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BD9015KV-M Fiches technique(PDF) 14 Page - Rohm

No de pièce BD9015KV-M
Description  2ch Synchronous Rectification Step-Down Controller
Download  31 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BD9015KV-M Fiches technique(HTML) 14 Page - Rohm

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Datasheet
Datasheet
14/27
BD9015KV-M BD9016KV-M
TSZ02201-0T1T0PB00040-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
www.rohm.co.jp
TSZ22111・15・001
22 .JUL.2013 Rev.001
(4)Setting the output voltage (VO)
The output voltage is determined by the equation below. Select a combination of R1 and R2 to obtain the required voltage.
Note that a small resistor value leads to a drop in power efficiency and that a large resistor value leads to an increase of the offset voltage
due to FB pin source current of 0.13µA (Typ).
(5)Setting the oscillation frequency (fOSC)
The setting of the internal oscillation frequency is possible by use of the resistor value connecter to RT.
The setting range is 250kHz to 550kHz. The correlation between the resistor value and the oscillation frequency is as shown in the table
and Figure 22. below.
Setting a resistor outside the range shown below may cause the switching to stop after witch operation is no longer guaranteed.
Note that in case the input/output voltage difference is small, the oscillation frequency is divided by 5, reducing the output voltage drop.
The detail behavior is described in the description of Oscillator on page 4.
Figure 22. RT resistor vs. oscillation frequency
(6)Setting the soft start time (TSS)
The soft start function is necessary to prevent inrush of coil current and output voltage overshoot at startup. The Figure 23. shows the
relation between soft start time and capacitance, which can be calculated by using the equation.
0.8V(Typ) × CSS
TSS =
[sec]
ISS(10μA (Typ))
Figure 23. Capacitance vs. Soft Start Time
Capacitance values between 0.01µF and 0.1µF are recommended. There is a possibility that an overshoot is generated in
the output due to the phase compensation, output capacitor, etc. Therefore, verification and confirmation with the actual
application is recommended. Use high accuracy components (X5R) when implementing sequential startups involving other
power sources.
RT Resistor
Oscillation Frequency
180k
200k
220k
240k
270k
300k
250kHz
300kHz
350kHz
400kHz
480kHz
550kHz
100
200
300
400
500
600
700
150
200
250
300
350
RT RESITANCE[k
Ω]
0.1
1
10
0.01
0.1
SS CAPACITANCE[µF]
Figure 21. Setting the Output Voltage
VO = 0.8 ×
R1 + R2
R2


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