Datasheet

Typical application circuits LNBH25L
12/28 Doc ID 022634 Rev 2
5 Typical application circuits
Figure 6. DiSEqC 1.x application circuit
Table 5. Typical application circuit bill of material
Component Notes
R1 (RSEL) SMD resistor. Refer to
Ta bl e 1 2 and ISEL pin description in Ta bl e 2
C1, C2 > 25 V electrolytic capacitor, 100 µF is suitable.
C3 From 470 nF to 2.2 µF ceramic capacitor. Higher values allow lower DC-DC noise.
C5 From 100 nF to 220 nF ceramic capacitor. Higher values allow lower DC-DC noise.
C4, C7 220 nF ceramic capacitors.
D1 STPS130A or similar schottky diode.
D3
BAT54, BAT43, 1N5818, or any low power schottky diode with I
F
(AV) > 0.2 A,
V
RRM
> 25 V, V
F
< 0.5 V. To be placed as close as possible to V
OUT
pin.
D2 1N4001-07, S1A-S1M, or any similar general purpose rectifier.
L1 10 µH inductor with I
sat
> I
peak
where I
peak
is the boost converter peak current.
AM10462v1
L1
C3
Vin
12V
to LNB
LX
Vup
Vout
ADDR
C4
LNBH25L
{
I
2
C Bus
SDA
SCL
P-GND A-GND
D1
C5
ISEL
R1 (RSEL)
Byp
C7
DSQIN
C2
C1
Vcc
D2
DiSEqC
Envelope TTL
or
DiSEqC
22KHz TTL
D3
21
3
17
16
9
8
7
4
15
6
22
20