MAX13256 datasheet(3/17 Pages) MAXIM

Part #	MAX13256

Description	36V H-Bridge Transformer Driver for Isolated Supplies Integrated System Protection

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Manufacturer	MAXIM [Maxim Integrated Products]

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�� Maxim Integrated Products 3

MAX13256

36V H-Bridge Transformer

Driver for Isolated Supplies

ELECTRICAL CHARACTERISTICS (continued)

(VDD = 8V to 36V, VEN = 0V, TA = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)

Note 2: All units are production tested at TA = +25NC. Specifications over temperature are guaranteed by design.

Note 3: If VDD is greater than 27V, see the Snubber section.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ST1, ST2 Current Limit

ILIM

RLIM = 1000I

500

650

800

mA

RLIM = 3010I

165

215

265

ST1, ST2 Leakage Current

ILKG

VEN = 3.3V, VCLK = 0V,

VST1 = VST2 = 0V or VDD

-1

+1

F

A

LOGIC SIGNALS (CLK, EN, FAULT)

Input Logic-High Voltage

VIH

2

V

Input Logic-Low Voltage

VIL

0.8

V

Input Leakage Current

IIL

VCLK = VEN = 5.5V or 0V

-1

+1

F

A

FAULT Output Logic-Low

Voltage

VOL

IFAULT = 10mA

1

V

FAULT Leakage Current

ILKGF

VFAULT = 36V, FAULT deasserted

10

F

A

AC CHARACTERISTICS

Switching Frequency

fSW

VCLK = 0V, measured at ST1/ST2 outputs

255

425

700

kHz

CLK Input Frequency

fEXT

External clocking

200

2000

kHz

ST1/ST2 Duty Cycle

DTC

Internal or external clocking

49

50

51

%

ST1/ST2 Rise Time

tRISE

ST1/ ST2 = 20% to 80% of VDD, RL = 1kI,

CL = 50pF, Figure 1a

100

ns

ST1/ST2 Fall Time

tFALL

ST1/ST2 = 80% to 20% of VDD, RL = 1kI,

CL = 50pF, Figure 1a

100

ns

Crossover Dead Time

tDEAD

RL = 200I, Figure 1b

30

ns

Watchdog Timeout

tWDOG

20

32

55

F

s

Current-Limit Blanking Time

tBLANK

Figure 2

0.73

1.2

2.0

ms

Current-Limit Autoretry Time

tRETRY

Figure 2

23.4

38.4

64.0

ms

PROTECTION

Thermal-Shutdown Threshold

TSHDN

+160

N

C

Thermal-Shutdown Hysteresis

TSHDN_HYS

10

N

C

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