FAIRCHILD FSEZ1016A

FSEZ1016A
Primary-Side-Regulation PWM Integrated Power MOSFET
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
This primary-side PWM integrated power MOSFET
significantly simplifies power supply designs that require
CV and CC regulation capabilities. FSEZ1016A controls
the output voltage and current precisely with only the
information in the primary side of the power supply, not
only removing the output current sensing loss, but also
eliminating all secondary feedback circuitry.
ƒ
ƒ
ƒ
ƒ
ƒ
Low Startup Current: 10μA Maximum
ƒ
ƒ
Brownout Protection with Auto-Restart
ƒ
ƒ
Fixed PWM Frequency at 43kHz with Frequency
Hopping to Reduce EMI
Low Operating Current: 3.5mA
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
Over-Temperature Protection (OTP)
with Auto-Restart
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.
Compared with conventional secondary-side regulation
approach; the FSEZ1016A can reduce total cost,
component
count,
size,
and
weight;
while
simultaneously increasing efficiency, productivity, and
system reliability.
FSEZ1016A is available in a 7-pin SOIC package.
VDD Over-Voltage Protection (OVP) with
Auto-Restart
A typical output CV/CC characteristic envelope is shown
in Figure 1.
VDD Under-Voltage Lockout (UVLO)
SOIC-7 Package
Applications
ƒ Battery Chargers for Cellular Phones, Cordless
Phones, PDAs, Digital Cameras, Power Tools
ƒ
ƒ
Replaces Linear Transformer and RCC SMPS
Offline High Brightness (HB) LED Drivers
Related Resources
ƒ AN-6067 Design Guide for FAN100/102 and
Figure 1.
Typical Output V-I Characteristic
FSEZ1016A/1216
Ordering Information
Part Number
Operating
Temperature
Range
MOSFET
BVDSS
MOSFET
RDS(ON)
Eco
Status
Package
Packing
Method
FSEZ1016AMY
-40°C to +125°C
600V
9.3Ω
(Typical)
Green
7-Lead, Small Outline
Integrated Circuit
Package (SOIC)
Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
www.fairchildsemi.com
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
January 2010
CSN2
VO
Bridge
rectifier
diode
RSN1
VDL
+
CDL
CSN1
NP
RSTART
-
DSN
DDD
AC line
CDD
FSEZ1016A
RCS
1
CS
DRAIN
NA
8
2 GND
RS1
3 COMI
VDD 6
4 COMV
VS 5
RS2
CCOMI
RCOMI
CS
CCOMV
RCOMV
Figure 2.
Typical Application
Internal Block Diagram
Figure 3.
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
RSN2
NS
DR
IO
CO
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Application Diagram
Functional Block Diagram
www.fairchildsemi.com
2
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Marking Information
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=SOIC)
P - Y: Green Package
M - Manufacture Flow Code
ZXYTT
EZ1016A
TPM
Figure 4.
Top Mark
Pin Configuration
Figure 5.
Pin Configuration
Pin Definitions
Pin #
Name
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
VDD
7
NC
8
DRAIN
Description
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 base on
voltage of auxiliary winding. This pin connected two divider resistors and one capacitor.
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.
No connection.
Drain. This pin is the high-voltage power MOSFET drain.
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • 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
VDS
600
V
TC=25°C
1.0
A
TC=100°C
0.6
A
Drain-Source Voltage
ID
Continuous Drain Current
IDM
Pulsed Drain Current
4
A
EAS
Single Pulse Avalanche Energy
33
mJ
IAR
Avalanche Current
1
A
PD
Power Dissipation (TA＜50°C)
660
mW
ΘJA
Thermal Resistance (Junction-to-Air)
153
°C/W
ΘJC
Thermal Resistance (Junction-to-Case)
39
°C/W
TJ
TSTG
TL
ESD
Operating Junction Temperature
-40
+150
°C
Storage Temperature Range
-55
+150
°C
+260
°C
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Electrostatic Discharge Capability
Human Body Model,
JEDEC: JESD22-A114
Charged Device Model,
JEDEC: JESD22-C101
2
kV
2
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.
