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BD8152FVM Datasheet(PDF) 9 Page - Rohm

Part # BD8152FVM
Description  High-efficiency Step-up Switching Regulators with Built-in Power MOSFET
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD8152FVM Datasheet(HTML) 9 Page - Rohm

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BD8152FVM, BD8158FVM
Technical Note
9/17
www.rohm.com
2010.03 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
(4) Selecting the output rectification diode
Schottky barrier diode is recommended as the rectification diode to use at the DC/DC converter output stage. Select the
diode paying attention to the max. inductor current and max. output voltage.
Max. Inductor current
IINMAX + ∆IL
<
Rating current of diode
Max. output voltage
VOMAX
<
Rating voltage of diode
Since each parameter has 30% to 40% of dispersion, be sure to design providing sufficient margins.
(5) Design of the feedback resistor constant
Refer to the following equation to set the feedback resistor. As the setting range, 10 kΩ to 330 kΩ is recommended. If
the resistor is set to 10 kΩ or lower, it causes the reduction of power efficiency. If it is set to 330 kΩ or larger, the offset
voltage becomes larger by the input bias current 0.4 µA (Typ.) in the internal error amp.
Step-up
(6) Setting the soft start time
Soft start is required to prevent the coil current at the time of startup
from increasing and the overshoot of the output voltage at the
starting time. Fig.26 shows the relation between the capacitance and
soft start time. Please refer to it to set the capacitance.
As the capacitance, 0.001 µF to 0.1 µF is recommended. If the
capacitance is set to 0.001 µF or lower, the overshooting may occur
on the output voltage. If the capacitance is set to 0.1 µF or larger, the
excessive back current flow may occur in the internal parasitic
elements when the power is turned off and it may damage IC. When
the capacitor to 0.1 µF or larger is used, be sure to insert a diode to
VCC in series, or a bypass diode between the SS pin and VCC.
Fig. 27 Bypass Diode Example
When there is the startup relation (sequences) with other power supplies, be sure to use the high accuracy product (such as X5R).
Soft start time may vary according to the input voltage, output voltage, loads, coils and output capacity. Be sure to verify
the operation using the actual product.
(7) Setting the ENB pin
When the ENB pin is set to Hi, the internal circuit becomes active and the DC/DC converter starts operating. When it is
set to Low, the shut down is activated and all circuits will be turned off.
(8) Setting the frequency by FCLK
It is possible to change the switching frequency by setting the FCLK pin to Hi or Low. When it is set to Low, the product
operates at 600 kHz (Typ.). When it is set to Hi, the product operates at 1,200 kHz (Typ.).
Vo =
R8 + R9
 1.245
[V]
R9
Vo
R8
R9
ERR
Reference voltage 1.245 V
FB
2
0.01
0.1
1
10
0.001
0.01
0.1
SS CAPACITANCE[uF]
Fig. 25 Feedback Resistor Setting
VCC
Output pin
Back current prevention diode
Bypass diode
Fig. 26 SS Pin Capacitance vs
Delay Time


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