Rainbow-electronics MAX13256 Uživatelský manuál Strana 3

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MAX13256
36V H-Bridge Transformer
Driver for Isolated Supplies
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 8V to 36V, V
EN
= 0V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 2)
Note 2: All units are production tested at T
A
= +25NC. Specifications over temperature are guaranteed by design.
Note 3: If V
DD
is greater than 27V, see the Snubber section.
Note 4: See the Watchdog section.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ST1, ST2 Current Limit I
LIM
R
LIM
= 1000I
500 650 800
mA
R
LIM
= 3010I
165 215 265
ST1, ST2 Leakage Current I
LKG
V
EN
= 3.3V, V
CLK
= 0V,
V
ST1
= V
ST2
= 0V or V
DD
-1 +1
FA
LOGIC SIGNALS (CLK, EN, FAULT)
Input Logic-High Voltage V
IH
2 V
Input Logic-Low Voltage V
IL
0.8 V
Input Leakage Current I
IL
V
CLK
= V
EN
= 5.5V or 0V
-1 +1
FA
FAULT Output Logic-Low
Voltage
V
OL
I
FAULT
= 10mA
1 V
FAULT Leakage Current
I
LKGF
V
FAULT
= 36V, FAULT deasserted
10
FA
AC CHARACTERISTICS
Switching Frequency f
SW
V
CLK
= 0V, measured at ST1/ST2 outputs 255 425 700 kHz
CLK Input Frequency f
EXT
External clocking 200 2000 kHz
ST1/ST2 Duty Cycle D
TC
Internal or external clocking 49 50 51 %
ST1/ST2 Rise Time t
RISE
ST1/ ST2 = 20% to 80% of V
DD
, R
L
= 1kI,
C
L
= 50pF, Figure 1a
100 ns
ST1/ST2 Fall Time t
FALL
ST1/ST2 = 80% to 20% of V
DD
, R
L
= 1kI,
C
L
= 50pF, Figure 1a
100 ns
Crossover Dead Time t
DEAD
R
L
= 200I, Figure 1b
30 ns
Watchdog Timeout t
WDOG
(Note 4) 20 32 55
Fs
Current-Limit Blanking Time t
BLANK
Figure 2 0.73 1.2 2.0 ms
Current-Limit Autoretry Time t
RETRY
Figure 2 23.4 38.4 64.0 ms
PROTECTION
Thermal-Shutdown Threshold T
SHDN
+160
NC
Thermal-Shutdown Hysteresis T
SHDN_HYS
10
NC
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