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부품번호 | MP8125 기능 |
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기능 | LNB Power Supply and Control Voltage Regulator | ||
제조업체 | MPS | ||
로고 | |||
전체 13 페이지수
The Future of Analog IC Technology
MP8125
550mA, 8-14V Input, LNB Power Supply
and Control Voltage Regulator
DESCRIPTION
The MP8125 is a voltage regulator designed to
provide efficient, low noise power to the
Satellite receiver’s RF LNB (Low Noise Block)
converter via coaxial cable through a DiSEqC
1.x compatible link that receives instructions
from a dedicated controller.
The MP8125 integrates a current mode boost
regulator followed by a tracking linear regulator.
The boost regulator provides a clean and quiet
power source that will not contaminate the low
noise RF signal down converted to the receiver.
The tracking linear regulator protects the output
against overload or short.
The MP8125 provides a number of features
described in the European EUTELSAT
specification (DiSEqC) including: voltage
selection of horizontal or vertical polarization
directions of LNB and a selectable VOUT
compensation for voltage drop on the long
coaxial cable. In accordance with DiSEqC
standard, a tone signal of 22kHz is generated
by an internal oscillator and can be activated or
deactivated onto output by EXTM pin.
The MP8125 is available in thermally enhanced
TSSOP16 and 24-pin QFN (4 x 4mm) packages.
TYPICAL APPLICATION
FEATURES
• DiSEqC 1.x Compatibility
• Up to 550mA Output Current
• 8V to 14V Input Voltage
• Boost Converter with Internal Switch
• Low Noise LDO Output
• Built-in 22kHz Tone Signal Generator
• Programmable Current Limit
• 1V Line Drop Compensation
• Adjustable Soft-start Time
• POK Indicator
• Short Circuit Protection
• Over Temperature Protection
• TSSOP16 Exposed Pad and 24-pin QFN (4
x 4mm) Packages
APPLICATIONS
• LNB Power Supply and Control for Satellite
Set Top Boxes
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
MP8125 Rev. 1.1
10/11/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheet4u.net/
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol Condition
TONE Signal
Tone Signal Frequency
EXTM Input Logic Threshold
fTONE
VEXTM_High
VEXTM_Low
TA = 25°C
VEXTM rising
VEXTM falling
Delay Time of Tone Signal
Activated or Deactivated (5)
tDELAY
Delay time after EXTM goes
high or low
Peak-to-Peak Amplitude
Rise and Fall Time
Over-Current Protection
Output Current Limit
Dynamic Overload
Protection Off Time
Dynamic Overload
Protection On Time
VPP ILOAD = 0 to 100mA
RL=1kΩ, CL=0.1μF
ILIMIT
TOFF
TON
RLIMIT=10kΩ
Time of attempt to restart
Time to onset of shutdown
POK
POK Upper Trip Threshold
(5)
VFB with Respect to Nominal
Min
20
0.8
0.55
600
Typ
22
1.5
fTONE
0.65
8
850
2
50
12
Max Units
24 kHz
2V
V
0.9
1100
V
μs
mA
s
ms
%
POK Lower Trip Threshold
POK Output Lower Voltage
VFB with Respect to Nominal
ISINK = 5mA
-12 %
0.3 V
Thermal Protection
Over Temperature
Shutdown (5)
150 °C
OTP Hysteresis
20 °C
Note:
5) Guaranteed by design.
6) Shall withstand the back voltage for an indefinite period of time. On removal of the fault condition the device returns to normal operation
MP8125 Rev. 1.1
10/11/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
4
Free Datasheet http://www.datasheet4u.net/
4페이지 MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the DESIGN EXAMPLE section.
VIN =12V, VLINEDROP=5V, VEXTM=0V, IOUT=0.55A, TA = +25ºC, unless otherwise noted.
MP8125 Rev. 1.1
10/11/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
7
Free Datasheet http://www.datasheet4u.net/
7페이지 | |||
구 성 | 총 13 페이지수 | ||
다운로드 | [ MP8125.PDF 데이터시트 ] |
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