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PDF N3856V Data sheet ( Hoja de datos )

Número de pieza N3856V
Descripción Synchronous Rectification Controller
Fabricantes NIKO-SEM 
Logotipo NIKO-SEM Logotipo



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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

1 page




N3856V pdf
NIKO-SEM Synchronous Rectification Controller N3856V
N3856P
VCC
+
C5
R10
D3
+
C6
T1
1
4
PWM
CONTROLER
Q2
R9
D1
1N4148
5
6
8
D2 SB3100
SD
Q1
G
C2
470P
R1
16K
U1
1 GATE VCC 8
RT
2 PGND RT/CT 7 51K
3 GND AOUT 6
4 BIAS DRAIN 5
N3856V
+ C3
CT
470P
Vo
U3
4 PC817
3
R7
1
2 R6
U2
TL431
R8
R4
C4
R5
a. RT,CT is requested for determining the turn
on duty in continuous mode applications.
b. RT,CT are removed and pin7 of U1
connects to pin3 of U1 if make sure
power is aways working in discontinuous
mode .
Schematic 1 Non-synchronous signal type with AUX winding application
Schematic 1 is a non-synchronous signal ty pe with AUX winding application , the AUX
winding is designed to provide the supply vo ltage about 10V ~15V , the supply voltage
via the diode D1 to VCC of the U1 without any capacitor .
In the continous mode, to change the values of the external resistor RT and capacitor
CT that can set the fixed maximum turn- on duty for the synchronous rectification
MOSFET.
In the discontinous mode , current detect pin 5 can sense the voltage drop of the
MOSFET , if it is under 20mV ,this IC will turn off the MOSFET .
REV : 1.1
5 DEC-14-2004

5 Page





N3856V arduino
NIKO-SEM Synchronous Rectification Controller N3856V
N3856P
SOIC-8 (D) MECHANICAL DATA
Dimension
A
B
C
D 0.38
E
F
G 0.1
mm
Min. Typ.
4.8 4.9 5.0
3.8 3.9 4.0
5.8 6.0 6.2
0.445
1.27
1.35 1.55 1.75
0.175
Max.
0.51
0.25
Dimension
H
I
J
K
L
M
N
mm
Min. Typ.
0.5 0.715
0.18
0.254
0.22
0° 4°
Max.
0.83
0.25
8°
REV : 1.1
11 DEC-14-2004

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