FAN6753 — Highly Integrated Green-Mode PWM Controller
February 2011
FAN6753
Highly Integrated Green-Mode PWM Controller
Features
High-Voltage Startup
Low Operating Current: 2.7mA
Adaptive Decreasing PWM Frequency to 22KHz
Built-in Full-Range Frequency Hopping to Reduce
EMI Emission
Fixed PWM Frequency: 65KHz
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking (LEB)
Synchronized Slope Compensation
Internal Auto-Recovery Open-Loop Protection
GATE Output Maximum Voltage Clamp: 18V
V
DD
Under-Voltage Lockout (UVLO)
V
DD
Over-Voltage Protection (OVP),
Auto Recovery / Latch for Option
Internal Auto-Recovery Sense Short-Circuit
Protection for Option
Constant Power Limit (Full AC Input Range)
Internal OTP Sensor with Hysteresis
Built-in 5ms Soft-Start Function
Built-in LATCH Pin Pull HIGH (> 5.2V)
Latch Function
Description
The highly integrated FAN6753 PWM controller provides
several features to enhance the performance of flyback
converters.
To minimize standby power consumption, a proprietary
adaptive green-mode function provides frequency
modulation at light-load conditions. To avoid acoustic-
noise problems, the minimum PWM frequency is set
above 22KHz. This green-mode function enables the
power supply to meet international power conservation
requirements. With the internal high-voltage startup
circuitry, the power loss due to bleeding resistors is also
eliminated. To further reduce power consumption,
FAN6753 is manufactured using the BiCMOS process,
which allows an operating current of only 2.7mA.
FAN6753 integrates a full-range frequency-hopping
function internally that helps reduce EMI emission of a
power supply with minimum line filters. Its built-in
synchronized slope compensation achieves stable peak-
current-mode control. The proprietary internal line
compensation ensures constant output power limit over
a wide AC input voltage range, from 90V
AC
to 264V
AC
.
FAN6753 provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety should an
open-loop or output short-circuit failure occur. PWM
output is disabled until V
DD
drops below the UVLO lower
limit, when the controller starts up again. As long as V
DD
exceeds ~26V, the internal OVP circuit is triggered.
Available in the 8-pin SOP package.
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
Power Adapters
Open-Frame SMPS
Ordering Information
Part Number
FAN6753MY
Operating
Temperature Range
-40C to +105C
Package
8-Lead, Small Outline Package
Packing Method
Tape & Reel
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.3
www.fairchildsemi.com
FAN6753 — Highly Integrated Green-Mode PWM Controller
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:SOP)
P: Y=Green Package
M: Manufacture Flow Code
Figure 1. Top Mark
ZXYTT
6753
TPM
Pin Configuration
LATCH
FB
SENSE
GND
1
2
3
4
8
7
6
5
HV
NC
V
DD
GATE
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
LATCH
FB
SENSE
GND
GATE
V
DD
NC
HV
Description
For external latch circuit used. When V
LATCHth
> 5.2V and after 100µs, IC is latched off.
10KΩ to
GND is recommended. Internal has a sourcing current of 100µA (I
LATCH
), 100µA ×10KΩ. The
voltage on this pin is 1V (under V
LATCHth
=5.2V).
The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is
determined in response to the signal on this pin and the current-sense signal on the SENSE pin.
Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
current limiting.
Ground.
The totem-pole output driver. Soft-driving waveform is implemented for improved EMI.
Power supply. The internal protection circuit disables PWM output as long as V
DD
exceeds the
OVP trigger point.
No connection.
For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors.
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.3
www.fairchildsemi.com
2
FAN6753 — Highly Integrated Green-Mode PWM Controller
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
DD
V
FB
V
SENSE
V
LATCH
V
HV
P
D
JA
T
J
T
STG
T
L
ESD
DC Supply Voltage
(1, 2)
FB Pin Input Voltage
SENSE Pin Input Voltage
LATCH Pin Input Voltage
HV Pin Input Voltage
Power Dissipation (T
A
＜50°C)
Parameter
Min.
-0.3
-0.3
-0.3
Max.
30
7.0
7.0
7.0
500
400
141
Unit
V
V
V
V
V
mW
C/W
C
C
C
V
Thermal Resistance (Junction-to-Air)
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Human Body Model,
JEDEC:JESD22-A114
Charged Device Model,
JEDEC:JESD22-C101
-40
-55
+125
+150
+260
5500
1500
Electrostatic Discharge Capability
Notes:
1. All voltage values, except differential voltages, are given with respect to the network ground terminal.
2. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.3
www.fairchildsemi.com
4
FAN6753 — Highly Integrated Green-Mode PWM Controller
Electrical Characteristics
V
DD
=15V and T
A
=25C unless otherwise noted.
Symbol
V
DD
Section
V
OP
V
DD-ON
V
DD-OFF
I
DD-ST
I
DD-OP
I
DD-OLP
V
TH-OLP
V
DD-OVP
t
D-VDDOVP
HV Section
I
HV
I
HV-LC
Parameter
Continuously Operating Voltage
Start Threshold Voltage
Minimum Operating Voltage
Startup Current
Operating Supply Current
Internal Sink Current
I
DD-OLP
Off Voltage
V
DD
Over-Voltage Protection
V
DD
Over-Voltage Protection Debounce Time
Conditions
Min.
Typ.
Max. Units
22
V
V
V
µA
mA
µA
V
V
µs
14.5
8.5
V
DD-ON
– 0.16V
V
DD
=15V, GATE Open
V
TH-OLP
+0.1V
30
6.5
25
75
V
AC
=90V (V
DC
=120V),
V
DD
=0V
HV=500V,
V
DD
=V
DD-OFF
+1V
15.5
9.5
2.7
60
7.5
26
125
16.5
10.5
30
3.7
90
8.0
27
200
Supply Current Drawn from HV Pin
Leakage Current after Startup
2.0
3.5
1
5.0
20
mA
µA
Oscillator Section
Center Frequency
f
OSC
Frequency in Nominal Mode
Hopping Range
t
H
-
OP
f
OSC-G
f
DV
f
DT
Hopping Period
Green-Mode Frequency
Frequency Variation vs. V
DD
Deviation
Frequency Variation vs. Temperature
Deviation
V
DD
=11V to 22V
T
A
=-20 to 85C
18
±3.7
±4.2
4.4
22
26
5
5
±4.7
ms
KHz
%
%
62
65
68
KHz
Continued on the following page…
PWM Frequency
f
OSC
f
OSC-G
V
FB-G
V
FB-N
V
FB
Figure 5. V
FB
vs. PWM Frequency
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.3
www.fairchildsemi.com
5
京公网安备 11010802033920号
EEWORLD
