FAIRCHILD FSEZ1317

FSEZ1317 (EZ-PSR for 2-Chip Product)
Primary-Side-Regulation PWM with POWER MOSFET
Integrated
Features
Description
ƒ
ƒ
ƒ
ƒ
Low Standby Power Under 30mW
ƒ
ƒ
Green-Mode: Linearly Decreasing PWM Frequency
This third-generation Primary Side Regulation (PSR)
and highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback
converters.
The
proprietary
topology,
TRUECURRENT™, of FSEZ1317 enables precise CC
regulation and simplified circuit design for batterycharger applications. A low-cost, smaller, and lighter
charger results, as compared to a conventional design
or a linear transformer.
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
Cable Compensation in CV Mode
ƒ
Available in the 7-Lead SOP and DIP Packages
High-Voltage Startup
Fewest External Component Counts
Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
Fixed PWM Frequency at 50kHz with Frequency
Hopping to Solve EMI Problem
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
VDD Over-Voltage Protection with Auto Restart
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 15V
To minimize standby power consumption, the
proprietary green mode provides off-time modulation to
linearly decrease PWM frequency under light-load
conditions. Green mode assists the power supply in
meeting power conservation requirements.
By using the FSEZ1317, a charger can be implemented
with few external components and minimized cost. A
typical output CV/CC characteristic envelope is shown
in Figure 1.
Fixed Over-Temperature Protection with
Auto Restart
Applications
ƒ
Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools, etc.
ƒ
Replaces linear transformers and RCC SMPS
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
Operating
Temperature Range
Package
Packing
Method
FSEZ1317MY
-40°C to +105°C
7-Lead, Small Outline Package (SOP-7)
Tape & Reel
FSEZ1317NY
-40°C to +105°C
7-Lead, Dual Inline Package (DIP-7)
Tube
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
May 2010
Rsn
L1
T1
Rsn2
D1
DF
Csn
D4
CO1
RF
Rsn1
AC
Input
C1
D2
Csn2
D3
CO2
Rd
DC
Output
Dsn
C2
CVDD
DFa
R1
CVS
7 HV
DRAIN
8
1
CS
3 GND
R2
VS 5
2 VDD
COMR 4
RSENSE
CCR
Figure 2. Typical Application
Internal Block Diagram
Figure 3. Functional Block Diagram
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
2
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Application Diagram
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, N=DIP)
P: Y=Green Package
M: Manufacture Flow Code
Figure 4. Top Mark
Pin Configuration
Figure 5. SOP and Dip Pin Configuration
Pin Definitions
Pin #
Name
Description
1
CS
Current Sense. This pin connects a current-sense resistor, to detect the MOSFET current for
peak-current-mode control in CV mode, and provides the output-current regulation in CC mode.
2
VDD
Power Supply. 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.
3
GND
Ground
4
COMR
Cable Compensation. This pin connects a 1µF capacitor between the COMR and GND pins
for compensation voltage drop due to output cable loss in CV mode.
5
VS
Voltage Sense. This pin detects the output voltage information and discharge time based on
voltage of auxiliary winding.
7
HV
High Voltage. This pin connects to bulk capacitor for high-voltage startup.
8
DRAIN
Driver Output. Power MOSFET drain. This pin is the high-voltage power MOSFET drain.
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
3
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Marking Information
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
VHV
Parameter
HV Pin Input Voltage
(1,2)
VVDD
DC Supply Voltage
VVS
VS Pin Input Voltage
VCS
Min.
-0.3
Max.
Units
500
V
30
V
7.0
V
CS Pin Input Voltage
-0.3
7.0
V
VCOMV
Voltage Error Amplifier Output Voltage
-0.3
7.0
V
VCOMI
Current Error Amplifier Output Voltage
-0.3
7.0
V
VDS
Drain-Source Voltage
700
V
TA=25°C
1
A
TA=100°C
0.6
A
ID
Continuous Drain Current
IDM
Pulsed Drain Current
4
A
EAS
Single Pulse Avalanche Energy
50
mJ
IAR
Avalanche Current
1
A
PD
Power Dissipation (TA＜50°C)
660
mW
θJA
Thermal Resistance (Junction-to-Air)
150
°C/W
DIP
95
°C/W
SOP
39
°C/W
DIP
25
°C/W
+150
°C
ΨJT
TJ
TSTG
TL
ESD
SOP
Thermal Resistance (Junction-to-Case)
Operating Junction Temperature
-40
Storage Temperature Range
-55
Lead Temperature (Reflow, 3 Cycles)
Electrostatic Discharge Capability
(Except HV Pin)
+150
°C
+260
°C
Human Body Model,
JEDEC-JESD22_A114
3500
Charged Device Model,
JEDEC-JESD22_C101
1250
V
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 the 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
Operating Ambient Temperature
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
Min.
