FAN302UL — PWM Controller for Low Standby Power Battery-Charger Applications mWSaver™ Technology
May 2012
FAN302UL
PWM Controller for Low Standby Power Battery-
Charger Applications — mWSaver™ Technology
Features
mWSaver™ Technology Provides
Best-in-Class Standby Power
Achieves <10mW, Far Below Energy Star’s 5-Star
Level (<30mW).
Proprietary 500V High-Voltage JFET Startup
Reduces Startup Resistor Loss
Low Operation Current in Burst Mode:
350µA Maximum
Constant-Current (CC) Control without Secondary-
Side Feedback Circuitry
Fixed PWM Frequency at 140kHz with Frequency
Hopping to Reduce EMI
High-Voltage Startup
Low Operating Current: 3.5mA
Peak-Current-Mode Control with Slope
Compensation
Cycle-by-Cycle Current Limiting
V
DD
Over-Voltage Protection (Auto-Restart)
V
S
Over-Voltage Protection (Latch Mode)
V
DD
Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 15V
Fixed Over-Temperature Protection (Latch Mode)
Available in an 8-Lead SOIC Package
I
O
Description
Advanced PWM controller FAN302UL significantly
simplifies isolated power supply designs that require
Constant Current (CC) regulation of the output. The
output current is precisely estimated with information in
the primary side of the transformer and controlled with
an internal compensation circuit, not only removing the
output current sensing loss, but also eliminating external
CC control circuitry. A Green-Mode function with an
extremely low operating current (200µA) in Burst Mode
maximizes light-load efficiency, enabling conformance
to worldwide Standby Mode efficiency guidelines.
Integrated protections include two-level pulse-by-pulse
current limit, Over-Voltage Protection (OVP), brownout
protection, and Over-Temperature Protection (OTP).
Compared with a conventional approach using external
control circuit in the secondary side for CC regulation;
the FAN302UL reduces total cost, component count,
size, and weight, while simultaneously increasing
efficiency, productivity, and system reliability.
V
O
Maximum
Typical
Minimum
Applications
Battery chargers for cellular phones, cordless phones,
PDA, digital cameras, and power tools. Replaces linear
transformers and RCC SMPS.
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FAN302ULMY
Operating
Temperature Range
-40°C to +105°C
Package
8-Lead, Small-Outline Integrated Circuit (SOIC),
JEDEC MS-012, .150-Inch Narrow Body
Packing
Method
Tape & Reel
© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.3
www.fairchildsemi.com
FAN302UL — PWM Controller for Low Standby Power Battery-Charger Applications mWSaver™ Technology
Application Diagram
Figure 2. Typical Application
Internal Block Diagram
Figure 3. Functional Block Diagram
© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.3
www.fairchildsemi.com
2
FAN302UL — PWM Controller for Low Standby Power Battery-Charger Applications mWSaver™ Technology
Marking Information
F-
Fairchild Logo
Z: Assembly Plant Code
X: Year Code
Y: Week Code
TT: Die Run Code
T: M=SOP
P: Y= Green Package
M: Manufacture Flow Code
Figure 4.Top Mark
Pin Configuration
Figure 5. Pin Assignments
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
CS
GATE
VDD
VS
GND
FB
NC
HV
Description
Current Sense.
This pin connects a current-sense resistor to detect the MOSFET current for
Peak-Current-Mode control for output regulation. The current-sense information is also used to
estimate the output current for CC regulation.
PWM Signal Output.
This pin has an internal totem-pole output driver to drive the power
MOSFET. It is internally clamped at 15V.
Power Supply.
IC operating current and MOSFET driving current are supplied through this pin.
This pin is typically connected to an external V
DD
capacitor.
Voltage Sense.
This pin detects the output voltage information and diode current discharge
time based on voltage of the auxiliary winding.
Ground
Feedback.
Typically, an Opto-Coupler is connected to this pin to provide feedback information
to the internal PWM comparator. This feedback is used to control the duty cycle in CV
regulation.
No Connect
High Voltage.
This pin connects to the DC bus for high-voltage startup.
© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.3
www.fairchildsemi.com
3
FAN302UL — PWM Controller for Low Standby Power Battery-Charger Applications mWSaver™ Technology
Absolute Maximum Ratings
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
V
HV
V
VDD
V
VS
V
CS
V
FB
P
D
θ
JA
θ
JC
T
J
T
STG
T
L
HV Pin Input Voltage
DC Supply Voltage
(1,2)
VS Pin Input Voltage
CS Pin Input Voltage
FB Pin Input Voltage
Parameter
Min.
Max.
500
30
Unit
V
V
V
V
V
mW
°C/W
°C/W
°C
°C
°C
-0.3
-0.3
-0.3
7.0
7.0
7.0
660
150
39
Power Dissipation (T
A
=25°C)
Thermal Resistance (Junction-to-Air)
Thermal Resistance (Junction-to-Case)
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Human Body Model,
JEDEC:JESD22_A114
(Except HV Pin)
(3)
Charged Device Model,
JEDEC:JESD22_C101
(Except HV Pin)
(3)
-40
-55
+150
+150
+260
5.0
ESD
Electrostatic Discharge Capability
kV
1.5
Notes:
1. All voltage values, except differential voltages, are given with respect to the GND pin.
2. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
3. ESD ratings including the HV pin: HBM=500V, CDM=750V.
© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.3
www.fairchildsemi.com
4
FAN302UL — PWM Controller for Low Standby Power Battery-Charger Applications mWSaver™ Technology
Electrical Characteristics
V
DD
=15V and T
A
=25°C unless noted.
Symbol
HV Section
V
HV-MIN
I
HV
I
HV-LC
Parameter
Minimum Startup Voltage on HV Pin
Supply Current Drawn from HV Pin
Leakage Current Drawn from HV Pin
Condition
Min. Typ. Max. Unit
50
V
mA
μA
V
HV
=100V, V
DD
=0V,
Controller Off
V
HV
=500V, V
DD
=15V
(Controller On with
Auxiliary Supply)
V
DD
Rising
V
DD
Falling
V
DD
Falling
V
DD
=V
DD-ON
– 0.16V
V
DD
=18V, f=f
OSC
, C
L
=1nF
V
DD
=8V, C
L
=1nF
f=140kHz
V
CS
=5V, V
S
=2.5, V
FB
=5V
0.8
1.5
0.8
5.0
3.0
V
DD
Section
V
DD-ON
V
DD-OFF
V
DD-LH
I
DD-ST
I
DD-OP
V
DD-OVP
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Threshold Voltage for Latch-Off Release
Startup Current
Operating Supply Current
V
DD
Over-Voltage Protection Level
15
4.7
16
5.0
2.50
400
3.5
200
25.0 26.5
100
135
140
±5
17
V
CS
=5V, V
S
=0V
40
22
45
27
50
450
4.0
350
28.0
180
145
17
5.3
V
V
V
μA
mA
μA
V
μs
I
DD-BURST
Burst-Mode Operating Supply Current
t
D-VDDOVP
V
DD
Over-Voltage Protection Debounce Time
Oscillator Section
f
OSC
f
OSC-CM-MIN
Frequency
Center Frequency
Hopping Range
kHz
kHz
kHz
V/V
kΩ
V
V
V
Minimum Frequency by Continuous Conduction
Mode (CCM) Prevention Circuit
(4)
f
OSC-CCM
Minimum Frequency in (CC) Regulation
Feedback Input Section
A
V
Z
FB
V
FB
-
L
V
FB
-
H
Internal Voltage Scale-Down Ratio of FB Pin
(5)
FB Pin Input Impedance
1/3.5 1/3.0 1/2.5
38
FB Pin Open
V
FB
Falling,V
CS
=5V, V
S
=0V
1.0
42
5.3
1.1
1.2
1.25
44
V
FB-OPEN
FB Pin Pull-Up Voltage
FB Threshold to Disable Gate Drive in Burst Mode
FB Threshold to Enable Gate Drive in Burst Mode
Threshold Temperature for Over-Temperature
Protection
(6)
V
FB
Rising,V
CS
=5V, V
S
=0V 1.05 1.15
Over-Temperature Protection Section
T
OTP
+130 +140 +150
°C
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.3
www.fairchildsemi.com
5
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