FAIRCHILD FAN100

FAN100
Primary-Side-Control PWM Controller
Features
Description
ƒ
Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
ƒ
Accurate Constant Current Achieved by Fairchild’s
Proprietary TRUECURRENT™ Technique
ƒ
ƒ
Green Mode: Frequency Reduction at Light Load
The primary-side PWM controller FAN100 significantly
simplifies power supply design that requires CV and CC
regulation capabilities. The FAN100 controls the output
voltage and current precisely with the information in the
primary side of the power supply, not only removing the
output current sensing loss, but eliminating secondary
feedback circuitry.
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
Low Startup Current: 10μA Maximum
Fixed PWM Frequency at 42kHz with Frequency
Hopping to Reduce EMI
Low Operating Current: 3.5mA
The green-mode function with a low startup current
(10µA) maximizes the light-load efficiency so the power
supply can meet stringent standby power regulations.
Over-Temperature Protection with Auto-Restart
Compared with a conventional secondary-side
regulation approach, the FAN100 can reduce total cost,
component
count,
size,
and
weight;
while
simultaneously increasing efficiency, productivity, and
system reliability.
Brownout Protection with Auto-Restart
FAN100 controller is available in an 8-pin SOP package.
VDD Over-Voltage Protection with Auto-Restart
A typical output CV/CC characteristic envelope is shown
in Figure 1.
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 18V
SOP-8 Package
Applications
ƒ
Battery Chargers for Cellular Phones, Cordless
Phones, PDA, Digital Cameras, Power Tools
ƒ
ƒ
Replaces Linear Transformer and RCC SMPS
Offline High Brightness (HB) LED Drivers
Related Resources
ƒ
Figure 1. Typical Output V-I Characteristic
AN-6067 — Design Guide for FAN100/102 and
FSEZ1016A/1216
Ordering Information
Part Number
Operating
Temperature Range
FAN100MY
-40°C to +125°C
Eco Status
Green
Package
Packing Method
8-Lead, Small Outline
Package (SOP-8)
Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
FAN100 — Primary-Side-Control PWM Controller
June 2009
FAN100 — Primary-Side-Control PWM Controller
Application Diagram
Figure 2. Typical Application
Internal Block Diagram
+
VDD 7
OVP
VDD
Auto-Restart
Protection
28V
+
Internal Bias
Brownout
OTP
Soft-Driver
8
-
Gate
16V/5V
S
OSC with
Freq Hopping
Q
-
R Q
PWM
Comparator
1.3V
+
+
PWM
Comparator
-
Leading-Edge
Blanking
+
PWM
Comparator
1 CS
Slope Compensation
IO
Estimator
+
EA_V
GND
2.5V
2.5V
-
Green-Mode
Controller
+
EA_I
Brownout
Protection
tDIS
Detector
5
VS
Temp.
Compensation
6
VO
Estimator
3
4
COMI
2
COMV
GND
Figure 3. Functional Block Diagram
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
2
F- Fairchild logo
Z- Plant Code
X- 1-Digit Year Code
Y- 1-Digit Week Code
TT: 2-Digit Die Run Code
T: Package Type (M=SOP)
P: Z: Pb free, Y: Green Package
M: Manufacture Flow Code
ZXYTT
FAN100
TPM
Figure 4. Top Mark
Pin Configuration
GATE
CS
GND
VDD
COMI
GND
COMV
VS
FAN100 — Primary-Side-Control PWM Controller
Marking Information
Figure 5. Pin Configuration
Pin Definitions
Pin #
Name
Description
1
CS
2
GND
Ground.
3
COMI
Constant Current Loop Compensation. this pin connects a capacitor and a resistor between
COMI and GND for compensation current loop gain.
4
COMV
Constant Voltage Loop Compensation. this pin connects a capacitor and a resistor between
COMV and GND for compensation voltage loop gain.
5
VS
6
GND
Ground.
