A8287 데이터 시트보기 (PDF) - Allegro MicroSystems
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A8287 Datasheet PDF : 17 Pages
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A8285/A8287
LNB Supply and Control Voltage Regulator
V IN C10
100 nF
Functional Block Diagram
C1
L1
D1
C5
33 µF
33 µH
100 nF
C2
C4
100 nF 100 µF
VREG
C3 220 nF
EXTM
R3 R4 R5
VDD
SDA
SCL
ADD
IRQ
VIN
Internal
Regulator
BOOST
Feedback
OSC In
Boost Converter
LX
VCP
Charge
Pump
VPUMP
Overcurrent
BOOST
OSC
Clock
Divider
22 kHz
Tone
Generator
I 2C Interface
Output
Voltage
Select
Fault Monitor
Overcurrent
TSD
Undervoltage
Overcurrent
100 mV
DISABLE
Tracking
Regulator
GM
22 kHz Tone
Detector
R1
15 Ω
LNB
D2
L2
33 µH
1.5 µF
C7
220 nF
C6
TCAP
6.8 nF
C8
TOUT
220 Ω R2
10 nF
TDI
C9
TDO
R6 VDD
Tone detector and leads TDI and TDO are not provided in 16-pin package (A8285).
ID
Characteristics
Suggested Manufacturer
C1
C2, C5,C10
33 μF, 25 V, esr < 200 mΩ, Iripple > 350 mA
100 nF, 50 V, X5R or X7R
Nichicon, part number UHC1E330MET
C4
C3,C6
100 μF, 35 V, esr < 75 mΩ, Iripple> 800 mA
220 nF, 50 V, X5R or X7R
Nichicon, part number UHC1V101MPT
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
L1
L2
D1
Value determined by VDD, bus capacitance. etc.
33 μH, IDC > 1.3 A
33 μH, IDC > 0.5 A
1 A, 35 V or 40 V, Schottky diode
TDK, part number TSL0808-330K1R4
TDK, part number TSL0808-330K1R4
Various, part number 1N5819; Sanken, part number AW04
D2
1 A, 100 V, 1N4002
2
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Worcester, Massachusetts 01615-0036 (508) 853-5000
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