MAX13256 Datasheet, PDF (3/17 Pages) Maxim Integrated Products – 36V H-Bridge Transformer Driver for Isolated Supplies Integrated System Protection

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)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
ST1, ST2 Current Limit
I_LIM
R_LIM = 1000I
R_LIM = 3010I
500 650 800
165 215 265
ST1, ST2 Leakage Current
I_LKG
LOGIC SIGNALS (CLK, EN, FAULT)
V_EN = 3.3V, V_CLK = 0V,
V_ST1 = V_ST2 = 0V or V_DD
-1
+1
Input Logic-High Voltage
Input Logic-Low Voltage
Input Leakage Current
FAULT Output Logic-Low
Voltage
V_IH
V_IL
I_IL
V_CLK = V_EN = 5.5V or 0V
V_OL
I_FAULT = 10mA
2
0.8
-1
+1
1
FAULT Leakage Current
I_LKGF
V_FAULT = 36V, FAULT deasserted
10
AC CHARACTERISTICS
Switching Frequency
f_SW
V_CLK = 0V, measured at ST1/ST2 outputs
255
425
700
CLK Input Frequency
ST1/ST2 Duty Cycle
f_EXT
External clocking
D_TC
Internal or external clocking
200
2000
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
ST1/ST2 Fall Time
t_FALL
ST1/ST2 = 80% to 20% of V_DD, R_L = 1kI,
C_L = 50pF, Figure 1a
100
Crossover Dead Time
Watchdog Timeout
Current-Limit Blanking Time
Current-Limit Autoretry Time
PROTECTION
t_DEAD
t_WDOG
t_BLANK
t_RETRY
R_L = 200I, Figure 1b
Figure 2
Figure 2
30
20
32
55
0.73 1.2
2.0
23.4 38.4 64.0
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
T_SHDN
T_{SHDN_HYS}
+160
10
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.
UNITS
mA
FA
V
V
FA
V
FA
kHz
kHz
%
ns
ns
ns
Fs
ms
ms
NC
NC
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