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Absolute Maximum Ratings
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
FSEZ1016A • 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
VDD Section
VOP
Continuously-Operating Voltage
25
V
VDD-ON
Turn-On Threshold Voltage
15
16
17
V
VDD-OFF
Turn-Off Threshold Voltage
4.5
5.0
5.5
V
IDD-ST
Startup Current
0<VDD<VDD-ON-0.16V
3.7
10.0
μA
IDD-OP
Operating Current
VDD=20V, fS= fOSC
VVS=2V, VCS=3V
CL=1nF
3.5
5.0
mA
IDD-GREEN
Green Mode Operating Supply Current
VDD=20V, VVS=2.7V
CL=1nF, VCOMV=0V
fS=fOSC-N-MIN, VCS=0V
1.0
2.5
mA
VDD-OVP
VDD OVP Level
VCS=3V, VVS=2.3V
27
28
29
V
tD-VDDOVP
VDD OVP Debounce Time
fS=fOSC, VVS=2.3V
100
250
400
μs
Oscillator Section
Center Frequency
TA=25°C
40
43
46
Frequency Hopping Range
TA=25°C
±1.8
±2.6
±3.6
fOSC
Frequency
fFHR
Frequency Hopping Period
TA=25°C
fOSC-N-MIN
Minimum Frequency at No-Load
fOSC-CM-MIN
KHz
3
ms
VVS=2.7V, VCOMV=0V
550
Hz
Minimum Frequency at CCM
VVS=2.3V, VCS=0.5V
20
KHz
fDV
Frequency Variation vs. VDD Deviation
TA=25°C, VDD=10V to
25V
5
%
fDT
Frequency Variation vs. Temperature
Deviation
TA=-40°C to +125°C
20
%
Voltage-Sense Section
IVS-UVP
Itc
VBIAS-COMV
Sink Current for Brownout Protection
RVS=20kΩ
IC Compensation Bias Current
VCOMV=0V, TA=25°C,
RVS=20KΩ
Adaptive Bias Voltage Dominated by VCOMV
180
μA
9.5
μA
1.4
V
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Electrical Characteristics
Current-Sense Section
tPD
Propagation Delay to Gate Output
100
200
ns
tMIN-N
Minimum On Time at No-Load
VVS= -0.8V, RCS=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
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
4.5
2.500
2.525
V
V
Continued on the following page…
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • 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
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
V
Internal MOSFET Section
DCYMAX
BVDSS
Maximum Duty Cycle
75
ID=250μA, VGS=0V
Drain-Source Breakdown Voltage
∆BVDSS /∆TJ Breakdown Voltage Temperature Coefficient
ID=250μA, Referenced
to 25°C
%
600
V
0.6
V/°C
IS
Maximum Continuous Drain-Source Diode
Forward Current
1
A
ISM
Maximum Pulsed Drain-Source Diode
Forward Current
4
A
11.5
Ω
VDS=600V, VGS=0V,
TC=25°C
1
μA
VDS=480V, VGS=0V,
TC=100°C
10
μA
7
24
ns
Rise Time
21
52
ns
Turn-Off Delay Time
13
36
ns
Fall Time
27
64
ns
130
170
pF
19
25
pF
RDS(ON)
IDSS
tD-ON
tr
tD-OFF
tf
Static Drain-Source On-Resistance
ID=0.5A, VGS=10V
Drain-Source Leakage Current
Turn-On Delay Time
CISS
Input Capacitance
COSS
Output Capacitance
VDS=300V, ID=1.1A,
RG=25Ω
(3,4)
VGS=0V, VDS=25V
fS=1MHz
9.3
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Electrical Characteristics (Continued)
Over-Temperature-Protection Section
TOTP
Threshold Temperature for OTP
140
°C
Notes:
3. Pulse Test: pulse width ≦ 300μs; duty cycle ≦ 2%.
4. Essentially independent of operating temperature.
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
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
4.5
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
0
Temperature (ºC)
Figure 6.
Turn-On Threshold Voltage (VDD-ON)
vs. Temperature
Figure 7.
4.5
75
85
100
125
Turn-Off Threshold Voltage (VDD-OFF)
vs. Temperature
44
fOSC (KHz)
IDD-OP (mA)
50
45
4.1
3.7
3.3
2.9
43
42
41
40
39
2.5
-40
-30
-15
0
25
50
75
85
100
-40
125
-30
-15
Figure 8.
0
25
50
75
85
100
125
Temperature (ºC)
Temperature (ºC)
Operating Current (IDD-OP)
vs. Temperature
Figure 9.
