LM1292

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Supply Voltage .........................................14V
Input Voltage, VDC
Pin 14..........................................................5V
Pin 24..................................1.3V < VIN < 7.2V
Pins 5, 6......................................................8V
Pins 8, 28..................................................10V
Pins 2, 9, 12, 13, 15, 18............................V_CC
Power Dissipation (PD) ..........................2.5W
(Above 25°C, derate based on qJA and TJ)
Thermal Resistance (JA) .................50°C/W
Junction Temperature (TJ) ..................150°C
ESD Susceptibility (Note 5)..................... 2 kV
Storage Temperature ........−65°C to +80°C
Lead Temperature
(Soldering 10 sec.)............................. 265°C

The LM1292 is a very low jitter, integrated horizontal time base solution specifically designed to operate in high performance, continuous-sync video monitors. It automatically synchronizes to any H frequency from 22 kHz to 125 kHz and provides the drive pulse to the high power deflection circuit. Available sync processing includes a vertical sync separator and a composite video sync stripper. An internal sync selection scheme gives highest priority to separate H and V sync, then composite sync, and finally sync on video; no external switching between sync sources is necessary. The LM1292 provides polarity-normalized H/HV and V sync outputs.

The LM1292 design uses an on-chip FVC (Frequency-to-Voltage Converter) to set the center frequency of the VCO (Voltage-Controlled Oscillator). This technique allows autosync operation over the entire frequency range using just one optimized set of external components. The system includes a second phase detector which compensates for storage time variation in the horizontal output transistor; the picture's horizontal position is thus independent of temperature and component variance.

The LM1292 provides DC control pins for H Drive duty cycle and flyback phase.