2 5.4 5.7 Cross Hatch 16x12 2.8 3.0 3.0 2.9 Resolution Chart 5.3 5.5 5.6 5.8 Multiburst 5.4 6.6 10.1 10.9 White Text on Black Background 5.2 7.1 11.1 12.3 Windows Pattern 4.0 4.5 6.4 6.6 Windows Pattern 4.7 5.2 6.7 7.0 Windows Pattern 6.0 6.7 8.6 9.4 Vertical Lines 5 On 5 Off 5.1 5.9 8.7 9.5 Vertical Lines 4 On 4 Off 5.3 6.3 9.8 10.8 Vertical Lines 3 On 3 Off 5.6 7.0 11.7 12.9 Vertical Lines 2 On 2 Off 6.3 8.5 14.4 16.2 Vertical Lines 1 On 1 Off 8.5 12.7 21.8 24.6 Note: Input from signal generator: tr,tf < 2 ns. Theory of Operation The LM2426TE is a high voltage monolithic three channel CRT driver suitable for HDTV applications. The LM2426TE operates with 180V and 8V power supplies. The part is housed in the industry standard 11-lead TO-220 molded plastic power package with thin leads for improved metal-to- metal spacing. The circuit diagram of the LM2426TE is shown in Figure 2. The PNP emitter follower, Q5, provides input buffering. Q1 and Q2 form a fixed gain cascode amplifier with resistors R1 and R2 setting the gain at −53. Emitter followers Q3 and Q4 isolate the high output impedance of the cascode stage from the capacitance of the CRT cathode which decreases the sensitivity of the device to load capacitance. Q6 provides biasing to the output emitter follower stage to reduce cross- over distortion at low signal levels. Figure 3 shows a typical test circuit for evaluation of the LM2426TE. This circuit is designed to allow testing of the LM2426TE in a 50 Ω environment without the use of an expensive FET probe. In this test circuit, the two 4.99k Ω resistors form a 400:1 wideband, low capacitance probe when connected to a 50 Ω coaxial cable and a 50Ω load (such as a 50 Ω oscilloscope input). The input signal from the generator is ac coupled to the base of Q5. Application Hints INTRODUCTION National Semiconductor (NSC) is committed to provide ap- plication information that assists our customers in obtaining the best performance possible from our products. The fol- lowing information is provided in order to support this com- mitment. The reader should be aware that the optimization of performance was done using a specific printed circuit board designed at NSC. Variations in performance can be realized due to physical changes in the printed circuit board and the application. Therefore, the designer should know that com- ponent value changes may be required in order to optimize performance in a given application. The values shown in this document can be used as a starting point for evaluation purposes. When working with high bandwidth circuits, good layout practices are also critical to achieving maximum per- formance. IMPORTANT INFORMATION The LM2426TE performance is targeted for the HDTV mar- ket. The application circuits shown in this document to opti- mize performance and to protect against damage from CRT arcover are designed specifically for the LM2426TE. If an- other member of the LM242X family is used, please refer to its datasheet. www.national.com 6 |
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