A8286SETTR-TB ALLEGRO [Allegro MicroSystems], A8286SETTR-TB Datasheet

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A8286SETTR-TB

Manufacturer Part Number
A8286SETTR-TB
Description
Dual LNB Supply and Control Voltage Regulator
Manufacturer
ALLEGRO [Allegro MicroSystems]
Datasheet
1.A8286SETTR-TB.pdf (19 pages)
Features and Benefits
▪ 2-wire serial I
▪ LNB voltages (16 programmable levels) compatible with
▪ Tracking switch-mode power converter for lowest dissipation
▪ Integrated converter switches and current sensing
▪ Provides up to 650 mA per channel and 1.0 A total
▪ Provides up to 700 mA per channel and 1.1 A total for 2000 ms
▪ Output current limit of 900 mA typical, with 48 ms timer
▪ Push-pull output stage minimizes 13→18 V and 18→13 V
▪ Adjustable rise/fall time via external timing capacitor
▪ Built-in tone oscillator, factory-trimmed to 22 kHz
▪ Four methods of 22 kHz tone generation, via I
▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding
▪ Auxiliary modulation input
▪ LNB overcurrent with timer
▪ Provides V
▪ Diagnostics for output voltage level, input supply UVLO,
▪ Cable disconnect diagnostic
8286-DS, Rev. 3
Package:
28 pin 5 mm × 5mm
QFN/MLP (suffix ET)
▪ Static current limit circuit allows full current at startup and
and status (read)
all common standards
continuous load current
13→18 V output transition; reliably starts wide load range
output transition times for highly capacitive loads
facilitates DiSEqC™ tone encoding, even at no-load
bits and/or external pin
SWM (single wire multiswitch) operation
and DiSEqC™ tone output
A
B
C
D
Channel 1 of 2 channels shown.
R8-C11 network is needed only when high
inductive load is applied, such as ProBrand LNB.
D3 and D4 are used for surge protection.
Either C12 or C9 should be used, but not both.
OUT
2
C™ -compatible interface: control (write)
within 19 to 21 VDC at 700 mA for
Dual LNB Supply and Control Voltage Regulator
V
V
S
DD
R1
Functional Block Diagram
R2
100
C1
220 nF
C3
R3
nF
VREG
2
SDA
SCL
C™ data
VIN
IRQ
100 F
C2
A8286
Regulator
Compatible
Interface
I
2
C
A
TDO1
Channel 1
Fault Monitor
DAC
OCP1
OCP2
PNG1
PNG2
TSD
VUV
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. The A8286 requires few external
components, with the boost switches 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 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.
Continued on the next page…
EXTM1
PAD
R4
Fsw
Converter
L1
33 H
Boost
LNB
Voltage
Control
R5
Fsw
Oscillator
LX1
GND
TCAP1
100 F
C5
GNDLX1
D1
TGate1
Divider
EXTM1
Clock
Shape
Wave
C6
1 F
22 kHz
TMode1
1 H
L3
BOOST1
Linear
Stage
TDO1
VCP1
Tone
Detect
Charge
VPump
Pump
C 4
100 nF
LNB1
TCAP1
TDI1
D2
C7
10 nF
100
R7
220 nF
C8
C10
10 nF
R8
30
C11
0.68 F
B
220 H
R6
15
C12
L2
220 nF
D
C9
D
A8286
C13
10 nF
V
D4
C
D3
OUT1
C

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A8286SETTR-TB Summary of contents

Page 1

Dual LNB Supply and Control Voltage Regulator Features and Benefits 2 ▪ 2-wire serial I C™ -compatible interface: control (write) and status (read) ▪ LNB voltages (16 programmable levels) compatible with all common standards ▪ Tracking switch-mode power converter for ...

Page 2

... Additional information is available on the Allegro website. Ordering Information Use the following complete part numbers when ordering: Part Number 7-in. reel, 1500 pieces/reel A8286SETTR carrier tape a Contact Allegro for additional packing options. b Leadframe plating 100% matte tin. The device uses a 2-wire bidirectional serial interface, compatible ...

Page 3

A8286 Dual LNB Supply and Control Voltage Regulator Terminal List Table Name Number GND – ADD 11 BOOST1 1 BOOST2 21 EXTM1 6 EXTM2 16 GND 8 PAD Pad GNDLX1 27 GNDLX2 23 IRQ 14 LNB1 28 LNB2 22 LX1 ...

