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BL8530 Datasheet(PDF) 5 Page - SHANGHAI BELLING CO., LTD.

Part # BL8530
Description  PFM STEP-UP DC/DC CONVERTER WITH HIGH EFFICIENCY AND LOW NOISE
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Manufacturer  BELLING [SHANGHAI BELLING CO., LTD.]
Direct Link  http://www.belling.com.cn
Logo BELLING - SHANGHAI BELLING CO., LTD.

BL8530 Datasheet(HTML) 5 Page - SHANGHAI BELLING CO., LTD.

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Ver1.0
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BL8530
Before discussion,we define
Vout
Vin
Vout
D
.
(1)Inductor Selection
Above all, we should define the minimum value of the inductor that can ensure the boost
DC-DC to operate in the continuous current-mode condition.
f
R
D
D
L
L
2
)
1
(
min
2
The above expression is got under conditions of continuous current mode, neglect Schottky
diode’s voltage, ESR of both inductor and capacitor. The actual value is greater that it. If inductor’s
value is less than Lmin,the efficiency of DC-DC converter will drop greatly, and the DC-DC circuit will
not be stable.
Secondly, consider the ripple of the output voltage,
Lf
Vin
D
I
=
Lf
DVin
R
D
Vin
ax
L
2
)
1
(
Im
2
+
=
If inductor value is too small, the current ripple through it will be great. Then the current through
diode and power switch will be great. Because the power switch on chip is not ideal switch, the
energy of switch will improve. The efficiency will fall.
Thirdly,in general, smaller inductor values supply more output current while larger values start
up with lower input voltage and acquire high efficiency.
An inductor value of 3uH to 1mH works well in most applications. If DC-DC converter delivers
large output current (for example: output current is great than 50mA), large inductor value is
recommended in order to improve efficiency. If DC-DC must output very large current at low input
supply voltage, small inductor value is recommended.
The ESR of inductor will effect efficiency greatly. Suppose ESR value of inductor is rL,Rload is
load resistor,then the energy can be calculated by following expression :
2
)
1
(
D
R
r
load
L
η
For example: input 1.5V, output is 3.0V, Rload=20Ω, rL=0.5Ω, The energy loss is 10%.
Consider all above,inductor value of 47uH、ESR<0.5Ω is recommended in most applications.
Large value is recommended in high efficiency applications and smaller value is recommended
(2)Capacitor Selection
Ignore ESR of capacitor,the ripple of output voltage is:
Cf
R
D
Vout
Vout
r
load
=
=
So large value capacitor is needed to reduce ripple. But too large capacitor value will slow
down system reaction and cost will improve. So 100uF capacitor is recommended. Larger
capacitor value will be used in large output current system. If output current is small (<10mA),
small value is needed.
Consider ESR of capacitor,ripple will increase:
Vout
R
ax
r
r
ESR
+
=
Im
'
When current is large, ripple caused by ESR will be main factor. It may be greater than 100mV。
The ESR will affects efficiency and increase energy loss. So low-ESR capacitor (for example:
tantalum capacitor) is recommend or connect two or more filter capacitors in parallel.


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