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TFT TV Service Manual 11/04/2006
11.13.4. Connection
Diagrams
11.14. LM317
11.14.1. General
Description
This monolithic integrated circuit is an adjustable 3-terminal positive voltage regulator designed to
supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V. It employs
internal current limiting, thermal shut-down and safe area compensation.
11.14.2. Features
• Output Current In Excess of 1.5A
• Output Adjustable Between 1.2V and 37V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe Operating Area Compensation
• TO-220 Package
11.14.3. Pin
Description
11.15. LM809
11.15.1. General
Description
The LM809/810 microprocessor supervisory circuits can be used to monitor the power supplies in
microprocessor and digital systems. They provide a reset to the microprocessor during power-up,
power-down and brown-out conditions. The function of the LM809/810 is to monitor the VCC supply
voltage, and assert a reset signal whenever this voltage declines below the factory-programmed reset
threshold. The reset signal remains asserted for 240 ms after VCC rises above the threshold. The
LM809 has an active-low RESET output, while the LM810 has an active-high RESET output. Seven
standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages.
With a low supply current of only 15µA, the LM809/810 are ideal for use in portable equipment.
11.15.2. Features
• Precise monitoring of 3V, 3.3V, and 5V supply voltages
• Superior upgrade to MAX809/810
• Fully specified overtemperature
• 140 ms min. Power-On Reset pulse width, 240 ms typical
Active-low RESET Output(LM809)
Active-high RESET Output(LM810)