Max.
Units
-40
+105
°C
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4
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Absolute Maximum Ratings
Unless otherwise specified, VDD=15V and TA=25℃.
Symbol
Parameter
Conditions
Min.
Typ.
Max. Units
VDD Section
VOP
Continuously Operating Voltage
23
V
VDD-ON
Turn-On Threshold Voltage
15
16
17
V
VDD-OFF
Turn-Off Threshold Voltage
4.5
5.0
5.5
V
Operating Current
2.5
5.0
mA
IDD-GREEN
Green-Mode Operating Supply Current
0.95
1.20
mA
VDD-OVP
VDD Over-Voltage-Protection Level (OVP)
IDD-OP
VDD-OVP-HYS
tD-VDDOVP
24
V
Hysteresis Voltage for VDD OVP
1.5
2.0
2.5
V
VDD Over-Voltage-Protection Debounce Time
50
200
300
µs
HV Startup Current Source Section
VHV-MIN
Minimum Startup Voltage on HV Pin
50
V
IHV
Supply Current Drawn from HV Pin
VDC=100V
1.5
3.0
mA
Leakage Current after Startup
HV=500V,
VDD= VDDOFF+1V
0.96
3.00
µA
IHV-LC
Oscillator Section
fOSC
fOSC-N-MIN
fOSC-CM-MIN
Frequency
Center Frequency
Frequency Hopping Range
47
50
53
±1.5
±2.0
±2.5
Minimum Frequency at No-Load
370
Minimum Frequency at CCM
Hz
13
fDV
Frequency Variation vs. VDD Deviation
VDD=10~25V,
fDT
Frequency Variation vs. Temperature Deviation
TA=-40°C to
105°C
1
kHz
kHz
2
%
15
%
Voltage-Sense Section
Itc
VBIAS-COMV
IC Bias Current
Adaptive Bias Voltage Dominated by VCOMV
RVS=20kΩ
10
µA
1.4
V
Current-Sense Section
tPD
tMIN-N
VTH
Propagation Delay to GATE Output
Minimum On Time at No-Load
700
Threshold Voltage for Current Limit
90
200
ns
850
1050
ns
0.8
V
Voltage-Error-Amplifier Section
VVR
Reference Voltage
VN
Green-Mode Starting Voltage on EA_V
fOSC-2kHz
2.475
2.500
2.5
2.525
V
V
VG
Green-Mode Ending Voltage on EA_V
fOSC=1kHz
0.4
V
Current-Error-Amplifier Section
VIR
Reference Voltage
2.475
2.500
2.525
V
Cable Compensation Section
VCOMR
COMR Pin for Cable Compensation
0.75
V
Continued on the following page…
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
5
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Electrical Characteristics
Unless otherwise specified, VDD=15V and TA=25℃.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
70
75
80
%
(3)
Internal MOSFET Section
DCYMAX
BVDSS
∆BVDSS/∆TJ
RDS(ON)
IS
IDSS
Maximum Duty Cycle
Drain-Source Breakdown Voltage
ID=250μA,
VGS=0V
Breakdown Voltage Temperature Coefficient
ID=250μA,
Referenced to
TA=25°C
Static Drain-Source On-Resistance
ID=0.5A,
VGS=10V
700
V
0.53
13
16
Ω
1
A
VDS=700V,
TA=25°C
10
µA
VDS=560V,
TA=100°C
100
µA
10
30
ns
20
50
ns
175
200
pF
23
25
pF
Maximum Continuous Drain-Source Diode Forward
Current
Drain-Source Leakage Current
tD-ON
Turn-On Delay Time
tD-OFF
Turn-Off Delay Time
CISS
Input Capacitance
COSS
Output Capacitance
V/°C
VDS=350V,
ID=1A,
(4)
RG=25Ω
VGS=0V,
VDS=25V,
fS=1MHz
Over-Temperature-Protection Section
TOTP
Threshold Temperature for OTP
(5)
+140
°C
Notes:
3. These parameters, although guaranteed, are not 100% tested in production.
4. Pulse test: pulsewidth ≦ 300µs, duty cycle ≦ 2%.
5. When the Over-temperature protection is activated, the power system enter latch mode and output is disabled.
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
6
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Electrical Characteristics (Continued)
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)
Turn-On Threshold Voltage (VDD-ON)
vs. Temperature
Figure 7.