2.525
2.525
2.515
2.515
2.505
2.505
VIR (V)
VVR (V)
25
Temperature (ºC)
2.495
2.485
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Typical Performance Characteristics
Center Frequency (fOSC) vs. Temperature
2.495
2.485
2.475
2.475
-40
-30
-15
0
25
50
75
85
100
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
FSEZ1016A • Rev. 1.0.2
-30
Figure 11. Reference Voltage (VIR) vs. Temperature
www.fairchildsemi.com
7
25
560
23
fOSC-CM-MIN (KHz)
fOSC-N-MIN (Hz)
600
520
480
440
21
19
17
400
15
-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
1300
30
25
1200
tMIN-N (ns)
20
15
10
1100
1000
900
5
0
800
-40
-30
-15
0
25
50
75
85
100
-40
125
-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
5
1
4
0.8
3
0.6
VG (V)
VN (V)
50
Temperature (ºC)
Figure 12. Minimum Frequency at No Load
(fOSC-N-MIN) vs. Temperature
SG (KHz/V)
0
2
1
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Typical Performance Characteristics (Continued)
0.4
0.2
0
0
-40
-30
-15
0
25
50
75
85
100
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
FSEZ1016A • Rev. 1.0.2
-30
www.fairchildsemi.com
8
95
92
91
IV-SOURCE (μA)
IV-SINK (μA)
95
89
86
83
87
83
79
80
75
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
0
Temperature (ºC)
50
75
85
100
125
Figure 19. Output Source Current (IV-SOURCE)
vs. Temperature
65
65
62
62
II-SOURCE (μA)
II-SINK (μA)
Figure 18. Output Sink Current (IV-SINK)
vs. Temperature
59
56
53
59
56
53
50
50
-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 20. Output Sink Current (II-SINK)
vs. Temperature
Figure 21. Output Source Current (II-SOURCE)
vs. Temperature
80
800
750
76
700
DCYMAX (%)
BVDSS (V)
25
Temperature (ºC)
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Typical Performance Characteristics (Continued)
650
600
72
68
64
550
500
60
-40
-30
-15
0
25
50
75
85
100
-40
125
Temperature (ºC)
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 22. Drain-Source Breakdown Voltage (BVDSS)
vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
-30
Figure 23. Maximum Duty Cycle (DCYMAX)
vs. Temperature
www.fairchildsemi.com
9
Figure 24 shows the basic circuit diagram of a primaryside regulated flyback converter, with typical waveforms
shown in Figure 25. Generally, discontinuous
conduction mode (DCM) operation is preferred for
primary-side regulation because it allows better output
regulation. The operation principles of DCM flyback
converter are as follows:
regulation mode, VCOMI determines the duty cycle while
VCOMV is saturated to HIGH.
IO
D
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.
+
V DL
VAC
Lm
+
+ VF -
VO
-
L
O
A
D
-
Ids
When the MOSFET is turned off, the energy stored in
the inductor forces the rectifier diode (D) to turn on.
While the diode is conducting, the output voltage (VO),
together with diode forward-voltage drop (VF), are
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.
EA_I
V COMI
IO
Estimator
CS
RCS
Ref
t DIS
Detector
PWM
Control
V COMV
VS
NA
VDD
VO
Estimator
EA_V
RS1
Ref
RS2
Primary-Side Regulation
Controller
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 MOSFET.
+
Vw
-
Figure 24. 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. 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.
Id s (MOSFET Drain-to-Source Current)
I pk
ID (Diode Current)
I pk •
NP
NS
I D .avg = I
Meanwhile, the output current can be estimated using
the peak drain current and inductor current discharge
time since output current is the same as the average of
the diode current in steady state.
o
VW (Auxiliary Winding Voltage)
VF •
The output current estimator detects the peak value of
the drain current by a peak detection circuit and
calculates the output current by 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 •
t ON
t
t
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
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
ID
Np:Ns
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Functional Description
NA
NS
DI S
S
Figure 25. Key Waveforms of DCM Flyback
Converter
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.
ts
Green-Mode Operation
ts
The FSEZ1016A uses voltage regulation error amplifier
output (VCOMV) as an indicator of the output load and
modulates the PWM frequency, as shown in Figure 26,
such that the switching frequency decreases as load
decreases. In heavy-load conditions, the switching
frequency is fixed at 43KHz. Once VCOMV decreases
below 2.8V, the PWM frequency starts to linearly
decrease from 43KHz to 550Hz to reduce the switching
losses. As VCOMV decreases below 0.8V, the switching
frequency is fixed at 550Hz and FSEZ1016A enters
“deep green” mode, where the operating current drops
to 1mA, reducing the standby power consumption.
ts
fs
45.6kHz
43 .0kHz
40 .4kHz
Swi tching Frequen cy
t
3ms
Figure 27. Frequency Hopping
43kHz
Startup
Dee p
G reen
Mode
Green Mod e
Figure 28 shows the typical startup circuit and
transformer auxiliary winding for a FSEZ1016A
application. Before FSEZ1016A begins switching, it
consumes only startup current (typically 10μA) and the
current supplied through the startup resistor charges the
VDD capacitor (CDD). When VDD reaches turn-on voltage
of 16V (VDD-ON), FSEZ1016A begins switching, and the
current consumed increases to 3.5mA. Then, the power
required for FSEZ1016A is supplied from the
transformer auxiliary winding. The large hysteresis of
VDD provides more hold-up time, which allows using a
small capacitor for VDD.
