Rohm BD60A00NUX, Технические заметки, Страница: 20 / 23

Technical Note
20/22
BD60A00NUX, BD60A60NUX
www.rohm.com
2011.12 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
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Selection of external parts
Recommended external parts are as shown below.
When to use other parts than these, select the following equivalent parts.
L1: This coil is for boosting. Recommended capacity value is 10uH. Please use the coil with adequate direct current
capacity and also low direct current resistor.
Value Manufacturer Product number
Size DC current
(mA)
DCR
( Ω )
Vertical Horizontal Height
10µH TDK VLF4012AT-100MR79 4.0 3.8 1.2 800 0.30
10µH TDK VLF302512MT-100M 3.0 2.5 1.2 690 0.25
10µH TOKO 1094AS-100M 3.5 3.7 1.2 760 0.18
10µH TOKO 1229AS-H-100M 3.5 3.7 1.2 750 0.24
Cin: This is bypath capacitor for power supply, which removes power supply noise occurred instantly and provides stable
power supply for IC. In order to obtain better quality, please use low ESR products such as ceramic capacitors.
Recommended capacity value is more than 1µF.
C0: This is output smoothing capacitor. Recommended capacity value is 2.2µF.
When choosing capacitors such as Cin and C0, please be careful of pressure. The base line of pressure is about 2 times of
actual applying voltage. If pressure margin decreases, it might be happened that capacity value becomes almost a half of
nominal value.
Value
Pressur
e
Manufactur
e
Product number
Size
Vertical Horizontal Height
[ Cin : Power supply voltage capacitor]
1.0µF 10V. MURATA GRM185B31A105 1.6. 0.8. 0.5.
[ C0 : Output capacitor ]
1.0µF 50V MURATA GRM31MB31H105 3.2 1.6 1.15
2.2µF 50V MURATA GRM31CB31H225 3.2 1.6 1.6
R1: LED current I
LED
should be decided when activated.
Value Tolerance Manufacturer Product number
Size
I
LED
(mA)
Vertical Horizontal Height
[ R1 : Resistor used for deciding LED current]
20k Ω ±0.5% ROHM MCR03PZPZD2002 1.6 0.8 0.45 30
24k Ω ±0.5% ROHM MCR03PZPZD2402 1.6 0.8 0.45 25
30k Ω ±0.5% ROHM MCR03PZPZD3002 1.6 0.8 0.45 20
56k Ω ±0.5% ROHM MCR03PZPZD5602 1.6 0.8 0.45 10.7
D1: This schottky diode (SBD) is for output rectification. In order to obtain higher switching efficiency, please use low Vf, low
reverse leak, and high current capacity.
Pressure Manufacturer Product Number
Size
Vertical Horizontal Height
60V ROHM RB160M-60 3.5 1.6 0.8
40V ROHM RB521S-40 1.6 0.8 0.6
60V ROHM RB060M-60 3.5 1.6 0.8