Fremont Micro Devices
Preliminary FT8260/1/2x
PSR Single-Stage AC-DC LED Driver with High PF
FEATURES
Primary side control without secondary
feedback circuit
Single-stage active PFC for high power factor
and low THD
High current accuracy ±3%
Three-level ON/Off Dimming (FT8261x)
Ultra-low start up current
Cycle-by-cycle current limit
Over-voltage protection
Short-circuit protection
Over temperature protection
Under voltage lockout protection
significantly simplifies the LED lighting system
design by eliminating the secondary side feedback
components and the opto-coupler.
No Dimming (FT8260/2x)
DESCRIPTION
The
FT8260/1/2x
is
a
single
stage
primary-side-control offline LED controller with high
power factor, low THD and excellent current
accuracy for isolated LED lighting applications.
The extremely low start-up current and quiescent
current
of
FT8260/1/2x
reduce
the
power
consumption, resulting in excellent efficiency.
APPLICATIONS
AC/DC LED driver applications
Signal and decorative LED light
T8/T10 LED String
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The
functions
Confidential Rev0.86
The multi-protection function of the FT8260/1/2x
greatly enhances the system reliability and safety.
FT8260/1/2x
such
features
as
fruitful
protection
protection,
over-voltage
E14/E27/PAR30/PAR38/GU10 LED lamp
FM
© 2014 Fremont Micro Devices Inc.
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short-circuit protection, cycle-by-cycle current limit,
over-temperature protection, VCC UVLO protection.
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The accurate current control from the primary side
DS8260/1x-A0-page1
Fremont Micro Devices
Preliminary FT8260/1/2x
TYPICAL APPLICATION CIRCUIT
F1
V AC
85V— 265V
R sn
C sn
D f
N p
N s
C o1
C o2
LE D +
EM I
B1
C 1
R 1
D sn
Ra
D a
R2
R d
(F T 8 2 6 1 x )
C 2
U 1
N vcc
R
L
FT8260/1B/0DD
4
7
8
1
6
Rs
3
C4
R3
2
C 3
5
CY
F1
en
C sn
Df
Np
Ns
Co1
N vcc
Q1
R4
Rs
CY
C sn
D f
N p
N s
D sn
N vcc
VAC
85V— 265V
R sn
EMI
B1
C1
R1
D sn
R2
Rd
(F T 8 2 6 1 )
C2
FT8260/1
C4
on
R3
C3
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Da
U1
Ra
5
6
4
1
3
2
F1
D
C
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Co2
C o1
C o2
C Y
V A C
85V — 265V
R sn
C 1
R 1
E M I
B 1
FM
R a
D a
R 2
R d
(F T 8 2 6 1 )
C 2
U 1
l
LE D -
LED+
LED-
LE D +
R
L
7 ,8
FT8261/2DD
5
6
4
R s
3
C 4
R 3
2
1
C 3
LE D -
Figure 1: Typical Application Circuit
© 2014 Fremont Micro Devices Inc.
Confidential Rev0.86
DS8260/1/2x-A0-page2
Fremont Micro Devices
Preliminary FT8260/1/2x
ABSOLUTE MAXIMUM RATINGS
VCC to GND………………………………………………………………………………………………-0.3V to +25V
Analog Inputs and Outputs……………………………………………………………………….……….. -0.3V to 6V
D to GND…………………………………………………………………………………………………-0.3V to 650V
Operating Temperature Range………………………………………………………………………-40
℃
to +125
℃
Junction Temperature…………………………………………………………………………...........-40
℃
to +150
℃
Storage Temperature Range ………………………………………………………………………-55
℃
to +150
℃
ESD Protection HBM………………………………………………………………………………………….….2000V
ESD Protection MM……………………………………………………………………………... ………......….. 200V
FM
© 2014 Fremont Micro Devices Inc.
