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LM2432 Folha de dados(PDF) 6 Page - Texas Instruments

Nome de Peças LM2432
Descrição Electrónicos  Monolithic Single Channel 37 MHz HDTV CRT Driver
Download  17 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM2432 Folha de dados(HTML) 6 Page - Texas Instruments

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OBSOLETE
LM2432
SNOSAL4E – MARCH 2005 – REVISED APRIL 2013
www.ti.com
THEORY OF OPERATION
The LM2432 is a high voltage monolithic single channel CRT driver suitable for HDTV applications. The LM2432
typically operates with 220V and 12V power supplies. The part is housed in a staggered 7-lead TO-220 molded
plastic power package.
The circuit diagram of the LM2432 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 crossover distortion at low signal levels.
The LM2432 has an IK current output (pin 5) that produces a replica of the actual cathode current into VOUT (pin
2). The IK output pin is internally connected to the collector of Q4. If IK feedback is not used in the application,
the IK pin should be connected to the same ground as pin 3 (GND). Otherwise, the IK output can interface with a
RGB video processor with IK feedback for automatic cathode calibration.
NOTE
During the non-blanking period, video current levels can be as high as several mA, which
is much higher than the reference currents (in µA range) produced during the IK
measurement interval. These high currents have the potential to produce large voltages at
the IK output pin. To avoid damage to Q4, the IK output voltage, VIK, must not exceed
+16V (VIKMAX) . Please see the section “CATHODE CURRENT OUTPUT FOR IK
FEEDBACK SYSTEMS” for more information on the usage and protection of the IK output.
6
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LM2432


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