7
VDD
Supply. The power supply pin. IC operating current and MOSFET driving current are supplied
using this pin. This pin is connected to an external VDD capacitor of typically 10µF. The
threshold voltages for startup and turn-off are 16V and 5V, respectively. The operating current
is lower than 5mA.
8
GATE
PWM Signal Output. This pin outputs PWM signal and includes the internal totem-pole output
driver to drive the external power MOSFET. The clamped gate output voltage is 18V.
Current Sense. This pin connects a current-sense resistor to sense the MOSFET current for
peak-current-mode control in CV mode and provides for output-current regulation in CC mode.
Voltage Sense. This pin detects the output voltage information and discharge time based on
voltage of auxiliary winding. This pin connects two divider resistors and one capacitor.
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
VDD
Parameter
Min.
(1,2)
DC Supply Voltage
Max.
Unit
30
V
VVS
VS Pin Input Voltage
-0.3
7.0
V
VCS
CS Pin Input Voltage
-0.3
7.0
V
VCOMV
Voltage Error Amplifier Output Voltage
-0.3
7.0
V
VCOMI
Voltage Error Amplifier Output Voltage
-0.3
7.0
V
PD
Power Dissipation (TA＜50°C)
660
mW
ΘJA
Thermal Resistance (Junction-to-Air)
150
°C /W
ΘJC
Thermal Resistance (Junction-to-Case)
TJ
TSTG
TL
ESD
Operating Junction Temperature
Storage Temperature Range
-55
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Electrostatic Discharge Capability
39
°C /W
+150
°C
+150
°C
+260
°C
Human Body Model,
JEDEC: JESD22-A114
4.5
Charged Device Model,
JEDEC: JESD22-C101
2.0
FAN100 — Primary-Side-Control PWM Controller
Absolute Maximum Ratings
KV
Notes:
1. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
2. All voltage values, except differential voltages, are given with respect to GND pin.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
TA
Parameter
Conditions
Operating Ambient Temperature
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
Min.
-40
Typ.
Max.
Unit
+125
°C
www.fairchildsemi.com
4
VDD=15V and TA=-40°C~+125°C (TA=TJ), unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
25
V
VDD Section
VOP
Continuously Operating Voltage
VDD-ON
Turn-On Threshold Voltage
15
16
17
V
VDD-OFF
Turn-Off Threshold Voltage
4.5
5.0
5.5
V
IDD-OP
Operating Current
VDD=20V, fS=fOSC, VVS=2V,
VCS=3V, CL=1nF
3.5
5.0
mA
IDD-ST
Startup Current
0< VDD < VDD-ON-0.16V
3.7
10.0
μA
IDD-GREEN
Green Mode Operating Supply
Current
VDD=20V, VVS=2.7V,
fS=fOSC-N-MIN, VCS=0V,
CL=1nF, VCOMV=0V
1.0
2.5
mA
VDD-OVP
VDD Over-Voltage Protection Level
VCS=3V, VVS=2.3V
27
28
29
V
tD-VDDOVP
VDD Over-Voltage Protection
Debounce Time
fS=fOSC, VVS=2.3V
100
250
400
μs
Center
Frequency
TA=25°C
39.0
42.0
45.0
Frequency
Hopping Range
TA=25°C
±1.8
±2.6
±3.6
Oscillator Section
fOSC
tFHR
fOSC-N-MIN
Frequency
KHz
Frequency Hopping Period
TA=25°C
Minimum Frequency at No Load
fOSC-CM-MIN Minimum Frequency at CCM
FAN100 — Primary-Side-Control PWM Controller
Electrical Characteristics
3
ms
VVS=2.7V, VCOMV=0V
550
Hz
VVS=2.3V, VCS=0.5V
20
KHz
fDV
Frequency Variation vs. VDD
Deviation
fDT
Frequency Variation vs. Temperature
TA=-40°C to 125°C
Deviation
TA=25°C, VDD=10V to 25V
5
%