5
54
4.2
52
Fosc (KHz)
IDD_OP (mA)
Figure 6.
3.4
2.6
1.8
50
75
85
100
125
Turn-Off Threshold Voltage (VDD-OFF)
vs. Temperature
50
48
46
1
44
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
Temperature (ºC)
Figure 8.
0
25
50
75
85
100
125
Temperature (ºC)
Operating Current (IDD-OP) vs.
Temperature
Figure 9.
2.525
1.2
2.515
1.12
IDD_Green (mA)
VVR (V)
25
Temperature (ºC)
2.505
2.495
2.485
Center Frequency (fOSC) vs. Temperature
1.04
0.96
0.88
2.475
0.8
-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
FSEZ1317 • Rev. 1.0.4
-30
Figure 11. Green Mode Operating Supply Current
(IDD-GREEN) vs. Temperature
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7
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Typical Performance Characteristics
15
420
14.2
Fosc_CM_MIN (KHz)
Fosc_Green (Hz)
450
390
360
330
13.4
12.6
11.8
300
11
-40
-30
-15
0
25
50
75
85
100
-40
125
-30
-15
0
Temperature (ºC)
50
75
85
100
125
Figure 13. Minimum Frequency at CCM (fOSC-CM-MIN)
vs. Temperature
3
1050
2.4
980
T MIN_N (ns)
IHV (mA)
Figure 12. Minimum Frequency at No Load
(fOSC-N-MIN) vs. Temperature
1.8
1.2
910
840
770
0.6
700
0
-40
-30
-15
0
25
50
75
85
100
-40
125
-30
-15
0
25
50
75
85
100
125
Temperature (ºC)
Temperature (ºC)
Figure 14. Supply Current Drawn from HV Pin (IHV)
vs. Temperature
Figure 15. Minimum On Time at No Load (tMIN-N)
vs. Temperature
2.55
0.65
2.52
0.56
2.49
0.47
V g (V)
V n (V)
25
Temperature (ºC)
2.46
2.43
0.38
0.29
2.4
0.2
-40
-30
-15
0
25
50
75
85
100
125
-40
Temperature (ºC)
Figure 16. Green Mode Starting Voltage on EA_V
(VN) vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
-30
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 17. Green Mode Ending Voltage on EA_V (VG)
vs. Temperature
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FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Typical Performance Characteristics (Continued)
11
1.5
10.5
VBIAS_COMV (V)
1.42
ITC (uA)
10
9.5
9
1.34
1.26
1.18
8.5
8
1.1
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
0
Temperature (ºC)
50
75
85
100
125
Figure 19. Adaptive Bias Voltage Dominated by VCOMV
(VBIAS-COMV) vs. Temperature
0.82
3
0.815
2.5
0.81
2
IHV_LC (uA)
V TH (V)
Figure 18. IC Bias Current (Itc) vs. Temperature
0.805
0.8
0.795
1.5
1
0.5
0.79
0
-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. Threshold Voltage for Current Limit (VTH)
vs. Temperature
Figure 21. Leakage Current after Startup (IHV-LC)
vs. Temperature
80
0.82
0.8
78
0.78
DCYMax (%)
VCOMR (V)
25
Temperature (ºC)
0.76
0.74
76
74
72
0.72
70
0.7
-40
-30
-15
0
25
50
75
85
100
125
-40
Temperature (ºC)
-15
0
25
50
75
85
100
125
Temperature (ºC)
Figure 22. Variation Test Voltage on COMR Pin for
Cable Compensation (VCOMR) vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
-30
Figure 23. Maximum Duty Cycle (DCYMAX)
vs. Temperature
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9
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Typical Performance Characteristics (Continued)
Figure 24 shows the basic circuit diagram of 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:
constant current regulation mode, VCOMI determines the
duty cycle while VCOMV is saturated to HIGH.
ID
Np:Ns
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 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.
EA_I
V COMI
IO
Estimator
CS
RCS
Ref
t DIS
Detector
PWM
Control
V COMV
VS
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 the MOSFET.
NA
VDD
VO
Estimator
+
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. 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 because output current is same as the average of
the diode current in steady state.
