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BL8083 Datasheet(PDF) 7 Page - SHANGHAI BELLING CO., LTD.

Part No. BL8083
Description  PMU with a Synchronous 18V 2A Buck and a CMOS 6V 1.5A LDO
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Maker  BELLING [SHANGHAI BELLING CO., LTD.]
Homepage  http://www.belling.com.cn
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BL8083 Datasheet(HTML) 7 Page - SHANGHAI BELLING CO., LTD.

   
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BL8083
Load Transient Response (VI=5V,VOUT=3.3V)
C4=1uF,C5=1uf,IOUT=1mA-100mA
Line Transient Response(VOUT=3.3V)
C4=1uF,C5=1uf,IOUT=10mA,VI=4.3V-5.3V
DETAILED DESCRIPTION
Internal Regulator
The BL8083 is a current mode step down DC/DC
converter
that
provides
excellent
transient
response with no extra external compensation
components. This device contains an internal, low
resistance, high voltage power MOSFET, and
operates at a high 500K operating frequency to
ensure a compact, high efficiency design with
excellent AC and DC performance.
Error Amplifier
The error amplifier compares the FB pin voltage
with the internal FB reference (VFB) and outputs a
current proportional to the difference between the
two. This output current is then used to charge or
discharge the internal compensation network to
form the COMP voltage, which is used to control
the power MOSFET current. The optimized internal
compensation network minimizes the external
component counts and simplifies the control loop
design.
Internal Soft-Start
The soft-start is implemented to prevent the
converter output voltage from overshooting during
startup. When the chip starts, the internal circuitry
generates a soft-start voltage (SS) ramping up from
0V to 0.8V. When it is lower than the internal
reference (REF), SS overrides REF so the error
amplifier uses SS as the reference. When SS is
higher than REF, REF regains control. The SS time is
internally fixed to 1ms.
Over-Current-Protection
The BL8083 has over current limit when the output
current peak value exceeds the set current limit
threshold. Chip output short circuit to the ground,
will not be burned.
Startup and Shutdown
If VDD and EN are higher than their appropriate
thresholds, the chip starts. The reference block
starts first, generating stable reference voltage and
currents, and then the internal regulator is enabled.
The regulator provides stable supply for the
remaining circuitries. Three events can shut down
the chip: EN low, VDD low and thermal shutdown.
In the shutdown procedure, the signaling path is
first blocked to avoid any fault triggering. The
COMP voltage and the internal supply rail are then
pulled down. The floating driver is not subject to
this shutdown command.
APPLICATIONS INFORMATION
Setting Buck Vout Voltages
The external resistor divider is used to set the Buck
Vout voltage (see Typical Application on page 1).
The feedback resistor R1 can also set the feedback
loop bandwidth with the internal compensation
capacitor. Choose R1 to be around 300KΩ for
optimal transient response. R2 is then given by:


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