20
%
Voltage-Sense Section
IVS-UVP
Itc
VBIAS-COMV
Sink Current for Brownout Protection
RVS=20KΩ
IC Compensation Bias Current
Adaptive Bias Voltage Dominated by
VCOMV
VCOMV=0V, TA=25°C,
RVS=20KΩ
180
μA
9.5
μA
1.4
V
Current-Sense Section
tPD
Propagation Delay to GATE Output
100
200
ns
tMIN-N
Minimum On Time at No Load
VVS=-0.8V, RS=2KΩ,
VCOMV=1V
1100
ns
tMINCC
Minimum On Time in CC Mode
VVS=0V, VCOMV=2V
300
ns
1.3
V
VTH
Threshold Voltage for Current Limit
Continued on following page…
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
5
VDD=15V and TA=-40°C~+125°C (TA=TJ), unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
2.475
2.500
2.525
V
Voltage-Error-Amplifier Section
VVR
Reference Voltage
VN
Green Mode Starting Voltage on
COMV Pin
fS=fOSC-2KHz
VVS=2.3V
2.8
V
VG
Green Mode Ending Voltage on
COMV Pin
fS=1KHz
0.8
V
Output Sink Current
VVS=3V, VCOMV=2.5V
90
μA
Output Source Current
VVS=2V, VCOMV=2.5V
90
μA
Output High Voltage
VVS=2.3V
IV-SINK
IV-SOURCE
VV-HGH
4.5
V
Current-Error-Amplifier Section
VIR
Reference Voltage
II-SINK
Output Sink Current
VCS=3V, VCOMI=2.5V
55
μA
Output Source Current
VCS=0V, VCOMI=2.5V
55
μA
Output High Voltage
VCS=0V
II-SOURCE
VI-HGH
2.475
2.500
2.525
4.5
V
V
FAN100 — Primary-Side-Control PWM Controller
Electrical Characteristics (Continued)
Gate Section
DCYMAX
Maximum Duty Cycle
75
%
VOL
Output Voltage Low
VDD=20V, IO=10mA
VOH
Output Voltage High
VDD=8V, IO=1mA
5
V
VOH_MIN
Output Voltage High
VDD=5.5V, IO=1mA
4
V
tr
Rising Time
VDD=20V, CL=1nF
200
300
ns
tf
Falling Time
VDD=20V, CL=1nF
80
150
ns
Output Clamp Voltage
VDD=25V
15
18
V
VCLAMP
1.5
V
Over-Temperature-Protection Section
TOTP
Threshold Temperature for OTP
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
+140
o
C
www.fairchildsemi.com
6
5.5
16.6
5.3
VDD-OFF (V)
VDD-ON (V)
17
16.2
15.8
15.4
5.1
4.9
4.7
15
-40
-30
-15
0
25
50
75
85
100
4.5
125
-40
-30
-15
0
Temperature (ºC)
Figure 6. Turn-On Threshold Voltage (VDD-ON)
vs. Temperature
75
85
100
125
47
45
fOSC (KHz)
3.6
IDD-OP (mA)
50
Figure 7. Turn-Off Threshold Voltage (VDD-OFF)
vs. Temperature
4
3.2
2.8
2.4
43
41
39
37
2
-40
-30
-15
0
25
50
75
85
100
35
125
-40
-30
-15
Temperature (ºC)
0
25
50
75
85
100
125
Temperature (ºC)
Figure 8. Operating Current (IDD-OP)
vs. Temperature
Figure 9. Center Frequency (fOSC) vs. Temperature
2.525
2.525
2.515
2.515
2.505
2.505
VIR (V)
VVR (V)
25
Temperature (ºC)
FAN100 — Primary-Side-Control PWM Controller
Typical Performance Characteristics
2.495
2.485
2.495
2.485
2.475
-40
-30
-15
0
25
50
75
85
100
2.475
125
-40
Temperature (ºC)
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 10. Reference Voltage (VVR) vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
-30
Figure 11. Reference Voltage (VIR) vs. Temperature
www.fairchildsemi.com
7
23
600
22
fOSC-CM-MIN (KHz)
fOSC-N-MIN (Hz)
580
560
540
520
21
20
19
18
500
17
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
Temperature (ºC)
25
75
85
100
125
Figure 13. Minimum Frequency at CCM
(fOSC-CM-MIN) vs. Temperature
30
1250
25
1170
tMIN-N (ns)
20
15
10
1090
1010
930
5
0
850
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
0
Temperature (ºC)
25
50
75
