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参数资料
| 型号： | A8291SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC VOLTAGE REG SGL LNB 28-QFN |
| 标准包装： | 9,000 |
| 应用： | 转换器，模拟和数字式卫星信号接收器 |
| 输入电压： | 8 V ~ 16 V |
| 输出数： | 1 |
| 输出电压： | 12.7 V ~ 20.4 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN/MLP 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
A8291
Single LNB Supply and Control Voltage Regulator
Features and Benefits
? 2-wire serial I 2 C? -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
? Provides up to 500 mA load current
? Static current limit circuit allows full current at startup and
13 → 18 V output transition; reliably starts wide load range
? Push-pull output stage minimizes 13 → 18 V and 18 → 13 V
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 I 2 C? data
bits and/or external pin
? Filter bypass MOSFET minimizes losses during tone transmit
? 22 kHz tone detector facilitates DiSEqC? 2.0 decoding
? Auxiliary modulation input
? LNB overcurrent with timer
? Diagnostics for output voltage level, input supply UVLO,
and DiSEqC? tone output
? Cable disconnect diagnostic
Package:
28 pin 5 mm × 5mm
MLP/QFN (suffix ET)
Description
Intended for analog and digital satellite receivers, this single
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 an LNB down
converter via coaxial cable. The A8291 requires few external
components, with the boost switch 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 levels of component
integration ensure extremely low noise and ripple figures.
The A8291 has been designed for high efficiency, utilizing
the Allegro ? advanced BCD process. The integrated boost
switch has been optimized to minimize both switching and
static losses. To further enhance efficiency, the voltage drop
across the tracking regulator has been minimized.
The A8291 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
Continued on the next page…
Functional Block Diagram
V S
L1
33 μ H
D1
L3
1 H
C1
100 nF
C2
100 μ F
VIN
LX
C5
100 μ F
GNDLX
C6
1 μ F
BOOST VCP
C4
100 nF
V DD
VREG
C3
220 nF
Regulator
Boost
Converter
Charge BFC
Pump
VPump
D2
B
R10
1
C12
B
C
D5
B
R1 R2 R3 R4 R5 R6
fsw
EXTM
TMode
BFO
BFI
R7
15
EXTM
BFC
DAC
LNB
Voltage
Control
Wave
Shape
Linear
Stage
LNB
L2
220 μ H
V OUT
C9
220 nF
TDO
SDA
SCL
ADD
I 2 C?-
Compatible
Interface
Fault Monitor
OCP
PNG
TSD
VUV
TCAP
fsw
Oscillator
TGate
Clock
Divider 22 kHz
C8
D3 220 nF
TCAP
C7
22 nF
R9
30
C11
0.68 μ F
A
C13
10 nF
A
B
D4
B
C
R9-C11 network is needed only when a highly
inductive load is applied, such as ProBand LNB.
D2, D4, D5, and R10 are used for surge protection.
IRQ
PAD
GND
TDO
Tone
Detect
TDI
R8
100
C10
10 nF
C
Either C12 or C9 should be used, but not both.
8291-DS, Rev. 14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8291SETTR-TB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8292 | 制造商:AMPEX 功能描述: |
| A8292SETTR-T | 功能描述:IC REG LNB SUPPLY/CONTROL 28-MLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| A8293 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8293SESTR-T | 功能描述:IC REG LNB BOOST/LINEAR 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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