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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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