MAX5019ESA datasheet(3/14 Pages) MAXIM

3 / 14 page

Current-Mode PWM Controllers with Integrated

Startup Circuit

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD = 13V, a 10µF capacitor connects VCC to GND, VCS = 0, V+ = 48V, 0.1µF capacitor connected from SS_SHDN to GND, NDRV

= open circuit, VFB = 3V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SLOPE COMPENSATION

Slope Compensation

(MAX5019 only)

VSCOMP

mV/

µs

THERMAL SHUTDOWN

Thermal Shutdown Temperature

150

°C

Thermal Hysteresis

°C

CURRENT LIMIT

CS Threshold Voltage

VILIM

FB = GND

419

465

510

CS Input Bias Current

≤ VCS ≤ 2V, FB = GND

-1

µA

Current Limit Comparator

Propagation Delay

50mV overdrive on CS, FB = GND

180

CS Blanking Time

FB = GND, only PWM comparator is blanked

OSCILLATOR

Clock Frequency Range

FB = GND

247

275

302

kHz

MAX5019, FB = GND

Max Duty Cycle

MAX5020, FB = GND

SOFT-START

SS Source Current

ISSO

VSS_SHDN = 0

2.0

4.5

6.5

µA

SS Sink Current

1.0

Steady State Reference Voltage

at SS_

SHDN

VSS_SHDN

No external load

2.331

2.420

2.500

VSS_SHDN falling

0.25

0.37

0.41

Shutdown Threshold

VSS_SHDN rising

0.53

0.59

0.65

Typical Operating Characteristics

(V+ = 48V, VDD = 13V, CS = GND, NRDV is open circuit, TA = +25°C, unless otherwise noted.)

0.999

1.000

1.001

1.002

1.003

-40

-20

VSS_SHDN vs. TEMPERATURE

(AT THE END OF SOFT-START)

TEMPERATURE (

°C)

VFB = 4V

273

274

276

275

277

278

-40

-20

NDRV FREQUENCY

vs. TEMPERATURE

TEMPERATURE (

°C)

FB = GND

80.4

80.6

80.5

80.8

80.7

80.9

81.0

-40

-20

MAX5019

MAXIMUM DUTY CYCLE

vs. TEMPERATURE

TEMPERATURE (

°C)

FB = GND

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