Normal Mod e
550H z
0 .8 V
2 .8V
V COMV
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Gate Drive Signal
Temperature Compensation
Figure 26. Switching Frequency in Green Mode
Leading-Edge Blanking (LEB)
VDL
+
At the instant the MOSFET is turned on, there is a highcurrent spike 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. FSEZ1016A
employs an internal leading-edge blanking (LEB) circuit
to inhibit the PWM comparator for a short time after the
MOSFET is turned on. External RC filtering is not required.
CDL
RSTART
DDD
CDD
AC line
NA
FSEZ1016A
1
Frequency Hopping
CS
2 GND
3
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. FSEZ1016A has an internal frequencyhopping circuit that changes the switching frequency
between 40.4kHz and 45.6kHz with a period of 3ms, as
shown in Figure 27.
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
-
Np
COMI
4
COMV
DRAIN 8
RS1
VDD
VS
6
5
RS2
Figure 28. Startup Circuit
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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 FSEZ1016A has several self-protective functions,
such as Over-Voltage Protection (OVP), OverTemperature
Protection
(OTP),
and
brownout
protection. All the protections are implemented as autorestart mode. When the 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
FSEZ1016A 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, FSEZ1016A resumes normal operation.
In this manner, the auto-restart alternately enables and
disables the switching of the MOSFET until the fault
condition is eliminated (see Figure 29).
VDS
Over-Temperature Protection (OTP)
A built-in temperature-sensing circuit shuts down PWM
output if the junction temperature exceeds 140°C.
Brownout Protection
FSEZ1016A detects the line voltage using auxiliary
winding voltage since the auxiliary winding voltage
reflects the input voltage when the MOSFET is turned
on. The VS pin is clamped at 1.15V while the MOSFET
is turned on and brownout protection is triggered if the
current out of the 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
16V
5V
Operating Current
3.5mA
10µA
Normal
Operation
Fault
Situation
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Protections
Normal
Operation
Figure 29. Auto-Restart Operation
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
www.fairchildsemi.com
12
Application
Fairchild Devices
Input Voltage Range
Output
Offline LED Driver
FSEZ1016A
90~265VAC
12V/0.35A (4.2W)
Features
ƒ
High Efficiency (>74% at Full Load)
ƒ
Tight Output Regulation (CC:±5%)
18
80
78
14
77
12
Output Voltage (V)
Efficiency (%)
AC90V
AC120V
AC230V
AC264V
16
79
76
75
74
10
8
6
73
4
72
2
71
70
0
90
120
150
180
210
240
270
0
Line Voltage (Vac)
50
100
150
200
250
Output current (mA)
Figure 30. Measured Efficiency and Output Regulation
300
350
400
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Typical Application Circuit (Primary-Side Regulated Offline LED Driver)
Figure 31. Schematic of Typical Application Circuit
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
www.fairchildsemi.com
13
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Typical Application Circuit (Continued)
Transformer Specification
ƒ
ƒ
Core: EE16
Bobbin: EE16
Figure 32.
Transformer Diagram
Pin
Specifications
Primary-Side Inductance
2－1
1.95mH ± 8%
Primary-Side Effective Leakage
2－1
60μH Maximum
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
Remark
100kHz, 1V
Short one of the secondary windings
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14
5.00
4.80
A
0.65
3.81
8
5
B
6.20
5.80
1
PIN ONE
INDICATOR
1.75
4.00
3.80
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
0.25
0.19
C
0.10
0.51
0.33
0.50 x 45°
0.25
R0.10
C
OPTION A - BEVEL EDGE
GAGE PLANE
R0.10
OPTION B - NO BEVEL EDGE
0.36
8°
0°
0.90
0.406
SEATING PLANE
(1.04)
DETAIL A
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
Physical Dimensions
NOTES:
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012 VARIATION AA EXCEPT FOR MISSING PIN 7.
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) DRAWING FILENAME: M07AREV2
SCALE: 2:1
Figure 33.
7-Lead, Small-Outline Integrated Circuit Package (SOIC)
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
FSEZ1016A • Rev. 1.0.2
www.fairchildsemi.com
15
FSEZ1016A — Primary-Side-Regulation PWM Integrated Power MOSFET
© 2009 Fairchild Semiconductor Corporation
FSEZ1016A • Rev. 1.0.2
www.fairchildsemi.com
16