85
100
125
Temperature (ºC)
Figure 15. Minimum On Time at No Load
(tMIN-N) vs. Temperature
Figure 14. Green Mode Frequency Decreasing Rate
(SG) vs. Temperature
3
1
2.5
0.8
VG (V)
2
VN (V)
50
Temperature (ºC)
Figure 12. Minimum Frequency at No Load
(fOSC-N-MIN) vs. Temperature
SG (kHz/V)
0
FAN100 — Primary-Side-Control PWM Controller
Typical Performance Characteristics
1.5
0.6
0.4
1
0.2
0.5
0
-40
-30
-15
0
25
50
75
85
100
0
125
-40
Temperature (ºC)
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 17. Green Mode Ending Voltage on COMV Pin
(VG) vs. Temperature
Figure 16. Green Mode Starting Voltage on COMV
Pin (VN) vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
-30
www.fairchildsemi.com
8
95
95
92
91
IV-SOURCE (µA)
IV-SINK (µA)
89
86
83
80
87
83
79
77
74
-40
-30
-15
0
25
50
75
85
100
75
125
-40
-30
-15
0
Temperature (ºC)
Figure 18. Output Sink Current (IV-SINK)
vs. Temperature
50
75
85
100
125
Figure 19. Output Source Current (IV-SOURCE)
vs. Temperature
60
60
58
58
II-SOURCE (µA)
II-SINK (µA)
25
Temperature (ºC)
56
54
52
FAN100 — Primary-Side-Control PWM Controller
Typical Performance Characteristics
56
54
52
50
-40
-30
-15
0
25
50
75
85
100
50
125
-40
Temperature (ºC)
-30
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 20. Output Sink Current (II-SINK)
vs. Temperature
Figure 21. Output Source Current (II-SOURCE)
vs. Temperature
80
DCYMAX (%)
76
72
68
64
60
-40
-30
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 22. Maximum Duty Cycle (DCYMAX)
vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
9
0 shows the basic circuit diagram of a primary-side
regulated flyback converter and its typical waveforms
are shown in 0. Generally, discontinuous conduction
mode (DCM) operation is preferred for primary-side
regulation since it allows better output regulation. The
operation principles of DCM flyback converter are as
follows:
Of the two error voltages, VCOMV and VCOMI, the smaller
determines the duty cycle. During constant voltage
regulation mode, VCOMV determines the duty cycle while
VCOMI is saturated to HIGH. During constant current
regulation mode, VCOMI determines the duty cycle while
VCOMV is saturated to HIGH.
During the MOSFET on time (tON), input voltage (VDL) is
applied across the primary side inductor (Lm). Then,
MOSFET current (Ids) increases linearly from zero to the
peak value (Ipk). During this time, the energy is drawn
from the input and stored in the inductor.
When the MOSFET is turned off, the energy stored in
the inductor forces the rectifier diode (D) to be turned
on. While the diode is conducting, the output voltage
(Vo), together with diode forward-voltage drop (VF), is
2
applied across the secondary-side inductor (Lm×Ns /
2
Np ) and the diode current (ID) decreases linearly from
the peak value (Ipk× Np/Ns) to zero. At the end of
inductor current discharge time (tDIS), all the energy
stored in the inductor has been delivered to the output.
When the diode current reaches zero, the transformer
auxiliary winding voltage (Vw) begins to oscillate by the
resonance between the primary-side inductor (Lm) and
the effective capacitor loaded across the MOSFET.
