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I found the manual to be clear concise and complete. It was of immense assistance when removing the unit as the unit was over 22 years old and the wiring diagram was unobtainable from the manufacturer. The exploded drawings were clear as were the instructions and labels.
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L70A Technical Service Manual
MC68HC705BD7B LM-2596
SIMPLE SWITCHER Power Converter 150kHz 3A Step-Down Voltage Regulator
General Description
The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switchingregulator capable of drivinga 3A load with , excellent line and load regulation. These devices are available in fixed outputvoltages of 3.3V, 5V, 12V, and an adjustable output version. Requiring a minimumnumber of external components, these regulators are simple to use and include internal frequency compensation �, and a fixed-frequency oscillator. The LM2596 series operates at a switching frequency of 150 kHz thus allowingsmaller sized filter components than what wouldbe needed withlower frequency switchingregulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. A standard series of inductors are available from several different manufacturers optimizedfor use withthe LM2596 series.This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed+/-4% tolerance on output voltage under specified input voltage and output load conditions, and +/- 15% on the oscillator frequency. External shutdown is included, featuring typically80 A standby current. Self protection features include a two stage frequency reducing current limitfor the outputswitch and an over temperature shutdownfor complete protection under faultconditions.
Features
- 3.3V, 5V, 12V, and adjustable output versions - Adjustable version output voltage range, 1.2V to 37V 4% max over line and load conditions - Available in TO-220 and TO-263 packages - Guaranteed 3A output load current - Input voltage range up to 40V - Requires only 4 external components - Excellent line and load regulation specifications - 150 kHz fixed frequency internal oscillator - TTL shutdown capability - Low power standby mode, Q I typically80A - High efficiency - Uses readily available standard inductors - Thermal shutdown and current limitprotection
Applications
- Simple high-efficiency step-down (buck) regulator - On-card switching regulators - Positive to negative converter
Note: �Patent Number 5,382,918.
Typical Application
(Fixed Output Voltage Versions)
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