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A8291SETTR-TB Datasheet

  • A8291SETTR-TB

  • Single LNB Supply and Control Voltage Regulator

  • 397.26KB

  • 18頁

  • ALLEGRO   ALLEGRO

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A8291
Single LNB Supply and Control Voltage Regulator
Features and Benefits
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2-wire serial I
2
C鈩?-compatible interface: control (write) and
status (read)
LNB voltages (16 programmable levels) compatible with
all common standards
Tracking switch-mode power converter for lowest dissipation
Integrated converter switches and current sensing
Provides up to 500 mA load current
Static current limit circuit allows full current at startup and
13鈫?8 V output transition; reliably starts wide load range
Push-pull output stage minimizes 13鈫?8 V and 18鈫?3 V
output transition times for highly capacitive loads
Adjustable rise/fall time via external timing capacitor
Built-in tone oscillator, factory-trimmed to 22 kHz
facilitates DiSEqC鈩?tone encoding, even at no-load
Four methods of 22 kHz tone generation, via I
2
C鈩?data
bits and/or external pin
Filter bypass MOSFET minimizes losses during tone transmit
22 kHz tone detector facilitates DiSEqC鈩?2.0 decoding
Auxiliary modulation input
LNB overcurrent with timer
Diagnostics for output voltage level, input supply UVLO,
and DiSEqC鈩?tone output
Cable disconnect diagnostic
Description
Intended for analog and digital satellite receivers, this single
low noise block converter regulator (LNBR) is a monolithic
linear and switching voltage regulator, specifically designed to
provide the power and the interface signals to an LNB down
converter via coaxial cable. The A8291 requires few external
components, with the boost switch and compensation circuitry
integrated inside of the device. A high switching frequency is
chosen to minimize the size of the passive filtering components,
further assisting in cost reduction. The high levels of component
integration ensure extremely low noise and ripple figures.
The A8291 has been designed for high efficiency, utilizing
the Allegro
廬
advanced BCD process. The integrated boost
switch has been optimized to minimize both switching and
static losses. To further enhance efficiency, the voltage drop
across the tracking regulator has been minimized.
The A8291 has integrated tone detection capability, to support
full two-way DiSEqC鈩?communications. Several schemes
are available for generating tone signals, all the way down
to no-load, and using either the internal clock or an external
Package:
28 pin 5 mm 脳 5mm MLP/QFN
(suffix ET)
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Functional Block Diagram
V
S
C2
100
渭F
C1
100 nF
VREG
C3
220 nF
V
DD
R1 R2 R3 R4 R5 R6
fsw
EXTM
BFC
TCAP
TDO
SDA
SCL
ADD
TDO
IRQ
PAD
GND
Tone
Detect
TDI
Fault Monitor
I
2
C鈩?
Compatible
Interface
OCP
PNG
TSD
VUV
Clock
Divider 22 kHz
Oscillator
TCAP
C7
10 nF
fsw
TGate
DAC
LNB
Voltage
Control
L1
33
渭H
D1
L3
1 H
C4
100 nF
C5
100
渭F
LX
GNDLX
C6
1
渭F
BOOST VCP
VIN
Charge BFC
Pump
Boost
Converter
TMode
EXTM
Wave
Shape
Linear
Stage
VPump
D2
B
R10
1
B
D5
B
C
Regulator
C12
BFO
BFI
R7
15
V
OUT
LNB
C8
D3 220 nF
R9
30
C11
0.68
渭F
A
L2
220
渭H
C13
10 nF
C9
220 nF
C
D4
B
A
B
C
R9-C11 network is needed only when a highly
inductive load is applied, such as ProBand LNB.
D2, D4, D5, and R10 are used for surge protection.
Either C12 or C9 should be used, but not both.
R8
100
C10
10 nF
8291-DS, Rev.3

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