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PDF HF81 Data sheet ( Hoja de datos )
| Número de pieza | HF81 | |
| Descripción | X Capacitor Bleeder | |
| Fabricantes | MPS | |
| Logotipo |  |
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HF81
The Future of Analog IC Technology
DESCRIPTION
HF81 is a n innovative two-terminal IC that
automatically discharges an X cap acitor while
eliminating power losses and allowing power
supplies to comply with safety standards.
The HF81 acts as a smart high-voltage switch
when placed in series with dischar ge resistors
(alternatively bleed resistors). In th e presence
of an AC vo ltage, the H F81 blocks current flow
in the safety discharge resistor s to reduce the
power loss in these components to zero at 230
VAC. When disconnected from the AC voltage,
the HF81 automatically and safely discharges
the X capa citor by closing the cir cuit through
the bleed r esistors a nd directing the energy
away from the exposed AC plug.
Table 1: Component Selection Table
PN
X Total Series Power
Capacitance Resistance Saving(1)
HF81
≤500nF 1.5M
750nF 1M
1μF 780
1.5μF 480
2μF 360
Ω
Ω 66mW
kΩ 86mW
kΩ 142m
W
kΩ 191m
W
2.5μF 300
kΩ 230m
W
3.5μF 200
5μF 150
kΩ 347m
kΩ 464m
W
W
Notes:
1) The values are calculated at Vin=265Vac
TYPICAL APPLICATION
X Capacitor Bleeder
FEATURES
Disconnect series discharge resistors from
L-N when AC voltage is applied
Connect series discharge resistors with L-N
to discharge the X capacitor when AC
voltage is unplugged
Supplied by AC voltage directly and doesn’t
need external bias
Meets safety standards for use before or
after input fuse
No external ground pin leads to high
common mode surge immunity
1000V internal JFET inside leads to high
differential surge immunity
>4mm creepage on package and PCB
APPLICATIONS
AC/DC converters with X capacitors larger
than 0.1μF
All converters requiring ultra-low no-load
consumption and low standby power
Appliances requiring EuP Lot 6 compliance
Appliances requiring Energy Star V2.0
White Goods (For example, Dishwasher,
Washing Machine, Air-Conditioner and etc.)
Server Power, Telecom Power, ATX Power
All MPS parts are lead-free and adhere to the RoHS directive. 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.
HF81 Rev. 1.12
11/15/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
PIN FUNCTIONS
Package Pin #
1 NC
2
3
4 NC
5 NC
6
7
8 NC
Name
L1
L1
L2
L2
HF81 – X CAPACITOR BLEEDER
Description
Not Connected
AC Line 1
AC Line 1
Not Connected
Not Connected
AC Line 2
AC Line 2
Not Connected
HF81 Rev. 1.12
11/15/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet HF81.PDF ] | |
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