BD63536FJ Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BD63536FJ

Step-down,High-frequency Switching Regulator (Controller type)

ROHM Semiconductor 

BD63536FJ

Technical Note

●Protection circuits

○Thermal shutdown (TSD) circuit

This IC has a built-in thermal shutdown (TSD) circuit as overheat protection. When the IC chip temperature exceeds

175C (typ), GATE output will be turned OFF. When the temperature falls below 155C (typ), the IC will return to the

normal operation. In this case, the normal operation starts up in the soft start sequence. However, if external heat is

continually applied to the IC even when the TSD circuit is in operation, the IC may cause thermal runaway, resulting in

breakdown.

○Overcurrent protection circuit (Current limit function)

This IC has a built-in overcurrent protection circuit. This circuit is a circuit absolutely intended to protect the IC from

breakdown due to overcurrent in abnormal states such as output short circuit, not intended to protect or guarantee sets

with the overcurrent protection circuit incorporated. Consequently, do not design the protection of sets making use of the

function of this circuit. For practical use, take physical safety measures such as use of fuses.

○Undervoltage lockout (UVLO) function

This IC has a built-in undervoltage lockout circuit to prevent malfunctions such as IC output at low power supply voltages.

If power supply voltage falls below the operating voltage range, this UVLO function will be activated. However, if a voltage

applied to the VCC pin reaches 2.35V (typ), the UVLO function will turn OFF the Gate output once. The switching voltage is

provided with hysteresis of approximately 0.15V (typ) in order to prevent malfunctions such as noises. If the UVLO

function is cleared, the IC will start up in the soft start sequence.

○Overvoltage protection (OVP) function

This IC has a built-in overvoltage protection function as a protection circuit for a rise in power supply voltage. If power

supply voltage exceeds the absolute maximum rating, this OVP function will be activated. However, if a voltage applied to

the VCC pin exceeds 33.5V (typ), the OVP function will turn OFF the Gate output once. The switching voltage is provided

with hysteresis of approximately 1V (typ) in order to prevent malfunctions such as noises. If the OVP function is reset, the

IC will start up in the soft start sequence.

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10/16

2009.11 - Rev.A

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