VF ⋅
The output current estimator picks up 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 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 25. Key Waveforms of DCM Flyback
Converter
Among the two error voltages, VCOMV and VCOMI, the
smaller one determines the duty cycle. Therefore, during
constant voltage regulation mode, VCOMV determines the
duty cycle while VCOMI is saturated to HIGH. During
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
10
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Functional Description
In cellular phone charger applications, the battery is
located at the end of cable, which typically causes
several percentage of voltage drop on the battery
voltage. FSEZ1317 has a built-in cable voltage drop
compensation that provides a constant output voltage at
the end of the cable over the entire load range in CV
mode. As load increases, the voltage drop across the
cable is compensated by increasing the reference
voltage of the voltage regulation error amplifier.
Operating Current
The FSEZ1317 operating current is as small as 2.5mA,
which results in higher efficiency and reduces the VDD
hold-up capacitance requirement. Once FSEZ1317
enters “deep” green mode, the operating current is
reduced to 0.95mA, assisting the power supply in
meeting power conservation requirements.
Green-Mode Operation
The FSEZ1317 uses voltage regulation error amplifier
output (VCOMV) as an indicator of the output load and
modulates the PWM frequency as shown in Figure 26.
The switching frequency decreases as the load
decreases. In heavy load conditions, the switching
frequency is fixed at 50kHz. Once VCOMV decreases
below 2.5V, the PWM frequency linearly decreases from
50kHz. When FSEZ1317 enters deep green mode, the
PWM frequency is reduced to a minimum frequency of
370Hz, thus gaining power saving to meet international
power conservation requirements.
Figure 27. Frequency Hopping
High-Voltage Startup
Figure 28 shows the HV-startup circuit for FSEZ1317
applications. The HV pin is connected to the line input or
bulk capacitor through a resistor, RSTART (100kΩ
recommended). During startup status, the internal
startup circuit is enabled. Meanwhile, line input supplies
the current, ISTARTUP, to charge the hold-up capacitor,
CDD, through RSTART. When the VDD voltage reaches
VDD-ON, the internal startup circuit is disabled, blocking
ISTARTUP from flowing into the HV pin. Once the IC turns
on, CDD is the only energy source to supply the IC
consumption current before the PWM starts to switch.
Thus, CDD must be large enough to prevent VDD from
dropping down to VDD-OFF before the power can be
delivered from the auxiliary winding.
Figure 26. Switching Frequency in Green Mode
Frequency Hopping
1
8
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. FSEZ1317 has an internal frequency
hopping circuit that changes the switching frequency
between 47kHz and 53kHz over the period shown in
Figure 27.
2
7
3
4
5
Figure 28. HV Startup Circuit
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
11
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Cable Voltage Drop Compensation
The turn-on and turn-off thresholds are fixed internally at
16V and 5V, respectively. During startup, the hold-up
capacitor must be charged to 16V through the startup
resistor to enable the FSEZ1317. The hold-up capacitor
continues to supply VDD until power can be delivered
from the auxiliary winding of the main transformer. VDD
is not allowed to drop below 5V during this startup
process. This UVLO hysteresis window ensures that
hold-up capacitor properly supplies VDD during startup.
Pulse-by-pulse Current Limit
When the sensing voltage across the current-sense
resistor exceeds the internal threshold of 0.8V, the
MOSFET is turned off for the remainder of switching
cycle. In normal operation, the pulse-by-pulse current
limit is not triggered since the peak current is limited by
the control loop.
Leading-Edge Blanking (LEB)
Each time the power MOSFET switches on, a turn-on
spike occurs at the sense resistor. To avoid premature
termination of the switching pulse, a leading-edge
blanking time is built in. During this blanking period,
the current-limit comparator is disabled and cannot
switch off the gate driver. As a result conventional RC
filtering can be omitted.
Protections
The FSEZ1317 has several self-protection functions,
such as Over-Voltage Protection (OVP), OverTemperature Protection (OTP), and pulse-by-pulse
current limit. All the protections are implemented as
auto-restart mode. Once the abnormal condition occurs,
the switching is terminated and the MOSFET remains
off, causing VDD to drop. When VDD drops to the VDD
turn-off voltage of 5V, internal startup circuit is enabled
again and the supply current drawn from the HV pin
charges the hold-up capacitor. When VDD reaches the
turn-on voltage of 16V, normal operation resumes. In
this manner, the auto-restart alternately enables and
disables the switching of the MOSFET until the
abnormal condition is eliminated (see Figure 29).
