lm2433 National Semiconductor Corporation, lm2433 Datasheet

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lm2433

Manufacturer Part Number
lm2433
Description
220v Monolithic Single Channel 16 Mhz Edtv Crt Driver
Manufacturer
National Semiconductor Corporation
Datasheet
© 2005 National Semiconductor Corporation
LM2433
220V Monolithic Single Channel 16 MHz EDTV CRT
Driver
General Description
The LM2433 is a single channel high voltage CRT driver
circuit designed for use in Rear-Projection and Direct-View
EDTV applications. The IC contains a high input impedance,
wide band amplifier which can be DC coupled to a cathode
of a CRT. The amplifier has its gain internally set to −53 and
can drive CRT capacitive loads as well as resistive loads
present in other applications, limited only by the package’s
power dissipation.
The IC is packaged in a staggered 7-lead TO-220 molded
plastic power package designed specifically to meet high
voltage spacing requirements. See the section “Power Dis-
sipation and Heatsink Calculation” for more information.
Pinout Diagram
Note: Tab is at GND.
FIGURE 1. Simplified Connection and Pinout Diagram
Order Number LM2433TE
Top View
DS201462
20146202
Features
n 16 MHz bandwith at 110V
n 0V to 4V input range
n Greater than 110V
n IK Current Output (pin 5) for IK feedback systems
n Emitter (pin 6) access to increase voltage gain
Applications
n For Rear-Projection and Direct-View DC coupled CRT
n Compatible with RGB video processors with IK feedback
Schematic Diagram
applications using EDTV formats
for automatic cathode calibration
FIGURE 2. Simplified Schematic Diagram
PP
output swing capability
PP
output swing
November 2005
www.national.com
20146201

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lm2433 Summary of contents

Page 1

... Monolithic Single Channel 16 MHz EDTV CRT Driver General Description The LM2433 is a single channel high voltage CRT driver circuit designed for use in Rear-Projection and Direct-View EDTV applications. The IC contains a high input impedance, wide band amplifier which can be DC coupled to a cathode of a CRT. The amplifier has its gain internally set to − ...

Page 2

... Note 3: All voltages are measured with respect to GND, unless otherwise specified. Note 4: Linearity Error is the variation in DC gain from V < Note 5: Input from signal generator ns. Slower inputs to the LM2433 will change the transient response and reduce power dissipation Note – ...

Page 3

... Figure 3 shows a typical test circuit for evaluation of the LM2433. This circuit was designed to test the transient response of the LM2433 in a 50Ω environment without the use of an expensive FET probe. On the input side, a 50Ω pulse generator output can be AC coupled and biased with an external supply via the V divider with the 50Ω ...

Page 4

... Typical Performance Characteristics − 190V), pin 6 floating, Test Circuit - Figure 3 , unless otherwise specified) FIGURE OUT FIGURE 5. LM2433 Pulse Response FIGURE 6. Bandwidth www.national.com (V = +220V 20146227 IN 20146223 FIGURE 8. Speed vs Case Temperature 20146220 4 = +12V pF 110V BB L OUT PP 20146208 FIGURE 7. Speed vs Offset ...

Page 5

Typical Performance Characteristics − 190V), pin 6 floating, Test Circuit - Figure 3, unless otherwise specified) (Continued +220V FIGURE 9. Power Dissipation vs Frequency 20146221 FIGURE 10. Power Derating Curve FIGURE 11. Cathode Pulse Response 5 ...

Page 6

... The part is housed in a staggered 7-lead TO-220 molded plastic power package. The circuit diagram of the LM2433 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 − ...

Page 7

... TV applications. The band- width of the input source used to drive the LM2433 was over 300 MHz. Using a RGB video processor or preamplifier with less bandwidth will cause the LM2433 to dissipate less power than shown in Figure 9 at the same conditions ...

Page 8

... RGB processor data sheet or contact your local National Semiconductor Sales Office with your specific application requirements. Feedback Topologies RGB processors that use voltage feedback require the LM2433 IK current to be converted to voltage via a resistor ( ground. This IK voltage will be fed back to the IK IK ...

Page 9

... RGB proces- PROT sor input and LM2433 IK output in this case. Again, it may be necessary for the RGB processor to have IK leakage com- pensation for the leakage current attributed to the zener. See a simplified current feedback interface circuit in Figure 14. ...

Page 10

... RGB processor. Video Output and Arc Protection The routing of the LM2433 output to the CRT is very critical to achieve optimal video performance and robustness against arcover. Figure 16 shows the routing and component ...

Page 11

11 www.national.com ...

Page 12

... Application Hints (Continued) www.national.com FIGURE 16. LM2433 Demonstration Board Layout (slightly enlarged for more detail) 12 20146213 ...

Page 13

... English www.national.com Français Tel: +33 ( 8790 NS Package Number TE07A Order Number LM2433TE 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. ...

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