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BD9P1X5EFV-C 데이터시트(PDF) 7 Page - Rohm

부품명 BD9P1X5EFV-C
상세설명  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BD9P1X5EFV-C 데이터시트(HTML) 7 Page - Rohm

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TSZ02201-0J1J0AL01480-1-2
© 2019 ROHM Co., Ltd. All rights reserved.
08.Apr.2020 Rev.002
www.rohm.com
TSZ22111
• 15 • 001
BD9P1x5EFV-C Series
Description of Blocks
-
PreReg
This block is the internal power supply for TSD and VREF circuits.
-
VREG
This block is the internal power supply circuit. It outputs 3.3 V (Typ) and is the power supply to the control circuit and
Driver.
-
TSD
This is the thermal shutdown circuit. It will shut down the device when the junction temperature (Tj) reaches to 175 °C
(Typ) or more. When the Tj falls below the TSD threshold with hysteresis of 25 °C (Typ), the circuits are automatically
restored to normal operation.
-
VREF
The VREF block generates the internal reference voltage.
-
POR
The POR block is power on reset for internal logic circuit. The IC releases power on reset and starts operation with soft
start when the VIN rises to 3.8 V (Typ) or more.
-
UVLO REG
The UVLO block is for under voltage lockout protection. It will shut down the device when the VREG falls to 2.85 V (Typ)
or less. This protection is released when VREG voltage increase to 2.95 V (Typ) or more.
-
MODE
This block detects the MODE pin signal and controls switching mode. When the MODE pin is logic high level or is
applied external clock, switching operation becomes forced PWM mode regardless load current. When the MODE pin is
open or logic low level, switching operation changes between PWM and light load operation depending on load current.
-
OSC
This block generates the clock frequency. When the clock is applied to the MODE pin, it synchronizes to external clock.
Connect the SSCG pin to GND to disable Spread Spectrum function and connect the SSCG pin to the VREG pin to
enable it.
-
OVP
This is the output over voltage protection (OVP) circuit. When the output voltage +7.3 % (Typ) or more of the normal
regulation voltage, VOUT is reduced by forced PWM switching. After output voltage falls +4.7 % (Typ) or less, the
operation recovers into normal condition.
-
SCP
This is the short circuit protection circuit. After soft start is completed, the switching is disabled if the output voltage falls
SCP Threshold voltage or less for 0.9 ms (Typ). This short circuit protection is maintained for 30 ms (Typ) and then
automatically released.
-
Soft Start
This function starts up the output voltage taking 3 ms (Typ) to prevent the overshoot.
-
GmAmp1
This block is an error amplifier and its inputs are the reference voltage 0.8 V (Typ) and the FB voltage.
-
GmAmp2
This block sends the signal Vc which is composed of the GmAmp1 output and the current sense signal to PWM Comp.
-
Clamper1
This block clamps GmAmp1 output voltage and inductor current. It works as the over current protection and LLM control
current.
-
Clamper2
This block clamps GmAmp2 output voltage.
-
Current Sense
This block detects the amount of change in inductor current through the Low Side FET and sends a current sense signal
to GmAmp2.


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