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A8286 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. A8286
Description  Dual LNB Supply and Control Voltage Regulator
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A8286 Datasheet(HTML) 1 Page - Allegro MicroSystems

 
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Description
Intended for analog and digital satellite receivers, this dual
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 two LNB down
converters via coaxial cables. TheA8286 requires few external
components,withtheboostswitchesandcompensationcircuitry
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 level of component
integration ensures extremely low noise and ripple figures.
The A8286 has been designed for high efficiency, utilizing
the Allegro® advanced BCD process. The integrated boost
switches have been optimized to minimize both switching and
static losses. To further enhance efficiency, the voltage drop
across the tracking regulators has been minimized.
The A8286 has integrated tone detection capability, to support
full two-way DiSEqC™ 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.
8286-DS, Rev. 17
Dual LNB Supply and Control Voltage Regulator
Continued on the next page…
Functional Block Diagram
A8286
LX1
Boost
Converter
LNB1
VIN
220 nF
TCAP1
22 nF
Clock
Divider
BOOST1
Channel 1
A8286
VOUT1
SDA
SCL
I2 C
Compatible
Interface
Fault Monitor
OCP1
OCP2
PNG1
PNG2
TSD
VUV
EXTM1
VDD
VS
IRQ
GND
Oscillator
Regulator
Tone
Detect
TDO1
TDI1
VREG
TDO1
TCAP1
Fsw
Fsw
22 kHz
EXTM1
TGate1
TMode1
10 nF
GNDLX1
LNB
Voltage
Control
Wave
Shape
Linear
Stage
C7
C8
C10
C3
220 nF
R4
15
R6
L1
33 H
D1
D2
220 H
L2
R5
R7
100
C11
0.68 F
30
R8
D4
R1
R2
R3
220 nF
C9
C
B
A
D3
C
DAC
C12 D
D
VCP1
Charge
Pump
VPump
100 nF
C4
10 nF
C13
100 F
C2
PAD
nF
C1
100
100 F
C5
1 F
C6
L3
1 H
R8-C11 network is needed only when high
inductive load is applied, such as ProBrand LNB.
Channel 1 of 2 channels shown.
B
C
D
A
D3 and D4 are used for surge protection.
Either C12 or C9 should be used, but not both.
Features and Benefits
▪ 2-wire serial I2C™ -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
▪ Output current limit of 900 mA typical, with 48 ms timer
▪ Static current limit circuit allows full current at startup and
13
→18V output transition; reliably starts wide load range
▪ Push-pull output stage minimizes 13
→18V and 18→13V
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™ tone encoding, even at no-load
▪ Four methods of 22 kHz tone generation, via I2C™ data
bits and/or external pin
▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding
▪ Diagnostics for output voltage level, input supply UVLO,
and DiSEqC™ tone output
▪ Cable disconnect diagnostic
▪ Auxiliary modulation input
▪ LNB overcurrent with timer
Package: 28-pin QFN (suffix ET)
5 mm × 5 mm
(Not to scale)


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