D ts e t
aa h e
R c e t r lc r nc
o h se Ee to is
Ma u a t r dCo o e t
n fc u e
mp n n s
R c e tr b a d d c mp n ns ae
o h se rn e
o oet r
ma ua trd u ig ete dewaes
n fcue sn i r i/ fr
h
p rh s d f m te oiia s p l r
uc a e r
o h r n l u pi s
g
e
o R c e tr waes rce td f m
r o h se
fr e rae r
o
te oiia I. Al rce t n ae
h
r nl P
g
l e rai s r
o
d n wi tea p o a o teOC
o e t h p rv l f h
h
M.
P r aetse u igoiia fcoy
at r e td sn r n la tr
s
g
ts p o rmso R c e tr e eo e
e t rga
r o h se d v lp d
ts s lt n t g aa te p o u t
e t oui s o u rne
o
rd c
me t o e c e teOC d t s e t
es r x e d h
M aa h e.
Qu l yOv riw
ai
t
e ve
• IO- 0 1
S 90
•A 92 cr ct n
S 1 0 et ai
i
o
• Qu l e Ma ua trr Ls (
ai d
n fcues it QML MI- R -
) LP F
385
53
•C a sQ Mitr
ls
lay
i
•C a sVS a eL v l
ls
p c ee
• Qu l e S p l r Ls o D sr uos( L )
ai d u pi s it f it b tr QS D
e
i
•R c e trsacic l u pir oD A a d
o h se i
r ia s p l t L n
t
e
me t aln u t a dD A sa d r s
es lid sr n L tn ad .
y
R c e tr lcrnc , L i c mmi e t
o h se Ee t is L C s o
o
tdo
t
s p ligp o u t ta s t f c so r x e t-
u pyn rd cs h t ai y u tme e p ca
s
t n fr u lya daee u loto eoiial
i s o q ai n r q a t h s r n l
o
t
g
y
s p l db id sr ma ua trr.
u pi
e yn ut
y n fcues
T eoiia ma ua trr d ts e t c o a yn ti d c me t e e t tep r r n e
h r n l n fcue’ aa h e a c mp n ig hs o u n r cs h ef ma c
g
s
o
a ds e ic t n o teR c e tr n fcue v rino ti d vc . o h se Ee t n
n p c ai s f h o h se ma ua trd eso f hs e ie R c e tr lcr -
o
o
isg aa te tep r r n eo i s mio d co p o u t t teoiia OE s e ic -
c u rne s h ef ma c ft e c n u tr rd cs o h r n l M p c a
o
s
g
t n .T pc lv le aefr eee c p r o e o l. eti mii m o ma i m rt g
i s ‘y ia’ au s r o rfrn e up s s ny C r n nmu
o
a
r xmu ai s
n
ma b b s do p o u t h rceiain d sg , i lt n o s mpetsig
y e a e n rd c c aa tr t , e in smuai , r a l e t .
z o
o
n
© 2 1 R cetr l t n s LC Al i t R sre 0 1 2 1
0 3 ohs E cr i , L . lRg s eevd 7 1 0 3
e e oc
h
T l r m r, l s v iw wrcl . m
o e n oe p ae it w . e c o
a
e
s
o ec
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPS™)
March 2006
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ
Fairchild Power Switch (FPS™)
Features
Current Mode PWM Control with a Fixed Operating Fre-
quency (300kHz)
Pulse by Pulse Current Limit
Over Load Protection
Over Voltage Protection
Thermal Shutdown
Line Under Voltage Detection and Sleep on/off Function
Internal High Voltage SenseFET (200V)
Supports Forward or Flyback Topology
Description
The FS6X-Series is specially designed for off-line DC-DC con-
verters with minimal external components. This device com-
bines a current mode PWM controller with a high voltage power
SenseFET in a single package. The PWM controller includes
integrated fixed frequency oscillator, line under voltage lockout,
sleep on/off function, thermal shutdown protection, over voltage
protection, pulse-by-pulse current limit, and temperature com-
pensated precise current sources for a loop compensation.
Compared with the discrete MOSFET and PWM controller solu-
tion, the FS6X-Series can reduce total cost, component count,
size, and weight, while simultaneously increasing efficiency,
productivity, and system reliability.
Applications
DC-DC Converter
PoE Device
OUTPUT POWER TABLE
(1)
PRODUCT
FS6X0420RJ
FS6X0720RJ
FS6X1220RJ
36V
DC
~72V
DC
14W
26W
36W
Related Application Notes
AN4137
- Design Guidelines for Off-line Flyback Converters
Using Fairchild Power Switch (FPS)
AN4140
- Transformer Design Consideration for Off-line Fly-
back Converters using Fairchild Power Switch
AN4141
- Troubleshooting and Design Tips for Fairchild
Power Switch Flyback Applications
AN4148
- Audible Noise Reduction Techniques for FPS
Applications
Table 1. Maximum Output Power
Note:
1. Maximum practical continuous power in an open
frame design at 50°C ambient.