Gate Output
The FSEZ1317 output stage is a fast totem-pole gate
driver. Cross conduction has been avoided to minimize
heat dissipation, increase efficiency, and enhance
reliability. The output driver is clamped by an internal
15V Zener diode to protect the power MOSFET
transistors against undesired over-voltage gate signals.
Built-In Slope Compensation
The sensed voltage across the current-sense resistor is
used for current mode control and pulse-by-pulse
current limiting. Built-in slope compensation improves
stability and prevents sub-harmonic oscillations due to
peak-current mode control. The FSEZ1317 has a
synchronized, positive-slope ramp built-in at each
switching cycle.
Noise Immunity
Noise from the current sense or the control signal can
cause significant pulsewidth jitter, particularly in
continuous-conduction
mode.
While
slope
compensation helps alleviate these problems, further
precautions should still be taken. Good placement and
layout practices should be followed. Avoiding long PCB
traces and component leads, locating compensation
and filter components near the FSEZ1317, and
increasing the power MOS gate resistance are advised.
Figure 29. Auto-Restart Operation
VDD Over-Voltage Protection (OVP)
VDD over-voltage protection prevents damage from overvoltage conditions. If the VDD voltage exceeds 24V at
open-loop feedback condition, OVP is triggered and the
PWM switching is disabled. The OVP has a debounce
time (typically 200µs) to prevent false triggering due to
switching noises.
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
12
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Over-Temperature Protection (OTP)
The built-in temperature-sensing circuit shuts down
PWM output if the junction temperature exceeds 140°C.
Under-Voltage Lockout (UVLO)
Application
Fairchild Devices
Input Voltage Range
Output
Output DC cable
Cell Phone Charger
FSEZ1317 (SOP-7)
90~265VAC
5V/0.7A (3.5W)
AWG26, 1.8 Meter
Features
„
„
High efficiency (>65.5% at full load) meeting EPS 2.0 regulation with enough margin
Low standby (Pin<30mW at no-load condition)
Figure 30. Measured Efficiency
Figure 31.
Standby Power
Figure 32. Schematic of Typical Application Circuit
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
13
FSEZ1317 —Primary-Side-Regulation PWM with POWER MOSFET Integrated
Typical Application Circuit (Primary-Side Regulated Flyback Charger)
Transformer Specification
ƒ
ƒ
Core: EE16
Bobbin: EE16
Figure 33. Transformer Specification
Notes:
6. When W4R’s winding is reversed winding, it must wind one layer.
7. When W2 is winding, it must wind three layers and put one layer of tape after winding the first layer.
No.
Terminal
Insulation
Wire
ts
15
2
41
1
39
0
37
2
S
F
W1
4
5
2UEW 0.23*2
W2
3
1
2UEW 0.17*1
ts
W3
1
-
COPPER SHIELD
1.2
3
W4
7
9
TEX-E 0.55*1
9
3
CORE ROUNDING TAPE
Barrier Tape
Primary
Seconds
3
Pin
Specification
Remark
Primary-Side Inductance
1－3
2.25mH ± 7%
100kHz, 1V
Primary-Side Effective Leakage
1－3
80μH ± 5%
Short One of the Secondary Windings
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
14
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Typical Application Circuit (Continued)
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Physical Dimensions
Figure 34. 7-Lead, Small Outline Package (SOP-7)
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
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
15
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
Physical Dimensions
9.40
9.00
7
5
6.60
6.20
1
4
(0.56)
3.60
3.20
5.08 MAX
7.62
0.33
3.60
3.00
2.54
0.56
0.36
0.35
0.20
1.62
1.42
9.91
7.62
7.62
NOTES: UNLESS OTHERWISE SPECIFIED
A) THIS PACKAGE COMPLIES TO JEDEC
MS-001, VARIATION BA, EXCEPT FOR
TERMINAL COUNT (7 RATHER THAN 8)
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH, AND TIE BAR EXTRUSIONS.
D) DIMENSIONS AND TOLERANCES PER
ASME Y14.5M-1994
E) DRAWING FILENAME AND REVISION: MKT-NA07BREV2
Figure 35. 7-Lead, Dual inline Package (DIP-7)
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
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
16
FSEZ1317 — Primary-Side-Regulation PWM with POWER MOSFET Integrated
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com
17