MAX8540-MAX8541 datasheet(3/16 Pages) MAXIM

Part #	MAX8540-MAX8541

Description	Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies

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Manufacturer	MAXIM [Maxim Integrated Products]

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Synchronizable, High-Frequency Current- and

Voltage-Mode PWM Controllers for Isolated Supplies

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

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

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

RSCOMP = 68k

Ω, RPRAMP = 25kΩ, CSKTON = 0.01µF, CSKTOFF = 0.1µF, VCS = 0.6V, CDRV = 10pF, TA = 0°C to +85°C, unless otherwise

noted. Typical values are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ILIM Leakage Current

-1

+1

µA

Hiccup Skip Off-Time

CSKTOFF = 0.1µF (Note 3)

90

ms

Hiccup Skip Off-Charging

0.9

1.5

2.1

µA

Hiccup Skip On-Time

CSKTON = 0.01µF (Note 3)

9

ms

Hiccup Skip On-Charging

Current

1.5

2.5

3.5

µA

Hiccup SKTOFF Voltage

Threshold

2.3

2.5

2.7

V

OPTO

Input Bias Current

VOPTO = 3.5V

30

µA

Minimum Input Voltage

Minimum voltage for duty-cycle control

0.6

V

Maximum Input Voltage

Maximum voltage for duty-cycle control

2.6

V

DUTY CYCLE

RMAXDTY = 24.3k

Ω, VUV = 1.3V

15

RMAXDTY = 130k

Ω, VUV = 1.3V

80

VUV = 1.3V, RMAXDTY = 97.6k

Ω

60

Maximum Duty Cycle

Internally programmed limit for maximum duty cycle at

all frequencies

79

80

82

%

SOFT-START

Source Current

VSS = 1V

4.5

5.5

6.5

µA

Pulldown Resistance in Shutdown ISS = 10mA, V EN = 3V

10

30

Ω

Time

440

ms/µF

FREQUENCY

Initial Accuracy

RFREQ = 32.4k

Ω

280

300

320

kHz

RFREQ = 48.7k

Ω

200

Switching Frequency Range

RFREQ = 8.87k

Ω

1000

kHz

SCOMP (MAX8540)

RSCOMP = 14k

Ω

1.5

Slope Compensation

RSCOMP = 204k

Ω

0.1

V

PRAMP (MAX8541)

RPRAMP = 12.4k

Ω

2.5

RPRAMP = 21k

Ω

1

Ramp Voltage Amplitude

RPRAMP = 42k

Ω

0.5

V

DRV (MOSFET DRIVER)

CDRV = 500pF, 10% to 90% of VVCC

30

Rise Time

CDRV = 2000pF, 10% to 90% of VVCC

57

ns

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