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Fairchild Semiconductor Electronic Components Datasheet

FAN6240M6X Datasheet

Secondary-Side Synchronous Rectifier Controller

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July 2016
FAN6240
Secondary-Side Synchronous Rectifier Controller for
Flyback Converters
Features
Works in Discontinuous Conduction Mode (DCM).
Adaptive Turn-off Trigger Blanking Time for easier
use
Turn-on Trigger Blanking Time (Minimum-OFF
Time) for Improved Noise Immunity
Supports High-Frequency Applications up to
200 kHz
Minimum Turn-on Delay (20 ns)
Adaptive Turn-off Threshold Control for Minimized
SR MOSFET Body Diode Conduction (Dead-Time
is independent of SR MOSFET)
Wide Voltage Range for LDO Input up to 30 V
Small Footprint: SOT-23 6 Pin Package
Description
The FAN6240M6X is a secondary-side synchronous
rectifier (SR) controller for an isolated flyback converter
operating in Discontinuous Conduction Mode (DCM).
The adaptive dead-time control algorithm minimizes the
body diode conduction of SR MOSFET while
guaranteeing stable and robust SR operation against
noise and disturbance caused by the circuit parasitic.
30 V rated input voltage LDO and Low VDD Under-
Voltage Lockout (UVLO) voltage allow FAN6240M6X to
be used for wide ranges of switched mode power supply
output voltage without additional circuit.
Applications
Battery Chargers for Smart Phones, Feature
Phones, and Tablet PCs
AC-DC Adapters for Portable Devices that Require
CV/CC Control
Ordering Information
Part Number
Operating
Temperature Range
FAN6240M6X
-40C to +125C
Package
6-Lead, SOT23, JEDEC MO-178 Variation AB,
1.6 mm Wide
Packing
Method
Tape & Reel
© 2016 Fairchild Semiconductor Corporation
FAN6240 • Rev. 1.0
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN6240M6X Datasheet

Secondary-Side Synchronous Rectifier Controller

No Preview Available !

Application Diagram
LCM
AC IN
F1
Fuse
U3
Photo
BR1
C1
C5
R11
L1
C2
R3
C3
R4
R1
D1
R2
R5
TX1
NP
NS
Q1
9 FB
1
HV Gate 4
8 IMIN
CS 3
U1
10 GNDFAN602VDD 5
FMAX
7
NC VS 6
2
C4
R6
R7
R8
D2
R9
NA
C9
R10
CY
R12
C6
Q2
R13
R14
11 GATE
DRAIN 6
22 GND U2 SOURCE 5
FAN6240M6X
33 VDD
VIN 4
Figure 1. Typical Application
Vo (+)
C7
R15
R16
R17
R18 C8
R19
GATE
Internal Block Diagram
DRAIN
SR_COND
Adaptive Dead
Time Control
Turn-on
Trigger
Blanking
+
VTH_ARM -
VTH_ON
-
210mV
+
TARM
Slope
Detection
SOURCE
SR_COND
VTH_OFF
+
10mV
-
Turn-off
Trigger
Blanking
VIN
VDD
+
LDO
-
VIN_ON / VIN_OFF
D Q SET
Turn-on
Q CLR
Turn-off
GATE
SR_COND
Minimum Turn
On Time
SKIP
GND
Figure 2. Function Block Diagram
© 2016 Fairchild Semiconductor Corporation
FAN6240 • Rev. 1.0
2
www.fairchildsemi.com


Part Number FAN6240M6X
Description Secondary-Side Synchronous Rectifier Controller
Maker Fairchild Semiconductor
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