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A8290SETTR-TB Datasheet

  • A8290SETTR-TB

  • Single LNB Supply and Control Voltage Regulator

  • 19頁

  • ALLEGRO   ALLEGRO

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A8290
Single LNB Supply and Control Voltage Regulator
Features and Benefits
鈻?/div>
2-wire serial I
2
C鈩?-compatible interface: control (write) and
status (read)
鈻?/div>
LNB voltages (16 programmable levels) compatible with
all common standards
鈻?/div>
Tracking switch-mode power converter for lowest dissipation
鈻?/div>
Integrated converter switches and current sensing
鈻?/div>
Provides up to 650 mA continuous load current
鈻?/div>
Provides up to 700 mA of current for 2000 ms
鈻?/div>
Output current limit of 900 mA typical, with 48 ms timer
鈻?/div>
Static current limit circuit allows full current at startup and
13
鈫?/div>
18 V output transition; reliably starts wide load range
鈻?/div>
Push-pull output stage minimizes 13
鈫?/div>
18 V and 18
鈫?/div>
13 V
output transition times for highly capacitive loads
鈻?/div>
Adjustable rise/fall time via external timing capacitor
鈻?/div>
Built-in tone oscillator, factory-trimmed to 22 kHz
facilitates DiSEqC鈩?tone encoding, even at no-load
鈻?/div>
Four methods of 22 kHz tone generation, via I
2
C鈩?data
bits and/or external pin
鈻?/div>
Filter bypass MOSFET minimizes losses during tone transmit
鈻?/div>
22 kHz tone detector facilitates DiSEqC鈩?2.0 decoding
鈻?/div>
Provides V
OUT
within 19 to 21 VDC at 700 mA for
SWM (single wire multiswitch) operation
鈻?/div>
Diagnostics for output voltage level, input supply UVLO,
and DiSEqC鈩?tone output
鈻?/div>
Auxiliary modulation input
鈻?/div>
LNB overcurrent with timer
鈻?/div>
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 A8290 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 A8290 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 A8290 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 time
source. A DiSEqC鈩?filter bypass switch is also integrated, to
minimize the output impedance during tone generation.
Continued on the next page鈥?/div>
Package:
28 pin 5 mm 脳 5mm MLP/QFN
(suffix ET)
L1
33
渭H
Functional Block Diagram
A
B
C
V
S
C2
100
渭F
C1
100 nF
VREG
C3
220 nF
VIN
LX
D1
C5
100
渭F
GNDLX
L3
1 H
C6
0.68
渭F
BOOST VCP
R10
1
B
D5
B
C
C4
100 nF
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.
Charge BFC
Pump
Boost
Converter
TMode
fsw
EXTM
LNB
Voltage
Control
V
DD
R1 R2 R3 R4 R5 R6
Regulator
VPump
D2
B
C12
BFO
BFI
R7
15
EXTM
BFC
DAC
Wave
Shape
TCAP
Linear
Stage
V
OUT
LNB
C8
D3 220 nF
R9
30
L2
220
渭H
C13
10 nF
C9
220 nF
C
D4
B
TDO
SDA
SCL
ADD
Fault Monitor
I
2
C鈩?
Compatible
Interface
OCP
PNG
TSD
VUV
fsw
TGate
Clock
Divider 22 kHz
Oscillator
C11
0.68
渭F
TCAP
C7
10 nF
Tone
Detect
A
TDO
IRQ
PAD
GND
TDI
R8
100
C10
10 nF
8290-DS, Rev.2

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