Page 4

A8286 Dual LNB Supply and Control Voltage Regulator ELECTRICAL CHARACTERISTICS Characteristics General Set-Point Accuracy, Load and Line Regulation Supply Current Boost Switch On Resistance Switching Frequency Switch Current Limit Linear Regulator Voltage Drop TCAP Pin Current Output Voltage Rise Time ...

Page 5

A8286 Dual LNB Supply and Control Voltage Regulator ELECTRICAL CHARACTERISTICS (continued) Characteristics Tone Tone Frequency Tone Amplitude, Peak-to-Peak Tone Duty Cycle Tone Rise Time Tone Fall Time EXTM Logic Input EXTM Input Leakage Tone Detector Tone Detect Input Amplitude Receive, ...

Page 6

A8286 Dual LNB Supply and Control Voltage Regulator ELECTRICAL CHARACTERISTICS (continued) Characteristics I 2 C™ Address Setting ADD Voltage for Address 0001,000 ADD Voltage for Address 0001,001 ADD Voltage for Address 0001,010 ADD Voltage for Address 0001,011 1 Operation at ...

Page 7

A8286 Dual LNB Supply and Control Voltage Regulator Protection The A8286 has a wide range of protection features and fault diag- nostics which are detailed in the Status Register section. Boost Converter/Linear Regulator Each channel contains a tracking current-mode boost ...

Page 8

A8286 Dual LNB Supply and Control Voltage Regulator ODT (Overcurrent Disable Time) This function should be enabled at all times. If the ODT function is enabled and the LNB output current exceeds 900 mA, typical, for more than 48 ms, ...

Page 9

A8286 Dual LNB Supply and Control Voltage Regulator Tone Generation The A8286 solution offers four options for tone generation, providing maximum flexibility to cover every application. The EXTM pins (external modulation), in conjunction with the I control bits: TMODE (tone ...

Page 10

A8286 Dual LNB Supply and Control Voltage Regulator A8286 always responds by resetting the data transfer sequence. The Read/Write bit is used to determine the data transfer direc- tion. If the Read/Write bit is high, the master reads the contents ...

Page 11

A8286 Dual LNB Supply and Control Voltage Regulator Interrupt Request The A8286 also provides an interrupt request pin, IRQ, which is an open-drain, active-low output. This output may be connected to a common IRQ line with a suitable external pull-up ...

Page 12

A8286 Dual LNB Supply and Control Voltage Regulator Control Registers (I 2 C™-Compatible Write Register) All main functions of the A8286 are controlled through the 2 I C™-compatible interface via the 8-bit Control registers. As the A8286 contains numerous control ...

Page 13

A8286 Dual LNB Supply and Control Voltage Regulator Table 3. Control Registers with Address (I1, I0 and 11 Channel 1 Bit (Address Bit 0 TMODEx ToneMode. ...

Page 14

A8286 Dual LNB Supply and Control Voltage Regulator Table 4. Output Voltage Amplitude Selection VSEL VSEL VSEL ...

Page 15

A8286 Dual LNB Supply and Control Voltage Regulator Status Registers (I 2 C™-Compatible Read Register) The main fault conditions: overcurrent (OCP, with overcurrent disable timer, ODT enabled), under voltage (VUV) and overtem- perature (TSD), are all indicated by setting the ...

Page 16

A8286 Dual LNB Supply and Control Voltage Regulator Table 6. Status Register 1 Bit Bit 0 DIS1 LNB Output Disabled. DIS is used to indicate the current condition of the LNB output for channel 1. At power-on ...

Page 17

A8286 Dual LNB Supply and Control Voltage Regulator Table 7. Status Register 2 Bit Bit 0 CAD1 Cable between LNB and the LNB head is disconnected. When cable disconnect test mode is applied, the LNB linear regulator is disabled and ...

Page 18

A8286 Dual LNB Supply and Control Voltage Regulator Table 8. Component Selection Table Component C3 220 nF C8 C12 220 nF X5R or X7R, 0805 C1, C4 100 nF X5R ...

Page 19

A8286 Dual LNB Supply and Control Voltage Regulator Preliminary dimensions, for reference only (reference JEDEC MO-220VHHD) Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case ...

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