Rainbow-electronics MAX8514 Manual do Utilizador descarregar pdf (Página 4)

MAX8513/MAX8514

Wide-Input, High-Frequency, Triple-Output Supplies

with Voltage Monitor and Power-On Reset

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= V

SUP2

= 12V, V

PVL

= V

BST

- V

= V

DRV3P

= 5V, V

SUP3N

= 3.3V, V

DRV3N

= -5V, C

= 4.7µF, C

REF

= 0.22µF, R

FREQ

15.0kΩ, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

OUT3N (NEGATIVE NPN LDO CONTROLLER) (MAX8514 ONLY)

SUP3N Operating Range (Note 1) 1.5 5.5 V

DRV3N Operating Range (Note 1)

SUP3N

- 21V

SUP3N

- 1.5V

SUP3N Supply Current

DRV3N

= 1.5V, V

SUP3N

= 3.5V,

DRV3N

= -1mA (source)

1.1 2 mA

FB3N Regulation Voltage

DRV3N

= 1.5V, V

SUP3N

= 3.5V,

DRV3N

= -1mA (source)

-20 -5 +10 mV

FB3N to DRV3N Large-Signal

Transconductance

C3N

DRV3N

= 0, I

DRV3N

= -0.5mA to -5mA

(source)

0.225 0.36 0.550 S

Feedback Input Bias Current V

FB3N

= -100mV 60 1000 nA

Driver Source Current

FB3N

= 200mV, V

DRV3N

= 0,

SUP3N

= 3.5V

13 25 mA

FB3N POR Threshold 450 500 550 mV

FB3N Soft-Start Period 2048

Clock

Cycles

REFERENCE

REF Output Voltage V

REF

-2µA < I

REF

< +50µA 1.231 1.25 1.269 V

OSCILLATOR

FREQ

= 10.7kΩ ±1% from FREQ to GND 1300 1390 1460

FREQ

= 15.0kΩ ±1% from FREQ to GND 933 985 1040Frequency f

FREQ

= 50.0kΩ ±1% from FREQ to GND 260 290 324

kHz

FREQ Resistance-Frequency

Product

15.0

MHz

× kΩ

FREQ

= 10.7kΩ ±1% from FREQ to GND 77 83 91

FREQ

= 15.0kΩ ±1% from FREQ to GND 80 87 95

Maximum Duty Cycle

(Measured at DH Pin)

FREQ

= 50.0kΩ ±1% from FREQ to GND 93 96 99

Minimum On-Time

(Measured at DH Pin)

FREQ

= 10.7kΩ ±1% from FREQ to GND 20 62 ns

SYNC/EN Pulse Width Low or high (Note 1) 200 ns

SYNC/EN Frequency Range

SYNC/EN input frequency needs to be

within ±30% of the value set at the FREQ

pin (Note 1)

200 1850 kHz

SYNC/EN Input Voltage, High 2.4 V

SYNC/EN Input Voltage, Low 0.8 V

SYNC/EN Input Current V

SYNC/EN

= 0 to 5.5V -1 +1 µA

1 2 3 4 5 6 7 8 9 ... 34 35

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