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PDF MP6922A Data sheet ( Hoja de datos )
| Número de pieza | MP6922A | |
| Descripción | Dual Fast-Turn-off Intelligent Rectifier | |
| Fabricantes | MPS | |
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MP6922A
Dual, Fast-Turn–Off, Intelligent Rectifier
The Future of Analog IC Technology
DESCRIPTION
The MP6922A is a dual, fast-turn–o ff, intelligent
rectifier for synchronous rectif ication in LLC
resonant converters.
The IC drives two N-channel MOSFETs and
regulates th eir forward voltage drop to about
30mV and turns it off before the switchin g
current goes negative.
MP6922A h as a light-lo ad function to latch off
the gate driver under light-load co nditions, thus
limiting the current to below 600μA.
The MP6922A’s fast turn-off enables bot h
continuous-conduction mode an
d
discontinuous-conduction mode. An internal
reverse-current protection function ensures safe
MOSFET operation under high-frequency
continuous-current conditions.
MP6922A requires a minimal number of readily-
available st andard external components and is
available in SOIC8 E, SOIC8, and SOIC14
packages.
FEATURES
Works with Both Standard and Logic-Level
MOSFETs
Compatible with Energy Star’s 0.5W
Standby Requirements
V DD Range from 8V to 24V
Fast Turn-Off Total Delay of 20ns
Reverse-Current–Protection Function
Maximum Switching Frequency of 300kHz
<600 μA Quiescent Current in Light-Load
Mode
Supports CCM, CrCM and DCM Operation
Available in SOIC8E, SOIC8, and SOIC14
packages
APPLICATIONS
AC-DC Adapters
LCDs & PDP TVs
Telecom SMPS
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
SOIC8
MP6922A Rev. 1.02
www.MonolithicPower.com
11/30/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP6922A—DUAL, FAST-TURN–OFF, INTELLIGENT RECTIFIER
ELECTRICAL CHARACTERISTICS (continued)
VDD = 12V, -40°C ≤TJ≤ 125°C, unless otherwise noted.
Parameter
Turn-Off Total Delay
Pull-Down Impedance
Pull-Down Current
Symbol Conditions
τDoff
VD1,2= V
RGATE=0Ω
VD1,2= V
RGATE=0Ω
SS, C
SS, C
LOAD=5nF,
LOAD=10nF,
3V <VG1,2<10V
Min
50
50
Typ
1
3
Max Units
75 ns
75 ns
2Ω
A
MP6922A Rev. 1.02
www.MonolithicPower.com
11/30/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
5 Page 
MP6922A—DUAL, FAST-TURN–OFF, INTELLIGENT RECTIFIER
Figure 4 shows the MP6922A operating at light-
load. The lo w current prevents the driver voltag e
from saturating but decreases when t
he
synchronous power switch turns on and adjusts
VDS.
Vds
0mV
-30mV
Isd
Vgs
Figure 3: Synchronous Rectification
Operation at Heavy Load
Vds
0mV
-30mV
Isd
Vgs
Figure 4: Synchronous Rectification
Operation at Light Load
Light-Load Latch-Off Function
The gate driver of MP6922A is latched to limit
driver losses under light-load condition to
improve light-load efficiency.
Normal Operation Latch Off
When the MOSFET’s switching-cycle conductin g
period falls below 2.2 μs ( τLL), the MP6922 A
enters light -load mode and latches off th
e
MOSFET a fter a 160 μs delay (lig ht-load-enter
delay, τLL-Delay)
After entering light-loa d mode, the MP6922 A
monitors the MOSFET’ s body diode conductin g
period by sensing V DS (when V DS exceeds –
300mV (V LL-DS), MP6922A tre ats the t he
MOSFET’s body-diode conducting period as
finished). If the MOSFET’s body diode
conducting period exceeds 2.4μs (τLL+τLL-H), light-
load mode ends and th e MOSFET unlatche s t o
restart the synchronous rectification.
For the SOIC14 packag e. the MP6922A has a n
LL pin that allows τLL to be adjusted by an
external resistor:
LL
2.2s
RLL
100k
Latch Off during Burst Operation
The IC also monitors the synchronous MOSFET
OFF period. If the OFF period exceeds the light -
load–enter OFF period width (
τLL-OFF), the
MP6922A e nters light-lo ad mode an d latches of f
the gate driver.
The gate d river is unlatched whe n the drain -
source voltage of the synchronous MOSFET VDS
drops below –30mV.
Reverse Current–Protection Function
When the LLC system operates in CCM at a very
high freque ncy, the synchronous current may
reverse before the IC turns off th e gate driver,
which can lead to shoot-through (in center-
tapped outputs with full-wave rectifica tion
topologies). The MP6 922A has a protection
function to latch off th e gate driver when th e
current reverses before the driver signal is pulle d
low.
When the synchronous current reverses, the hig h
spike can b e observed between the MOSF ET’s
drain/source. The MP6922A monitors the voltag e
through the RCP pin using a voltage divider.
When the voltage of RCP pin exceeds V RCP,
MP6922A l atches the driver sig nal of bot h
channels f or ~150 μs ( τRCP) to protect t he
synchronous MOSFET . At the end of
τRCP,
MP6922A restarts the synchronous rectificat ion.
MP6922A Rev. 1.02
www.MonolithicPower.com
11/30/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MP6922A.PDF ] | |
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