MAX8541EEE datasheet(5/16 Pages) MAXIM

5 / 16 page

Synchronizable, High-Frequency Current- and

Voltage-Mode PWM Controllers for Isolated Supplies

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VVCC = 12V, CREF = 1µF, VUV = VOV = 2V, RFREQ/SYNC = 32.4k

Ω, CSS = 0.1µF, RMAXDTY = 97.6kΩ, VEN = 0, RSCOMP = 68kΩ,

RPRAMP = 25k

Ω, CSKTON = 0.01µF, CSKTOFF = 0.1µF, VOPTO = 2V, VILIM = 4V, VCS = 0.6V, CDRV = 10pF, TA = -40°C to +85°C,

unless otherwise noted.) (Note 5)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIL

1.2

Input Threshold

VIH

2.6

Pullup Current

V EN = 2.6V

µA

CURRENT LIMIT

VILIM Range

0.075

1.25

CS Current Limit to DRV Delay

Includes leading-edge blanking time

150

Accuracy when VILIM = 0.075V

±10

VCS Cycle-by-Cycle Threshold Voltage

VILIM = 1.250V

1.130

1.375

ILIM Leakage Current

-1

µA

Hiccup Skip Off-Charging Current

0.9

2.1

µA

Hiccup Skip On-Charging Current

1.5

3.5

µA

Hiccup SKTOFF Voltage Threshold

2.3

2.7

DUTY CYCLE

Duty-Cycle Range

VUV = 1.3V

Maximum Duty Cycle

Internal programmed max duty at all frequencies

SOFT-START

Source Current

VSS = 1V

4.5

6.5

µA

Pulldown Resistance in Shutdown

ISS = 10mA, V EN = 3V

Ω

FREQUENCY

Initial Accuracy

RFREQ = 32.4k

Ω

280

320

kHz

SYNC (EXTERNAL FREQUENCY SYNCHRONIZATION)

Frequency Range

Frequency syncs

±30% of frequency set by

external R on FREQ pin

0.2

1.0

M H z

FREQ Input Threshold

(Note 4)

Note 1: This is the VCC operating range after clearing the rising UVLO.

Note 2: Guaranteed by design.

Note 3: See the SKTON and SKTOFF section.

Note 4: The minimum FREQ pulse must be 200ns in duration with a minimum magnitude of 3V plus VF of the external diode and

have a maximum duty cycle of 55%.

Note 5: Specifications to -40°C are guaranteed by design and not production tested.

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