N3856V Rectification Controller Datasheet

N3856V Datasheet, PDF, Equivalent


Part Number

N3856V

Description

Synchronous Rectification Controller

Manufacture

NIKO-SEM

Total Page 13 Pages
Datasheet
Download N3856V Datasheet


N3856V
NIKO-SEM Synchronous Rectification Controller N3856V
N3856P
GENERAL DESCRIPTION
The N3856 is a low cost , high efficiency, full
featured ,synchronous re ctification control ler
that specifically des igned for the synchronous
rectification applications of the Flyback AC/DC
PWM mode switching power supply .
The N3856 is included a totem pole output
ideally suited for driving a synchronous rectifi-
cation power MOSFET . 2 way of the current
detect provided for wide applications by any
continuous or disco tinuous mode operating
(patent pending).In cont inuous mode operatin-
g, it included a timi ng control to adjust
maximum turn-on duty to allow the designer to
determine the optimal condition for the best
efficiency by the external resistor and
capacitor. In disconti nuous mode operating, it
included a very sensitive current
detector
(about 20mV) to cont rol the synchronous
rectification MOSFET, avoid happening a large
reverse current via the synchronous
rectification MOSFET to damage the device.
FEATURES
High efficiency operating.
Adjustable Max. duty cycle designed.
Decrease areas of heatsink or PCB.
Solved heat dissipation.
Sensitive current detecter(about 20mV)
Suited for continuous and discontinuous
mode operation.
Auto frequency tracking with PWM
frequency.
Suited for fixed or variable frequency
SOIC-8 and DIP-8 package.
APPLICATION
Flyback AC/DC power supply
DEVICE SELECTION GUIDE
DIP- 8
N3856PG
SOIC- 8
N3856VG
ABSOLUTE MAXIMUM RATING
PARAMETERS SYMBOL
Vcc to GND
Surge Voltage of VCC(below 200nS)
Drain to Other Pin
Power Dissipation at Ta = 25 ,Derate 8mW/ for Ta
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
25
VCC
VCC(surge)
PD
Tj
TSTG
TLEAD
REV : 1.1
1
LIMITS
-0.3 to 30
45
180
725
-40 to +150
-65 to +150
300
UNITS
V
Vp-p
V
mW
DEC-14-2004
http://www.Datasheet4U.com

N3856V
NIKO-SEM Synchronous Rectification Controller N3856V
N3856P
ELECTRICAL CHARACTERISTICS (TC = 25 °C)
PARAMETER
TEST CONDITIONS
Supply Voltage
Supply Current
GATE Sink Current
GATE Source Current
Rise Time
Fall Time
Delay Time
Max Duty Cycle
Vcc
CL= 1.0nF
CL= 1.0nF
LIMITS
MIN TYP
7 12
- 4.5 -
1
1
40
40
200
90 95
MAX
30
300
UNIT
V
mA
A
A
nS
nS
nS
%
BLOCK DIAGRAM
VCC
PGND
D
10K
RT/CT
DRAIN
OSC
1/3 VCC
COMP.
BUFFER
DRIVER
20mV
ADJ.
SLOPE CURRENT DETECTER
GND
Aout
GATE
BIAS
REV : 1.1
2 DEC-14-2004


Features NIKO-SEM Synchronous Rectification Cont roller N3856V N3856P GENERAL DESCRIPT ION The N3856 is a low cost , high effi ciency, full featured ,synchronous re c tification control ler that specificall y des igned for the synchronous rectifi cation applications of the Flyback AC/D C PWM mode switching power supply . The N3856 is included a totem pole output ideally suited for driving a synchronou s rectification power MOSFET . 2 way of the current detect provided for wide a pplications by any continuous or disco tinuous mode operating (patent pending) .In cont inuous mode operating, it incl uded a timi ng control to adjust maximu m turn-on duty to allow the designer to determine the optimal condition for th e best efficiency by the external resis tor and capacitor. In disconti nuous mo de operating, it included a very sensit ive current detector (about 20mV) to co nt rol the synchronous rectification MO SFET, avoid happening a large reverse c urrent via the synchronous rectification MOSFET to damage the d.
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