Document
LM2422 220V Monolithic Triple Channel 30 MHz CRT DTV Driver
January 2005
LM2422 220V Monolithic Triple Channel 30 MHz CRT DTV Driver
General Description
The LM2422 is a triple channel high voltage CRT driver circuit designed for use in DTV applications. The IC contains three high input impedance, wide band amplifiers which directly drive the RGB cathodes of a CRT. Each channel has its gain internally set to −52 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 an industry standard 11-lead TO-220 molded plastic power package designed specifically to meet high voltage spacing requirements. See Thermal Considerations section.
Features
30 MHz bandwidth Greater than 130VP-P output swing capability 0V to 5V input voltage range Stable with 0 pF–20 pF capacitive loads and inductive peaking networks n Convenient TO-220 staggered thin lead package style n n n n
Applications
n HDTV applications using the 1080i format as well as other DTV and standard TV formats.
Connection Diagram
Schematic Diagram
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FIGURE 1. Top View Order Number LM2422 See NS Package Number TE11B FIGURE 2. Simplified Schematic Diagram (One Channel)
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© 2005 National Semiconductor Corporation
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www.national.com
LM2422
Absolute Maximum Ratings
3)
(Notes 1,
Operating Ratings (Note 2)
VCC VBB VIN VOUT Case Temperature (22W max power) +100V to +230V +7V to +13V +0V to +5V +40V to +215V 110˚C
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) Bias Voltage (VBB) Input Voltage (VIN) Storage Temperature Range (TSTG) Lead Temperature (Soldering, < 10 sec.) ESD Tolerance, Human Body Model Machine Model Junction Temperature θJC (typ) 2 kV 200V 150˚C 1.8˚C/W 300˚C +250V +16V −0.5V to VBB +0.5V −65˚C to +150˚C
Do not operate the part without a heat sink. Heat sink must have a thermal resistance under 2.3˚C/W. (Note 7)
Electrical Characteristics
(See Figure 3 for Test Circuit). Unless otherwise noted: VCC = +220V, VBB = +12V, CL = 10 pF, TC = 60˚C. DC Tests: VIN = +2.7VDC. AC Tests: Output = 110VPP (80V – 190V) at 1 MHz. Symbol ICC IBB VOUT, 1 VOUT, 2 AV ∆AV LE tr +OS tf −OS Parameter Supply Current Bias Current DC Output Voltage DC Output Voltage DC Voltage Gain Gain Matching Linearity Error Rise Time, 60V to 190V Overshoot Fall Time, 60V to 190V Overshoot (Note 6), 90% to 10% (Note 6) No AC Input Signal, VIN = 2.7VDC No AC Input Signal, VIN = 1.2VDC No AC Input Signal (Note 4), No AC Input Signal (Notes 4, 5), No AC Input Signal (Note 6), 10% to 90% Conditions No Input Signal, No Video Input, No Output Load LM2422 Min 36 18 124 200 −49 Typ 45 27 129 205 −52 1.0 8 12 12 12 4 Max 54 36 134 210 −55 Units mA mA VDC VDC V/V dB % ns % ns %
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may o.