Rainbow-electronics MAX14528 Manual do Utilizador descarregar pdf (Página 5)

Detailed Description

The MAX14527/MAX14528 overvoltage protection

devices feature a low R

internal FET and protect low-

voltage systems against voltage faults up to +28V. If

the input voltage exceeds the overvoltage threshold,

the internal FET is turned off to prevent damage to the

protected components. The 15ms debounce time pre-

vents false turn-on of the internal FET during startup.

Device Operation

The MAX14527/MAX14528 have timing logic that

controls the turn-on of the internal FET. If V

OVLO_THRESH

, the internal charge pump is enabled.

The charge-pump startup, after a 15ms debounce

delay, turns on the internal FET (see the

Functional

Diagram

). At any time, if V

rises above V

OVLO_

THRESH

, OUT is disconnected from IN.

MAX14527/MAX14528

Adjustable Overvoltage Protector

with High Accuracy

_______________________________________________________________________________________ 5

Pin Description

Functional Diagram

OUT

OVLO

GND

CHARGE

PUMP

LOGIC

CONTROL

SEL

REFERENCE

TEMPERATURE

FAULTS

MAX14527

MAX14528

NAME

FUNCTION

1, 2 IN

Voltage Input. Bypass IN with a 1µF ceramic capacitor as close as possible to the device to obtain ±15kV

Human Body Model (HBM) ESD protection. Connect all the IN pins together for proper operation. IN is

protected to ±2kV HBM when IN is not bypassed with a capacitor to GND.

OVLO

External OVLO Adjustment. Connect OVLO to GND when using the internal threshold. Connect a resistor-

divider to OVLO to set a different OVLO threshold; this external resistor-divider is completely independent

from the internal threshold.

4, 5 I.C. Internally Connected. Do not connect. Leave I.C. unconnected.

6 GND Ground

7, 8 OUT Output Voltage. Output of internal switch. Connect all the OUT outputs together for proper operation.

—EP

Exposed Pad. Connect exposed pad to ground. For enhanced thermal dissipation, connect EP to a copper

area as large as possible. Do not use EP as a sole ground connection.

1 2 3 4 5 6 7

MAX14527/MAX14528 1

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