Fremont Micro Devices
Preliminary FT839NX/839MX
High Efficiency Off-Line CC/CV Switch
FEATURES
DESCRIPTION
The FT839NX/FT839MX controller device is
optimized for high-performance, low power
switching mode power supply applications. The
FT839NX/FT839MX facilitates CC/CV charger
design by eliminating an opto-coupler and TL431.
Voltage Lockout (UVLO), Leading Edge Blanking
(LEB) and built-in cable compensation offer the
users a high efficiency and low cost solution for
Its highly integrated functions such as Under
Constant-Current (CC) and
Constant-Voltage (CV) with Primary Side
Control
Proprietary technology enabling high
efficiency and fast dynamic response
Satisfy DoE Level 6 requirements from
5V/1A to 5V/2.4A applications
No audible noise over entire operating
range
Optimization for capacitive loading
Built-in power NPN/MOS
Built-in Cable Compensation
Built-in Line Compensation
Primary-side feedback eliminates
opto-coupler and TL431
Cycle-by-Cycle Current Limiting
Over Temperature Protection
CV Open-loop Protection
performance
VCC Over Voltage Protection
Power supplies built with FT839NX/FT839MX
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fid
respectively.
Furthermore,
SOP8 package.
Confidential Rev0.90
can achieve both highest average efficiency，
fast dynamic load response and super low
standby power. FT839NX and FT839MX satisfy
DoE Level 6 requirements with production
margin from 5V/1A to 5V/2.4A applications,
en
AC/DC power applications.
C
Excellent capacitive loading start-up
fruitful protections like Open Circuit Protection
and Over Temperature Protection to eliminate
the external protection circuits and provide
reliable operations. FT839NX is available in
SOP8/DIP8 package. FT839MX is available in
TYPICAL APPLICATION
Adapter/Charger for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
Standby and Auxiliary Power Supplies
Adapter for ADSL / WiFi Wireless
AC/DC LED Driver applications
Set Top Boxes (STB)
FM
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features
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TYPICAL APPLICATION CIRCUIT
Preliminary FT839NX/839MX
on
+
VCC
D
Figure 1.1: FT839NX Typical Application Circuit
fid
CS
GND
Confidential Rev0.90
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AC
INPUT
C
D
FM
+
FT839MX
FB
Figure 1.2: FT839MX Typical Application Circuit
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Fremont Micro Devices
Preliminary FT839NX/839MX
ABSOLUTE MAXIMUM RATINGS
FB to GND………………………………...…………………………………….…….…….….... -0.3V to +7V
CS to GND…………………………………………...…………………………………….…….....-0.3V to +7V
VCC to GND…………………………………..………….………………………………………-0.3V to +30V
C to GND…………………………………...…………………………….……….…………......-0.3V to +700V
D to GND…………………………………...…………………………….……….…………......-0.3V to +650V
Operating Temperature Range……………………...………………………………………...-40℃ to +125℃
Junction Temperature………………………………..…………………………………….... -40℃ to +150℃
Storage Temperature Range ……………………………..………………………………….-60℃ to +150℃
ESD Protection MM………………..……………………………………………………………………….200V
*Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress
implied. Extended exposure to stresses above the Recommended Operating Conditions may
affect device reliability
.
FM
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ESD Protection HBM……………….....………………………………………………………………….2000V
Fremont Micro Devices
PIN CONFIGURATION
Preliminary FT839NX/839MX
Figure 2: Pin Assignments
TERMINAL DEFINITION
Pin
1
2
3
4
5
6
7
8
Name
CS
FB
GND
VCC
NC
C or D
Primary current sense
Output voltage feedback pin
Ground.
Supply voltage
No connection
Description
C: the Collector of the power NPN for FT839NX; D: the Drain of the power MOS for
FT839MX. This pin is connected to the primary lead of the transformer
Table 1
FM
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ORDERING INFORMATION
Preliminary FT839NX/839MX
FT839X X X X - XX
Circuit Type
M: MOS
N: NPN
Internal MOS/NPN Type
A or B or D
Package
Blank: SOP8
D: DIP8
HSF and Packaging
RB: RoHS and Tube
RT: RoHS and T&R
GB: Green and Tube
GT: Green and T&R
0: 0%
1: 3%
2: 6%
3: 9%
FT839NX
①
/FT839MX
①
Device
FT839NA①
FT839NB①
FT839ND①
FT839NDD①
FT839MB①
①
DESIGNATOR
SYMBOL
0
1
2
3
fid
Table 2
Confidential Rev0.90
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Figure 3: Marking Rule
C
MARKING RULE
FM
①:
Represents Version (0, 1, 2 or 3)
②③④⑤⑥⑦
: for internal reference
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Options
Cable Comp = 0%
Cable Comp = 3%
Cable Comp = 6%
Cable Comp = 9%
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Cable Comp
