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BL8532B Datasheet(PDF) 6 Page - SHANGHAI BELLING CO., LTD.

Part # BL8532B
Description  White LED PFM Step-Up DC-DC Converter
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Manufacturer  BELLING [SHANGHAI BELLING CO., LTD.]
Direct Link  http://www.belling.com.cn
Logo BELLING - SHANGHAI BELLING CO., LTD.

BL8532B Datasheet(HTML) 6 Page - SHANGHAI BELLING CO., LTD.

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http://www.belling.com.cn
- 6-
2/20/2013
Total 13 Pages
BL8532B
For example, input 1.5V, output 3.0V, load 20
(150mA),rL=0.5 ,efficiency loss 10% .
Considering, suggest to use an inductance of 15 uH , <0.5 .
(2)
)Capacitor Selection
No considering the inductor with equivalent series resistor(ESR), output voltage ripple is:
r=
Vout
Vout
=
Cf
R
D
load
considering the inductor’s ESR, the output ripple will be increase:
Vout
R
ax
r
r
ESR
+
=
Im
Suggest to use Tantalum type with the low ESR or more parallel-resistor.
(3)
)Diode Selection
It is recommended that the diode have great effect to DC-DC efficiency, we suggest to use
schottky diode with the lower positive turn-on voltage and the lower corresponsive time. For
example, 1N5817、1N5819 .
(4)
)Input Capacitor
Power supply is stably, even if no input capacitor, DC-DC can output voltage with the lower
ripple and the lower noise. But we suggest to connect with the capacitor of 10uF or more when
the power supply was far away DC-DC, for minish the output noise.
(5)
)Resistor R1、
、R2 for output voltage detect
Application to invariant current , the formula of R1、R2:
1
2
1 +
=
R
R
V
Vout
IFB


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