Typical Application - Hyundai ImageQuest L70A Technical & Service Manual

L70A Technical Service Manual
LM-2596
MC68HC705BD7B
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 avail-
able in fixed outputvoltages of 3.3V, 5V, 12V, and an adjust-
able 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 switchingregu-
lators. 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 dif-
ferent manufacturers optimizedfor use withthe LM2596 se-
ries.This feature greatly simplifies the design of
switch-mode power supplies.
Other features include a guaranteed
put voltage under specified input voltage and output load
conditions, and +/- 15% on the oscillator frequency. External
shutdown is included, featuring typically80 A standby cur-
rent. Self protection features include a two stage frequency
reducing current limitfor the outputswitch and an over tem-
perature shutdownfor complete protection under faultcondi-
tions.

Typical Application

4% tolerance on out-
+/-
(Fixed Output Voltage Versions)
--25--
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, I
- 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.
typically80 A
Q