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A8285 Datasheet(PDF) 2 Page - Allegro MicroSystems

Part # A8285
Description  LNB Supply and Control Voltage Regulator
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8285 Datasheet(HTML) 2 Page - Allegro MicroSystems

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Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
A8285/A8287
LNB Supply and Control Voltage Regulator
Functional Block Diagram
22 kHz Tone
Detector
Internal
Regulator
Boost Converter
Charge
Pump
Clock
Divider
22 kHz
Tone
Generator
I C Interface
2
Output
Voltage
Select
Fault Monitor
Overcurrent
TSD
Undervoltage
VREG
BOOST
Feedback
33 µH
33 µF
EXTM
V IN
SDA
SCL
ADD
IRQ
100 mV
VIN
LX
100 nF
VCP
BOOST
OSC In
DISABLE
100 nF
LNB
220
Ω
6.8 nF
33 µH
220 nF
1.5 µF
TCAP
TOUT
TDI
10 nF
VDD
TDO
VDD
OSC
Overcurrent
VPUMP
220 nF
Overcurrent
15
Ω
100 µF
100 nF
C10
C1
L1
D1
C5
C2
C4
C3
R3 R4 R5
R6
C9
R2
C8
D2
C6
C7
L2
R1
Tracking
Regulator
GM
ID
Characteristics
Suggested Manufacturer
C1
33 μF, 25 V, esr < 200 mΩ, I
ripple > 350 mA
Nichicon, part number UHC1E330MET
C2, C5,C10
100 nF, 50 V, X5R or X7R
C4
100 μF, 35 V, esr < 75 mΩ, I
ripple> 800 mA
Nichicon, part number UHC1V101MPT
C3,C6
220 nF, 50 V, X5R or X7R
C7
1.5 μF, 50 V, X5R or X7R
C8
6.8 nF, 50 V; Y5V, X5R, or X7R
C9
10 nF (maximum), 50 V; Y5V, X5R, or X7R
R1
15
Ω, 1%, c W
R2
220
Ω, 1%, 2 W
R3-R6
Value determined by V
DD, bus capacitance. etc.
L1
33 μH, I
DC > 1.3 A
TDK, part number TSL0808-330K1R4
L2
33 μH, I
DC > 0.5 A
TDK, part number TSL0808-330K1R4
D1
1 A, 35 V or 40 V, Schottky diode
Various, part number 1N5819; Sanken, part number AW04
D2
1 A, 100 V, 1N4002
Tone detector and leads TDI and TDO are not provided in 16-pin package (A8285).


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