TL497AC Datasheet, PDF (2/11 Pages) Texas Instruments – SWITCHING VOLTAGE REGULATORS

TL497AC, TL497AI, TL497AY
SWITCHING VOLTAGE REGULATORS
SLVS009C – JUNE 1976 – REVISED AUGUST 1995
description (continued)
Simplicity of design is a primary feature of the TL497AC and TL497AI. With only six external components (three
resistors, two capacitors, and one inductor), the TL497AC and TL497AI operates in numerous voltage
conversion applications (step-up, step-down, invert) with as much as 85% of the source power delivered to the
load. The TL497AC and TL497AI replace the TL497 in all applications.
The TL497AC is characterized for operation from 0°C to 70°C, and the TL497AI is characterized for operation
from – 40°C to 85°C.
functional block diagram
BASE† ¹¹
BASE DRIVE† ¹²
13
CUR LIM SENS
3
FREQ CONTROL
INHIBIT ²
COMP INPUT ¹
Current
Limit
Sense
Oscillator
10
COL OUT
4
SUBSTRATE
1.2-V
Reference
8
EMIT OUT
6
CATHODE
7 _ANODE
† _{BASE and BASE DRIVE are used for device testing only. They are not normally used in circuit applications of the device.}
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