BD9A300MUV
(2) Under Voltage Lockout Protection (UVLO)
The Under Voltage Lockout Protection circuit monitors the AVIN terminal voltage.
The operation enters standby when the AVIN terminal voltage is 2.45V(Typ) or lower.
The operation starts when the AVIN terminal voltage is 2.55V(Typ) or higher.
VIN
0V
UVLO OFF
hys
UVLO ON
VOUT
Soft Start
FB
Terminal
Top MOSFET Gate
Bottom MOSFET
Gate
Normal Operation
UVLO
Normal Operation
Figure 47. UVLO Timing Chart
(3)
Thermal Shutdown
When the chip temperature exceeds Tj= 175C, the DC/DC converter output is stopped. The thermal shutdown
circuit is intended for shutting down the IC from thermal runaway in an abnormal state with the temperature
exceeding Tjmax =150C. It is not meant to protect or guarantee the soundness of the application. Do not use the
function of this circuit for application protection design.
(4)
(5)
Over Current Protection
The Over Current Protection function operates by using the current mode control to limit the current that flows
through the High-side MOSFET at each cycle of the switching frequency. The designed over current limit value is
6.0A(Typ).
Over Voltage Protection (OVP)
Over voltage protection function(OVP) compares FB terminal voltage with internal standard voltage VREF and when
FB terminal voltage exceeds 0.88V(Typ) it turns MOSFET of output part MOSFET off. After output voltage drop it
returns with hysteresis.
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