MAX5941BCSE datasheet(4/24 Pages) MAXIM

Part #	MAX5941BCSE

Description	IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices

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Manufacturer	MAXIM [Maxim Integrated Products]

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IEEE 802.3af-Compliant Power-Over-Ethernet

Interface/PWM Controller for Power Devices

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (PWM Controller) (continued)

(All voltages referenced to V-. VDD = 13V, a 10µF capacitor connects VCC to V-, VCS = V-, V+ = 48V, 0.1µF capacitor connected to

SS_SHDN, NDRV = open circuit, OPTO = V-, TA = TMIN to +TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

V+ Shutdown Current

VSS_SHDN = 0V, V+ = 67V

190

290

µA

VDD Shutdown Current

VSS_SHDN = 0V

8

20

µA

PREREGULATORS/STARTUP

V+ Input Voltage

18

67

V

VDD Supply Voltage

13

36

V

INTERNAL REGULATORS

Powered from V+, ICC = 7.5mA, VDD = 0V

7.5

9.8

12

VCC Output Voltage

Powered from VDD, ICC = 7.5mA

9.0

10.0

11.0

V

VCC Undervoltage Lockout

VCC_UVLO

VCC falling

6.6

V

OUTPUT DRIVER

Peak Source Current

VCC = 11V (externally forced)

570

mA

Peak Sink Current

VCC = 11V (externally forced)

1000

mA

NDRV High-Side Driver

Resistance

ROH

VCC = 11V, externally forced, NDRV

sourcing 50mA

412

Ω

NDRV Low-Side Driver

Resistance

ROL

VCC = 11V, externally forced, NDRV sinking

50mA

1.6

4

Ω

PWM COMPARATOR

OPTO Input Bias Current

VOPTO = VSS_SHDN

-1.00

+1.00

µA

OPTO Control Range

23

V

Slope Compensation

VSCOMP

MAX5941A

26

mV/µs

THERMAL SHUTDOWN

Thermal Shutdown Temperature

150

°C

Thermal Hysteresis

25

°C

CURRENT LIMIT

CS Threshold Voltage

VILIM

VOPTO = 4V

419

465

510

mV

CS Input Bias Current

0V

≤ VCS ≤ 2V, VOPTO = 4V

-1

+1

µA

Current-Limit Comparator

Propagation Delay

25mV overdrive on CS, VOPTO = 4V

180

ns

CS Blanking Time

VOPTO = 4V

70

ns

OSCILLATOR

Clock Frequency Range

VOPTO = 4V

235

275

314

kHz

MAX5941A, VOPTO = 4V

75

85

Max Duty Cycle

MAX5941B, VOPTO = 4V

44

50

%

SOFT-START

SS Source Current

ISSO

VSS(SHDN) = 0V

2.0

4.6

6.5

µA

SS Sink Current

1mA

Peak Soft-Start Voltage Clamp

No external load

2.331

2.420

2.500

V

VSS_SHDN falling (Note 11)

0.25

0.37

0.41

Shutdown Threshold

VSS_SHDN rising (Note 11)

0.53

0.59

0.65

V

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