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LTC4253/LTC4253A
31
425353aff
For more information www.linear.com/4253
APPLICATIONS INFORMATION
Power Limit Circuit Breaker
Figure 16 shows the LTC4253A in a power limit circuit
breaking application. The SENSE pin is modulated by board
voltage V
SUPPLY
. The D1 Zener voltage, V
Z
, is set to be the
same as the lowest operating voltage, V
SUPPLY(MIN)
??3V .
If the goal is to have the high supply operating voltage,
V
SUPPLY(MAX)
 = 71V give the same power as available at
V
SUPPLY(MIN)
, then resistors R3 and R4 are selected by:
 
R4
R3
=
V
CB
V
SUPPLY(MAX)
 
(16)
If R4 is 22? then R3 is 31.6k. The peak circuit breaker
power limit is:
POWER(MAX)=
V
SUPPLY(MIN)
+ V
SUPPLY(MAX)
(
)
2
4  V
SUPPLY(MIN)
V
SUPPLY(MAX)
POWER AT V
SUPPLY(MIN)
=1.064  POWER AT V
SUPPLY(MIN)
 
(17)
when V
SUPPLY
 = 0.5 " (V
SUPPLY(MIN)
 + V
SUPPLY(MAX)
)
 
= 57V
Figure 16. Power Limit Circuit Breaker Application
R6
5.6k
R5
5.6k
D1
BZV85C43
R7
5.6k
PWRGD1
V
IN
V
IN
V
EE
LTC4253A
POWER
MODULE 1
PWRGD2
PWRGD3
EN3
EN2
OV
UV
RESET
DRAIN
SS
GATE
SQTIMER
SENSE
TIMER
EN
POWER
MODULE 2
EN
POWER
MODULE 3
EN
R
IN
2.5k
15k(1/4W)/6
R3
31.6k
EN3
4253 F16
EN2
R
C
10
R
D
1M
R
S
0.02
Q1
IRF530S
V
IN
C
C
10nF
R4
22
C
T
0.68礔
C1
10nF
C
SQ
0.1礔
C
SS
33nF
R8
POWER
MODULE 1
OUTPUT
POWER
MODULE 2
OUTPUT
V
IN
R9
+
C3
0.1礔
C2
100礔
C
IN
1礔
R2
392k
1%
R1
30.1k
1%
 
 
 
 
 
RESET
(LONG PIN)
48V RTN
(SHORT PIN)
48V RTN
(LONG PIN)
48V
(LONG PIN)
D
IN
 
DDZ13B*
*DIODES, INC.
 
MOC207
 
RECOMMENDED FOR HARSH ENVIRONMENTS.
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