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UC17132 Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte UC17132
Spiegazioni elettronici  Smart Power Switch
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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UC17132 Scheda tecnica(HTML) 7 Page - Texas Instruments

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UC17131/2/3
UC27131/2/3
UC37131/2/3
Choosing The CDEL Capacitor
The maximum amount of time that VCC power can be in-
terrupted and not require the outputs to go through a
turn-on delay cycle is user programmable by the CDEL
capacitor value. While VCC is interrupted, the outputs
will be in an indeterminate state and they may turn off
during this interval, tINT. However, as long as the pro-
grammed interruption time is not exceeded, the outputs
will immediately turn back on with the return of VCC.
For example:
ts
INT ≈ 500µ
(User specified)
CDEL is selected such that the time it takes for this ca-
pacitor to discharge from VCDEL_MAX (5.8V) to VFAULT_L
(1.3V) with a discharge current of 94
µA is just greater
than this tINT. This time is referred to as tD(OFF) in Fig.
3b.
()
CDEL
It
VV
DISCHARGE
D OFF
CDEL MAX
FAULT L
=
__
If tD(OFF) is set equal to tINT, which the user has selected
to be 500
µs, the minimum CDEL capacitor is calculated:
CDEL
As
VV
=
94
500
58
13
µµ
..
For this application, the CDEL capacitor value calculates
to 10.4nF. By using a 10nF capacitor on CDEL, VCC can
be interrupted for up to 478
µs and the outputs will experi-
ence an indeterminate state during this interruption, but
resume normal operation when VCC power returns to
normal.
If the VCC power is interrupted for a time equal to or lon-
ger than tD(OFF) then the following relationships apply.
As the CDEL capacitor discharges past the VFAULT_L
threshold, the output is fully disabled and must cycle
through a power up delay equal to tD(ON). The charge
current for the CDEL capacitor is equal to 4
µA. The out-
puts will turn on when the CDEL capacitor charges up to
the VFAULT_H threshold of 4.9V. The minimum turn-on
delay the outputs will experience will occur if tINT is ex-
actly equal to the tD(OFF) time and the CDEL capacitor
has only discharged to VFAULT_L. This would be the mini-
mum turn-on delay time and is calculated with the follow-
ing equation:
()
t
CDEL
V
V
I
DON
FAULT L
FAULT H
CHARGE
min
__
=
•−
Using the 10nF CDEL capacitor, for example, the mini-
mum turn-on delay calculates to 9ms. If the CDEL ca-
pacitor discharges completely to zero, then the 10nF
CDEL capacitor would cause a turn-on delay of 12.25ms.
The outputs would be off for this amount of time after
VCC power is restored. The total amount of time the out-
puts could be disabled is equal to the tINT time, which
may include the indeterminate time of tD(OFF), and the
tD(ON) time, as shown in Fig. 3b.
APPLICATION INFORMATION
C
CDEL
13
12
11
VREF
IN
6
10
3
7
VCC
LS
CSH
2
GND
6V
PRE-REGULATOR
INPUT
COMPARATOR
1/2
VREF
HYST
9
LED
TURN-ON/OFF
AND SHORT
CIRCUIT
PROTECTION
CDEL
4
HS
5
Q
OUT
VREF
GND
72V
R
CSH
–L
CSL
+L
OUT
C
CC
LOAD
I
GND
R
HYST
POWER
SUPPLY
C
REF
I
CC
Figure 2a. High side application.
UDG-98027


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