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LNBH25 Datasheet(PDF) 14 Page - STMicroelectronics

Part # LNBH25
Description  Selectable output current limit by external resistor
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LNBH25 Datasheet(HTML) 14 Page - STMicroelectronics

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Typical application circuits
LNBH25
14/34
Doc ID 022433 Rev 4
5
Typical application circuits
Figure 6.
DiSEqC 1.x application circuit
Table 5.
DiSEqC 1.X bill of material
Component
Notes
R1 (RSEL)
SMD resistor. Refer to
Table 13 and ISEL pin description in Table 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 IF (AV) > 0.2 A,
VRRM > 25 V, VF < 0.5 V. To be placed as close as possible to VOUT pin.
D2
1N4001-07, S1A-S1M, or any similar general purpose rectifier.
L1
10 µH inductor with Isat > Ipeak where Ipeak is the boost converter peak current.
L1
C3
Vin
12V
to LNB
LX
Vup
Vout
ADDR
C4
LNBH25
{
I2C Bus
SDA
SCL
P-GND
A -GND
D1
C5
ISEL
R1 (RSEL)
Byp
C7
DSQIN
C2
C1
Vcc
D2
FLT
DiSEqC
Envelope
TTL
or
DiSEqC
22KHz
TTL
D3
21
3
17
16
9
8
7
4
15
6
2
22
20
AM10431v1



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