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Fairchild Semiconductor Electronic Components Datasheet

FAN6754 Datasheet

Highly Integrated Green-Mode PWM Controller

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September 2009
FAN6754
Highly Integrated Green-Mode PWM Controller
Brownout and Constant Power Limited by HV Pin
Features
ƒ High-Voltage Startup
ƒ AC Input Brownout Protection with Hysteresis
ƒ Low Operating Current: 1.7mA
ƒ Linearly Decreasing PWM Frequency to 22KHz
ƒ Frequency Hopping to Reduce EMI Emission
ƒ Fixed PWM Frequency: 65KHz
ƒ Peak-Current-Mode Control
ƒ Cycle-by-Cycle Current Limiting
ƒ Leading-Edge Blanking (LEB)
ƒ Internal Open-Loop Protection
ƒ GATE Output Maximum Voltage Clamp: 13V
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ VDD Over-Voltage Protection (OVP)
ƒ Programmable Over-Temperature Protection (OTP)
ƒ Internal Latch Circuit (OVP, OTP)
ƒ Open-Loop Protection (OLP); Restart for MR, Latch
for ML
www.DataShƒeet4BUu.cioltm-in 8ms Soft-Start Function
ƒ Constant Power Limit (Full AC Input Range)
ƒ Internal OTP Sensor with Hysteresis
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ Power Adapters
Description
The highly integrated FAN6754 PWM controller
provides several features to enhance the performance
of flyback converters. To minimize standby power
consumption, a proprietary green-mode function
provides off-time modulation to continuously decrease
the switching frequency under light-load conditions.
Under zero-load and very light-load conditions,
FAN6754 saves PWM pulses by entering deep burst
mode. This burst mode function enables the power
supply to meet international power conservation
requirements.
FAN6754 integrates a frequency-hopping function
internally to reduce EMI emission of a power supply
with minimum line filters. Built-in synchronized slope
compensation is accomplished by, proprietary internal
compensation for constant output power limit over
universal AC input range. Also, the gate output is
clamped at 13V to protect the external MOSFET from
over-voltage damage.
Other protection functions include AC input brownout
protection with hysteresis and VDD over-voltage
protection. For over-temperature protection, an external
NTC thermistor can be applied to sense the external
switcher’s temperature. When VDD OVP or OTP are
activated, an internal latch circuit is used to latch-off the
controller. The latch mode is reset when the VDD supply
is removed.
FAN6754 is available in an 8-pin SOP package.
Ordering Information
Part Number
Operating
Temperature Range
FAN6754MRMY
FAN6754MLMY
-40 to +105°C
-40 to +105°C
Eco
Status
RoHS
RoHS
Package
8-Pin, Small Outline Package (SOP)
8-Pin, Small Outline Package (SOP)
Packing Method
Tape & Reel
Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN6754 • Rev. 1.0.0
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN6754 Datasheet

Highly Integrated Green-Mode PWM Controller

No Preview Available !

Application Diagram
Internal Block Diagram
Figure 1. Typical Application
HV
4
Line Voltage
Sample Circuit
IHV
HV
Start up
Brownout Protection
OVP
OTP
OLP
Latch
Protection
Current Limit Compensation
www.DataSheet4U.com
VDD 7
UVLO
17.5V/10V
OSC
Internal
BIAS
Green
Mode
SQ
R
Soft-Start
Comparator
Current-Limit
Comparator
VDD-OVP
Debounce OVP
PWM
Comparator
RT 5
IRT
1.05V
0.7V
tD- OTP1
Counter
tD-OTP 2
Counter
OTP
OLP OLP
Delay
OLP
Comparator
1
GND
Figure 2. Functional Block Diagram
NC
3
Soft
Driver
8 GATE
Soft-Start
VLimit
Circuit
Blanking
6 SENSE
Slope
Compensation
3R
R
4.6V
5.2V
2 FB
© 2009 Fairchild Semiconductor Corporation
FAN6754 • Rev. 1.0.0
2
www.fairchildsemi.com


Part Number FAN6754
Description Highly Integrated Green-Mode PWM Controller
Maker Fairchild Semiconductor
Total Page 14 Pages
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