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Número de pieza | APR34150 | |
Descripción | SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER | |
Fabricantes | Diodes | |
Logotipo | ||
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No Preview Available ! APR34150
SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER
Description
APR34150 is a secondary side Combo IC, which combines an N-
Channel MOSFET and a driver circuit designed for synchronous
rectification (SR) in DCM operation.
The N-Channel MOSFET has been optimized for low gate charge,
low RDS(ON), fast switching speed and body diode reverse recovery
performance.
The synchronous rectification can effectively reduce the secondary
side rectifier power dissipation and provide high performance solution.
By sensing MOSFET drain-to-source voltage, APR34150 can output
ideal drive signal with less external components. It can provide high
performance solution for 5V output voltage application.
The APR34150 is available in SO-8 package.
Pin Assignments
(Top View)
DRISR 1
VDET 2
AREF 3
VCC 4
SO-8
8 DRAIN
7 DRAIN
6 GND
5 GND
Features
•
•
•
•
Synchronous Rectification for DCM Operation Flyback
Eliminate Resonant Ring Interference
Fast Detector of Supply Voltages
Fewest External Components
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3
•
and Other Portable Apparatus
Standby and Auxiliary Power Supplies
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
C23 R21
C21 C22
++
R23
APR34150
DRAIN
GND
DRAIN
GND
VDET
VCC
DRISR
AREF
RAREF
R24
C24
CAREF
APR34150
Document number: DS37985 Rev. 2 - 2
1 of 10
www.diodes.com
October 2015
© Diodes Incorporated
1 page Electrical Characteristics (@TA =+25°C, unless otherwise specified. Cont.)
MOSFET Static Characteristics
Parameters
Drain to Source Breakdown
Voltage
Gate Threshold Voltage
Zero Gate Voltage Drain
Current
Gate to Source Leakage
Current
Drain to Source On-state
Resistance
Symbol
VDSS(BR)
VGS(TH)
IDSS
IGSS
RDS(ON)
Conditions
VGS=0V, ID=0.25mA
VDS=VGS, ID=0.25mA
VDS=50V, VGS=0V
VGS=10V, VDS=0V
VGS=4.5V, ID=15A
Min
50
0.5
–
–
12
MOSFET Dynamic Characteristics
Parameters
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
Gate to Source Charge
Gate to Drain Charge (Miller
Charger)
Total Gate Charge
Gate Resistance
Symbol
Ciss
Coss
Crss
Qgs
Qgd
Qg
Rg
Conditions
VGS=0V, VDS=25V, f=1MHz
VGS=0V to 10V, VDD=25V,
ID=15A
–
Min
–
–
–
–
–
–
–
Typ
–
0.9
–
–
17
Typ
1316
97
85
3.2
5.7
15.2
0.85
APR34150
Max
–
2
1
±10
30
Unit
V
V
μA
μA
mΩ
Max
–
–
–
–
–
–
–
Unit
pF
nC
Ω
Operation Description
MOSFET Driver
The operation of the SR is described with timing diagram shown in Figure 1. APR34150 monitors the MOSFET drain-source voltage. When the
drain voltage is lower than the turn-on threshold voltage VTHON, the IC outputs a positive drive voltage after a turn-on delay time (tDON). The
MOSFET will turn on and the current will transfer from the body diode into the MOSFET’s channel.
In the process of drain current decreasing linearly toward zero, the drain-source voltage rises synchronically. When it rises over the turn off
threshold voltage VTHOFF, APR34150 pulls the drive signal down after a turn off delay (tDOFF).
I,V
VDET
IS
VTHON
0
VTHOFF
t
APR34150
Document number: DS37985 Rev. 2 - 2
VDRISR
0.9VDRISR
0.9VDRISR
0
tDON
0.1VDRISR
tRG
tDOFF
0.1VDRISR
tFG t
Figure 1. Typical Waveforms of APR34150
5 of 10
www.diodes.com
October 2015
© Diodes Incorporated
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet APR34150.PDF ] |
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