LT1036_15 Datasheet, PDF (7/12 Pages) Linear Technology – Logic Controlled Regulator

LT1036
APPLICATIO S I FOR ATIO
Output Current
The main output current limits at about 4A for input
voltages below 20V. Internal foldback, or “power limit-
ing”, circuitry detects the input-output voltage differential
and reduces current limit for input to output voltages
exceeding 8V. With 25V input, for instance, short circuit
current is reduced to ≈ 0.9A.
An additional feature of the LT1036 is that the auxiliary
supply does not incorporate, nor is it affected by, thermal
shutdown. Any fault condition of the main regulator will
not affect the auxiliary output voltage.
The following applications circuits will serve to indicate
the versatility of the LT1036.
TYPICAL APPLICATIO S
Fast Turn-Off, Delayed Turn-On
V_IN
IN
OUT
12V
LT1036
*
EN _GND AUX
*CAN BE ANY GATE TYPE
+
R1
C1
100k
t_ON = 0.3 R1C1
LT1036M/1036C • TA01
Delayed Power-Up
V_IN
IN
OUT
12V
LT1036
EN _GND AUX
5V
Latch-Off with Output Short
V_IN
IN
OUT
LT1036
12V
68k
EN _GND AUX
0.33µF
5V
LT1036M/1036C • TA02
Thermal Cutoff at High Ambient Temperature
V_IN
IN
OUT
5V
LT1036
EN _GND AUX
26.1k
154k
C1
R1
27k
t_DELAY ≈ 0.4 R1C1
t_OFF = 58°C
t_ON = 46°C
R_t*
LT1036M/1036C • TA03
*YELLOW SPRINGS #44008. 30kΩ at 25°C
LT1036M/1036C • TA04
Power Supply Turn-On Sequencing
V_IN
IN
OUT
LT1036
EN _GND AUX
R1
C1
t₁ = 0.4 R1C1
R2
C2
IN
OUT
LT1036
EN _GND AUX
t₂ = 0.15 R2C2
LT1036M/1036C • TA05
1036fb
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