Rainbow-electronics MAX5929 Manual do Utilizador descarregar pdf (Página 10)

MAX5927/MAX5929

The MAX5927/MAX5929 turn off all channels if any of

the above conditions are not met. After a fault-latched

shutdown, cycle any of the ON_ inputs to unlatch and

restart all channels.

Power-Sequencing Mode

Leave MODE floating to enter power-sequencing

mode. While in power-sequencing mode, the

MAX5927/MAX5929 turn on and off each channel

depending on the state of the corresponding V

ON_

. To

turn on a given channel:

• At least one V

IN_

must exceed V

UVLO

(2.45V) for the

UVLO to startup delay (37.5ms).

• All V

IN_

must exceed V

PWRRDY

(0.95V).

• The corresponding V

ON_

must exceed V

ON,TH

(0.875V).

• No faults may be present on any channel.

Low-Voltage, Quad, Hot-Swap

Controllers/Power Sequencers

10 ______________________________________________________________________________________

FAST COMP.

SLOW COMP.

FAST DISCHARGE

OUT1

2.45V

BIAS AND

REFERENCES

STARTUP

OSCILLATOR

TIMING

OSCILLATOR

CHARGE

PUMP

DEVICE CONTROL

LOGIC

SC, TH

FC, TH

LIM1

SENSE1

IN1

GATE1

SENSE1

LIM1*

TIM

1nF

BIAS POL*

LIM2

100µA

UVLO

FAST COMP.

SLOW COMP.

FAST DISCHARGE

SLOW DISCHARGESLOW DISCHARGE

OUT2

CHARGE

PUMP

CURRENT CONTROL

AND

STARTUP LOGIC

CURRENT CONTROL

AND

STARTUP LOGIC

SC, TH

FS, TH

SENSE2

IN2

GATE2

SENSE2

LIM2*

100µA

STAT2STAT1

LIM3*

LIM4*

FAST COMP.

SLOW COMP.

FAST DISCHARGE

OUT3

FAULT

MANAGEMENT

OPERATION

MODE

CHARGE

PUMP

INPUT

CONPARATORS

SC, TH

FS, TH

SENSE3

IN3

GATE3

SENSE3

LIM3

LIM4

100µA

UVLO

FAST COMP.

SLOW COMP.

FAST DISCHARGE

SLOW DISCHARGESLOW DISCHARGE

OUT4

CHARGE

PUMP

CURRENT CONTROL

AND

STARTUP LOGIC

CURRENT CONTROL

AND

STARTUP LOGIC

SC, TH

FS, TH

SENSE4

IN4

GATE4

SENSE4

100µA

3mA/

50mA

3mA/

50mA

3mA/

50mA

3mA/

50mA

STAT4

STAT3*MAX5927 ONLY. LATCH* MODEON1 ON2 ON3 ON4

MAX5927

MAX5929

Figure 1. Functional Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 24 25

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Rainbow-electronics MAX5929 Manual do Utilizador Página 10

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