A8292 Datasheet PDF - Allegro MicroSystems
Part Number | A8292 | |
Description | Dual LNB Supply and Control Voltage Regulator | |
Manufacturers | Allegro MicroSystems | |
Logo | ||
There is a preview and A8292 download ( pdf file ) link at the bottom of this page. Total 19 Pages |
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Dual LNB Supply and Control Voltage Regulator
Features and Benefits
Description
▪ 2-wire serial I2C™ -compatible interface: control (write) and Intended for analog and digital satellite receivers, this dual
status (read)
low-noise block converter regulator (LNBR) is a monolithic
▪ LNB voltages (16 programmable levels) compatible with linear and switching voltage regulator, specifically designed to
all common standards
provide the power and the interface signals to two LNB down
▪ Tracking switch-mode power converter for lowest dissipation converters via coaxial cables. TheA8292 requires few external
▪ Integrated converter switches and current sensing
components, with the boost switches and compensation circuitry
▪ Provides up to 500 mA per channel and 750 mA total
integrated inside of the device. A high switching frequency is
▪ Static current limit circuit allows full current at startup and chosen to minimize the size of the passive filtering components,
13→18V output transition; reliably starts wide load range further assisting in cost reduction. The high level of component
▪ Push-pull output stage minimizes 13→18V and 18→13V
integration ensures extremely low noise and ripple figures.
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
The A8292 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.
▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding The A8292 has integrated tone detection capability, to support
▪ Auxiliary modulation input
full two-way DiSEqC™ communications. Several schemes
▪ LNB overcurrent with timer
are available for generating tone signals, all the way down
▪ Diagnostics for output voltage level, input supply UVLO, to no-load, and using either the internal clock or an external
and DiSEqC™ tone output
▪ Cable disconnect diagnostic
timewww.DataSheet4U.com source.
Package:
28 pin 5 mm × 5mm MLP/QFN
(suffix ET)
Continued on the next page…
Functional Block Diagram
VS
VDD
C2
100 μF
A
Channel 1
L1
33 μH
L3
D1 1 MH
A8292
VIN
C1
100 nF
VREG
C3
220 nF
Regulator
R3
R2
R1
SDA
SCL
I2 C–
Compatible
Interface
IRQ
C5
100 μF
C6
1 μF
R4 R5
C4
100 nF
TDO1 EXTM1 LX1
GNDLX1 BOOST1 VCP1
Boost
Converter
Charge
Pump
C12 D
TMode1
EXTM1
Fsw
DAC
LNB
Voltage
Control
Wave
Shape
TCAP1
TGate1
Fault Monitor
OCP1
OCP2
PNG1
PNG2
TSD
VUV
Fsw
Clock
Divider 22 kHz
Oscillator
PAD
GND
VPump
Linear
Stage
TDO1
Tone
Detect
R6
15 |