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VNB49N04

“OMNIFET”: FULLY AUTOPROTECTED POWER MOSFET

STMicroelectronics 

VNP49N04FI / VNB49N04 / VNV49N04

PROTECTION FEATURES

During normal operation, the INPUT pin is

electrically connected to the gate of the internal

power MOSFET. The device then behaves like a

standard power MOSFET and can be used as a

switch from DC up to 50KHz. The only difference

from the user’s standpoint is that a small DC

current (IISS) flows into the INPUT pin in order to

supply the internal circuitry.

The device integrates:

- OVERVOLTAGE CLAMP PROTECTION:

internally set at 42V, along with the rugged

avalanche characteristics of the Power MOSFET

stage give this device unrivalled ruggedness and

energy handling capability. This feature is mainly

important when driving inductive loads.

- LINEAR CURRENT LIMITER CIRCUIT:

limits the drain current ID to ILIM whatever the

INPUT pin voltage. When the current limiter is

active, the device operates in the linear region, so

power dissipation may exceed the capability of the

heatsink. Both case and junction temperatures

increase, and if this phase lasts long enough,

junction temperature may reach the

overtemperature threshold Tjsh.

- OVERTEMPERATURE AND SHORT CIRCUIT

PROTECTION:

these are based on sensing the chip temperature

and are not dependent on the input voltage. The

location of the sensing element on the chip in the

power stage area ensures fast, accurate detection

of the junction temperature. Overtemperature

cutout occurs at minimum 150°C. The device is

automatically restarted when the chip temperature

falls below 135°C.

- STATUS FEEDBACK:

in the case of an overtemperature fault condition, a

status feedback is provided through the INPUT

pin. The internal protection circuit disconnects the

input from the gate and connects it instead to

ground via an equivalent resistance of 100Ω. The

failure can be detected by monitoring the voltage

at the INPUT pin, which will be close to ground

potential. Additional features of this device are

ESD protection according to the Human Body

model and the ability to be driven from a TTL Logic

circuit (with a small increase in RDS(ON)).

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