Datasheet

Typical application circuit LNBH23L
12/25 Doc ID 15335 Rev 4
Figure 5. DiSEqC 1.x using external 22 kHz tone generator source through EXTM pin
L1
C6
470nF
D3
V
in
12V
to LNB
500mA max
D2
LX
Vup
VoRX
C1
LNBH23L
P
-
GND A
-
GND
D1
C10
220nF
C4
470nF
VoTX
I
2
C Bus
SCL
EXTM
ADDR
TTX
C15
220nF
22KHz signal source
{
SDA
PDC
ISEL
Byp
C11
220nF
DSQIN
C3
Vcc -L
Vcc
C8
220nF
L1
C6
D3D3
V
in
12V
to LNB
500mA max
D2D2
C1
LNBH23L
D1D1
C10
220nF
C10
220nF
C4
470nF
C4
470nF
I
2
C15
220nF
C15
220nF
22KHz signal source
{
PDC
ISEL
C11
220nF
DSQIN
PDC
ISEL
R2 (RSEL)
15kOhm
DSQIN
L1
C6
470nF
D3
V
in
12V
to LNB
500mA max
D2
LX
Vup
VoRX
C1
LNBH23L
P
-
GND A
-
GND
D1
C10
220nF
C4
470nF
VoTX
I
2
C Bus
SCL
EXTM
ADDR
TTX
C15
220nF
22KHz signal source
{
SDA
PDC
ISEL
Byp
C11
220nF
DSQIN
C3
Vcc -L
Vcc
C8
220nF
L1
C6
D3D3
V
in
12V
to LNB
500mA max
D2D2
C1
LNBH23L
D1D1
C10
220nF
C10
220nF
C4
470nF
C4
470nF
D1D1
C10
220nF
C10
220nF
C4
470nF
C4
470nF
I
2
C15
220nF
C15
220nF
22KHz signal source
{
PDC
ISEL
C11
220nF
DSQIN
PDC
ISEL
R2 (RSEL)
15kOhm
DSQIN
Table 5. BOM list
Component Notes
R2, R9, R5
(1)
1/16 W resistors. Refer to the typical application circuit for the relative values
R7
(1)
, R8
(1)
1/2 W resistors. Refer to the typical application circuit for the relative values
C1 25 V electrolytic capacitor, 100 µF or higher is suitable
C3 25 V, 220 µF electrolytic capacitor, ESR in the 100 mΩ to 350 mΩ range
C4, C6, C8, C10, C11, C15,
C14
(1)
25 V ceramic capacitors. Refer to the typ. appl. circuit for the relative values
D1
STPS130A or any similar schottky diode with V
RRM
> 25 V and I
F(AV)
higher than:
I
F(AV)
> I
OUT_MAX
x (V
UP_MAX
/V
IN_MIN
)
D2
BAT43, 1N5818, or any 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
oRX
pin
D3 1N4001-07 or any similar general purpose rectifier
TR1
(1)
BC817 or similar NPN general-purpose transistor.
L1
22 µH inductor with I
SAT
> I
PEAK
where I
PEAK
is the boost converter peak current (see
Equation 1)
1. These components can be added to avoid any 22 kHz tone distortion due to heavy capacitive output loads. If not needed
they can be removed leaving the PDC pin floating.