DataSheet39.com

What is AN6-206?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "Primary-Side Synchronous Rectifier (SR) Trigger Solution".


AN6-206 Datasheet PDF - Fairchild Semiconductor

Part Number AN6-206
Description Primary-Side Synchronous Rectifier (SR) Trigger Solution
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 


There is a preview and AN6-206 download ( pdf file ) link at the bottom of this page.





Total 9 Pages



Preview 1 page

No Preview Available ! AN6-206 datasheet, circuit

www.fairchildsemi.com
AN-6206
Primary-Side Synchronous Rectifier (SR) Trigger Solution
for Dual-Forward Converter
Introduction
In any switching converter, rectifier diodes are used to
obtain DC output voltage. The conduction loss of diode
rectifier contributes significantly to the overall power losses
in a power supply; especially in low output voltage
applications, such as personal computer (PC) power
supplies. The conduction loss of a rectifier is proportional to
the product of its forward-voltage drop and the forward
conduction current. Using synchronous rectification (SR)
where the rectifier diode is replaced by MOSFET with
proper on resistance (RdsON), the forward-voltage drop of a
synchronous rectifier can be lower than that of a diode
rectifier and, consequently, the rectifier conduction loss can
be reduced.
The highly integrated FAN6210 is a primary-side SR
controller for dual-forward converter that provides control
signals for the secondary-side SR driver FAN6206.
FAN6210 also provides drive signal for the primary-side
power switches by using an output signal from the PWM
controller. FAN6210 can be combined with any PWM
controller that can drive a dual-forward converter. To obtain
optimal timing for the SR drive signals, transformer winding
voltage is also monitored. To improve light-load efficiency,
green-mode operation is employed, which disables the SR
turn-on trigger signal, minimizing gate drive power
consumption at light-load condition.
This application note describes the design procedure of SR
circuit using FAN6210 and FAN6206. The guidelines for
printed circuit board (PCB) layout and a design example
with experiment results are also presented.
Vin
Vac PFC stage
Cbulk
Drv n:1
R8
D1
PWM control signal
(From PWM controller)
R1
FAN6210
1 XP GND 8
2 XN SOUT 7
3 SIN VDD 6
4 RDLY DET 5
C1
D5 D3 R3
D6 D4 R4
R2
Drv
D2
From power supply
of PWM controller
R5
PT
Q1 R9
R6 R7
FAN6206
1 LPC1GATE1 8
2 LPC2 GND 7
3 SN GATE2 6
4 SP VDD 5
Figure 1. Typical Application
Lo
Q2
C2
Vo
© 2010 Fairchild Semiconductor Corporation
Rev. 1.0.0 • 4/27/10
www.fairchildsemi.com
Free Datasheet http://www.Datasheet4U.com

line_dark_gray
AN6-206 equivalent
AN-6206
Printed Circuit Board Layout
In Figure 12, the power traces are marked as bold lines.
Good PCB layout improves power system efficiency,
minimizes excessive EMI, and prevents the power supply
from being disrupted during surge/ESD tests.
Guidelines
ƒ For PC power applications, the PFC/PWM combination
controller is usually separated from main board and is
applied at a daughter board. FAN6210 is also
recommended to be placed on the same daughter board.
As indicated by 1 and 2, FAN6210 control circuits’
ground should be connected together and to the GND
pin of FAN6210 first, then the GND pin to ground of
PFC/PWM combination controller.
ƒ As indicated by 3 and 4, PFC/PWM combination
controller’s ground and PWM MOSFETs’ ground are
connected to the negative terminal of Cbulk. Keep trace 4
short, direct, and wide.
ƒ A Y-cap between the primary and secondary is
necessary for PC power applications. As indicated by 5
and 6, the Y-cap is suggested on the low-side, where it
is between the negative terminal of Cbulk and case.
Connecting trace 6 directly to case is helpful to surge
immunity. According to the safety requirements, the
creepage between the two pointed ends should be at
least 5mm. The Y-cap should be far away from PT.
APPLICATION NOTE
ƒ As indicated by 8, FAN6206 control circuits’ ground
should be connected together, then to the GND pin of
FAN6206.
ƒ As indicated by 9, the GND pin of FAN6206 should
be connected to the source of Q1 and Q2 separately.
Keeping trace 9 short and direct can maintain the
ground level between MOSFET and GND pin closed.
Thus, the SR control signal can be kept away from
error triggering.
ƒ As indicated by 10, the source terminals of Q1 and Q2
are connected to the negative terminal of Co. Keep
trace 10 short, direct, and wide.
ƒ As indicated by 11, Vo is connected to the supervisor
IC. As indicated by 12, the power supply source of
FAN6206’s VDD pin is connected to the detection
terminal of supervisor IC. Trace 11 should be long
and far away from Vo terminal. It’s helpful to prevent
LPC mechanism from output current interference.
ƒ As indicated by 7, the negative terminal of Co is
connected to case directly.
© 2010 Fairchild Semiconductor Corporation
Rev. 1.0.0 • 4/27/10
Figure 12. Layout Considerations
5
www.fairchildsemi.com
Free Datasheet http://www.Datasheet4U.com


line_dark_gray

Preview 5 Page


Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AN6-206 electronic component.


Information Total 9 Pages
Link URL [ Copy URL to Clipboard ]
Download [ AN6-206.PDF Datasheet ]

Share Link :

Electronic Components Distributor


An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists.


SparkFun Electronics Allied Electronics DigiKey Electronics Arrow Electronics
Mouser Electronics Adafruit Newark Chip One Stop


Featured Datasheets

Part NumberDescriptionMFRS
AN6-206The function is Primary-Side Synchronous Rectifier (SR) Trigger Solution. Fairchild SemiconductorFairchild Semiconductor

Semiconductors commonly used in industry:

1N4148   |   BAW56   |   1N5400   |   NE555   |  

LM324   |   BC327   |   IRF840  |   2N3904   |  



Quick jump to:

AN6-     1N4     2N2     2SA     2SC     74H     BC     HCF     IRF     KA    

LA     LM     MC     NE     ST     STK     TDA     TL     UA    



Privacy Policy   |    Contact Us     |    New    |    Search