Rainbow-electronics MAX1641 Manual do Utilizador descarregar pdf (Página 3)

MAX1640/MAX1641

Adjustable-Output, Switch-Mode

Current Source with Synchronous Rectifier

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ELECTRICAL CHARACTERISTICS

= +12V, V

OUT

= 6V, Circuit of Figure 2, T

= -40°C to +85°C, unless otherwise noted.)

REF

= 0 to 50µA

OUT

= 2V to 24V (MAX1640)

D0 = D1 = low

D0 or D1 = high

FET Drive Output Resistance

MAX1641

MAX1640

= 5.5V to 26V,

LOAD

= 0 to 20mA

= 5.5V to 26V,

LOAD

= 0 to 20mA

MAX1640

CONDITIONS

µA1V

SET

Input Current

mV10Reference Load Regulation

V1.94 2.06V

REF

Reference Voltage

V4.0 4.4V

LDOL

Undervoltage Lockout

µA1Output Current in Off Mode

mA4Quiescent V

Supply Current

%/V0.4Output Current Compliance

34 48

Quarter-Scale Current-Sense

Threshold

12 Ω

Off-Time Range

V5.5 26V

Input Voltage Range

1.5 8 µs

Off-Time Accuracy R

TOFF

= 62kΩ 1.5 2.5 µs

146 154

Pulse-Trickle Mode Duty-Cycle

Period

141 159

Full-Scale Current-Sense

Threshold

- V

5.5 4.5

LDOH

Linear-Regulator Output

Voltage, V

Referenced

D0 = low, D1 = high, R

TOFF

= 50kΩ 25 42 ms

V4.5 5.5V

LDOL

Linear-Regulator Output

Voltage, Ground Referenced

UNITSMIN TYP MAXSYMBOLPARAMETER

PWM Maximum Duty Cycle 100 %

Input Low Voltage V

D0, D1 0.8 V

Input High Voltage V

D0, D1 2.4 V

Input Leakage Current I

D0, D1 ±1 µA

33 42MAX1641

ELECTRICAL CHARACTERISTICS (continued)

= +12V, V

OUT

= 6V, Circuit of Figure 2, T

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

= +25°C.)

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

PWM Maximum Duty Cycle 100 %

Input Low Voltage V

D0, D1 0.8 V

Input High Voltage V

D0, D1 2.4 V

Input Leakage Current I

D0, D1 ±1 µA

1 2 3 4 5 6 7 8 9 10 11

MAX1640/MAX1641 1

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