Electrical characteristics (continued) – Rainbow Electronics MAX13256 User Manual
Page 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
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
F
A
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
F
A
FAULT Output Logic-Low
Voltage
V
OL
I
FAULT
= 10mA
1
V
FAULT Leakage Current
I
LKGF
V
FAULT
= 36V, FAULT deasserted
10
F
A
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
F
s
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
N
C
Thermal-Shutdown Hysteresis
T
SHDN_HYS
10
N
C