FAN100 — Primary-Side-Control PWM Controller
Functional Description
Figure 23. Simplified PSR Flyback Converter Circuit
During the inductor current discharge time, the sum of
output voltage and diode forward-voltage drop is
reflected to the auxiliary winding side as (Vo+VF)× Na/Ns.
Since the diode forward-voltage drop decreases as
current decreases, the auxiliary winding voltage reflects
the output voltage best at the end of diode conduction
time where the diode current diminishes to zero. Thus,
by sampling the winding voltage at the end of the diode
conduction time, the output voltage information can be
obtained. The internal error amplifier for output voltage
regulation (EA_V) compares the sampled voltage with
internal precise reference to generate error voltage
(VCOMV), which determines the duty cycle of the
MOSFET in CV mode.
I pk
I pk ⋅
NP
NS
I D .avg = I o
Meanwhile, the output current can be estimated using
the peak drain current and inductor current discharge
time since output current is the same as average of the
diode current in steady state.
VF ⋅
The output current estimator detects the peak value of
the drain current with a peak detection circuit and
calculates the output current using the inductor
discharge time (tDIS) and switching period (ts). This
output information is compared with the internal precise
reference to generate error voltage (VCOMI), which
determines the duty cycle of the MOSFET in CC mode.
With
Fairchild’s
innovative
technique,
TRUECURRENT™, constant current (CC) output can
be precisely controlled.
NA
NS
VO ⋅
NA
NS
Figure 24. Key Waveforms of DCM Flyback
Converter
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
10
Built-in temperature compensation provides constant
voltage regulation over a wide range of temperature
variation.
This
internal
compensation
current
compensates the forward-voltage drop variation of the
secondary side rectifier diode.
Green-Mode Operation
The FAN100 uses voltage regulation error amplifier
output (VCOMV) as an indicator of the output load and
modulates the PWM frequency as shown in Figure 25
such that the switching frequency decreases as load
decreases. In heavy-load conditions, the switching
frequency is fixed at 42KHz. Once VCOMV decreases
below 2.8V, the PWM frequency starts to linearly
decrease from 42KHz to 550Hz to reduce the switching
losses. As VCOMV decreases below 0.8V, the switching
frequency is fixed at 550Hz and FAN100 enters into
“deep green” mode, where the operating current reduces
to 1mA, reducing the standby power consumption.
Figure 26. Frequency Hopping
Startup
FAN100 — Primary-Side-Control PWM Controller
Temperature Compensation
Figure 27 shows the typical startup circuit and
transformer auxiliary winding for FAN100 application.
Before FAN100 begins switching, it consumes only
startup current (maximum 10μA) and the current
supplied through the startup resistor charges the VDD
capacitor (CDD). When VDD reaches turn-on voltage of
16V (VDD-ON), FAN100 begins switching, and the current
consumed increases to 3.5mA. Then, the power
required for FAN100 is supplied from the transformer
auxiliary winding. The large hysteresis of VDD provides
more hold-up time, which allows using small capacitor
for VDD.
Figure 25. Switching Frequency in Green Mode
Leading-Edge Blanking (LEB)
At the instant the MOSFET is turned on, a high-current
spike occurs through the MOSFET, caused by primaryside capacitance and secondary-side rectifier reverse
recovery. Excessive voltage across the RCS resistor can
lead to premature turn-off of the MOSFET. FAN100
employs an internal leading edge blanking (LEB) circuit
to inhibit the PWM comparator for a short time after the
MOSFET turns on. External RC filtering is not required.
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test equipment.
FAN100 has an internal frequency-hopping circuit that
changes the switching frequency between 39.4kHz and
44.6kHz with a period of 3ms, as shown in Figure 26.
Figure 27. Startup Circuit
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
11
VDD Over-Voltage Protection (OVP)
VDD over-voltage protection prevents damage from overvoltage conditions. If the VDD voltage exceeds 28V by
open-feedback condition, OVP is triggered. The OVP
has a debounce time (typical 250µs) to prevent false
triggering by switching noise. It also protects other
switching devices from over voltage.