Ordering Information
Part Number
FS6X0420RJ
FS6X0720RJ
FS6X1220RJ
FS6X0420RJX
FS6X0720RJX
FS6X1220RJX
(2)
Operating Temp.
Range
-25°C to +85°C
-25°C to +85°C
-25°C to +85°C
-25°C to +85°C
-25°C to +85°C
-25°C to +85°C
Pb-Free
Yes
Yes
Yes
Yes
Yes
Yes
Package
D2-Pak-6L
D2-Pak-6L
D2-Pak-6L
D2-Pak-6L
D2-Pak-6L
D2-Pak-6L
Packing Method
Tube
Tube
Tube
Tape & Reel
Tape & Reel
Tape & Reel
Marking
Code
6X0420R
6X0720R
6X1220R
6X0420R
6X0720R
6X1220R
Note:
2. X : Tape & Reel
FPS
TM
is a trademark of Fairchild Semiconductor Corporation
©2006 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Rev. 1.0.1
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPS™)
Typical Application Diagram
DC
IN
Drain
DC
OUT
PWM
L/S
Vfb
Vcc
GND
Figure 1. Typical Flyback Application
Internal Block Diagram
V
CC
3
V
LU
Line
UVLO
V
CC
Good
9V/15V
Enable
V
SL
V
CC
I
delay
FB 4
R
V
SD
V
CC
S
Q
Drain
1
Line
Sense
6
Vref
Internal
Bias
V
ref
I
FB
28R
OSC
S
Q
R
Q
Gate
Driver
V
OVP
TSD
Line UVLO
5
N.C
V
CC
Good
R
Q
2 GND
Figure 2. Functional Block Diagram of FS6X-Series
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Rev. 1.0.1
2
www.fairchildsemi.com
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPS™)
Pin Assignments
D2-PAK-6L
6. Line Sense
5. N.C.
4. Vfb
3. Vcc
2. GND
1. Drain
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin Number
1
2
3
Pin Name
Drain
GND
Vcc
Pin Function Description
This pin is the high voltage power SenseFET drain connection.
This pin is the control ground and the SenseFET source.
This pin is the positive supply input. This pin provides internal operating current for both
start-up and steady-state operation.
This pin is internally connected to the inverting input of the PWM comparator. The collec-
tor of an opto-coupler is typically tied to this pin. For stable operation, a capacitor should
be placed between this pin and GND. If the voltage of this pin reaches 7.5V, the over load
protection is activated resulting in shutdown of the IC.
This pin is not connected.
According to the voltage of this pin, three operation modes are defined: normal operation
mode, line under voltage lock out mode, and sleep mode. If the voltage of this pin is
smaller than 2.55V, the IC goes into the line under voltage lock out, stopping switching
operation. If the voltage of this pin is smaller than 1.8V, the IC enters into sleep mode.
During sleep mode, reference voltage generation circuit including the shunt regulator is
disabled and only 300uA operation current is required.
4
5
Feedback
(FB)
N.C.
6
Line Sense (LS)
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Rev. 1.0.1
3
www.fairchildsemi.com
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPS™)
Absolute Maximum Ratings
(Ta=25°C, unless otherwise specified
.
)
Parameter
Drain-source Voltage
Pulsed Drain Current (Tc=25°C)
(1)
I
DM
Symbol
V
DSS
FS6X0420RJ
FS6X0720RJ
FS6X1220RJ
FS6X0420RJ
Value
200
10.2
16.2
23.7
3.4
5.4
12.4
2.1
3.4
7.9
35
-0.3 to V
CC
43
54
125
Internally limited
-25 to +85
-55 to +150
Unit
V
A
A (rms)
Continuous Drain Current (Tc=25°C)
I
D
FS6X0720RJ
FS6X1220RJ
FS6X0420RJ
A (rms)
Continuous Drain Current (Tc=100°C)
Supply Voltage
Input Voltage Range
Total Power Dissipation (Tc=25°C)
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
I
D
FS6X0720RJ
FS6X1220RJ
V
CC
V
FB
FS6X0420RJ
V
V
W
P
D
T
j
FS6X0720RJ
FS6X1220RJ
T
A
T
STG
°C
°C
°C
Note:
1. Repetitive rating: Pulse width limited by maximum junction temperature.
Thermal Impedance
Parameter
Junction-to-Ambient Thermal
Junction-to-Case Thermal
(1)
θ
JC
Symbol
θ
JA
FS6X0420RJ
FS6X0720RJ
FS6X1220RJ
Value
-
2.9
2.3
1.0
Unit
°C/W
°C/W
Note:
1. Infinite cooling condition - Refer to the SEMI G30-88.
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Rev. 1.0.1
4
www.fairchildsemi.com
京公网安备 11010802033920号
EEWORLD
