Rainbow-electronics MAX5051 Manual de usuario descargar pdf (Pagina 3)

MAX5051

Parallelable, Clamped Two-Switch

Power-Supply Controller IC

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AVIN = 12V, PVIN = 12V, V

UVLO

= V

STT

= 3V, V

CON

= 3V, R

RCOSC

= 24kΩ, C

CSS

= 10nF, C

RCOSC

= 100pF, C

REG9

= 4.7µF,

REG5

= 4.7µF, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C. All driver, voltage-regulator, and refer-

ence outputs unconnected except for bypass capacitors.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SOFT-START/REFERENCE (CSS)

Reference Voltage V

CSS

1.215 1.235 1.255 V

Soft-Start Pullup Current I

CSS

70 µA

ERROR AMPLIFIER (CSS, FB, COMP)

FB Input Range V

Inferred from FB offset voltage test 0 3 V

FB Input Current I

= V

REF

±250 nA

COMP Output Range Inferred from FB offset voltage test 2.1 6.0 V

COMP Output Sink Current V

= 3V 20 mA

COMP Output Source Current V

= 0V 30 mA

Open-Loop Gain G

2.1V < V

COMP

< 6V 80 dB

Unity-Gain Bandwidth BW C

COMP

= 50pF, I

COMP

= ±5mA 3 MHz

FB Offset Voltage V

= 0 to 3V; V

COMP

= 2.1V to 6V;

COMP

= -5mA to +5mA

-3 +3 mV

COMP Output Slew Rate SR C

COMP

= 50pF 1 V/µs

PVIN UNDERVOLTAGE LOCKOUT (STT)

PVIN Undervoltage Lockout V

PVIN

rising 22 23.5 25 V

STT Threshold V

STT

rising 1.18 1.24 1.30 V

STT Input Impedance R

STT

100 kΩ

INTEGRATING FAULT PROTECTION (FLTINT)

FLTINT Source Current I

FLTINT

= 0V 90 µA

FLTINT Shutdown Threshold V

FLTINTSD

FLTINT

= rising 2.9 V

FLTINT Restart Hysteresis V

FLTINTHY

0.9 V

OSCILLATOR (RCOSC, SYNCIN, SYNCOUT)

PWM Period t

RCOSC

= 24kΩ, C

RCOSC

= 100pF 3.9 µs

Maximum PWM Duty Cycle D

MAX

RCOSC

= 24kΩ, C

RCOSC

= 100pF 48 %

Maximum RCOSC Frequency f

RCOSCMAX

1 MHz

Maximum SYNCIN Frequency f

SYNCIN

50% duty cycle 500 kHz

SYNCIN High-Level Voltage VH

SYNCIN

Pulse rising 2.1 V

SYNCIN Low-Level Voltage VL

SYNCIN

Pulse falling 0.8 V

SYNCIN Pulldown Resistor 100 kΩ

SYNCIN Rising to SYNCOUT

Falling Delay

30 ns

SYNCIN Falling to SYNCOUT

Rising Delay

70 ns

1 2 3 4 5 6 7 8 ... 20 21

Power-Supply Controller IC 1

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Rainbow-electronics MAX5051 Manual de usuario Pagina 3

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