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DS8260/1/2x-A0-page3
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Stresses exceed those listed under “Absolute Maximum Ratings” may cause permanent damage
to the device. Functional operation of the device at conditions beyond those listed in the
specification is not guaranteed. Prolonged exposure to extreme conditions may affect device
reliability or functionality.
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Fremont Micro Devices
Preliminary FT8260/1/2x
PIN CONFIGURATION
Top View
COMP
1
GND
2
CS
3
6
5
4
Top View
ZCD
VCC
GD
CS
1
COMP
2
ZCD
3
VCC
4
8
7
6
5
Top View
D
D
GND
GND
GND
1
COMP
2
ZCD
3
CS
4
8
7
6
5
VCC
VCC
D
D
Figure 2.1: FT8260/1
Figure 2.2: FT8260/1B/0DD
Figure 2.3: FT8261/2DD
No.
1
2
3
4
5
PIN
COMP
GND
CS
GD
VCC
control loop
Ground
FUNCTION
Gate drive output pin. Clamped to 13V to avoid excessive gate drive voltage
Power supply
Zero current detection pin. A negative edge triggers the turn on signal of the
external MOSFET. Connecting this pin through a resistor divider from the auxiliary
6
ZCD
winding to GND. Over-voltage condition is detected through ZCD. If ZCD voltage is
higher than the over-voltage protection (OVP) threshold after a blanking time of
1
2
CS
FM
COMP
3
ZCD
4
5,6
7,8
VCC
GND
D
© 2014 Fremont Micro Devices Inc.
D
No.
PIN
C
1us, the over-voltage condition is detected
Table1.1 FT8260/1 terminal description
FUNCTION
Current sense pin. This pin connects a current sense resistor to GND
Internal EA’s output. This pin connects a capacitor to ground to stabilize the current
control loop
Zero current detection pin. A negative edge triggers the turn on signal of the
internal MOSFET. Connecting this pin through a resistor divider from the auxiliary
winding to GND. Over-voltage condition is detected through ZCD. If ZCD voltage is
higher than the over-voltage protection (OVP) threshold after a blanking time of
1us, the over-voltage condition is detected
Power supply
Ground
Internal power MOSFET drain
Table1.2 FT8260/1B/0DD terminal description
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Confidential Rev0.86
Current sense pin. This pin connects a current sense resistor to GND
en
Internal EA’s output. This pin connects a capacitor to ground to stabilize the current
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TERMINAL DESCRIPTION
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DS8260/1/2x-A0-page4
Fremont Micro Devices
No.
1
2
PIN
GND
COMP
Ground
FUNCTION
Preliminary FT8260/1/2x
Internal EA’s output. This pin connects a capacitor to ground to stabilize the current
control loop
Zero current detection pin. A negative edge triggers the turn on signal of the
internal MOSFET. Connecting this pin through a resistor divider from the auxiliary
3
ZCD
winding to GND. Over-voltage condition is detected through ZCD. If ZCD voltage is
higher than the over-voltage protection (OVP) threshold after a blanking time of
1us, the over-voltage condition is detected
4
5,6
7,8
CS
D
VCC
Current sense pin. This pin connects a current sense resistor to GND
Internal power MOSFET drain
Table1.3 FT8261/2DD terminal description
Power supply
ORDERING INFORMATION
Circuit Type
8260: No Dimming
8261: On/Off Dimming
on
FT8260/1/2 x - x x x
C
D
FM
Circuit Type
8260/2: No Dimming
8261: On/Off Dimming
Internal MOS Type
B or DD
© 2014 Fremont Micro Devices Inc.
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FT8260/1 x - x x
Confidential Rev0.86
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HSF and Packaging
RT: RoHS and T&R
GT: Green and T&R
Package
Blank: SOT23-6
HSF and Packaging
RB: RoHS and Tube
RT: RoHS and T&R
GB: Green and Tube
GT: Green and T&R
Package
Blank: SOP8
D: DIP8
DS8260/1/2x-A0-page5
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