The FAN100 has several self-protective functions, such
as Over-Voltage Protection (OVP), Over-Temperature
Protection (OTP), and brownout protection. All the
protections are implemented as auto-restart mode.
When auto-restart protection is triggered, switching is
terminated and the MOSFET remains off. This causes
VDD to fall. When VDD reaches the VDD turn-off voltage of
5V, the current consumed by FAN100 reduces to the
startup current (maximum 10µA) and the current
supplied startup resistor charges the VDD capacitor.
When VDD reaches the turn-on voltage of 16V, FAN100
resumes normal operation. In this manner, the autorestart alternately enables and disables the switching of
the MOSFET until the fault condition is eliminated (see
Figure 28).
VDS
Over-Temperature Protection (OTP)
The built-in temperature-sensing circuit shuts down
PWM output if the junction temperature exceeds 140°C.
Brownout Protection
FAN100 detects the line voltage using auxiliary winding
voltage since the auxiliary winding voltage reflects the
input voltage when the MOSFET is turned on. VS pin is
clamped at 1.15V while the MOSFET is turned on and
brownout protection is triggered if the current out of VS
pin is less than IVS-UVP (typical 180μA) during the
MOSFET conduction.
Fault
Occurs
Power
On
Fault Removed
Pulse-by-pulse Current Limit
When the sensing voltage across the current sense
resistor exceeds the internal threshold of 1.3V, the
MOSFET is turned off for the remainder of the switching
cycle. In normal operation, the pulse-by-pulse current
limit is not triggered since the peak current is limited by
the control loop.
VDD
FAN100 — Primary-Side-Control PWM Controller
Protections
16V
5V
Operating Current
3.5mA
10µA
Normal
Operation
Fault
Situation
Normal
Operation
Figure 28. Auto-Restart Operation
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
12
FAN100 — Primary-Side-Control PWM Controller
Typical Application Circuit (Primary-Side Regulated Offline LED Driver)
Application
Fairchild Devices
Input Voltage Range
Output
Offline LED Driver
FAN100
90~265VAC
24V/0.35A (8.4W)
Features
ƒ
ƒ
High Efficiency (>77% at Full Load)
Tight Output Regulation (CC:±5%)
34
32
30
28
AC90V
AC120V
AC230V
AC264V
26
24
Output Voltage (V)
22
20
18
16
14
12
10
8
6
4
2
0
0
50
100
150
200
250
300
350
400
Output current (mA)
Figure 29. Measured Efficiency and Output Regulation
Figure 30. Typical Application Circuit Schematic
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
13
FAN100 — Primary-Side-Control PWM Controller
Typical Application Circuit (Continued)
Transformer Specification
ƒ
ƒ
Core: EFD-20
Bobbin: EFD-20
Pin
Specification
Remark
Primary-Side Inductance
3－4
1.08mH ± 5%
100kHz, 1V
Primary-Side Effective Leakage
3－4
35μH ± 5%.
Short one of the secondary windings
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
14
5.00
4.80
A
0.65
3.81
8
5
B
6.20
5.80
PIN ONE
INDICATOR
1.75
4.00
3.80
1
5.60
4
1.27
(0.33)
0.25
M
1.27
C B A
LAND PATTERN RECOMMENDATION
0.25
0.10
SEE DETAIL A
1.75 MAX
R0.10
0.25
0.19
C
0.10
0.51
0.33
0.50 x 45°
0.25
C
OPTION A - BEVEL EDGE
GAGE PLANE
R0.10
8°
0°
0.90
0.406
FAN100 — Primary-Side-Control PWM Controller
Physical Dimensions
OPTION B - NO BEVEL EDGE
0.36
NOTES: UNLESS OTHERWISE SPECIFIED
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012, VARIATION AA, ISSUE C,
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
E) DRAWING FILENAME: M08AREV13
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
Figure 31. 8-Lead, Small Outline Package (SOP-8)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
15
FAN100 — Primary-Side-Control PWM Controller
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com
16