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Allegro MicroSystems - Single LNB Supply and Control Voltage Regulator

Numéro de référence A8293
Description Single LNB Supply and Control Voltage Regulator
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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A8293 fiche technique
A8293
Single LNB Supply and Control Voltage Regulator
Features and Benefits
Description
2-wire serial 2IC™ -compatible interface: control (write) and Intended for analog and digital satellite receivers, this single
status (read)
low noise block converter regulator (LNBR) is a monolithic
LNB voltages (8 programmable levels) compatible with
linear and switching voltage regulato,rspecifically designed to
all common standards including domestic Japan models
provide the power and the interface signals to an LNB down
Tracking switch-mode power converter for lowest dissipation converter via coaxial cable. The A8293 requires few external
Integrated converter switches and current sensing
components, with the boost switch and compensation circuitry
Provides up to 700 mA load current
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,
1318V output transition; reliably starts wide load range further assisting in cost reductionT. he high levels of component
Push-pull output stage minimizes 1318V and 1813 V integration ensure 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 A8293 has been designed for high ef ficiency, utilizing
the Allegro® advanced BCD process. The integrated boost
switch has been optimized to minimize both switching and
static losses. To further enhance ef ficiency, the voltage drop
across the tracking regulator has been minimized.
Auxiliary modulation input
For DiSEqC™ communications, several schemes are available
LNB overcurrent with timer
for generating tone signals, all the way down to no-load, and
Diagnostics for output voltage level, input supply UVLO using either the internal clock or an external time source.
Packages:
20-contact, 4 × 4 mm
MLP/QFN (suffix ES)
28 contact, 5 × 5 mm
MLP/QFN (suffix ET)
Continued on the next page…
VS
VREG
C3
220 nF
VDD
R1 R2 R3 R4
EXTM
SDA
SCL
ADD
Functional Block Diagram
L1
33 μH
D1
C1
100 nF
C2
100 μF
VIN
C5
100 μF
C6
1 μF
C4
100 nF
LX GNDLX BOOST VCP
Regulator
DAC
I2 C™-
Compatible
Interface
Charge
Pump
D3
A
Boost
Converter
fsw
LNB
Voltage
Control
EXTM
TMode
Wave
Shape
Linear
Stage
TCAP
Fault Monitor
TGate
fsw
OCP
PNG
TSD
VUV
Clock
Divider 22 kHz
Oscillator
LNB
D2
C8
100 nF
C10
220 nF
VOUT
D4
C9
10 nF
A
TCAP
C7
10 nF (or 22 nF)
IRQ
PAD
For recommended external components, refer to table 7
8293-DS, Rev. 4
GND
A D3 and D4 are used for surge protection.
http://www.Datasheet4U.com

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