A8286 Datasheet

IC型號(hào)：
A8286
PDF描述：
Dual LNB Supply and Control Voltage Regulator
文件大小：
412.50KB
PDF頁(yè)數(shù)：
19頁(yè)
芯片廠家：
ALLEGRO

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A8286

Dual LNB Supply and Control Voltage Regulator

Features and Benefits

C鈩?/div>

鈻?/div>

2-wire serial

-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 per channel and 1.0 A total

continuous load current

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Provides up to 700 mA per channel and 1.1 A total for 2000 ms

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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?8 V output transition; reliably starts wide load range

鈻?/div>

Push-pull output stage minimizes 13鈫?8 V and 18鈫?3 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

C鈩?data

bits and/or external pin

鈻?/div>

22 kHz tone detector facilitates DiSEqC鈩?2.0 decoding

鈻?/div>

Auxiliary modulation input

鈻?/div>

LNB overcurrent with timer

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>

Cable disconnect diagnostic

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廬 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.

Continued on the next page鈥?/div>

Package:

28 pin 5 mm 脳 5mm

QFN/MLP (suffix ET)

Functional Block Diagram

100 F

Channel 1

33 H

1 H

1 F

100 F

100 nF

BOOST1

VCP1

TDO1 EXTM1

LX1

GNDLX1

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.

A8286

Charge

Pump

VIN

100 nF

VREG

220 nF

DAC

SDA

SCL

Compatible

Interface

Fault Monitor

OCP1

OCP2

PNG1

PNG2

TSD

VUV

Fsw

TCAP1

Clock

Divider 22 kHz

Oscillator

TDO1

Tone

Detect

TDI1

10 nF

Boost

Converter

Regulator

Fsw

LNB

Voltage

Control

C12

TMode1

EXTM1

VPump

LNB1

D2 220 nF

C11

0.68 F

Wave

Shape

TCAP1

TGate1

Linear

Stage

OUT1

220 H

220 nF

C13

10 nF

IRQ

100

C10

10 nF

PAD

GND

8286-DS, Rev. 3

型號(hào)

版本

描述

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